Patent Publication Number: US-2022214892-A1

Title: Foreground element display method and electronic device

Description:
This application is a National Stage of International Application No. PCT/CN2020/091275, filed on May 20, 2020, which claims priority to Chinese Patent Application No. 201910432840.8, filed on May 23, 2019, both of which are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The embodiments relate to the field of electronic technologies, and in particular, to a foreground element display method and an electronic device. 
     BACKGROUND 
     Currently, an electronic device plays an increasingly important role in people&#39;s life, and a user may obtain information such as time and a date by using the electronic device. When the user views the electronic device to obtain the information such as the time and the date, clear interface display is required to help the user quickly and accurately obtain the information. 
     An element displayed on an interface of the electronic device is affected by a background pattern. If a color of the element displayed on the interface of the electronic device is similar to a color of the background pattern, recognition of the element displayed on the interface is greatly affected. 
     SUMMARY 
     The embodiments provide a foreground element display method and an electronic device. The method can ensure that a foreground element has a clear display effect on an interface of the electronic device, ensure recognition of the foreground element, help a user obtain information, and improve user experience. 
     According to a first aspect, a foreground element display method is provided, applied to an electronic device. The method includes: displaying a first interface, where the first interface includes a first foreground element and a first background element, and the first foreground element has a first display effect; and receiving a first operation of a user, and displaying a second interface, where the second interface includes the first foreground element and a second background element; and when a similarity between the first foreground element and the second background element is greater than or equal to a first preset threshold, the first foreground element has a second display effect, and the first display effect is different from the second display effect; or when a similarity between the first foreground element and the second background element is less than a first preset threshold, the first foreground element has the first display effect. 
     For example, the first foreground element may be at least one of time, a date, weather information, an icon of an application, and a name of an application on the electronic device. A time element or a date element of the electronic device is used as an example. The first display effect may be a default display effect of the electronic device or a display effect that is set by the user, for example, a color, a font, or a size for displaying the time element or the date element. 
     For example, the first operation may be an operation of changing a wallpaper of the electronic device by the user. When the wallpaper of the electronic device is changed from the first background element to the second background element, the electronic device may detect the similarity between the first foreground element and the second background element. 
     For example, the second display effect may add a black shadow effect around the foreground element such as the time or the date. For example, when the similarity between the first foreground element and the second background element is greater than or equal to a first preset threshold, complementary color processing is performed on the first foreground element, where the complementary color processing is used to change a color of the first foreground element. In this way, a similarity between the color of the first foreground element and a color of the second background element is less than or equal to the first preset threshold. Then, blur processing is performed on the first foreground element on which the complementary color processing is performed, and the first foreground element on which the blur processing is performed and the first foreground element on which no processing is performed are fused, to obtain the first foreground element having the second display effect. 
     In a possible implementation, the fuzzing processing is used to obtain the first foreground elements with different blur degrees. For example, in a process of determining a blur degree, after the first foreground element and the first foreground elements on which blur processing with different blur degrees is performed are fused, the similarity between the first foreground element and the second background element is detected until the similarity between the first foreground element and the second background element is less than the first preset threshold. 
     In the foreground element display method described above, when the similarity between the foreground element and the background picture is high, the foreground element is extracted, the complementary color processing is performed on the extracted foreground element, and the blur processing is performed on the foreground element obtained after the complementary color processing. Then, the foreground element obtained after the blur processing and an original foreground element on which no processing is performed are superimposed, so that the foreground element has a clear display effect on the background picture, to ensure recognition of the foreground element and make the display effect natural. In addition, the background can be dynamically processed in real time following the change of the foreground element. In this way, an effect of the background picture is not affected. The display effect of the foreground element is natural, and the foreground element can be clearly displayed in any background pattern. 
     With reference to the first aspect, in some implementations of the first aspect, the method further includes: receiving a second operation of the user, and displaying a third interface, where the third interface includes a second foreground element and the first background element; and when a similarity between the second foreground element and the first background element is greater than or equal to the first preset threshold, the second foreground element has the second display effect; or when a similarity between the second foreground element and the first background element is less than the first preset threshold, the second foreground element has the first display effect. 
     For example, the second operation may be an operation of changing display of the foreground element of the electronic device by the user, for example, changing the font of the time element or the date element of the electronic device to the English font, that is, changing from the first foreground element to the second foreground element. When the wallpaper of the electronic device does not change, the electronic device may detect the similarity between the second foreground element and the first background element. 
     With reference to the first aspect and the foregoing implementations, in some implementations of the first aspect, the first background element and the second background element are wallpapers of the electronic device in a screen-locked state or wallpapers of the electronic device in a screen-unlocked state. 
     With reference to the first aspect and the foregoing implementations, in some implementations of the first aspect, the first foreground element and the second foreground element each are at least one of time, a date, weather information, an icon of an application, and a name of an application. 
     It should be understood that when the user changes the wallpaper of the electronic device, or changes display of a font or a language setting of a foreground element, such as time or a date, the electronic device starts detection to determine the similarity between the foreground element and the background pattern. Impact of the background pattern on the foreground element changes. In this case, the electronic device may start detection to re-determine a similarity between the foreground element and the background pattern. Only when the similarity between the foreground element and the background pattern is high, the foreground element display method provided in the embodiments is used. 
     In addition, when the electronic device is in a screen-locked state, the background pattern is a lock screen pattern. The lock screen pattern of the electronic device may be set to a continuously changing state. For example, if the user presses a power button once but does not unlock the electronic device, the lock screen pattern changes once. In this scenario, the electronic device may start detection by pressing the power button by the user, and determine the similarity between the foreground element and the background pattern. Alternatively, the user may trigger the change of the lock screen pattern in another manner. As long as a change of the background element is detected, the electronic device may start detection to determine the similarity between the foreground element and the background pattern. A manner of triggering the change of the lock screen pattern is not limited in the embodiments. 
     When the electronic device detects that the foreground element differs greatly from the background pattern, the electronic device does not need to use the method provided in this embodiment of the embodiments. For example, the electronic device may detect the similarity between a color of the foreground element and a color of the background pattern, or a contrast between a color of the foreground element and a color of the background pattern. When the similarity between the color of the foreground element and the color of the background pattern is greater than a specific threshold, or when the contrast between the color of the foreground element and the color of the background pattern is less than a specific threshold, it may be determined that the background pattern affects display of the foreground element, and the foreground element may be processed by using the foreground element processing method provided in the embodiments. 
     According to a second aspect, an electronic device is provided, including one or more processors, one or more memories, a plurality of applications, and one or more programs, where the one or more programs are stored in the memory, and when the one or more programs are executed by the processor, the electronic device is enabled to perform the following steps: displaying a first interface, where the first interface includes a first foreground element and a first background element, and the first foreground element has a first display effect; and receiving a first operation of a user, and displaying a second interface, where the second interface includes the first foreground element and a second background element; and when a similarity between the first foreground element and the second background element is greater than or equal to a first preset threshold, the first foreground element has a second display effect, and the first display effect is different from the second display effect; or when a similarity between the first foreground element and the second background element is less than a first preset threshold, the first foreground element has the first display effect. 
     With reference to the second aspect, in some implementations of the second aspect, when the one or more programs are executed by the processor, the electronic device is enabled to perform the following steps: receiving a second operation of the user, and displaying a third interface, where the third interface includes a second foreground element and the first background element; and when a similarity between the second foreground element and the first background element is greater than or equal to the first preset threshold, the second foreground element has the second display effect; or when a similarity between the second foreground element and the first background element is less than the first preset threshold, the second foreground element has the first display effect. 
     With reference to the second aspect and the foregoing implementations, in some implementations of the second aspect, the first background element and the second background element are wallpapers of the electronic device in a screen-locked state or wallpapers of the electronic device in a screen-unlocked state. 
     With reference to the second aspect and the foregoing implementations, in some implementations of the second aspect, the first foreground element and the second foreground element each are at least one of time, a date, weather, an icon of an application, and a name of an application. 
     According to a third aspect, the embodiments provide an apparatus. The apparatus is included in an electronic device, and the apparatus has a function of implementing behavior of the electronic device in the foregoing aspects and the possible implementations of the foregoing aspects. The function may be implemented by hardware, or may be implemented by hardware by executing corresponding software. The hardware or the software includes one or more modules or units corresponding to the foregoing function, for example, a display module or unit, or a processing module or unit. 
     According to a fourth aspect, the embodiments provide an electronic device, including a display screen, a camera, one or more processors, a memory, a plurality of applications, and one or more computer programs, where the display screen includes a touch-sensitive surface and a display. The one or more computer programs are stored in the memory, and the one or more computer programs include instructions. When the instructions are executed by the electronic device, the electronic device is enabled to perform the foreground element display method according to any possible implementation of any one of the foregoing aspects. 
     According to a fifth aspect, the embodiments provide an electronic device, including one or more processors and one or more memories. The one or more memories are coupled to the one or more processors, the one or more memories are configured to store computer program code, and the computer program code includes computer instructions. When the one or more processors execute the computer instructions, the electronic device is enabled to perform the foreground element display method according to any possible implementation of any one of the foregoing aspects. 
     According to a sixth aspect, the embodiments provide a computer storage medium, including computer instructions. When the computer instructions are run on an electronic device, the electronic device is enabled to perform the foreground element display method according to any possible implementation of any one of the foregoing aspects. 
     According to a seventh aspect, the embodiments provide a computer program product. When the computer program product is run on an electronic device, the electronic device is enabled to perform the foreground element display method according to any possible implementation of any one of the foregoing aspects. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic diagram of a hardware structure of an electronic device according to an embodiment; 
         FIG. 2  is a schematic diagram of a software structure of an electronic device according to an embodiment; 
         FIG. 3( a ) ,  FIG. 3( b ) ,  FIG. 3( c ) , and  FIG. 3( d )  are a schematic diagram of an example of displaying a foreground element of an electronic device according to an embodiment; 
         FIG. 4( a ) ,  FIG. 4( b ) ,  FIG. 4( c ) , and  FIG. 4( d )  are a schematic diagram of several scenario examples according to an embodiment; 
         FIG. 5( a ) ,  FIG. 5( b ) ,  FIG. 5( c ) , and  FIG. 5( d )  are a schematic diagram of an example of a foreground element processing process according to an embodiment; 
         FIG. 6( a ) ,  FIG. 6( b ) ,  FIG. 6( c ) , and  FIG. 6( d )  are a schematic diagram of an example of foreground elements with different blur degrees according to an embodiment; 
         FIG. 7( a ) ,  FIG. 7( b ) ,  FIG. 7( c ) , and  FIG. 7( d )  are a schematic diagram of another example of a foreground element processing process according to an embodiment; 
         FIG. 8( a ) ,  FIG. 8( b ) ,  FIG. 8( c ) , and  FIG. 8( d )  are a schematic diagram of another example of a foreground element processing process according to an embodiment; 
         FIG. 9( a ) ,  FIG. 9( b ) ,  FIG. 9( c ) , and  FIG. 9( d )  are a schematic diagram of another example of a foreground element processing process according to an embodiment; 
         FIG. 10  is a schematic flowchart of a foreground element display method according to an embodiment; and 
         FIG. 11  is a schematic diagram of composition of an example of an electronic device according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     The following describes the solutions in the embodiments with reference to the accompanying drawings. 
     In the descriptions of the embodiments, unless otherwise specified, “/” means “or”. For example, A/B may represent A or B. In the embodiments, “and/or” describes only an association for describing associated objects and represents that three relationships may exist. For example, A and/or B may represent the following three cases: only A exists, both A and B exist, and only B exists. In addition, in the descriptions in the embodiments, “a plurality of” means two or more than two. 
     The following terms “first” and “second” are only intended for a purpose of description, and shall not be understood as an indication or implication of relative importance or implicit indication of a quantity of indicated technical features. Therefore, a feature limited by “first” or “second” may explicitly or implicitly include one or more features. In the descriptions of the embodiments, unless otherwise specified, “a plurality of” means two or more than two. 
     As described in the Background, an element displayed on an interface of an electronic device is affected by a background pattern. Particularly, when a color of the element displayed on the interface of the electronic device is similar to a color of the background pattern, recognition of the element displayed on the interface is greatly affected. It is inconvenient for a user to quickly and accurately obtain information included in the element on the interface. 
     An embodiment provides a foreground element display method, which may be applied to an electronic device. When a color of an element displayed on an interface of the electronic device is similar to a color of a background pattern, a series of processing processes may be performed on the element displayed on the interface, so that the element displayed on the interface has a natural display effect, and an effect of the background picture is not affected. This ensures that the element displayed on the interface can be clearly displayed in any background pattern. 
     The foreground element display method provided in this embodiment may be applied to electronic devices such as a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an augmented reality (AR)/virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, and a personal digital assistant (PDA). A specific type of the electronic device is not limited in this embodiment. 
     For example,  FIG. 1  is a schematic diagram of a structure of an electronic device  100 . The electronic device  100  may include a processor  110 , an external memory interface  120 , an internal memory  121 , a universal serial bus (USB) port  130 , a charging management module  140 , a power management module  141 , a battery  142 , an antenna  1 , an antenna  2 , a mobile communications module  150 , a wireless communications module  160 , an audio module  170 , a speaker  170 A, a receiver  170 B, a microphone  170 C, a headset jack  170 D, a sensor module  180 , a button  190 , a motor  191 , an indicator  192 , a camera  193 , a display screen  194 , a subscriber identity module (SIM) card interface  195 , and the like. The sensor module  180  may include a pressure sensor  180 A, a gyro sensor  180 B, a barometric pressure sensor  180 C, a magnetic sensor  180 D, an acceleration sensor  180 E, a distance sensor  180 F, an optical proximity sensor  180 G, a fingerprint sensor  180 H, a temperature sensor  180 J, a touch sensor  180 K, an ambient light sensor  180 L, a bone conduction sensor  180 M, and the like. 
     It can be understood that the structure shown in this embodiment does not constitute a specific limitation on the electronic device  100 . In some other embodiments, the electronic device  100  may include more or fewer components than those shown in the figure, or some components may be combined, or some components may be split, or different component arrangements may be used. The components shown in the figure may be implemented by hardware, software, or a combination of software and hardware. 
     The processor  110  may include one or more processing units. For example, the processor  110  may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and/or a neural-network processing unit (NPU). Different processing units may be independent components, or may be integrated into one or more processors. 
     The controller may be a nerve center and a command center of the electronic device  100 . The controller may generate an operation control signal based on instruction operation code and a time sequence signal, to complete control of instruction reading and instruction execution. 
     The memory may be further disposed in the processor  110 , and is configured to store instructions and data. In some embodiments, the memory in the processor  110  is a cache. The memory may store instructions or data just used or cyclically used by the processor  110 . If the processor  110  needs to use the instructions or the data again, the processor  110  may directly invoke the instructions or the data from the memory. Repeated access is avoided, and waiting time of the processor  110  is reduced, and therefore system efficiency is improved. 
     In some embodiments, the processor  110  may include one or more interfaces. The interface may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input/output (GPIO) interface, a SIM interface, a USB port, and/or the like. 
     For example, in the embodiments, the processor detects a similarity between a foreground element and a background picture by obtaining information about the foreground element and the background picture, and when the similarity between the foreground element and the background picture is greater than or equal to a preset threshold, performs a series of processing operations on the foreground element. Therefore, the foreground element can have a clear display effect on the background picture, and the user can conveniently obtain information about the foreground element. 
     The I2C interface is a bidirectional synchronous serial bus and includes a serial data line (SDA) and a serial clock line ( ). In some embodiments, the processor  110  may include a plurality of groups of I2C buses. The processor  110  may be separately coupled to the touch sensor  180 K, a charger, a flash, the camera  193 , and the like through different I2C bus interfaces. For example, the processor  110  may be coupled to the touch sensor  180 K through the I2C interface, so that the processor  110  communicates with the touch sensor  180 K through the I2C bus interface, to implement a touch function of the electronic device  100 . 
     The I2S interface may be used for audio communication. In some embodiments, the processor  110  may include a plurality of groups of I2S buses. The processor  110  may be coupled to the audio module  170  by using an I2S bus, to implement communication between the processor  110  and the audio module  170 . In some embodiments, the audio module  170  may transmit an audio signal to the wireless communications module  160  through the I2S interface, to implement a function of answering a call by using a Bluetooth headset. 
     The PCM interface may also be used for audio communication to sample, quantize, and encode an analog signal. In some embodiments, the audio module  170  and the wireless communications module  160  may be coupled through a PCM bus interface. In some embodiments, the audio module  170  may also transmit an audio signal to the wireless communications module  160  through the PCM interface, to implement a function of answering a call by using the Bluetooth headset. Both the I2S interface and the PCM interface may be used for audio communication. 
     The UART interface is a universal serial data bus, and is used for asynchronous communication. The bus may be a bidirectional communications bus, and converts to-be-transmitted data between serial communication and parallel communication. In some embodiments, the UART interface is usually configured to connect the processor  110  to the wireless communications module  160 . For example, the processor  110  communicates with a Bluetooth module in the wireless communications module  160  through the UART interface, to implement a Bluetooth function. In some embodiments, the audio module  170  may transmit an audio signal to the wireless communications module  160  through the UART interface, to implement a function of playing music through the Bluetooth headset. 
     The MIPI interface may be configured to connect the processor  110  to a peripheral component such as the display screen  194  or the camera  193 . The MIPI interface includes a camera serial interface (CSI), a display serial interface (DSI), or the like. In some embodiments, the processor  110  communicates with the camera  193  through the CSI interface, to implement a photographing function of the electronic device  100 . The processor  110  communicates with the display screen  194  through the DSI interface, to implement a display function of the electronic device  100 . 
     The GPIO interface may be configured by using software. The GPIO interface may be configured as a control signal or a data signal. In some embodiments, the GPIO interface may be configured to connect the processor  110  to the camera  193 , the display screen  194 , the wireless communications module  160 , the audio module  170 , the sensor module  180 , and the like. The GPIO interface may alternatively be configured as the I2C interface, the I2S interface, the UART interface, the MIPI interface, or the like. 
     The USB port  130  is a port that complies with a USB standard specification and may be a mini USB port, a micro USB port, a USB Type C port, or the like. The USB port  130  may be configured to connect to the charger to charge the electronic device  100 , or may be used for data transmission between the electronic device  100  and a peripheral device, or may be configured to connect to a headset to play audio through the headset. This interface may be further configured to connect to another electronic device such as an AR device. 
     It can be understood that an interface connection relationship between modules illustrated in this embodiment is merely an example for description and does not constitute a limitation on the structure of the electronic device  100 . In some other embodiments, the electronic device  100  may alternatively use an interface connection manner different from that in the foregoing embodiment, or a combination of a plurality of interface connection manners. 
     The charging management module  140  is configured to receive a charging input from the charger. The charger may be a wireless charger or a wired charger. In some embodiments of wired charging, the charging management module  140  may receive a charging input from a wired charger through the USB port  130 . In some embodiments of wireless charging, the charging management module  140  may receive a wireless charging input by using a wireless charging coil of the electronic device  100 . The charging management module  140  supplies power to the electronic device by using the power management module  141  while charging the battery  142 . 
     The power management module  141  is configured to connect the battery  142  and the charging management module  140  to the processor  110 . The power management module  141  receives an input from the battery  142  and/or the charging management module  140 , and supplies power to the processor  110 , the internal memory  121 , an external memory, the display screen  194 , the camera  193 , the wireless communications module  160 , and the like. The power management module  141  may be further configured to monitor parameters such as a battery capacity, a battery cycle count, and a battery health status (electric leakage or impedance). In some other embodiments, the power management module  141  may alternatively be disposed in the processor  110 . In some other embodiments, the power management module  141  and the charging management module  140  may alternatively be disposed in a same device. 
     A wireless communication function of the electronic device  100  may be implemented by using the antenna  1 , the antenna  2 , the mobile communications module  150 , the wireless communications module  160 , the modem processor, the baseband processor, and the like. 
     The antenna  1  and the antenna  2  are configured to transmit and receive an electromagnetic wave signal. Each antenna in the electronic device  100  may be configured to cover one or more communication frequency bands. Different antennas may further be multiplexed to improve antenna utilization. For example, the antenna  1  may be multiplexed as a diversity antenna of a wireless local area network. In some other embodiments, an antenna may be used in combination with a tuning switch. 
     The mobile communications module  150  can provide a solution, applied to the electronic device  100 , to wireless communication including 2G/3G/4G/5G and the like. The mobile communications module  150  may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), and the like. The mobile communications module  150  may receive an electromagnetic wave by using the antenna  1 , perform processing such as filtering and amplification on the received electromagnetic wave, and transmit the electromagnetic wave to the modem processor for demodulation. The mobile communications module  150  may further amplify a signal modulated by the modem processor, and convert the signal into an electromagnetic wave for radiation by using the antenna  1 . In some embodiments, at least some function modules of the mobile communications module  150  may be disposed in the processor  110 . In some embodiments, at least some function modules of the mobile communications module  150  and at least some modules of the processor  110  may be disposed in a same device. 
     The modem processor may include a modulator and a demodulator. The modulator is configured to modulate a to-be-sent low-frequency baseband signal into a medium-high frequency signal. The demodulator is configured to demodulate a received electromagnetic wave signal into a low-frequency baseband signal. Then, the demodulator transmits the low-frequency baseband signal obtained through demodulation to the baseband processor for processing. After being processed by the baseband processor, the low-frequency baseband signal is transmitted to the application processor. The application processor outputs a sound signal through an audio device (which is not limited to the speaker  170 A, the receiver  170 B, or the like), or displays an image or a video through the display screen  194 . In some embodiments, the modem processor may be an independent component. In some other embodiments, the modem processor may be independent of the processor  110 , and is disposed in a same device as the mobile communications module  150  or another function module. 
     The wireless communications module  160  may provide wireless communication solutions, applied to the electronic device  100 , for example, wireless local area network (WLAN) (such as a wireless fidelity (Wi-Fi) network), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), and infrared (IR) technologies. The wireless communications module  160  may be one or more components integrating at least one communications processor module. The wireless communications module  160  receives an electromagnetic wave by using the antenna  2 , performs frequency modulation and filtering on an electromagnetic wave signal, and sends a processed signal to the processor  110 . The wireless communications module  160  may further receive a to-be-sent signal from the processor  110 , perform frequency modulation and amplification on the signal, convert the signal into an electromagnetic wave by using the antenna  2 , and radiate the electromagnetic wave by using the antenna  2 . 
     In some embodiments, the antenna  1  of the electronic device  100  is coupled to the mobile communications module  150 , and the antenna  2  is coupled to the wireless communications module  160 , so that the electronic device  100  can communicate with a network and another device by using a wireless communications technology. The wireless communications technology may include a global system for mobile communications (GSM), a general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (time-division code division multiple access, TD-CDMA), long term evolution (LTE), BT, a GNSS, a WLAN, NFC, FM, an IR technology, and/or the like. The GNSS may include a global positioning system (GPS), a global navigation satellite system (GLONASS), a BeiDou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS), and/or satellite based augmentation systems (SBAS). 
     The electronic device  100  implements a display function by using the GPU, the display screen  194 , the application processor, and the like. The GPU is a microprocessor for image processing, and is connected to the display screen  194  and the application processor. The GPU is configured to perform mathematical and geometric calculation, and render an image. The processor  110  may include one or more GPUs that execute program instructions to generate or change display information. 
     The display screen  194  is configured to display an image, a video, or the like. The display screen  194  includes a display panel. The display panel may use a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED), a flex light-emitting diode (FLED), a mini-LED, a micro-LED, a micro-OLED, quantum dot light-emitting diodes (QLED), or the like. In some embodiments, the electronic device  100  may include one or N display screens  194 , where N is a positive integer greater than 1. 
     For example, in the embodiments, the display screen may be configured to display the background picture and the foreground element. 
     The electronic device  100  can implement the photographing function by using the ISP, the camera  193 , the video codec, the GPU, the display screen  194 , the application processor, and the like. 
     The ISP is configured to process data fed back by the camera  193 . For example, during photographing, a shutter is pressed, light is transmitted to a photosensitive element of the camera through a lens, an optical signal is converted into an electrical signal, and the photosensitive element of the camera transmits the electrical signal to the ISP for processing, to convert the electrical signal into a visible image. The ISP may further perform algorithm optimization on noise, brightness, and complexion of the image. The ISP may further optimize parameters such as exposure and a color temperature of a photographing scenario. In some embodiments, the ISP may be disposed in the camera  193 . 
     The camera  193  is configured to capture a static image or a video. An optical image of an object is generated through the lens, and is projected onto the photosensitive element. The photosensitive element may be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) photoelectric transistor. The photosensitive element converts an optical signal into an electrical signal, and then transmits the electrical signal to the ISP to convert the electrical signal into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into a standard image signal in an RGB format, a YUV format, or the like. In some embodiments, the electronic device  100  may include one or N cameras  193 , where N is a positive integer greater than 1. 
     For example, in the foreground element display method provided in the embodiments, the camera may collect the moon and the background picture and display the collected images on a preview interface. The photosensitive element converts a collected optical signal into an electrical signal, and then transmits the electrical signal to the ISP to convert the electrical signal into a digital image signal. The ISP outputs the digital image signal to the DSP for related image processing. 
     The digital signal processor is configured to process a digital signal, and may process another digital signal in addition to the digital image signal. For example, when the electronic device  100  selects a frequency, the digital signal processor is configured to perform Fourier transform and the like on frequency energy. 
     The video codec is configured to compress or decompress a digital video. The electronic device  100  may support one or more types of video codecs. In this way, the electronic device  100  can play or record videos in a plurality of encoding formats, for example, moving picture experts group (MPEG)-1, MPEG-2, MPEG-3, and MPEG-4. 
     The NPU is a neural network (NN) computing processor. The NPU quickly processes input information with reference to a structure of a biological neural network, for example, with reference to a transfer mode between human brain neurons, and may further continuously perform self-learning. Applications such as intelligent cognition of the electronic device  100 , for example, image recognition, facial recognition, speech recognition, and text understanding, can be implemented by using the NPU. 
     The external memory interface  120  may be configured to connect to an external storage card, for example, a micro SD card, to extend a storage capability of the electronic device  100 . The external storage card communicates with the processor  110  through the external memory interface  120 , to implement a data storage function. For example, files such as music and a video are stored in the external storage card. 
     The internal memory  121  may be configured to store computer-executable program code. The executable program code includes instructions. The processor  110  runs the instructions stored in the internal memory  121  to perform various function applications of the electronic device  100  and process data. The internal memory  121  may include a program storage area and a data storage area. The program storage area may store an operating system, an application required by at least one function (for example, a sound playing function or an image playing function), and the like. The data storage area may store data (such as audio data and a phone book) and the like created when the electronic device  100  is used. In addition, the internal memory  121  may include a high-speed random access memory, and may further include a nonvolatile memory, for example, at least one magnetic disk storage device, a flash memory device, or a universal flash storage (UFS). 
     The electronic device  100  may implement audio functions by using the audio module  170 , the speaker  170 A, the receiver  170 B, the microphone  170 C, the headset jack  170 D, the application processor, and the like, for example, implement a music playback function and a recording function. 
     The audio module  170  is configured to convert digital audio information into an analog audio signal output, and is further configured to convert an analog audio input into a digital audio signal. The audio module  170  may further be configured to code and decode an audio signal. In some embodiments, the audio module  170  may be disposed in the processor  110 , or some function modules of the audio module  170  are disposed in the processor  110 . 
     The speaker  170 A, also referred to as a “horn”, is configured to convert an audio electrical signal into a sound signal. The electronic device  100  may be configured to listen to music or answer a hands-free call by using the speaker  170 A. 
     The receiver  170 B, also referred to as an “earpiece”, is configured to convert an audio electrical signal into a sound signal. When a call is answered or voice information is received by using the electronic device  100 , the receiver  170 B may be put close to a human ear to receive a voice. 
     The microphone  170 C, also referred to as a “mike” or a “voice tube”, is configured to convert a sound signal into an electrical signal. When making a call or sending voice information, a user may make a sound near the microphone  170 C through the mouth of the user, to input a sound signal to the microphone  170 C. At least one microphone  170 C may be disposed in the electronic device  100 . In some other embodiments, two microphones  170 C may be disposed in the electronic device  100 , to implement a noise reduction function, in addition to collecting a sound signal. In some other embodiments, three, four, or more microphones  170 C may alternatively be disposed in the electronic device  100 , to collect a sound signal and reduce noise. The microphones may further identify a sound source, to implement a directional recording function, and the like. 
     The headset jack  170 D is configured to connect to a wired headset. The headset jack  170 D may be the USB port  130 , or may be a 3.5 mm open mobile electronic device platform (OMTP) standard interface, or a cellular telecommunications industry association of the USA (CTIA) standard interface. 
     The pressure sensor  180 A is configured to sense a pressure signal, and can convert the pressure signal into an electrical signal. In some embodiments, the pressure sensor  180 A may be disposed on the display screen  194 . There are a plurality of types of pressure sensors  180 A, for example, a resistive pressure sensor, an inductive pressure sensor, and a capacitive pressure sensor. The capacitive pressure sensor may include at least two parallel plates made of conductive materials. When a force is applied to the pressure sensor  180 A, capacitance between electrodes changes. The electronic device  100  determines pressure intensity based on a change of the capacitance. When a touch operation is performed on the display screen  194 , the electronic device  100  detects intensity of the touch operation by using the pressure sensor  180 A. The electronic device  100  may also calculate a touch location based on a detection signal of the pressure sensor  180 A. In some embodiments, touch operations that are performed at a same touch location but have different touch operation intensities may correspond to different operation instructions. For example, when a touch operation whose touch operation intensity is less than a first pressure threshold is performed on an SMS message application icon, an instruction for viewing an SMS message is executed. When a touch operation whose touch operation intensity is greater than or equal to the first pressure threshold is performed on the SMS message application icon, an instruction for creating an SMS message is executed. 
     The gyro sensor  180 B may be configured to determine a motion posture of the electronic device  100 . In some embodiments, an angular velocity of the electronic device  100  around three axes (namely, axes x, y, and z) may be determined by using the gyro sensor  180 B. The gyro sensor  180 B may be configured to perform image stabilization during photographing. For example, when the shutter is pressed, the gyro sensor  180 B detects a shaking angle of the electronic device  100 , calculates, based on the angle, a distance for which a lens module needs to compensate, and allows the lens to eliminate the shaking of the electronic device  100  through reverse motion, to implement image stabilization. The gyro sensor  180 B may also be used in navigation and motion sensing game scenarios. 
     The barometric pressure sensor  180 C is configured to measure barometric pressure. In some embodiments, the electronic device  100  calculates an altitude based on a barometric pressure value measured by the barometric pressure sensor  180 C, to assist in positioning and navigation. 
     The magnetic sensor  180 D includes a Hall sensor. The electronic device  100  may detect opening and closing of a flip cover by using the magnetic sensor  180 D. In some embodiments, when the electronic device  100  is a clamshell phone, the electronic device  100  may detect opening and closing of a flip cover by using the magnetic sensor  180 D. Further, a feature such as automatic unlocking upon opening of the flip cover is set based on a detected opening or closing state of the leather case or a detected opening or closing state of the flip cover. 
     The acceleration sensor  180 E may detect magnitude of accelerations of the electronic device  100  in all directions (usually on three axes), and may detect magnitude and a direction of gravity when the electronic device  100  is still. The acceleration sensor  180 E may further be configured to identify a posture of the electronic device, and is applied to switching between a landscape mode and a portrait mode, and applications such as a pedometer. 
     The distance sensor  180 F is configured to measure a distance. The electronic device  100  may measure a distance by using infrared or laser. In some embodiments, in a photographing scenario, the electronic device  100  may measure a distance by using the distance sensor  180 F, to implement fast focusing. 
     For example, in the foreground element display method provided in the embodiments, in a photographing preview phase, a distance may be measured in an auto-focus process based on the distance sensor  180 F, to implement fast auto-focus. 
     The optical proximity sensor  180 G may include, for example, a light-emitting diode (LED) and an optical detector, such as a photodiode. The light-emitting diode may be an infrared light-emitting diode. The electronic device  100  emits infrared light by using the light-emitting diode. The electronic device  100  detects infrared reflected light from a nearby object by using the photodiode. When sufficient reflected light is detected, the electronic device  100  may determine that there is an object near the electronic device  100 . When insufficient reflected light is detected, the electronic device  100  may determine that there is no object near the electronic device  100 . The electronic device  100  may detect, by using the optical proximity sensor  180 G, that the user holds the electronic device  100  close to an ear for a call, to automatically turn off a screen for power saving. The optical proximity sensor  180 G may also be configured to automatically unlock and lock a screen in a leather case mode and a pocket mode. 
     The ambient light sensor  180 L is configured to sense ambient light brightness. The electronic device  100  may adaptively adjust brightness of the display screen  194  based on the sensed ambient light brightness. The ambient light sensor  180 L may also be configured to automatically adjust white balance during shooting. The ambient light sensor  180 L may further cooperate with the optical proximity sensor  180 G to detect whether the electronic device  100  is in a pocket, to prevent an accidental touch. 
     The fingerprint sensor  180 H is configured to collect a fingerprint. The electronic device  100  may implement fingerprint-based unlocking, application access locking, fingerprint-based shooting, fingerprint-based call answering, and the like by using a feature of the collected fingerprint. 
     The temperature sensor  180 J is configured to detect a temperature. In some embodiments, the electronic device  100  executes a temperature processing policy based on the temperature detected by the temperature sensor  180 J. For example, when the temperature reported by the temperature sensor  180 J exceeds a threshold, the electronic device  100  degrades performance of a processor near the temperature sensor  180 J, to reduce power consumption and implement thermal protection. In some other embodiments, when the temperature is lower than another threshold, the electronic device  100  heats up the battery  142 , to avoid abnormal shutdown of the electronic device  100  due to a low temperature. In some other embodiments, when the temperature is lower than still another threshold, the electronic device  100  boosts an output voltage of the battery  142 , to avoid abnormal shutdown due to a low temperature. 
     The touch sensor  180 K is also referred to as a “touch panel”. The touch sensor  180 K may be disposed on the display screen  194 , and the touch sensor  180 K and the display screen  194  form a touchscreen that is also referred to as a “touch control screen”. The touch sensor  180 K is configured to detect a touch operation performed on or near the touch sensor  180 K. The touch sensor may transfer the detected touch operation to the application processor, to determine a type of a touch event. A visual output related to the touch operation may be provided by using the display screen  194 . In some other embodiments, the touch sensor  180 K may alternatively be disposed on a surface of the electronic device  100 , and is located at a position different from that of the display screen  194 . 
     The bone conduction sensor  180 M may obtain a vibration signal. In some embodiments, the bone conduction sensor  180 M may obtain a vibration signal of a vibration bone of a human vocal-cord part. The bone conduction sensor  180 M may also be in contact with a human pulse to receive a blood pressure beating signal. In some embodiments, the bone conduction sensor  180 M may alternatively be disposed in a headset to form a bone conduction headset. The audio module  170  may obtain a voice signal through parsing based on the vibration signal that is of the vibration bone of the vocal-cord part and that is obtained by the bone conduction sensor  180 M, to implement a voice function. The application processor may parse heart rate information based on the blood pressure beating signal obtained by the bone conduction sensor  180 M, to implement a heart rate detection function. 
     The button  190  includes a power button, a volume button, and the like. The button  190  may be a mechanical button, or may be a touch button. The electronic device  100  may receive a button input, and generate a button signal input related to user settings and function control of the electronic device  100 . 
     The motor  191  may generate a vibration prompt. The motor  191  may be configured to produce an incoming call vibration prompt and a touch vibration feedback. For example, touch operations performed on different applications (for example, a photographing application and an audio playing application) may correspond to different vibration feedback effects. The motor  191  may also correspond to different vibration feedback effects for touch operations performed on different areas of the display screen  194 . Different application scenarios (for example, time reminding, information receiving, an alarm clock, and a game) may also correspond to different vibration feedback effects. A touch vibration feedback effect may further be customized. 
     The indicator  192  may be an indicator light, and may be configured to indicate a charging status and a power change, or may be configured to indicate a message, a missed call, a notification, and the like. 
     The SIM card interface  195  is configured to connect to a SIM card. The SIM card may be inserted in the SIM card interface  195  or removed from the SIM card interface  195 , to implement contact with or separation from the electronic device  100 . The electronic device  100  may support one or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface  195  can support a nano-SIM card, a micro-SIM card, a SIM card, and the like. A plurality of cards can be simultaneously inserted into the same SIM card interface  195 . The plurality of cards may be of a same type or of different types. The SIM card interface  195  may also be compatible with different types of SIM cards. The SIM card interface  195  may also be compatible with an external storage card. The electronic device  100  interacts with a network through the SIM card, to implement functions such as calling and data communications. In some embodiments, the electronic device  100  uses an eSIM, namely, an embedded SIM card. The eSIM card may be embedded in the electronic device  100 , and cannot be separated from the electronic device  100 . 
     A software system of the electronic device  100  may use a hierarchical architecture, an event-driven architecture, a microkernel architecture, a microservice architecture, or a cloud architecture. In the embodiments, an Android system with a layered architecture is used as an example to describe a software structure of the electronic device  100 . 
       FIG. 2  is a block diagram of the software structure of the electronic device  100  according to this embodiment. In a hierarchical architecture, software is divided into several layers, and each layer has a clear role and responsibility. The layers communicate with each other through a software interface. In some embodiments, an Android system is divided into four layers, namely, an application layer, an application framework layer, an Android runtime, a system library, and a kernel layer from top to bottom. The application layer may include a series of application packages. 
     As shown in  FIG. 2 , the application packages may include applications such as “camera”, “gallery”, “calendar”, “phone”, “map”, “navigation”, “WLAN”, “Bluetooth”, “music”, “videos”, and “messages”. 
     The application framework layer provides an application programming interface (API) and a programming framework for an application at the application layer. The application framework layer includes some predefined functions. 
     For example, in the embodiments, an algorithm for performing a series of processing on the obtained foreground element may be included at the application framework layer. 
     As shown in  FIG. 2 , the application framework layer may include a window manager, a content provider, a view system, a phone manager, a resource manager, a notification manager, and the like. 
     The window manager is configured to manage a window program. The window manager may obtain a size of the display screen, determine whether there is a status bar, perform screen locking, take a screenshot, and the like. 
     The content provider is configured to store and obtain data, and enable the data to be accessed by an application. The data may include a video, an image, audio, dialed and answered calls, browsing history, a bookmark, a phone book, and the like. 
     For example, in the embodiments, a content controller may obtain information about the foreground element and the background picture in a preview interface in real time and display the processed foreground element in the interface. 
     The view system includes a visual control, for example, a control for displaying text or a control for displaying a picture. The view system may be configured to construct an application. A display interface may include one or more views. For example, a display interface including an SMS message notification icon may include a text display view and an image display view. 
     The phone manager is configured to provide a communication function of the electronic device  100 , for example, management of a call status (including answering, declining, and the like). 
     The resource manager provides, for an application, various resources such as a localized character string, an icon, a picture, a layout file, and a video file. 
     The notification manager enables an application to display notification information in the status bar, and may be used to transmit a notification-type message. The displayed information may automatically disappear after a short pause without user interaction. For example, the notification manager is configured to notify download completion, give a message notification, and the like. The notification manager may alternatively be a notification that appears in a top status bar of the system in a form of a graph or a scroll bar text, for example, a notification of an application running on the background or a notification that appears on the screen in a form of a dialog window. For example, text information is prompted in the status bar, a prompt tone is produced, the electronic device vibrates, or an indicator light blinks. 
     The Android runtime includes a kernel library and a virtual machine. The Android runtime is responsible for scheduling and management of the Android system. 
     The kernel library includes two parts: One part is a performance function that the Java language needs to schedule, and the other part is a kernel library of Android. 
     The application layer and the application framework layer run in the virtual machine. The virtual machine executes Java files at the application layer and the application framework layer as binary files. The virtual machine is configured to perform functions such as object life cycle management, stack management, thread management, security and exception management, and garbage collection. 
     The system library may include a plurality of function modules, for example, a surface manager, a media library, a three-dimensional graphics processing library (for example, OpenGL ES), and a 2D graphics engine (for example, SGL). 
     The surface manager is configured to manage a display subsystem, and provides fusion of 2D and 3D layers for a plurality of applications. 
     The media library supports playback and recording of a plurality of common audio and video formats, a static image file, and the like. The media library may support a plurality of audio and video encoding formats such as MPEG-4, H.264, MP3, AAC, AMR, JPG, and PNG. 
     The three-dimensional graphics processing library is used to implement three-dimensional graphics drawing, image rendering, compositing, layer processing, and the like. 
     The 2D graphics engine is a drawing engine for 2D drawing. 
     The kernel layer is a layer between hardware and software. The kernel layer includes at least a display driver, a camera driver, an audio driver, and a sensor driver. 
     For ease of understanding, in the following embodiments, the electronic device having the structures shown in  FIG. 1  and  FIG. 2  is used as an example to describe in detail, with reference to the accompanying drawings and application scenarios, the foreground element display method provided in the embodiments. 
     An element displayed on an interface of the electronic device is affected by a background pattern on the interface. If a color of the element displayed on the interface of the electronic device is similar to a color of the background pattern, recognition of the element displayed on the interface is greatly affected. 
     It should be understood that the element displayed on the interface of the electronic device may include one or more of time, a date, a day, and weather; or the element displayed on the interface may be a widget display box that includes time, a date, a day, weather, and a trip; or the element displayed on the interface may include names of icons of various third-party applications, for example, icons or names of applications such as Alipay and WeChat; or the element displayed on the interface may include an icon, a name, and the like of a folder created by a user. This is not limited in the embodiments. In the embodiments, the element displayed on the interface is referred to as a “foreground element”, and a pattern in a wallpaper (for example, a home screen wallpaper in a screen-unlocked state or a lock screen wallpaper in a screen-locked state) of the electronic device is referred to as a “background pattern”. The time, the date, the day, or the like displayed on the interface of the electronic device is used as the foreground element to describe the foreground element display method. 
       FIG. 3( a ) ,  FIG. 3( b ) ,  FIG. 3( c ) , and  FIG. 3( d )  are a schematic diagram of an example of displaying a foreground element of an electronic device. As shown in  FIG. 3( a ) , on a display interface of the electronic device, a background pattern  301  is a pattern in a background wallpaper of the display interface, and a foreground element  302  is time, a date, a day, or the like that is displayed on the background pattern in the display interface. 
     As shown in  FIG. 3( a ) , when a color of the background pattern  301  and a color of the foreground element  302  are similar, recognition of the foreground element  302  is affected. When a user views information such as time, a date, a day, or weather, because the color of the background pattern  301  and the color of the foreground element  302  are similar, the user cannot clearly see or accurately obtain required information; or a pattern in the background pattern  301  may affect a number, a character, or the like in the foreground element  302 , and consequently, the user incorrectly reads the time, the date, the day, or the like. 
     To improve recognition of the foreground element, the following methods may be used. 
     In an implementation, a projection is added at the bottom of the foreground element, to improve the recognition of the foreground element. As shown in  FIG. 3( b ) , a projection is added at the bottom of the time, the date, or the day displayed on the interface, and the recognition is enhanced. However, the projection is stiff, and consequently, display of the time, the date, or the day is blurred, and a visual effect is poor. 
     In another implementation, complementary color processing is performed on the foreground element. As shown in  FIG. 3( c ) , the time, the date, or the day displayed on the original interface is in black font, and the foreground element such as the time, the date, or the day is displayed in white font after complementary color processing is performed. This method is applicable to a case in which a color in the background pattern is relatively pure. If the background pattern is a black-and-white pattern, because the foreground element is displayed as black, and is displayed as white after complementary color processing is performed, the foreground element may still be indistinguishable from the background pattern, and there is still a problem in recognition. 
     It should be understood that, complementary color processing may be completed by a system of a terminal device in real time, for example, when the color of the foreground element and the color of the background pattern are similar, complementary color processing is performed on the foreground element. Alternatively, complementary color processing is completed in advance by a vendor of a third-party application that provides the foreground element, the foreground element is stored in a terminal device in a specific form, and when the color of the foreground element and the color of the background pattern are similar, the terminal device invokes the foreground element stored in the terminal device for display. This is not limited in the embodiments. 
     In another implementation, the background pattern is processed, to enhance the recognition of the foreground element, for example, blur processing may be performed on the background pattern. As shown in  FIG. 3( d ) , blur processing on the background pattern may improve the recognition of the foreground element. However, in actual use, after the background pattern is blurred, the user cannot clearly see the actual background pattern. When the background pattern after the blur processing is a lock screen wallpaper of the electronic device, if the user prefers to present a picture effect by using the lock screen wallpaper, this method cannot achieve an effect of enhancing the recognition of the foreground element. 
     In another implementation, a mask layer is added between the background pattern and the foreground element, to enhance the recognition of the foreground element. For example, a translucent and gradually-changed white or black mask layer may be added between the foreground element and the background pattern, so that the recognition of the foreground element can be enhanced without affecting the foreground element. However, this method is similar to the method in  FIG. 3( d ) , and both affect display of the background pattern. 
     Before the foreground element display method is described, in a possible implementation, the electronic device may first detect whether the foreground element display method provided in the embodiments needs to be used in a current scenario. For example, the electronic device may automatically detect a similarity between the foreground element and the background pattern. The foreground element display method provided in the embodiments is used only when the similarity between the foreground element and the background pattern is high. This solution does not need to be used if the foreground element and the background pattern are very different. 
     In another possible implementation, the electronic device may not detect a similarity between the foreground element and the background pattern and perform display by using the foreground element display method provided in the embodiments, to reduce performance consumption of the terminal device. This is not limited in the embodiments. 
     It should be understood that the similarity between the foreground element and the background pattern may be a difference between a color of a first area in which the foreground element is displayed and a color of a second area corresponding to the first area in the background pattern. When the color difference is less than or equal to a preset threshold, the electronic device determines that the background pattern may affect display of the foreground element, and the foreground element display method provided in the embodiments may be used to ensure the recognition of the foreground element. It should be further understood that a range of the first area in which the foreground element is displayed may be less than or equal to a range of the second area in the background pattern. This is not limited in the embodiments. 
       FIG. 4( a ) ,  FIG. 4( b ) ,  FIG. 4( c ) , and  FIG. 4( d )  are a schematic diagram of several scenario examples according to an embodiment. 
     For example, when a user changes a background pattern, an electronic device may detect a similarity between a foreground element and the background pattern.  FIG. 4( a )  shows display of an original background pattern and the foreground element of the electronic device. The user replaces the original background pattern with a background pattern shown in  FIG. 4( b ) . When the background pattern changes, the electronic device may detect a similarity between the foreground element and the background pattern, to determine whether to process the foreground element. 
     It should be understood that colors of different parts in the background pattern may be different, and patterns in the background pattern may be located in different display areas. When the background pattern changes, the colors in the background pattern, shapes in the patterns, and the display areas may change, and impact on the foreground element may also change. In this case, the electronic device detects the similarity between the foreground element and the background pattern, determines the similarity between the foreground element and the background pattern, and uses the foreground element display method provided in the embodiments only when the similarity between the foreground element and the background pattern is high. 
     It should be understood that, in the embodiments, the electronic device determines, by determining the similarity between the foreground element and the background pattern, whether to process the foreground element by using the foreground element processing method provided in the embodiments. 
     Optionally, the electronic device may further determine a contrast between a color of the foreground element and a color of the background pattern, and this may be understood as determining a similarity between the color of the foreground element and the color of the background pattern. It should be understood that, that the electronic device determines the contrast between the foreground element and the background pattern may be determining a difference between a color of a first area in which the foreground element is displayed and a color of a second area corresponding to the first area in the background pattern, where a range of the first area may be less than or equal to a range of the second area. This is not limited in the embodiments. 
     For example, when the contrast between the color of the foreground element and the color of the background pattern is relatively high, it indicates that the difference between the color of the foreground element and the color of the background pattern is relatively large; or when the contrast between the color of the foreground element and the color of the background pattern is relatively low, it indicates that the color of the foreground element and the color of the background pattern are similar. Alternatively, the electronic device may determine both the similarity and contrast between the color of the foreground element and the color of the background pattern. In the description of this embodiment, an example in which the electronic device determines the similarity between the color of the foreground element and the color of the background pattern is used for description. This is not limited in the embodiments. For example, based on a contrast 4.6:1 of a visible color of an ordinary person, when the contrast between the color of the foreground element and the color of the background pattern is greater than 4.6, the electronic device determines that the user can clearly see the foreground element currently, that is, can obtain information included in the foreground element, for example, clearly obtain information such as time, a date, or a day. This is not limited in the embodiments. 
     It should be further understood that, when determining the similarity or the contrast between the foreground element and the background pattern, the electronic device in the embodiments may separately detect a similarity or a contrast between each element and the background pattern. For example, for “08:53”, the electronic device may separately detect a similarity or a contrast between each element in “0”, “8”, “5”, and “3” and the background pattern. When only a similarity between “8” and the background pattern is greater than a preset threshold, “8” is processed by using the foreground element display method provided in the embodiments, so that the user can clearly recognize “8”. 
     Alternatively, when the user switches a language of the electronic device, the electronic device starts detection to determine the similarity between the foreground element and the background pattern.  FIG. 4( a )  shows a foreground element such as time, a date, or a day displayed when the language is set to simplified Chinese. When the user switches to another language, for example, when the language setting is switched from simplified Chinese to English, Japanese, or another minority language, the foreground element may change. For example, a display area of the time, the date, or the day may become larger or smaller, and impact of the background pattern on the foreground element changes. In this case, the electronic device may start detection to re-determine a similarity between the foreground element and the background pattern. Only when the similarity between the foreground element and the background pattern is high, the foreground element display method provided in the embodiments is used. 
     Alternatively, as shown in  FIG. 4( d ) , when the electronic device is in a screen-locked state, the background pattern is a lock screen pattern. The lock screen pattern of the electronic device may be set to a continuously changing state. For example, if the user presses a power button once but does not unlock the electronic device, the lock screen pattern changes once. In this scenario, the electronic device may start detection based on an operation of pressing the power button by the user, to determine the similarity between the foreground element and the background pattern. Alternatively, the user may trigger the change of the lock screen pattern in another manner. As long as a change of a background element is detected, the electronic device may start detection to determine the similarity between the foreground element and the background pattern. A manner of triggering the change of the lock screen pattern is not limited in the embodiments. When the electronic device detects that the foreground element differs greatly from the background pattern, the electronic device does not need to use the method provided in the embodiments. For example, the electronic device may detect the similarity between a color of the foreground element and a color of the background pattern, or a contrast between a color of the foreground element and a color of the background pattern. When the similarity between the color of the foreground element and the color of the background pattern is greater than a specific threshold, or when the contrast between the color of the foreground element and the color of the background pattern is less than a specific threshold, it may be determined that the background pattern affects display of the foreground element, and the foreground element may be processed by using the foreground element processing method provided in the embodiments. 
     For example, if the background is a pure black picture, and the time, the date, the day, or the like in the foreground element is displayed in white, the electronic device determines that the contrast between the color of the foreground element and the color of the background pattern is relatively large, for example, greater than a preset threshold, and it may be determined that the background pattern has relatively slight impact on the display of the foreground element. In this case, the foreground element does not need to be processed by using the foreground element processing method provided in the embodiments.  FIG. 5( a ) ,  FIG. 5( b ) ,  FIG. 5( c ) , and  FIG. 5( d )  are a schematic diagram of an example of a foreground element processing process according to an embodiment. As shown in  FIG. 5( a ) , a foreground element  501  includes time, a date, and a day. When detecting that a similarity between the foreground element  501  and a background picture is high, for example, a color similarity is greater than a preset threshold, the electronic device extracts the foreground element  501 , and performs complementary color processing on the extracted foreground element  501 . 
     It should be understood that the complementary color processing herein is to change a color of the foreground element to an opposite color or a color with a large color difference from the original color. For example, as shown in  FIG. 5( b ) , the foreground element  501  changes from original white to black. This is not limited in the embodiments. 
     A blur processing operation is performed on a foreground element  502  obtained after the complementary color processing, as shown in  FIG. 5( c ) . In  FIG. 5( c ) , content of a foreground element  503  is displayed in a black and blurred state. Then, the foreground element  503  obtained after the blur processing and the foreground element  501  on which no processing is performed in  FIG. 5( a )  are superimposed, to obtain a foreground element  504  having a display effect shown in  FIG. 5( d ) . 
     As shown in  FIG. 5( d ) , the foreground element  504  is displayed in white, an area around the element has a black blurred shadow effect, and the black blurred shadow may enhance recognition of the foreground element. Compared with the white foreground element  501  in  FIG. 5( a ) , the foreground element in  FIG. 5( d )  is clearer. This helps a user obtain information such as time and a date. In addition, no processing is performed on the background picture in this process, and a display effect of the background picture is not affected. Optionally, the blur processing operation in the embodiments may be implemented by using a blur control algorithm, for example, a Gaussian blur algorithm or a mean blur algorithm. A type of the blur control algorithm is not limited in the embodiments. 
     In a possible implementation, in a process of performing the blur processing operation on the foreground element, a blur degree may be adjusted based on an actual effect. For example,  FIG. 6( a ) ,  FIG. 6( b ) ,  FIG. 6( c ) , and  FIG. 6( d )  are a schematic diagram of an example of foreground elements with different blur degrees according to an embodiment. As shown in  FIG. 6( a ) ,  FIG. 6( b ) ,  FIG. 6( c ) , and  FIG. 6( d ) , the blur degrees of the foreground elements are gradually increased from  FIG. 6( a )  to  FIG. 6( d ) , where the blur degree in  FIG. 6( d )  is the highest. 
     It should be understood that, after the foreground elements with the different blur degrees and an unprocessed foreground element are superimposed, display effects are different. For example, after the foreground element with the highest blur degree shown in  FIG. 6( d )  and the unprocessed foreground element are superimposed, a display effect is clearer. However, a higher blur degree may indicate a larger area in which the foreground element covers the background picture. Therefore, to reduce impact on the background picture and ensure a display effect of the background picture, the electronic device may automatically adjust the blur degree based on an actual effect. 
     For example, after the foreground element with the blur degree shown in  FIG. 6( b )  and the unprocessed foreground element are superimposed, the foreground element can be clearly displayed on the background picture, and the electronic device detects that in a current display effect, a similarity between the foreground element and the background picture is less than a preset threshold. Therefore, the electronic device determines that the current blur degree can meet a current requirement. In this case, the foreground element is processed by using the blur degree shown in  FIG. 6( b )  as a standard, to ensure recognition of the foreground element. 
     It should be understood that, in the embodiments, that the foreground element is clearly displayed on the background picture may be understood as the foregoing enumerated case in which the electronic device determines, by determining a similarity between the foreground element and the background pattern or by determining a contrast between a color of the foreground element and a color of the background pattern, that the user can clearly see the foreground element currently, and obtain information about the foreground element. 
     For example, based on a contrast 4.6:1 of a visible color of an ordinary person, when the contrast between the color of the foreground element and the color of the background pattern is greater than 4.6, the electronic device determines that the user can clearly see the foreground element currently, that is, can obtain information included in the foreground element, for example, clearly obtain information such as time, a date, or a day. This is not limited in the embodiments. Optionally, in addition to the foregoing described fact that the electronic device automatically adjusts the blur degree based on an actual effect, participation of the user may be further introduced, and the user adjusts the blur degree. For example, the user sets the blur degree in the settings for setting a wallpaper, to achieve a display effect desired by the user. A user setting and operation process is not limited in the embodiments. 
     In a process in which the electronic device automatically adjusts the blur degree based on an actual effect, four blur levels may be preset. For example, a first level is a “completely non-blurred” processing effect, blur degrees at a second level and a third level are gradually enhanced, and a fourth level is a “completely blurred” processing effect. 
     For example, in the processing process described in  FIG. 5( a )  to  FIG. 5( d ) , the blur processing in  FIG. 5( c )  is first performed by using the first level (the “completely non-blurred” processing effect), to achieve an effect implemented after fusion in  FIG. 5( d ) . Then, the electronic device detects the contrast between the color of the foreground element and the color of the background picture in  FIG. 5( d ) . When the contrast reaches a preset threshold (for example, the standard contrast 4.6), a current first-level blur processing effect meets a current requirement. Otherwise, the blur processing degree is increased to the second level, and cyclic processing is continued until the electronic device detects that the contrast between the color of the foreground element and the color of the background picture reaches the preset threshold. This is not limited in the embodiments. 
     In the foregoing method, a degree of blur processing on the foreground element may be adjusted in a display process of the foreground element, to adapt to different scenarios. When the foreground element or the background picture changes, the blur degree of the foreground element is adjusted in real time, to meet a current requirement and ensure a display effect of the foreground element. 
     It should be understood that, to describe the foregoing processing process of the foreground element, in the accompanying drawings, a change of the foreground element in the processing process is displayed on a display interface of the electronic device. In an actual application process, the electronic device may display only the final superimposed foreground element  504  shown in  FIG. 5( d ) . In other words, a processing process of the foreground element shown in  FIG. 5( b )  and  FIG. 5( c )  is not shown on the interface of the electronic device. This is not limited in the embodiments. When the electronic device starts detection and determines that the current similarity between the background picture and the foreground element is greater than or equal to the preset threshold, it is determined that the foreground element display method in the embodiments needs to be used, and the foreground element with the effect shown in  FIG. 5( d )  is displayed by using the foregoing processing process. 
     In the foreground element display method described above, when the similarity between the foreground element and the background picture is high, the foreground element is extracted, the complementary color processing is performed on the extracted foreground element, and the blur processing is performed on the foreground element obtained after the complementary color processing. Then, the foreground element obtained after the blur processing and an original foreground element on which no processing is performed are superimposed, so that the foreground element has a clear display effect on the background picture, to ensure recognition of the foreground element and make the display effect natural. In addition, the background can be dynamically processed in real time following the change of the foreground element. In this way, an effect of the background picture is not affected. The display effect of the foreground element is natural, and the foreground element can be clearly displayed in any background pattern. 
     During use of the electronic device, the foreground element may change. For example, as time changes, foreground elements such as time, a date, and a day change constantly on the interface. According to the foreground element display method provided in the embodiments, dynamic processing may also be performed in real time for a constantly changing foreground element, to ensure a clear display effect of the foreground element on the background picture. 
       FIG. 7( a ) ,  FIG. 7( b ) ,  FIG. 7( c ) , and  FIG. 7( d )  are a schematic diagram of another example of a foreground element processing process according to an embodiment. When time of the electronic device changes from 08:53 to 08:54, and the foreground element changes, the electronic device starts the foreground element processing process in the embodiments. For example, as shown in  FIG. 7( a ) , time, a date, and a day are displayed in white font. The electronic device extracts the white foreground element, and performs complementary color processing on the extracted foreground element, to achieve a display effect shown in  FIG. 7( b ) , where the foreground element is displayed in black. The electronic device performs blur processing on the black foreground element, and then superimposes a foreground element obtained after the blur processing and the foreground element on which no processing is performed in  FIG. 7( a ) , to obtain a foreground element shown in  FIG. 7( d ) . In  FIG. 7( d ) , the foreground element is displayed in white, an area around the element has a black blurred shadow effect, and the black blurred shadow may enhance recognition of the foreground element. Compared with the white foreground element in  FIG. 7( a ) , the foreground element in  FIG. 7( d )  is clearer. This helps a user obtain information such as the time and the date. In addition, no processing is performed on a background picture in this process, and a display effect of the background picture is not affected. 
     It should be understood that, in addition to the foregoing enumerated foreground elements such as the time, the date, and the day, the embodiments may be further used to process names of icons of various third-party applications, for example, icons or names of applications such as Alipay and WeChat; or an element displayed on an interface may include an icon, a name, and the like of a folder created by the user. This is not limited in the embodiments. 
     In the foreground element processing processes described in  FIG. 5( a ) ,  FIG. 5( b ) ,  FIG. 5( c ) , and  FIG. 5( d )  to  FIG. 7( a ) ,  FIG. 7( b ) ,  FIG. 7( c ) , and  FIG. 7( d ) , a display area in which each element is located is used as a processing object. For example, for a processing process of “08:53”, display areas in which the characters “0”, “8”, “5”, and “3” are located are used as processing objects to perform complementary color processing. Blur processing is performed on digits obtained after the complementary color processing. Then, digits obtained after the blur processing and original digits on which no processing is performed are superimposed. In this way, the digits have a clear display effect on a background picture.  FIG. 8( a ) ,  FIG. 8( b ) ,  FIG. 8( c ) , and  FIG. 8( d )  are a schematic diagram of another example of a foreground element processing process according to an embodiment. In  FIG. 8( a ) ,  FIG. 8( b ) ,  FIG. 8( c ) , and  FIG. 8( d ) , a foreground element processing method is described by using, as a processing object, a fixed area in which a foreground element is located. As shown in  FIG. 8( a ) , the foreground element is not clearly displayed on a background picture. When determining that a similarity between the current foreground element and the background pattern is relatively high, or a contrast is less than a preset threshold, the electronic device obtains a display area in which the foreground element is located. It should be understood that the display area herein may be understood as an area occupied by characters “0”, “8”, “5”, or “3”. 
     As shown in  FIG. 8( b ) , after determining the display area in which the foreground element is located, the electronic device determines a fixed area based on the display area of the foreground element. The fixed area may be a rectangular area with a specific width and a specific height. For example, the fixed area may be three black rounded rectangular areas shown in  FIG. 8( b ) . The fixed area is used as a processing object, and complementary color processing is performed on the entire fixed area. For example, the fixed area is displayed as a black rounded rectangular box. 
     It should be understood that the rectangular area herein is merely an example, and the fixed area determined by the electronic device may have different shapes, for example, an irregular shape. This is not limited in the embodiments. 
     The electronic device performs a blur processing operation on the determined fixed area in  FIG. 8( b ) , to achieve a display effect shown in  FIG. 8( c ) . After the fixed area undergoes the blur processing, the fixed area has a blurred edge and a black display effect. Then, the fixed area obtained after the blur processing and the foreground element on which no processing is performed in  FIG. 8( a )  are superimposed, to obtain a foreground element having a display effect shown in  FIG. 8( d ) . 
     Optionally, the blur processing operation in the embodiments may be implemented by using a blur control algorithm, for example, a Gaussian blur algorithm or a mean blur algorithm. A type of the blur control algorithm is not limited in the embodiments. 
     As shown in  FIG. 8( d ) , the foreground element is displayed in white, a fixed area around the element has a black blurred shadow effect, and the black blurred shadow may enhance recognition of the foreground element. Compared with the white foreground element in  FIG. 8( a ) , the foreground element in  FIG. 8( d )  is clearer. This helps a user obtain information such as time and a date, and does not affect a display effect of the background picture. 
     A foreground element has different display effects on different background pictures. A same foreground element displayed on different background pictures undergoes different impact of the background pictures. For example, for a time element “08:53” in the foreground element, display of a part of each digit may be affected by the background picture. 
     In a possible implementation, the electronic device may process a part or all of an area in which the foreground element is affected by the background picture. For example, an area in which complementary color processing and blur processing are performed and an unprocessed foreground element is superimposed is a part of an area of the foreground element. 
       FIG. 9( a ) ,  FIG. 9( b ) ,  FIG. 9( c ) , and  FIG. 9( d )  are a schematic diagram of another example of a foreground element processing process according to an embodiment. For example, as shown in  FIG. 9( a ) , a background picture area  901  affects display of a partial foreground element area  902 . In a foreground element processing process, only the partial foreground element area  902  is processed. 
     Optionally, an electronic device obtains a foreground element in the partial foreground element area  902  shown in  FIG. 9( a ) . After complementary color processing and blur processing are performed on the partial foreground element, and an obtained partial foreground element and the unprocessed partial foreground element are superimposed, a display effect shown in  FIG. 9( b )  is achieved. In  FIG. 9( b ) , the display of the partial foreground element area  902  becomes clear, and no processing is performed on a foreground element other than the partial foreground element area  902 . 
     For example, in an actual application process, a background picture of the electronic device includes a light-colored area  903  (a white area) and a dark-gray area  904  (a colored area) shown in  FIG. 9( c ) , and time and a date are used as foreground elements. An upper half area  905  of the time element overlaps the light-colored area  903 , display of the upper half area  905  of the time element is affected by the light-colored area  903  of the background picture, and therefore, a user cannot obtain information in the upper half area  905 . In this case, the electronic device determines that a similarity between the upper half area  905  of the time element and the light-colored area  903  of the background picture is relatively large, and the upper half area  905  of the time element may be processed by using the method provided in the embodiments. 
     For example, the electronic device may obtain only the upper half area  905  of the time element. After complementary color processing and blur processing are performed on the upper half area  905  of the time element, and the upper half area  905  of the time element and the unprocessed partial foreground element are superimposed, an effect shown in  FIG. 9( d )  may be displayed. In this case, the upper half area  905  of the time element may be clearly displayed, and the user may obtain time information of the part. It should be understood that a lock screen interface is used as an example herein. The foreground element display method provided in the embodiments may be applied to any interface, for example, an unlocked interface. This is not limited in the embodiments. 
     Optionally, the electronic device may further determine the fixed area based on a partial foreground element-area  802 , and perform corresponding processing on the fixed area according to the method described in  FIG. 8( a )  to  FIG. 8( d ) . For example, the electronic device performs corresponding processing by using a white area in  FIG. 9( b )  as the fixed area. This is not limited in the embodiments. 
     Therefore, according to the foreground element display method provided in the embodiments, the foreground element is extracted, the complementary color processing is first performed on the extracted foreground element, and then the blur processing is performed on the foreground element obtained after the complementary color processing. Finally, the foreground element obtained after the blur processing and an original foreground element on which no processing is performed are superimposed, so that the foreground element has a clear display effect on the background picture. In addition, when the foreground element changes, the method can perform the foregoing processing on the changed foreground element in real time, can perform dynamic processing on the background in real time following the change of the foreground element, and does not affect an effect of the background picture. In this way, the foreground element has a clear display effect on an interface of the electronic device. The method can ensure recognition of foreground element, so that in any background pattern, the foreground element can have a clear and natural display effect, thereby helping the user obtain information, and improving user experience. 
     With reference to the foregoing embodiments and related accompanying drawings, an embodiment provides a foreground element display method. The method may be implemented in the electronic device (for example, a mobile phone or a tablet computer) that has a camera and that is shown in  FIG. 1  and  FIG. 2 .  FIG. 10  is a schematic flowchart of a foreground element display method according to an embodiment. As shown in  FIG. 10 , the method may include the following steps. 
       1001 : Display a first interface, where the first interface includes a first foreground element and a first background element, and the first foreground element has a first display effect. 
       1002 : Receive a first operation of a user, and display a second interface, where the second interface includes the first foreground element and a second background element. 
     For example, as shown in  FIG. 5( a ) , the first foreground element may be at least one of the time, the date, the weather, the icon of the application, or the name of the application on the electronic device. A time element or a date element of the electronic device is used as an example. The first display effect may be a default display effect of the electronic device or a display effect that is set by the user, for example, a color, a font, or a size for displaying the time element or the date element. 
     For example, the first operation may be an operation of changing a wallpaper of the electronic device by the user. As shown in  FIG. 4( a )  and  FIG. 4( b ) , the wallpaper of the electronic device is changed to a wallpaper shown in  FIG. 4( b ) . That is, the first background element is replaced with the second background element. 
     In a possible implementation, when the wallpaper of the electronic device is changed from the first background element to the second background element, the electronic device may detect a similarity between the first foreground element and the second background element. When the similarity between the first foreground element and the second background element is greater than or equal to a first preset threshold, the first foreground element has a second display effect, and the first display effect is different from the second display effect. 
     In another possible implementation, when a similarity between the first foreground element and the second background element is less than a first preset threshold, the first foreground element has the first display effect. 
     For example, the second display effect may be a display effect shown in  FIG. 5( d ) , that is, a black shadow effect around the time element or the date element is added. For example, complementary color processing is sequentially performed on the time element and the date element of the electronic device to achieve a display effect shown in  FIG. 5( b ) . Then, blur processing shown in  FIG. 5( c )  is performed. Finally, a time element and the date element obtained after the blur processing and the time element and the date element on which no processing is performed shown in  FIG. 5( a )  are superimposed, to achieve the second display effect shown in  FIG. 5( d ) . 
     In another possible implementation, the electronic device may further receive a second operation of the user, and display a third interface. The third interface includes a second foreground element and the first background element; and when a similarity between the second foreground element and the first background element is greater than or equal to the first preset threshold, the second foreground element has the second display effect; or when a similarity between the second foreground element and the first background element is less than the first preset threshold, the second foreground element has the first display effect. 
     For example, the second operation may be an operation of changing display of the foreground element of the electronic device by the user. As shown in  FIG. 4( a )  and  FIG. 4( c ) , the font of the time element or the date element of the electronic device is changed to English shown in  FIG. 4( c ) . That is, the first foreground element is changed to the second foreground element, and the wallpaper of the electronic device does not change. 
     In a possible implementation, when the wallpaper of the electronic device is changed from the first foreground element to the second foreground element, the electronic device may detect a similarity between the second foreground element and the first background element. When the similarity between the second foreground element and the first background element is greater than or equal to the first preset threshold, the second foreground element has the second display effect. 
     In another possible implementation, when the similarity between the second foreground element and the first background element is less than the first preset threshold, the first foreground element has the first display effect. 
     For example, the second display effect may be a display effect shown in  FIG. 7( d ) , that is, a black shadow effect around the time element or the date element is added. For example, complementary color processing is sequentially performed on the time element and the date element of the electronic device to achieve a display effect shown in  FIG. 7( b ) . Then, blur processing shown in  FIG. 7( c )  is performed. Finally, a time element and the date element obtained after the blur processing and the time element and the date element on which no processing is performed shown in  FIG. 7( a )  are superimposed, to achieve the second display effect shown in  FIG. 7( d ) . 
     Optionally, the first background element and the second background element may be wallpapers of the electronic device in a screen-locked state or wallpapers of the electronic device in a screen-unlocked state. 
     In some possible implementations, in addition to the time element and the date element, the first foreground element and the second foreground element each may be weather, an icon of an application, a name of an application, and the like on a display interface of the electronic device. This is not limited in the embodiments. 
     It should be understood that, when the user changes the wallpaper of the electronic device, or changes display of a font or a language setting of a foreground element such as time or a date, the electronic device starts detection to determine the similarity between the foreground element and the background pattern. Impact of the background pattern on the foreground element changes. In this case, the electronic device may start detection to re-determine a similarity between the foreground element and the background pattern. Only when the similarity between the foreground element and the background pattern is high, the foreground element display method provided in the embodiments is used. 
     In addition, when the electronic device is in a screen-locked state, the background pattern is a lock screen pattern. The lock screen pattern of the electronic device may be set to a continuously changing state. For example, if the user presses a power button once but does not unlock the electronic device, the lock screen pattern changes once. In this scenario, the electronic device may start detection by pressing the power button by the user, and determine the similarity between the foreground element and the background pattern. Alternatively, the user may trigger the change of the lock screen pattern in another manner. As long as a change of the background element is detected, the electronic device may start detection to determine the similarity between the foreground element and the background pattern. A manner of triggering the change of the lock screen pattern is not limited in the embodiments. 
     When the electronic device detects that the foreground element differs greatly from the background pattern, the electronic device does not need to use the method provided in the embodiments. For example, the electronic device may detect the similarity between a color of the foreground element and a color of the background pattern, or a contrast between a color of the foreground element and a color of the background pattern. When the similarity between the color of the foreground element and the color of the background pattern is greater than a specific threshold, or when the contrast between the color of the foreground element and the color of the background pattern is less than a specific threshold, it may be determined that the background pattern affects display of the foreground element, and the foreground element may be processed by using the foreground element processing method provided in the embodiments. 
     In the foreground element display method described above, when the similarity between the foreground element and the background picture is high, the foreground element is extracted, the complementary color processing is performed on the extracted foreground element, and the blur processing is performed on the foreground element obtained after the complementary color processing. Then, the foreground element obtained after the blur processing and an original foreground element on which no processing is performed are superimposed, so that the foreground element has a clear display effect on the background picture, to ensure recognition of the foreground element and make the display effect natural. In addition, the background can be dynamically processed in real time following the change of the foreground element. In this way, an effect of the background picture is not affected. The display effect of the foreground element is natural, and the foreground element can be clearly displayed in any background pattern. 
     It may be understood that, to implement the foregoing functions, the electronic device includes corresponding hardware and/or software modules for executing the functions. With reference to algorithm steps of each example described in the embodiments, the embodiments may be implemented in a hardware form or in a form of combining hardware with computer software. Whether a function is performed by hardware or hardware driven by computer software depends on particular applications and design constraints of the solutions. A person of ordinary skill in the art may use different methods to implement the described functions for each particular application with reference to the embodiments, but it should not be considered that the implementation goes beyond the scope of the embodiments. 
     In the embodiments, the electronic device may be divided into function modules based on the example in the foregoing method. For example, each function module corresponding to each function may be obtained through division, or two or more functions may be integrated into one processing module. The integrated module may be implemented in a form of hardware. It should be noted that, in this embodiment, module division is an example, and is merely a logical function division. In actual implementation, another division manner may be used. 
     When each function module corresponding to each function is obtained through division,  FIG. 11  is a schematic diagram of possible composition of an electronic device  1100  in the foregoing embodiments. As shown in  FIG. 11 , the electronic device  1100  may include a display unit  1101  and a processing unit. 
     The display unit  1101  may be configured to support the electronic device  1100  in performing the steps  1001 ,  1002 , and the like, and/or another process used for the technology described herein. 
     The processing unit  1102  may be configured to support the electronic device  1100  in performing the foregoing described process of determining a contrast or a similarity between a foreground element and a background element, to control a display effect or the like of the display unit, and/or another process of the technology described herein. 
     It should be noted that all related content of the steps in the foregoing method embodiments may be cited in function descriptions of corresponding function modules. Details are not described herein again. 
     The electronic device provided in this embodiment is configured to perform the foreground element display method. Therefore, an effect same as the effect of the foregoing implementation methods can be achieved. 
     When an integrated unit is used, the electronic device may include a processing module, a storage module, and a communications module. The processing module may be configured to control and manage actions of the electronic device, for example, may be configured to support the electronic device in performing the steps performed by the display unit  1101  and the processing unit  1102 . The storage module may be configured to support the electronic device in storing program code, data, and the like. The communications module may be configured to support communication between the electronic device and another device. 
     The processing module may be a processor or a controller. The processor may implement or execute various example logical blocks, modules, and circuits described with reference to content described in the embodiments. Alternatively, the processor may be a combination of processors implementing a computing function, for example, a combination of one or more microprocessors, or a combination of a digital signal processor (DSP) and a microprocessor. The storage module may be a memory. The communications module may be a device that interacts with another electronic device, such as a radio frequency circuit, a Bluetooth chip, or a Wi-Fi chip. 
     In an embodiment, when the processing module is a processor and the storage module is a memory, the electronic device in this embodiment may be a device in the structure shown in  FIG. 1 . 
     An embodiment further provides a computer storage medium. The computer storage medium stores computer instructions. When the computer instructions are run on an electronic device, the electronic device is enabled to perform the related method steps, to implement the foreground element display method in the foregoing embodiments. 
     An embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is enabled to perform the foregoing related steps, to implement the foreground element display method in the foregoing embodiments. 
     In addition, an embodiment further provides an apparatus. The apparatus may be a chip, a component, or a module. The apparatus may include a processor and a memory that are connected to each other. The memory is configured to store computer-executable instructions. When the apparatus runs, the processor may execute the computer-executable instructions stored in the memory, to enable the chip to perform the foreground element display method in the foregoing method embodiments. 
     The electronic device, the computer storage medium, the computer program product, or the chip provided in the embodiments is configured to perform the corresponding method provided above. Therefore, for effects that can be achieved, refer to the effects in the corresponding method provided above. Details are not described herein again. 
     The foregoing descriptions about implementations allow a person of ordinary skill in the art to understand that, for the purpose of convenient and brief description, division of the foregoing function modules is taken as an example for illustration. In actual application, the foregoing functions can be allocated to different modules and implemented according to a requirement, that is, an inner structure of an apparatus is divided into different function modules to implement all or some of the functions described above. 
     In the several embodiments provided, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the described apparatus embodiment is merely an example. For example, the module or unit division is merely logical function division and may be other division in actual implementation. For example, a plurality of units or components may be combined or integrated into another apparatus, or some features may be ignored or not performed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented through some interfaces. The indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or another form. 
     The units described as separate parts may or may not be physically separate, and parts displayed as units may be one or more physical units, may be located in one place, or may be distributed on different places. Some or all of the units may be selected based on actual requirements to achieve the objectives of the solutions of the embodiments. 
     In addition, function units in the embodiments may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in a form of hardware, or may be implemented in a form of a software function unit. 
     When the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, the integrated unit may be stored in a readable storage medium. Based on such an understanding, the solutions in the embodiments essentially, or the part contributing to the conventional technology, or all or some of the solutions may be implemented in the form of a software product. The software product is stored in a storage medium and includes several instructions for instructing a device (which may be a single-chip microcomputer, a chip, or the like) or a processor to perform all or some of the steps of the methods described in the embodiments. The foregoing storage medium includes: any medium that can store program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc. 
     The foregoing descriptions are merely specific implementations of the embodiments, but are not limiting. Any variation or replacement readily figured out by a person of ordinary skill in the art within the scope disclosed in the embodiments.