Patent Publication Number: US-2022237811-A1

Title: Method for Testing Skin Texture, Method for Classifying Skin Texture and Device for Testing Skin Texture

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The disclosure claims the priority for Chinese Patent Application Priority No. “201910292616. 3.”, filed to the Chinese Patent Office on Dec. 4, 2019 and entitled “Method for Testing Skin Texture, Method for Classifying Skin Texture and Device for Testing Skin Texture”, which is incorporated herein in its entirety by reference. 
     TECHNICAL FIELD 
     The disclosure relates to computer vision processing technology, in particular to a method for testing skin texture, a method for classifying skin texture and a device for testing skin texture. 
     BACKGROUND 
     With development of society and improvement of living standards, people pay increasing attention to personal images, especially to skins. Generally speaking, for identifying some common defective skin texture, conventional manual observation is required, but for testing the skin texture more accurately, scientific means are required. At present, bioelectrical impedance analysis is mainly used to test skin texture, which evaluates skin texture by measuring electrical impedance features of the skins. However, the method can test a small number of skin texture features, such as moisture and fat secretion of the skins. In addition, a tester has to make contact with the skins directly, and therefore, a testing result is greatly influenced by contact impedance, and testing precision is poor. Moreover, the method requires additional professional hardware apparatuses, most of which can be operated by professionals and require users to complete testing in specific testing sites, and application groups and application scenes are limited to some extent consequently. These hardware apparatuses involve high cost, and therefore are inconvenient to apply and promote in practice. 
     SUMMARY 
     According to one aspect of one of the embodiments of the disclosure, the method for testing skin texture is provided. The method includes: a face image is acquired; a face complexion region and face feature points in the face image are acquired; and a face skin texture feature from the face image is acquired according to the face complexion region and the face feature points. 
     In at least one alternative embodiment, the step that a face complexion region and face feature points in the face image are acquired includes: the face complexion region is acquired by using a complexion testing algorithm. 
     In at least one alternative embodiment, the method further includes: five sense organ regions of the face image are removed according to the face feature points, to acquire the face complexion region. 
     In at least one alternative embodiment, the method further includes: the face complexion region is processed by using a morphological algorithm, to expand the five sense organ regions removed. 
     In at least one alternative embodiment, the face skin texture feature includes at least one of a complexion, a freckle, a pore, a wrinkle, under-eye dark circles and smoothness. 
     In at least one alternative embodiment, the step that a face skin texture feature from the face image is acquired according to the face complexion region and the face feature points includes: a detailed diagram of the face complexion region is acquired by using a high pass algorithm. 
     In at least one alternative embodiment, the method further includes: face direction information is acquired according to the face feature points. 
     In at least one alternative embodiment, when the face skin texture feature includes a freckle and/or a pore, the step that a face skin texture feature from the face image is acquired according to the face complexion region and the face feature points further includes: a testing result of the freckle and/or the pore in the detailed diagram is acquired by using a first preset algorithm; and the freckle and/or the pore is distinguished according to shape features. 
     In at least one alternative embodiment, when the face skin texture feature includes the smoothness, the method includes: the smoothness is acquired through a gray level co-occurrence matrix algorithm according to the testing result of the freckle and/or the pore. 
     In at least one alternative embodiment, when the face skin texture feature includes a wrinkle, the step that a face skin texture feature from the face image is acquired according to the face complexion region and the face feature points further includes: a testing result of the wrinkle in the detailed diagram is acquired by using a second preset algorithm; and a type of the wrinkle is determined according to face direction information and the face feature points. 
     In at least one alternative embodiment, when the face skin texture feature includes under-eye dark circles, a face skin texture feature from the face image according to the face complexion region and the face feature points includes: according to eye feature points in the face feature points, an upper Bezier curve and a lower Bezier curve in the face image are drew, the under-eye dark circles are located, and a testing result of the under-eye dark circles in the face image is acquired by determining a difference between a brightness mean of positions of the under-eye dark circles and a surrounding region. 
     In at least one alternative embodiment, the method for testing skin texture further includes: the face image is enhanced to acquire an enhanced face image. 
     In at least one alternative embodiment, the step that the face image is enhanced to acquire an enhanced face image includes: brightness of the face image are acquired; and contrast of a low gray level region in the face image is enhanced to acquire the enhanced face image. 
     In at least one alternative embodiment, the step that brightness of the face image are acquired includes: the face image is converted into an image in a YUV format through a color conversion algorithm, and a Y channel image in the image in the YUV format is extracted to acquire the brightness of the face image. 
     According to one aspect of one of the embodiments of the disclosure, the method for classifying skin texture is provided. The method includes: a face skin texture feature is acquired by using the method for testing skin texture above; and face skin texture is classified into different classes by using a machine learning method according to the face skin texture feature. 
     In at least one alternative embodiment, the method includes: corresponding retouching parameters are set according to the different classes of the face skin texture. 
     In at least one alternative embodiment, the method is applied to an electronic device with a video calling or photographing function. 
     According to another aspect of one of the embodiments of the disclosure, the device for testing skin texture is provided. The device includes: an image collection element configured to acquire a face image; an acquisition element configured to acquire a face complexion region and face feature points in the face image; and a skin texture testing element configured to test a face skin texture feature from the face image according to the face complexion region and the face feature points. 
     In at least one alternative embodiment, the acquisition element includes a complexion acquisition element configured to acquire the face complexion region in the face image through a complexion testing algorithm. 
     In at least one alternative embodiment, the complexion acquisition element is further configured to remove five sense organ regions of the face image according to the face feature points, to acquire the face complexion region. 
     In at least one alternative embodiment, the complexion acquisition element is further configured to process the face complexion region by using a morphological algorithm, to expand the five sense organ regions removed. 
     In at least one alternative embodiment, the face skin texture feature includes at least one of a complexion, a freckle, a pore, a wrinkle, under-eye dark circles and smoothness. 
     In at least one alternative embodiment, the skin texture testing element is further configured to acquire a detailed diagram of the face complexion region by using a high pass algorithm. 
     In at least one alternative embodiment, the skin texture testing element is further configured to acquire face direction information according to the face feature points. 
     In at least one alternative embodiment, the skin texture testing element includes a freckle and pore testing element, and the freckle and pore testing element is configured to acquire a testing result of a freckle and/or a pore in the detailed diagram by using a first preset algorithm, and distinguish the freckle and/or the pore according to shape features. 
     In at least one alternative embodiment, the skin texture testing element includes the smoothness testing element configured to acquire smoothness through a gray level co-occurrence matrix algorithm according to the testing result of the freckle and/or the pore. 
     In at least one alternative embodiment, the skin texture testing element includes a wrinkle testing element configured to acquire a testing result of a wrinkle in the detailed diagram by using a second preset algorithm, and determine a type of the wrinkle according to face direction information and the face feature points. 
     In at least one alternative embodiment, the skin texture testing element includes an under-eye dark circles testing element configured to draw, according to eye feature points in the face feature points, an upper Bezier curve and a lower Bezier curve in the face image, locate the under-eye dark circles, and acquire a testing result of the under-eye dark circles in the face image by determining a difference between a brightness mean of positions of the under-eye dark circles and a surrounding region. 
     In at least one alternative embodiment, the device further includes an image enhancement element configured to enhance the face image to acquire an enhanced face image. 
     In at least one alternative embodiment, the image enhancement element includes a brightness acquiring unit configured to acquire brightness of the face image; and a contrast enhancement unit configured to enhance contrast of a low gray level region in the face image to acquire the enhanced face image. 
     In at least one alternative embodiment, the brightness acquiring unit is further configured to convert the face image into an image in a YUV format through a color conversion algorithm, and extract a Y channel image in the image in the YUV format to acquire the brightness of the face image. 
     According to another aspect of one of the embodiments of the disclosure, an electronic device is provided. The electronic device includes: a processor, and a memory configured to store an executable command of the processor, wherein the processor is configured to execute the executable command to implement the method for testing skin texture according to any one described above. 
     According to another aspect of one of the embodiments of the disclosure, a storage medium is provided. The storage medium includes a stored program, wherein when being run, the program controls a device where the storage medium is located to implement the method for testing skin texture according to any one described above. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings described herein are used for providing further understanding of the disclosure and constitute part of the disclosure. Schematic embodiments of the disclosure and descriptions thereof are used to explain the disclosure, but not constitute an improper limit to the disclosure. In the accompanying drawings: 
         FIG. 1  is a flowchart of an optional method for testing skin texture according to one of embodiments of the disclosure; 
         FIG. 2  is a flowchart of an optional method for classifying skin texture according to one of the embodiments of the disclosure; 
         FIG. 3  is a structural block diagram of an optional device for testing skin texture according to one of the embodiments of the disclosure; and 
         FIG. 4  is a structural block diagram of an optional electronic device according to one of the embodiments of the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     In order to enable a person of ordinary skill in the art to better understand solutions of the disclosure, the following clearly and completely describe the technical solutions in the embodiments of the disclosure with reference to the accompanying drawings in the embodiments of the disclosure. Apparently, the described embodiments are some rather than all of the embodiments of the disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the disclosure shall fall within the protection scope of the disclosure. 
     It should be noted that the terms “first”, “second”, etc. in the specification and claims of the disclosure and the above accompanying drawings are used to distinguish similar objects, but are not necessarily used to describe a specific sequence or a precedence order. It should be understood that data used in this way can be interchanged under appropriate circumstances, such that the embodiment of the disclosure described herein may be implemented in a sequence other than those illustrated or described herein. In addition, terms “including”, “having”, and any variations thereof are intended to cover non-exclusive inclusions, for example, processes, methods, systems, products, or devices that contain a series of steps or units need not be limited to those clearly listed steps or units, but may include other steps or units not explicitly listed or inherent to the processes, methods, products, or devices. 
     The embodiments of the disclosure may be applied to compute systems/servers that may operate with numerous other general purpose or special purpose computing system environments or configurations. Examples of well-known computing systems, environments, and/or configurations suitable for use with the computer systems/servers include, but are not limited to, personal computer systems, handheld or laptop devices, microprocessor-based systems, programmable consumer electronics products, small computer systems, large computer systems, distributed cloud computing technology environments including any of the above systems, etc. 
     The computer systems/servers may be described in the general context of computer system executable instructions (such as program elements) executed by the computer systems. Generally, program elements may include routines, programs, object programs, components, logic and data structures, etc., which perform specific tasks or implement specific abstract data types. The computer systems/servers may be implemented in the distributed cloud computing environments, and tasks are performed by remote processing devices linked through a communication network. In the distributed cloud computing environments, the program elements may be located on local or remote computing system storage media including storage devices. 
     The following describes the disclosure through detailed embodiments. 
     According to one aspect of the disclosure, a method for testing skin texture is provided.  FIG. 1  is a flowchart of an optional method for testing skin texture according to one of embodiments of the disclosure. As shown in  FIG. 1 , the method includes the following steps: 
     S 10 : a face image is acquired; 
     S 12 : a face complexion region and face feature points in the face image are acquired; and 
     S 14 : a face skin texture feature from the face image is acquired according to the face complexion region and the face feature points. 
     In this embodiment of the disclosure, the method includes the following steps: the face image is acquired; the face complexion region and the face feature points in the face image are acquired; and the face skin texture feature from the face image is acquired according to the face complexion region and the face feature points. In this way, the face skin texture feature may be tested on the basis of the face image, and more skin texture features may be tested as needed without increasing a cost and a size of hardware, thus improving testing precision. 
     Each step above is described in detail below. 
     S 10 , the face image is acquired. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the face image may be acquired through an image collection element, the image collection element may be an independent camera head or a camera head integrated on an electronic device, such as an independent RGB camera, or a built-in camera of an on-board electronic device (including but not limited to a touch screen, a navigator, etc.), a mobile phone, a tablet computer, a desktop computer, a skin texture testing instrument, etc. 
     S 12 : the face complexion region and the face feature points in the face image are acquired. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the face complexion region in the face image may be acquired through a complexion testing algorithm. For example, the face image may be converted into a YCbCr color space through the complexion testing algorithm, then a CrCb value of each pixel point is put into an elliptic statistical model acquired according to skin pixels, if a coordinate of the CrCb is located in the elliptic statistical model, the pixel points is determined as a complexion, through which the face complexion region is acquired. The face feature points may be acquired by a supervised descent method (SDM) algorithm. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, in order to acquire a more accurate face complexion region, five sense organ regions in the face image may be removed according to the face feature points, to acquire the face complexion region. In addition, a morphological algorithm (for example, a corrosion expansion algorithm) may also be utilized to process the face complexion region, so as to expand the removed five sense organ regions, thus avoiding the problem that the five sense organ regions are not completely removed and remain due to image offset. 
     S 14 : the face skin texture feature from the face image is acquired according to the face complexion region and the face feature points. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the face skin texture feature includes at least one of a complexion, a freckle, a pore, a wrinkle, under-eye dark circles and smoothness. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, when the face skin texture feature includes a freckle and/or a pore, the step that the face skin texture feature from the face image is acquired according to the face complexion region and the face feature points includes: a detailed diagram of the face complexion region is acquired by using a high pass algorithm, a testing result of the freckle and/or the pore in the detailed diagram is acquired by using a first preset algorithm (for example, a local adaptive threshold algorithm), the testing result including at least one of a position, the number and an area; and the freckle and/or the pore is distinguished according to shape features, wherein shape features of the pore are in a shape similar to a circle with a generally small area, and shape features of the freckle are in a shape with a relatively large area. Preferably, after the testing result of the freckle and/or the pore in the detailed diagram is acquired by using the local adaptive threshold algorithm, isolated points of the freckle and/or the pore may be removed by using the morphological algorithm (for example, the corrosion expansion algorithm) to eliminate influence of noise, and a connected domain algorithm is used to eliminate wrong points with an abnormal shape or an excessively large area in an initial testing result. Preferably, the above step may be implemented in the face complexion region with the five sense organ regions removed, so as to reduce a false testing rate of the freckle and/or the pore. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, after the testing result of the freckle and/or the pore is acquired, the smoothness may be acquired through a gray level co-occurrence matrix algorithm according to the testing result of the freckle and/or the pore. For example, parameters such as energy, entropy, contrast and inverse difference moment at degree, 45 degrees, 90 degrees and 135 degrees are calculated through the gray level co-occurrence matrix algorithm, and then the smoothness feature is acquired with the 16 parameters. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, when the face skin texture feature includes a wrinkle, a face skin texture feature from the face image is acquired according to the face complexion region and the face feature points further includes: a detailed diagram of the face complexion region is acquired by using a high pass algorithm, face direction information is acquired according to the face feature points, a testing result of the wrinkle in the detailed diagram is acquired by using a second preset algorithm, and a type of the wrinkle is determined according to the face direction information and the face feature points. The testing result includes at least one of a position, the number and an area. Preferably, after the second preset algorithm is used to acquire the testing result of the wrinkle in the detailed diagram, the morphological algorithm and the connected domain algorithm are used to eliminate some objects which obviously do not belong to the wrinkle. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the steps that the testing result of the wrinkle in the detailed diagram of the wrinkle is acquired by using the second preset algorithm, and a type of the wrinkle is determined according to the face direction information and the face feature points may include: a position of a wrinkle is acquired by using the local adaptive threshold algorithm, a wrinkle which is generally in a horizontal direction is determined as a periocular wrinkle according to the face feature points and the face direction information, a position of a wrinkle is acquired by using a Canny edge extraction algorithm, and according to the face feature points and the face direction information, a wrinkle which is generally in a horizontal direction is determined as a forehead wrinkle and a wrinkle which is generally in a diagonal direction is determined as a nasolabial wrinkle. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, when the face skin texture feature includes under-eye dark circles, the step that a face skin texture feature from the face image is acquired according to the face complexion region and the face feature points further includes: according to eye feature points in the face feature points, an upper Bezier curve and a lower Bezier curve are drew in the face image, testing regions of the under-eye dark circles are located, a difference between a brightness mean of the testing regions of the under-eye dark circles and a surrounding region is calculated and severity of the under-eye dark circles is determined. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, after the step S 10  acquiring the face image, the method further includes step S 11 : the face image is enhanced to acquire an enhanced face image. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the step that the face image is enhanced to acquire an enhanced face image includes: brightness of the face image are acquired through a third preset algorithm; and contrast of a low gray level region is enhanced in the face image to acquire an enhanced face image. Therefore, details of the face image in dark light may be enhanced. Preferably, the face skin texture feature may be acquired from the enhanced face image to acquire a more accurate testing result. A low gray level region in the face image may be expanded through methods including but not limited to logarithmic transformation, histogram equalization, exponential transformation, etc. 
     Specifically, the step that brightness of the face image are acquired through a third preset algorithm includes: the face image is converted into an image in a YUV format through a color conversion algorithm, and a Y channel image in the image in the YUV format is extracted to acquire the brightness of the face image. 
     It is certain that those skilled in the art know that before or after the face image is enhanced to acquire the enhanced face image, the method may also include a face frame is tested and the image is scaled according to a tested size of the face frame, so as to acquire the face image with a required size. 
     Through the above steps, face skin texture testing may be realized, and the tested skin texture feature may include the freckle, the pore, the smoothness, the wrinkle, the under-eye dark circles, etc., and the testing precision may be improved without increasing the cost and the size of the hardware. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, after various skin texture features are tested, skin texture may also be evaluated by combining with the face complexion region. For example, in the case of the freckle, an area ratio of the freckle to the face complexion regions may be used as an index to evaluate severity of the freckle. 
     According to another aspect of one of embodiments of the disclosure, a method for classifying skin texture is further provided.  FIG. 2  is a flowchart of an optional method for classifying skin texture according to one of embodiments of the disclosure. As shown in  FIG. 2 , the method includes the following steps: 
     S 20 : a face skin texture feature is acquired by using the method for testing skin texture above; and 
     S 22 : face skin texture is classified into different classes by using a machine learning method according to the face skin texture feature. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the machine learning method may use a support vector machine or a perceptron. Specifically, the machine learning method may acquire an optimal classification function by training samples, wherein a face skin texture feature of each sample includes at least one of a complexion, a freckle, a pore, a wrinkle, under-eye dark circles and smoothness. 
     In one of the embodiments of the disclosure, the face skin texture feature is acquired through the above steps, that is, the above method for testing skin texture. According to the face skin texture feature, face skin texture is classified into different classes by using the machine learning method. In addition to testing of the face skin texture feature, the face skin texture may be classified into different classes, which facilitates supplying of nursing advice and recommending of suitable skin care products to different users or realizing of intelligent retouching. 
     With regard to intelligent retouching, in an application scene of one of the embodiments of the disclosure, corresponding retouching parameters may be set according to the different classes of the face skin texture, to realize intelligent retouching. For example, if a skin of somebody has many pores, wrinkles and freckles, and is relatively rough, face skin texture of the person is defined as bad, corresponding retouching parameters may be set accordingly, and for example, higher skin smoothing intensity in the retouching parameters may be set. On the contrary, if a skin of somebody has fewer pores, wrinkles and freckles, and is smooth, face skin texture of the person is defined as good, corresponding retouching parameters may be set accordingly, for example, lower skin smoothing intensity in the retouching parameters may be set, thereby guaranteeing that retouching parameters of each person are optimized, achieving a natural retouching effect and realizing intelligent retouching. The intelligent retouching technology realized by setting the corresponding retouching parameters according to the different classes of the face skin texture may be carried on an electronic device with a function such as video calling or photographing, such as an on-board electronic device (including but not limited to a touch screen, a navigator, etc.), a mobile phone, a digital camera, a tablet computer, a desktop computer, a skin texture testing instrument, etc. In an application environment, for example, in a car with an auxiliary driving function, especially in a car with an automatic driving function, because people don&#39;t need to operate a steering wheel when driving, people may have video chats, video conferences, photo taking, etc. in spare time, and by carrying the intelligent retouching technology on the above on-board electronic device with the video calling or the photo taking function, experience feeling of users may be improved. 
     According to another aspect of one of the embodiments of the disclosure, a device for testing skin texture is further provided.  FIG. 3  is a structural block diagram of an optional device for testing skin texture according to one of embodiments of the disclosure. As shown in  FIG. 3 , the device for testing skin texture includes: 
     an image collection element  30  is configured to acquire a face image. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the image collection element may be an independent camera head or a camera head integrated on an electronic device, such as an independent RGB camera, or a built-in camera of an electronic device such as a mobile phone, a tablet computer, a desktop computer and a skin texture testing instrument. 
     An acquisition element  32  is configured to acquire a face complexion region and face feature points in the face image. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the acquisition element  34  includes a complexion acquisition element and a feature points acquisition element. The complexion acquisition element is configured to acquire the face complexion region in the face image through a complexion testing algorithm. For example, the face image may be converted into a YCbCr color space through the complexion testing algorithm, then a CrCb value of each pixel point is put into an elliptic statistical model acquired according to skin pixels, if a coordinate of the CrCb is located in the elliptic statistical model, the pixel point is determined as a complexion, through which the face complexion region is acquired. The face feature points may be acquired by a supervised descent method (SDM) algorithm. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, in order to acquire a more accurate face complexion region, the complexion acquisition element is configured to remove five sense organ regions in the face image according to the face feature points, to acquire the face complexion region. In addition, the complexion acquisition element is configured to utilize a morphological algorithm (for example, a corrosion expansion algorithm) to process the face complexion region, so as to expand the removed five sense organ regions, thus avoiding the problem that the five sense organ regions are not completely removed and remain due to image offset. 
     A skin texture testing element  34  is configured to acquire a face skin texture feature from the face image according to the face complexion region and the face feature points. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the face skin texture feature includes at least one of a complexion, a freckle, a pore, a wrinkle, under-eye dark circles and smoothness. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the skin texture testing element  34  includes a freckle and pore testing element  340 . The freckle and pore testing element  340  is configured to acquire a detailed diagram of the face complexion region by using a high pass algorithm, acquire a testing result of the freckle and/or the pore in the detailed diagram by using a first preset algorithm (for example, a local adaptive threshold algorithm), the testing result including at least one of a position, the number and an area; and distinguish the freckle and/or the pore according to shape features, wherein shape features of the pore are in a shape similar to a circle with a generally small area, and shape features of the freckle are in a shape with a relatively large area. Preferably, after the testing result of the freckle and/or pore in the detailed diagram is acquired by using the local adaptive threshold algorithm, isolated points of the freckle and/or pore may be removed by using the morphological algorithm (for example, the corrosion expansion algorithm) to eliminate influence of noise, and a connected domain algorithm is used to eliminate wrong points with an abnormal shape or an excessively large area in an initial testing result. Preferably, the above step may be implemented in the face complexion region with the five sense organ regions removed, so as to reduce a false testing rate of the freckle and/or the pore. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the skin texture testing element  34  includes a smoothness testing element  342  which is configured to acquire, after the testing result of the freckle and/or the pore is acquired, the smoothness through a gray level co-occurrence matrix algorithm according to the testing result of the freckle and/or the pore. For example, parameters such as energy, entropy, contrast and inverse difference moment at 0 degree, 45 degrees, 90 degrees and 135 degrees are calculated through the gray level co-occurrence matrix algorithm, and then the smoothness feature is acquired with the 16 parameters. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the skin texture testing element  34  includes a wrinkle testing element  344 . The wrinkle testing element  344  is configured to acquire a detailed diagram of the face image by using a high pass algorithm, acquire face direction information according to the face feature points, acquire a testing result of the wrinkle in the detailed diagram by using a second preset algorithm, the testing result including at least one of a position, the number and an area, and determine a type of the wrinkle according to the face direction information and the face feature points. Preferably, after the second preset algorithm is used to acquire the testing result of the wrinkle in the detailed diagram, the morphological algorithm and the connected domain algorithm are used to eliminate some objects which obviously do not belong to the wrinkle. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the steps that the testing result of the wrinkle in the detailed diagram of the wrinkle is acquired by using the second preset algorithm, and a type of the wrinkle is determined according to the face direction information and the face feature points may include: a position of a wrinkle is acquired by using the local adaptive threshold algorithm, mark a wrinkle which is generally in a horizontal direction is determined as a periocular wrinkle according to the face direction information and the face feature points, acquire a position of a wrinkle by using a Canny edge extraction algorithm, and according to the face direction information and the face feature points, a wrinkle which is generally in a horizontal direction is marked as a forehead wrinkle and a wrinkle which is generally in a diagonal direction is marked as a nasolabial wrinkle. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the skin texture testing element  34  includes an under-eye dark circle testing element  346 . The under-eye dark circle testing element  346  is configured to draw, according to eye feature points in the face feature points, an upper Bezier curve and a lower Bezier curve in the face image, locate testing regions of the under-eye dark circles, calculate a difference between a brightness mean of the testing regions of the under-eye dark circles and a surrounding region and determine severity of the under-eye dark circles. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the device for testing skin texture  3  further includes an image enhancement element  31  configured to enhance the face image to acquire an enhanced face image. 
     In at least one alternative embodiment, in one of the embodiments of the disclosure, the image enhancement element  31  includes a brightness acquiring unit  310  and a contrast enhancement unit  312 . The brightness acquiring unit  310  is configured to acquire brightness of the face image through a third preset algorithm. The contrast enhancement unit  312  is configured to enhance contrast of a low gray level region in the face image to acquire the enhanced face image. Therefore, details of the face image in dark light may be enhanced. Preferably, the face skin texture feature may be acquired from the enhanced face image to acquire a more accurate testing result. A low gray level region in the face image may be expanded through methods including but not limited to logarithmic transformation, histogram equalization, exponential transformation, etc. 
     Specifically, the step that brightness of the face image are acquired through a third preset algorithm includes: the face image is converted into an image in a YUV format through a color conversion algorithm, and a Y channel image in the image in the YUV format is extracted to acquire the brightness of the face image. 
     It is certain that those skilled in the art know that before or after the face image is enhanced to acquire the enhanced face image, the method may also include the image is scaled to acquire the face image with a required size. 
     In one of the embodiments of the disclosure, the above elements, that is, the image collection element  30  is configured to acquire the face image, the acquisition element  34  is configured to acquire the face complexion region and the face feature points in the face image; and the skin texture testing element  36  is configured to test the face skin texture feature of the face image according to the face complexion region and the face feature points. In this way, various face skin texture features may be tested on the basis of the face image, and more skin texture features may be tested as needed without increasing a cost and a size of hardware, thus improving testing precision. 
     According to another aspect of one of the embodiments of the disclosure, an electronic device is further provided. The electronic device  40  includes a processor  400  and a memory  402  configured to store an executable command of the processor  400 , wherein the processor  400  is configured to execute the executable command to implement the method for testing skin texture according to any one described above. 
     According to another aspect of one of the embodiments of the disclosure, a storage medium is further provided. The storage medium includes a stored program, wherein when being run, the program controls a device where the storage medium is located to implement the method for testing skin texture according to any one described above. 
     In the above embodiments of the disclosure, descriptions of the embodiments have their own emphasis. For part not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments. 
     It should be understood that in several embodiments provided by the disclosure, technical contents disclosed may be implemented in other manners. The device embodiments described above are merely schematic. For example, unit division may be a logical function division and may have other division manners during actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. On the other hand, the shown or discussed coupling or direct coupling or communication connection with each other may be indirect coupling or communication connection through some interfaces, units or elements, and may be in electrical or other forms. 
     The units described as separated parts may or may not be physically separated, and the parts displayed as units may or may not be physical units, that is, they may be located in one place or distributed to multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of a solution of this embodiment. 
     In addition, functional units in the embodiments of the disclosure may be integrated into one processing unit, or each unit may be physically present separately, or two or more units may be integrated into one unit. The above integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units. 
     If the integrated units are implemented in the form of the software functional units and sold or used as independent products, they may be stored in a computer readable storage medium. Based on such understanding, a technical solution of the disclosure may be embodied in the form of software products in essence or in part that contributes to the prior art or in part or whole, the computer software products are stored in the storage medium, and include several instructions to make one piece of computer equipment (which may be a personal computer, a server, a network device, etc.) execute whole or partial steps of the method of each embodiment of the disclosure. The foregoing storage medium includes a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk drive, a diskette or optical disk, etc., which may store program codes. 
     The described above is merely a preferred embodiment of the disclosure. It shall be noted that for those of ordinary skill in the art, they may make several improvements and polishing on the premise without deviating from a principle of the disclosure, and these improvements and polishing shall be integrated as falling within the protection scope of the disclosure. 
     INDUSTRIAL APPLICABILITY 
     The face image is acquired, the face complexion region and the face feature points in the face image are acquired; and the face skin texture feature of the face image is acquired according to the face complexion region and the face feature points. The face skin texture feature may be tested on the basis of the face image, and more skin texture features may be tested as needed without increasing the cost and the size of the hardware, thus improving the testing precision, and further solving the problems of a small number of skin texture features tested, poor testing precision, and a high cost and a large size of hardware in the prior art.