Patent Publication Number: US-2022215587-A1

Title: Color palette for capturing person&#39;s image for determination of facial skin color, and method and apparatus using same

Description:
TECHNICAL FIELD 
     Various embodiments relate to a color palette for capturing a person image in order to determine a facial skin color and a method and apparatus using the same. 
     BACKGROUND ART 
     In performing color calibration on a digital image or accurately confirming a phenomenon in which a color is distorted by a light source upon image capturing, a color checker is used. If color calibration is performed on an image by using the color checker, optimized color calibration results for various color areas constituting the image are expected. Furthermore, in order to calculate the accuracy of the color calibration results, a colorimetric value obtained by directly measuring an object by using a spectrophotometer set as a standard illuminant and a color calibration result are compared. In general, a difference between a colorimetric value and a color calibration result is called a color difference. However, although color calibration is performed using the color checker, a color difference has a relatively large value. A skin color is different depending on race and is also various even within the same race. Accordingly, there is a difficulty in distinguishing between skin colors by using the color checker. 
     DISCLOSURE 
     Technical Problem 
     Various embodiments provide a method and apparatus for determining a skin color. Various embodiments provide a color palette as a photographing tool for determining a skin color, and a method and apparatus using the same. Various embodiments provide a color palette for capturing a person image in order to determine a facial skin color of a user and a method and apparatus using the same. 
     Technical Solution 
     An operating method of an electronic device according to various embodiments may include executing an application, capturing a facial image including a color palette, extracting a skin area and multiple reference areas from the facial image based on the color palette, detecting first colorimetric information for the skin area and second colorimetric information for the reference areas, and determining a skin color of the skin area by comparing the first colorimetric information and the second colorimetric information. 
     An electronic device according to various embodiments may include a camera module and a processor coupled to the camera module. The processor may be configured to execute an application, capture a facial image including a color palette through the camera module, extract, from the facial image, a skin area and multiple reference areas corresponding to the color palette, detect first colorimetric information for the skin area and second colorimetric information for the reference areas, and determine a skin color of the skin area by comparing the first colorimetric information and the second colorimetric information. 
     A color palette according to various embodiments may include a central section which is provided to define a skin area in a facial image including the color palette and is an empty space or transparent, and multiple color sections provided to define multiple reference areas to be used to determine a skin color of the skin area in the facial image, arranged to surround the central section and arranged according to a rule determined based on at least one color characteristic. 
     Advantageous Effects 
     According to various embodiments, the electronic device can more accurately determine a skin color in a facial image including the color palette with reference to a color characteristic of the color palette. In this case, a user can directly define a portion in which a skin color is to be identified by adjusting a location of the color palette in the face of the user. 
     Accordingly, the electronic device can determine a skin color with respect to various portions of the face. Accordingly, the user can check a change in the skin according to at least any one of time or a place. Moreover, the electronic device can transmit, to an external device, information on a skin color of the user. Accordingly, consumer needs can be satisfied because a cosmetic maker having the external device uses the information to research and fabricate a product. Furthermore, the electronic device can calibrate a facial image based on a skin color of a user. Accordingly, the size of an error when the electronic device calibrating the facial image can be minimized. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram illustrating an electronic device according to various embodiments. 
         FIG. 2  is a diagram illustrating a color palette according to various embodiments. 
         FIG. 3  is a diagram illustrating an operating method of the electronic device according to various embodiments. 
         FIG. 4  is a diagram illustrating an operation of extracting a skin area and reference areas in  FIG. 3 . 
         FIG. 5  is a diagram illustrating an operation of determining a skin color in  FIG. 3 . 
         FIGS. 6, 7, 8, 9, 10 and 11  are diagrams for describing an operating method of the electronic device according to various embodiments. 
     
    
    
     MODE FOR INVENTION 
     Hereinafter, various embodiments of this document are described with reference to the accompanying drawings. 
       FIG. 1  is a diagram illustrating a color palette  100  according to various embodiments. 
     Referring to  FIG. 1 , the color palette  100  according to various embodiments may be used to determine a skin color of a user. To this end, when an electronic device ( 200  in  FIG. 2 ) captures an image related to the skin of the user, the color palette  100  may be overlapped with the skin of the user. In this case, the color palette  100  may be overlapped with the face of the user. Accordingly, the electronic device  100  may capture a facial image including the color palette  100  and the face of the user. 
     According to various embodiments, the color palette  100  may include a grip part  110  and a head part  120 . The grip part  110  may be gripped by a user. The grip part  110  may be formed in a bar shape, for example, but the present disclosure is not limited thereto. The head part  120  may be coupled to the grip part  110 . The head part  120  may be used to substantially determine a skin color of a user. In this case, the head part  120  may be overlapped with the face of the user. The head part  120  may include a central section  121  and multiple color sections  123 . The central section  121  may be an empty space or may be transparent. The color sections  123  may surround the central section  121  by being radially arranged around the central section  121 . Furthermore, each of the color sections  123  may be disposed according to a rule determined based on at least one color characteristic. In this case, the color characteristic may include at least any one of brightness or a tone of a color provided to each of the color sections  123 . 
     For example, color sections (a, b, c, d, e, and f)  123  may include six color sections (a, b, c, d, e, and f), that is, a first color section (a), a second color section (d), a third color section (b), a fourth color section (f), a fifth color section (e) and a sixth color section (c). The first color section (a), the second color section (d), the third color section (b), the fourth color section (f), the fifth color section (e) and the sixth color section (c) may be counterclockwise arranged on the basis of the central area (s)  121 . In this case, color characteristics of the color sections (a, b, c, d, e, and f) may be defined based on CIE LAB. Brightness of each of the color sections (a, b, c, d, e, and f) may be defined based on reflectance L as in [Table 1] below, and may be lower in order of the first color section (a), the third color section (b), the sixth color section (c), the second color section (d), the fifth color section (e), and the fourth color section (f). Tones of the color sections (a, b, c, d, e, and f) may be defined based on chromaticity diagrams (a, b; b-1.1a) as in [Table 2] below, and may be lower in order of the sixth color section (c), the first color section (a), the third color section (b), the second color section (d), the fifth color section (e), and the fourth color section (f). 
     
       
         
           
               
               
               
               
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                   
                 Color 
                   
                   
                   
                   
                   
                 indi- 
               
               
                   
                 name 
                 L 
                 a 
                 b 
                 b-1.1a 
                 function 
                 cator 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 a 
                 Light  
                 72.06 
                 −0.74 
                  6.99 
                   7.804 
                 Lightness 1 
                 2.8 
               
               
                   
                 grayish 
                   
                   
                   
                   
                   
                   
               
               
                   
                 yellow 
                   
                   
                   
                   
                   
                   
               
               
                 b 
                 2Y04 
                 68.54 
                 8.64 
                 14.45 
                   4.946 
                 Lightness 2 
                 3.1 
               
               
                 c 
                 4Y06 
                 64.99 
                 7.36 
                 17.02 
                   8.924 
                 Lightness 3 
                 3.5 
               
               
                 d 
                 2R08 
                 59.58 
                 13.86 
                 16.97 
                   1.724 
                 Lightness 4 
                 4.0 
               
               
                 e 
                 3R11 
                 49.65 
                 15.96 
                 17.47 
                 −0.086 
                 Lightness 5 
                 5.0 
               
               
                 f 
                 Black 
                  0.24 
                 0.24 
                 −0.41 
                 −0.674 
                 Lightness 6 
                 7.9 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                   
                 Color name 
                 L 
                 a 
                 b 
                 b-1.1a 
                 function 
                 indicator 
               
               
                   
               
             
            
               
                 c 
                 4Y06 
                 64.99 
                  7.36 
                 17.02 
                   8.924 
                 Tone 1 
                 Neutral 
               
               
                 a 
                 Light  
                 72.06 
                 −0.74 
                  6.99 
                   7.804 
                 Tone 2 
                 Neutral 
               
               
                   
                 grayish 
                   
                   
                   
                   
                   
                   
               
               
                   
                 yellow 
                   
                   
                   
                   
                   
                   
               
               
                 b 
                 2Y04 
                 68.54 
                  8.64 
                 14.45 
                   4.946 
                 Tone 3 
                 Cool 
               
               
                 d 
                 2R08 
                 59.58 
                 13.86 
                 16.97 
                   1.724 
                 Tone 4 
                 Cool 
               
               
                 e 
                 3R11 
                 49.65 
                 15.96 
                 17.47 
                 −0.086 
                 Tone 5 
                 Cool 
               
               
                 f 
                 Black 
                  0.24 
                  0.24 
                 −0.41 
                 −0.674 
                 Tone 6 
                 Cool 
               
               
                   
               
            
           
         
       
     
     The color palette  100  according to various embodiments may include the central section  121  which is provided to define a skin area in a facial image including the color palette  100  and is an empty space or transparent, and the multiple color sections  123  which are provided to define multiple reference areas to be used to determine a skin color of the skin area in a facial image, arranged to surround the central section  121 , and disposed according to a rule determined based on at least one color characteristic. 
     According to various embodiments, a color characteristic may include at least any one of brightness or a tone of a color provided to each of the color sections  123 . 
     According to various embodiments, the color sections (a, b, c, d, e, and f)  123  may include the first color section (a), the second color section (d), the third color section (b), the fourth color section (f), the fifth color section (e) and the sixth color section (c) which are counterclockwise arranged. 
     According to various embodiments, brightness may be lower in order of the first color section (a), the third color section (b), the sixth color section (f), the second color section (d), the fifth color section (e), and the fourth color section (f). 
     According to various embodiments, a tone may be lower in order of the sixth color section (f), the first color section (a), the third color section (b), the second color section (d), the fifth color section (e), and the fourth color section (f). 
       FIG. 2  is a diagram illustrating an electronic device  200  according to various embodiments. 
     Referring to  FIG. 2 , the electronic device  200  according to various embodiments may include at least any one of an input module  210 , a communication module  220 , a camera module  230 , a display module  240 , a memory  250  or a processor  260 . In an embodiment, at least any one of the components of the electronic device  200  may be omitted, or one or more component may be added to the electronic device  200 . 
     The input module  210  receives an instruction to be used for at least one component of the electronic device  200 . The input module  210  may include at least any one of an input device configured to enable a user to directly input an instruction or data to the electronic device  200  or a sensor device configured to generate data by detecting a surrounding environment. For example, the input device may include at least any one of a microphone, a mouse or a keyboard. 
     The communication module  220  may perform communication with an external device (not illustrated) in the electronic device  200 . The communication module  220  may establish a communication channel between the electronic device  200  and the external device, and may perform communication with the external device through the communication channel. The communication module  220  may include at least any one of a wired communication module or a wireless communication module. For example, the wireless communication module may perform communication with the external device over at least any one of a long range communication network or a short range communication network. 
     The camera module  230  may capture an image. For example, the camera module  230  may include at least any one of a lens, an image sensor, an image signal processor or a flash. 
     The output module  240  may visually provide information to the outside of the electronic device  200 . The output module  240  may include at least any one of a display module for visually providing information or an audio module for acoustically providing information. For example, the display module may include at least any one of a display, a hologram device or a projector. In an embodiment, the display module may include at least any one of touch circuitry configured to detect a touch or a sensor circuit configured to measure the intensity of a force generated by a touch. 
     The memory  250  may store various data used by at least one component of the electronic device  200 . For example, the memory  250  may include at least one of a volatile memory or a nonvolatile memory. The data may include a program or input data or output data for an instruction related to the program. The program may be stored in the memory  250  as software, and may include at least any one of an operating system, middleware, or an application. The application may include an application for determining a skin color of a facial image. The memory  250  may store information related to the color palette  100 . For example, the memory  250  may store color characteristics of the color sections (a, b, c, d, e, and f)  123  as in at least any one of [Table 1] or [Table 2]. 
     The processor  260  may control at least one component of the electronic device  200  by executing a program of the memory  250 , and may perform data processing or operation. The processor  260  may execute an application. The application may include an application for determining a skin color of a facial image. 
     The processor  260  may capture a facial image through the camera module  230  while executing an application. The facial image may include at least a part of a face of a user and the color palette  100 . The processor  260  may extract a skin area and a reference area from the facial image based on the color palette  100 . The processor  260  may extract the skin area from the facial image in accordance with the central section  121 , and may extract reference areas from the facial image in accordance with the color sections  123 . The processor  260  may detect colorimetric information for a skin area and reference areas. The processor  260  may detect first colorimetric information for the skin area, and may detect second colorimetric information for the reference areas. In this case, the first colorimetric information may include at least any one of brightness or a tone of the skin area. The second colorimetric information may include at least any one of brightness or a tone of each of the reference areas. 
     Accordingly, the processor  260  may determine a skin color of a skin area based on colorimetric information for the skin area and reference areas. At this time, the processor  260  may detect color information representing the skin color. According to a first embodiment, the processor  260  may transmit the color information to the external device through the communication module  220 . According to a second embodiment, the processor  260  may calibrate a facial image based on the color information. According to a third embodiment, the processor  260  may display the color information through the display module. 
     The electronic device  200  according to various embodiments may include the camera module  230 , and the processor  260  coupled to the camera module  230 . 
     According to various embodiments, the processor  260  may be configured to execute an application, capture a facial image including the color palette  100  through the camera module  230 , extract, from the facial image, a skin area and multiple reference areas corresponding to the color palette  100 , detect first colorimetric information for the skin area and second colorimetric information for the reference areas, and determine a skin color of the skin area by comparing the first colorimetric information and the second colorimetric information. 
     The color palette  100  according to various embodiments may include the central section  121  which is provided to define a skin area and is an empty space or transparent and the multiple color sections  123  which are provided to define reference areas, arranged to surround the central section  121 , and disposed according to a rule determined based on at least one color characteristic. 
     According to various embodiments, the color characteristic may include at least any one of brightness or a tone of a color provided to each of the color sections  123 . 
     According to various embodiments, the color sections (a, b, c, d, e, and f)  123  may include the first color section (a), the second color section (d), the third color section (b), the fourth color section (f), the fifth color section (e), and the sixth color section (c) which are counterclockwise arranged. 
     According to various embodiments, brightness may be lower in order of the first color section (a), the third color section (b), the sixth color section (f), the second color section (d), the fifth color section (e), and the fourth color section (f). 
     According to various embodiments, a tone may be lower in order of the sixth color section (f), the first color section (a), the third color section (b), the second color section (d), the fifth color section (e), and the fourth color section (f). 
     According to various embodiments, the processor  260  may be configured to may determine whether reference areas are arranged according to a rule based on second colorimetric information for the reference areas and to determine a skin color of a skin area by comparing first colorimetric information and second colorimetric information if the reference areas are arranged identically with the rule. 
     According to various embodiments, the first colorimetric information may include at least any one of brightness or a tone of a skin area. The second colorimetric information may include at least any one of brightness or a tone of each of reference areas. 
     According to various embodiments, the processor  260  may be configured to capture a facial image again if reference areas are arranged differently from the rule. 
     According to various embodiments, the electronic device  200  may further include a display module coupled to the processor  260  and for displaying color information representing a skin color by the processor  260 . 
     According to various embodiments, the electronic device  200  may further include the communication module  220  coupled to the processor  260  and for transmitting color information to an external device (not illustrated) by the processor  260 . 
     According to various embodiments, the processor  260  may be configured to calibrate a facial image based on a skin color. 
       FIG. 3  is a diagram illustrating an operating method of the electronic device  200  according to various embodiments.  FIGS. 6, 7, 8, 9, 10 and 11  are diagrams for describing an operating method of the electronic device  200  according to various embodiments. 
     Referring to  FIG. 3 , at operation  310 , the electronic device  200  may execute an application. The application may include an application for determining a skin color of a facial image. In this case, the processor  260  may execute the application based on a request from a user, which is received through the input module  210 . For example, as illustrated in  FIG. 6 , the processor  260  may execute the application while displaying an initial execution screen  600  through the display module. 
     At operation  320 , the electronic device  200  may capture a facial image while executing the application. While the color palette  100  is overlapped with the face of a user, the electronic device  200  may capture the facial image from the face of the user along with the color palette  100 . The facial image may include at least a part of the face of the user and the color palette  100 . In this case, when the application is executed, the processor  260  may activate the camera module  230 . Furthermore, the processor  260  may capture the facial image through the camera module  230  based on a request from the user, which is received through the input module  210 . For example, as illustrated in  FIG. 7 , the processor  260  may display a guide screen  700  through the display module. For example, the guide screen  700  may include at least any one of a message  710  which enables a user to overlap the color palette  100  with a face and to manipulate the electronic device  200  or a soft button  720  for inputting a request to capture a facial image. 
     At operation  330 , the electronic device  200  may extract a skin area  821  and reference areas  823  from a facial image  800 . The electronic device  200  may extract the skin area  821  and the reference areas  823  from the facial image  800  based on the color palette  100 . At this time, the processor  260  may identify the central section  121  and color sections  123  of the color palette  100  in the facial image  800 . Furthermore, the processor  260  may extract the skin area  821  from the facial image  800  in accordance with the central section  121 , and may extract the reference areas  823  in accordance with the color sections  123 . For example, as illustrated in  FIG. 8 , the processor  260  may extract the skin area  821  and the reference areas  823  from the facial image  800 . 
     For example, an array of the reference areas  823  may correspond to an array of the color sections  123 . The reference areas (a′, b′, c′, d′, e′, and f)  823  may include six reference areas, that is, a first reference area (a′), a second reference area (d′), a third reference area (b′), a fourth reference area (f′), a fifth reference area (e′) and a sixth reference area (c′). The first reference area (a′), the second reference area (d′), the third reference area (b′), the fourth reference area (f′), the fifth reference area (e′) and the sixth reference area (c′) may correspond to the first color section (a), the second color section (d), the third color section (b), the fourth color section (f), the fifth color section (e) and the sixth color section (c), respectively. That is, the first reference area (a′), the second reference area (d′), the third reference area (b′), the fourth reference area (f), the fifth reference area (e′) and the sixth reference area (c′) may be counterclockwise arranged on the basis of the skin area (s′)  821 . 
       FIG. 4  is a diagram illustrating the operation of extracting the skin area  821  and the reference areas  823  in  FIG. 3 . 
     Referring to  FIG. 4 , at operation  431 , the electronic device  200  may convert a color space of the facial image  800 . For example, the processor  260  may convert the color space of the facial image  800  into CIE LAB. At operation  433 , the electronic device  200  may extract the skin area  821  and the reference areas  823  from the facial image  800 . Thereafter, the electronic device  200  may return to  FIG. 3 . 
     At operation  340 , the electronic device  200  may detect colorimetric information for the skin area  821  and the reference areas  823 . The processor  260  may detect first colorimetric information for the skin area  821 , and may detect second colorimetric information for the reference areas  823 . In this case, the first colorimetric information may include at least any one of brightness or a tone of the skin area  821 . The second colorimetric information may include at least any one of brightness or a tone of each of the reference areas  823 . 
     According to an embodiment, when converting the color space of the facial image  800  into the CIE LAB, the processor  260  may detect the first colorimetric information and the second colorimetric information based on the CIE LAB. The processor  260  may measure brightness of the skin area  821  based on reflectance L of the skin area  821 , and may measure brightness of each of the reference areas  823  based on reflectance L of each of the reference areas  823 . When converting the color space of the facial image  800  into the CIE LAB, the processor  260  may measure a tone of the skin area  821  based on chromaticity diagrams (a, b; b-1.1a) of the skin area  821 , and may measure a tone of each of the reference areas  823  based on chromaticity diagrams (a, b; b-1.1a) of each of the reference areas  823 . The reflectance L and chromaticity diagrams (a, b; b-1.1a) of the skin area  821  and the reference areas  823  may be measured as in [Table 3] and [Table 4] below. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 3 
               
               
                   
               
               
                   
                 Color name 
                 L 
                 a 
                 b 
                 b-1.1a 
                 indicator 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 a′ 
                 Light grayish yellow 
                 80.46 
                 0.87 
                 12.12 
                 11.163 
                 2.8 
               
               
                 b′ 
                 2Y04 
                 76.05 
                 11.59 
                 21.34 
                 8.591 
                 3.1 
               
               
                 c′ 
                 4Y06 
                 74.15 
                 10.66 
                 24.35 
                 12.624 
                 3.5 
               
               
                 d′ 
                 2R08 
                 67.83 
                 16.67 
                 24.98 
                 6.643 
                 4.0 
               
               
                 e′ 
                 3R11 
                 56.56 
                 19.5 
                 24.03 
                 2.58 
                 5.0 
               
               
                 f′ 
                 Black 
                 — 
                 — 
                 — 
                 — 
                 7.9 
               
               
                 s′ 
                 Skin 
                 78.97 
                 13.14 
                 18.44 
                 3.986 
                 2.9 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 4 
               
               
                   
               
               
                   
                 Color name 
                 L 
                 a 
                 b 
                 b-1.1a 
                 indicator 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 c′ 
                 4Y06 
                 74.15 
                 10.66 
                 24.35 
                 12.624 
                 Neutral 
               
               
                 a′ 
                 Light grayish yellow 
                 80.46 
                 0.87 
                 12.12 
                 11.163 
                 Neutral 
               
               
                 b′ 
                 2Y04 
                 76.05 
                 11.59 
                 21.34 
                 8.591 
                 Cool 
               
               
                 d′ 
                 2R08 
                 67.83 
                 16.67 
                 24.98 
                 6.643 
                 Cool 
               
               
                 e′ 
                 3R11 
                 56.56 
                 19.5 
                 34.03 
                 2.58 
                 Cool 
               
               
                 f′ 
                 Black 
                 — 
                 — 
                 — 
                 — 
                 Cool 
               
               
                 s′ 
                 Skin 
                 78.97 
                 13.14 
                 18.44 
                 3.986 
                 Cool 
               
               
                   
               
            
           
         
       
     
     At operation  350 , the electronic device  200  may determine a skin color of the skin area  821  based on the colorimetric information for the skin area  821  and the reference areas  823 . The processor  260  may determine the skin color based on the first colorimetric information for the skin area  821  with reference to the second colorimetric information for the reference areas  823 . At this time, the processor  260  may determine the skin color of the skin area  821  by comparing the first colorimetric information for the skin area  821  and the second colorimetric information for the reference areas  823 . The processor  260  may detect color information representing the skin color. 
       FIG. 5  is a diagram illustrating the operation of determining the skin color in  FIG. 3 . 
     Referring to  FIG. 5 , at operations  551  and  553 , the electronic device  200  may determine whether an array of the reference areas  823  complies with a predetermined rule. The rule may include at least any one of a brightness rule or a tone rule. As in Table 1, the brightness rule may indicate that in the color palette  100 , the reflectance L of the color sections (a, b, c, d, e, and f) is lower in order of the first color section (a), the third color section (b), the sixth color section (c), the second color section (d), the fifth color section (e), and the fourth color section (f). As in [Table 2], the tone rule may indicate that in the color palette  100 , the chromaticity diagrams (a, b; b-1.1a) are lower in order of the sixth color section (c), the first color section (a), the third color section (b), the second color section (d), the fifth color section (e), and the fourth color section (f). 
     According to an embodiment, at operation  551 , the processor  260  may determine whether an array of the reference areas  823  complies with the brightness rule. Thereafter, at operation  553 , the processor  260  may determine whether the array of the reference areas  823  complies with the tone rule. According to another embodiment, at operation  551 , the processor  260  may determine whether the array of the reference areas  823  complies with the tone rule. Thereafter, at operation  553 , the processor  260  may determine whether the array of the reference areas  823  complies with the brightness rule. The processor  260  may determine whether brightness of the reference areas (a′, b′, c′, d′, e′, f) is lower in order of the first reference area (a′), the third reference area (b′), the sixth reference area (c′), the second reference area (d′), the fifth reference area (e′), and the fourth reference area (f′). The processor  260  may determine whether tones of the reference areas (a′, b′, c′, d′, e′, f) are lower in order of the sixth reference area (c′), the first reference area (a′), the third reference area (b′), the second reference area (d′), the fifth reference area (e′), and the fourth reference area (f). 
     If it is determined that the array of the reference areas does not comply with the predetermined rule at operations  551  and  553 , the electronic device  200  may return to operation  320  in  FIG. 3 . For example, as illustrated in  FIG. 9 , the processor  260  may display a soft button  920  for inputting a request for the re-capturing of a facial image in the facial image  800  through the display module. Furthermore, when the soft button  920  is selected, the processor  260  may return to operation  320 . Accordingly, at operation  320 , the processor  260  may capture a facial image again and perform operations  330  to  350  again. 
     If it is determined that the array of the reference areas complies with the predetermined rule at operations  551  and  553 , at operation  555 , the electronic device  200  may compare the first colorimetric information and the second colorimetric information. The processor  260  may compare brightness of the skin area (s′)  821  and brightness of each of the reference areas (a′, b′, c′, d′, e′, and f′)  823 . For example, as in Table 3, the processor  260  may check that reflectance L of the skin area (s′) has a value between reflectance L of the first reference area (a′) and reflectance L of the third reference area (b′). The processor  260  may compare a tone of the skin area  821  and a tone of each of the reference areas  823 . For example, as in [Table 4], the processor  260  may check the chromaticity diagrams (a, b; b-1.1a) of the skin area (s′) have values between the chromaticity diagrams (a, b; b-1.1a) of the second reference area (d′) and the chromaticity diagrams (a, b; b-1.1a) of the third reference area (b′). 
     At operation  557 , the electronic device  200  may determine a skin color in the skin area  821 . At this time, the electronic device  200  may detect color information representing the skin color. The color information may include at least any one of an indicator indicative of the brightness of the skin area  821  or an indicator indicative of the tone of the skin area  821 . For example, the processor  260  may calculate a difference value between reflectance L of the skin area (s′) and reflectance L of the first reference area (a′) and a difference value between the reflectance L of the skin area (s′) and reflectance L of the third reference area (b′). Accordingly, the processor  260  may detect the indicator indicative of the brightness of the skin area  821  as an interval value between an indicator indicative of brightness of the first color section (a) corresponding to the first reference area (a′) and an indicator indicative of brightness of the third color section (b) corresponding to the third reference area (b′). For example, the processor  260  may calculate a difference value between the chromaticity diagrams (a, b; b-1.1a) of the skin area (s′) and the chromaticity diagrams (a, b; b-1.1a) of the second reference area (d′) and a difference value between the chromaticity diagrams (a, b; b-1.1a) of the skin area (s′) and the chromaticity diagrams (a, b; b-1.1a) of the third reference area (b′). Accordingly, the processor  260  may detect the indicator indicative of the tone of the skin area  821  based on an indicator indicative of a tone of the second color section (d) corresponding to the second reference area (d′) and an indicator indicative of a tone of the third color section (b) corresponding to the third reference area (b′). Thereafter, the electronic device  200  may return to  FIG. 3 . 
     According to a first embodiment, the electronic device  200  may transmit color information to an external device through the communication module  220 . For example, as illustrated in  FIG. 10 , the processor  260  may display a soft button  1020  for inputting a request for the transmission of color information in the facial image  800  through the display module. Thereafter, when the soft button  1020  is selected by a user, the processor  260  may transmit the color information to the external device. The external device may include at least any one of a server or another electronic device. For example, the external device may be operated by a cosmetic maker, etc. 
     According to a second embodiment, the electronic device  200  may calibrate a facial image based on color information. 
     According to a third embodiment, the electronic device  200  may display color information through the display module. For example, as illustrated in  FIG. 11 , the processor  260  may display an information display screen  1100  indicating color information through the display module. In this case, the information display screen  1100  may include at least any one of a soft button  1121  for inputting a request for the execution of a predetermined function based on color information or a soft button  1123  for inputting a request for the re-capturing of a facial image. For example, when the soft button  1121  is selected, the processor  260  may execute a predetermined function on at least any one of the facial image or the color information. The function may include at least any one of a function for calibrating a facial image, a function for storing at least any one of a facial image or color information, or a function for transmitting at least any one of a facial image or color information. For another example, when the soft button  1123  is selected, the processor  260  may return to operation  320  in  FIG. 3 . Accordingly, at operation  320 , the processor  260  may capture a facial image again, and may perform operations  330  to  350  again. 
     An operating method of the electronic device  200  according to various embodiments may include an operation of executing an application, an operation of capturing the facial image  800  including the color palette  100 , an operation of extracting the skin area  821  and the multiple reference areas  823  from the facial image  800  based on the color palette  100 , n operation of detecting first colorimetric information for the skin area  821  and second colorimetric information for the reference areas  823 , and an operation of determining a skin color of the skin area  821  by comparing the first colorimetric information and the second colorimetric information. 
     The color palette  100  according to various embodiments may include the central section  121  which is provided to define the skin area  821  and is an empty space or transparent and the multiple color sections  123  which are provided to define the reference areas  823 , arranged to surround the central section  121 , and arranged according to a rule determined based on at least one color characteristic. 
     According to various embodiments, the color characteristic may include at least any one of brightness or a tone of a color provided to each of the color sections  123 . 
     According to various embodiments, the color sections (a, b, c, d, e, and f)  123  may include the first color section (a), the second color section (d), the third color section (b), the fourth color section (f), the fifth color section (e) and the sixth color section (c) which are counterclockwise arranged. 
     According to various embodiments, brightness may be lower in order of the first color section (a), the third color section (b), the sixth color section (f), the second color section (d), the fifth color section (e), and the fourth color section (f). 
     According to various embodiments, a tone may be lower in order of the sixth color section (f), the first color section (a), the third color section (b), the second color section (d), the fifth color section (e), and the fourth color section (f). 
     According to various embodiments, the operation of determining a skin color may include an operation of determining whether the reference areas  823  are arranged identically with the rule based on the second colorimetric information for the reference areas  823  and an operation of determining a skin color of the skin area  821  by comparing the first colorimetric information and second colorimetric information if the reference areas  823  are arranged identically with the rule. 
     According to various embodiments, the first colorimetric information may include at least any one of brightness or a tone of the skin area  821 . The second colorimetric information may include at least any one of brightness or a tone of each of the reference areas  823 . 
     According to various embodiments, if the reference areas  823  are arranged differently from the rule, the process may return to the operation of capturing the facial image  800 . 
     According to various embodiments, the operation of determining a skin color may include an operation of displaying color information representing the skin color. 
     According to various embodiments, the operation of determining a skin color may include an operation of transmitting color information to an external device. 
     According to various embodiments, the operation of determining a skin color may include an operation of calibrating the facial image  800  based on the skin color. 
     According to various embodiments, the electronic device  200  can more accurately determine a skin color in a facial image  800  including the color palette  100  with reference to a color characteristic of the color palette  100 . In this case, a user can directly define a portion in which a skin color is to be identified by adjusting a location of the color palette in the face of the user. Accordingly, the electronic device  200  can determine a skin color with respect to various portions of the face. Accordingly, the user can check a change in the skin according to at least any one of time or a place. Accordingly, the user may consider the skin color determined by the electronic device  200  in selecting cosmetics. Moreover, the electronic device  200  can transmit, to an external device, information on a skin color of the user. Accordingly, consumer needs can be satisfied because a cosmetic maker having the external device uses the information to research and fabricate a product. Furthermore, the electronic device  200  can calibrate a facial image  800  based on a skin color of a user. Accordingly, the size of an error when the electronic device  200  calibrating the facial image  800  can be minimized. 
     The electronic device according to various embodiments disclosed in this document may be various types of devices. The electronic device may include a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device or home appliances, for example. The electronic device according to various embodiments of this document is not limited to the aforementioned devices. 
     Various embodiments of this document and the terms used in the embodiments are not intended to limit the technology described in this document to a specific embodiment, but should be construed as including various changes, equivalents and/or alternatives of a corresponding embodiment. Regarding the description of the drawings, similar reference numerals may be used in similar elements. An expression of the singular number may include an expression of the plural number unless clearly defined otherwise in the context. In this document, an expression, such as “A or B”, “at least one of A and/or B”, “A, B or C” or “at least one of A, B and/or C”, may include all of possible combinations of listed items together. Expressions, such as “a first,” “a second,” “the first” or “the second”, may modify corresponding elements regardless of its sequence or importance, and are used to only distinguish one element from the other element and do not limit corresponding elements. When it is described that one (e.g., a first) element is “(functionally or communicatively) connected to” or “coupled with” the other (e.g., a second) element, one element may be directly connected to the other element or may be connected to the other element through another element (e.g., a third element). 
     The term “module” used in this document may include a unit implemented as hardware, software or firmware, and may be interchangeably used with a term, such as logic, a logical block, a part, or a circuit. The module may be an integrated part or a minimum unit in which one or more functions are performed or a part thereof. For example, the module may be implemented as an application-specific integrated circuit (ASIC). 
     Various embodiments of this document may be implemented as software including one or more instructions stored in a storage medium (e.g., the memory  250 ) readable by a machine (e.g., the electronic device  200 ). For example, a processor (e.g., the processor  260 ) of the machine may invoke at least one of the one or more instructions stored in the storage medium, and may execute the instruction. This enables the machine to operate to perform at least one function based on the invoked at least one instruction. The one or more instructions may include a code generated by a complier or a code executable by an interpreter. The storage medium readable by the machine may be provided in the form of a non-transitory storage medium. In this case, the term “non-transitory” merely means that the storage medium is a tangible device and does not include a signal (e.g., electromagnetic waves). The term does not distinguish between a case where data is semi-permanently stored in the storage medium and a case where data is temporally stored in the storage medium. 
     According to various embodiments, each (e.g., a module or a program) of the aforementioned elements may include a single entity or a plurality of entities. According to various embodiments, one or more of the aforementioned components or steps may be omitted or one or more other components or steps may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, the integrated component may identically or similarly perform a function performed by a corresponding one of the plurality of components before one or more functions of each of the plurality of components. According to various embodiments, steps performed by a module, a program or another component may be executed sequentially, in parallel, iteratively or heuristically, or one or more of the steps may be executed in different order or may be omitted, or one or more other steps may be added.