WO2022233059A1 - Sensor unit and camera system for skin characteristics analysis - Google Patents

Sensor unit and camera system for skin characteristics analysis Download PDF

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Publication number
WO2022233059A1
WO2022233059A1 PCT/CN2021/092226 CN2021092226W WO2022233059A1 WO 2022233059 A1 WO2022233059 A1 WO 2022233059A1 CN 2021092226 W CN2021092226 W CN 2021092226W WO 2022233059 A1 WO2022233059 A1 WO 2022233059A1
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color filter
pixels
color
light
signals
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PCT/CN2021/092226
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French (fr)
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Hajime Numata
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Guangdong Oppo Mobile Telecommunications Corp., Ltd.
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Priority to PCT/CN2021/092226 priority Critical patent/WO2022233059A1/en
Publication of WO2022233059A1 publication Critical patent/WO2022233059A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G06T7/0012—Biomedical image inspection
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10024—Color image
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30004—Biomedical image processing
    • G06T2207/30088—Skin; Dermal

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  • a camera including a red color filter For example, it is necessary to prepare a camera including a red color filter, take a picture of a facial skin to acquire a first image, prepare a camera including a blue color filter, take a picture of the skin to acquire a second image for analysis.
  • the present disclosure has been made in consideration of the above situation, and thus the present disclosure provides a sensor unit and a camera system for skin characteristics analysis of small size and low cost.
  • an image sensor having a plurality of image sensor pixels and outputting color signals
  • a bandpass filter configured to transmit a light having a certain wavelength band to the color filter, arranged on the color filter,
  • the image sensor configured to output the color signals including color signals of light filtered through the red color filter pixels and color signals of light filtered through the blue color filter pixels, having the certain wavelength band.
  • a camera system for skin characteristics analysis comprising:
  • a color filter including red color filter pixels and blue color filter pixels, arranged on the image sensor;
  • an image processing unit configured to receive the color signals from the image sensor, perform a predetermined process for the color signals, and output image signals including color signals of light filtered through the red color filter pixels and color signals of light filtered through the blue color filter pixels, having the certain wavelength band.
  • Fig. 1 shows photographs illustrating characteristics of a facial skin
  • FIG. 2 shows photographs illustrating cross sectional views of the skin shown in Fig. 1;
  • Fig. 3 is a graph illustrating a relative reflectance characteristic rate of melanin and hemoglobin included in a skin
  • Fig. 4 is a block diagram schematically showing an overall arrangement of a camera system according to one embodiment of the present disclosure
  • Fig. 5 is a perspective view illustrating a configuration including a green-cut filter and an image sensor with a red/blue color filter of the camera system of one embodiment of the present disclosure
  • Fig. 6 is a plan view illustrating a pixel array pattern of the red/blue color filter
  • Fig. 7 is a plan view illustrating a pixel array pattern of a color filter of Bayer arrangement
  • Fig. 8 is a graph illustrating transmittances of a red color light and a blue color light
  • Fig. 10A is a graph illustrating a transmittance of a light, filtered by a bandpass filter, such as a green-cut filter;
  • Fig. 10B is a graph illustrating sensitivities of a red color light and a blue color light
  • a color image 4 illustrates the skin under a red light (ex. 650 nm) . It shows a flat, smooth and clear image of the skin where wrinkles, freckles and/or stains are not obvious in comparison with the color images 1 and 2.
  • Fig. 2 illustrates cross sectional views of the same skin under the above three light conditions.
  • a color image 11 illustrates a cross sectional view of the skin under the blue light (ex. 450 nm) . It shows that the blue light reflects at a surface of the skin. The wrinkles, freckles and/or stains being on the surface of the skin, they are very obvious.
  • a color image 12 illustrates a cross sectional view of the skin under the green light (ex. 550 nm) . It shows that the green light reflects at a middle layer from the surface to a middle depth when compared with the color image 11. The wrinkles, freckles and/or stains are not obvious in comparison with the color image 11.
  • Fig. 3 illustrates characteristics of a skin, showing relative reflectance characteristic rates of hemoglobin and melanin, depending on wavelengths of a light.
  • Hemoglobin has higher reflectance than melanin, and it has low reflectance in a certain band width, such as 500 to 600 (nm) . As a result, melanin stands out in this bandwidth.
  • a camera system 101 comprises an optical system 111, a sensor unit 112 including an image sensor, a color filter and a bandpass filter, and an image processing unit 113.
  • the image processing unit 113 receives the red and blue color signals 122, performs a certain process, for example, combines an image under a red color light and an image under a blue color light, performs predetermined processes such as white balance and color correction, and outputs color image signals 123 including red color image signals and blue color image signals.
  • the camera system 101 is used for both still and moving images.
  • the color filter 21 and the bandpass filter 22 of the sensor unit 112 are shown in a perspective view of Fig. 5.
  • the color filter 21 is arranged on the image sensor (which is not shown) , and the bandpass filter 22 is arranged on the color filter 21.
  • the bandpass filter 22 may be, for example, externally arranged on the color filter 21.
  • a conventional color filter 23 of a Bayer arrangement includes red color filter pixels, green color filter pixels and blue color filter pixels, as shown in Fig. 7.
  • red color filter pixels and blue color filter pixels are needed, as described above.
  • red color light has a certain level of sensitivity in a wavelength band between 570 to 590 (nm) . It is thus necessary to cut off this band between 570 to 590 (nm) of red color light.
  • the sensitivities of a blue color light and a red color light shown in Fig. 10B can be acquired by the color filter 21.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Quality & Reliability (AREA)
  • Computer Vision & Pattern Recognition (AREA)
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Abstract

There is provided a sensor unit for skin characteristics analysis, the sensor unit having, an image sensor having a plurality of image sensor pixels and outputting color signals; a color filter, including red color filter pixels and blue color filter pixels, arranged on the image sensor; and a bandpass filter, configured to transmit a light having a certain wavelength band to the color filter, arranged on the color filter, wherein the image sensor, configured to output the color signals including color signals of light filtered through the red color filter pixels and color signals of light filtered through the blue color filter pixels, having the certain wavelength band.

Description

SENSOR UNIT AND CAMERA SYSTEM FOR SKIN CHARACTERISTICS ANALYSIS TECHNICAL FIELD
Various example embodiments relate to a sensor unit and a camera system for skin characteristics analysis, and more specifically, to a sensor unit and a camera system providing an image illustrating different characteristics of a facial skin.
BACKGROUND
In recent years, color imaging technologies have been developed and widely used in, for example, mobile phones. In line with progresses in high-speed/large-capacity data communication or high-speed microprocessors, various functions, such as high color resolution, are required.
However, the conventional color imaging technologies are unable to provide a skin characteristics analysis system of small size and low cost.
In a conventional camera system, when analyzing facial skin characteristics, it is necessary to perform a lot of procedures using plural devices, which has led to an increase in a size of the devices and an increase in cost.
For example, it is necessary to prepare a camera including a red color filter, take a picture of a facial skin to acquire a first image, prepare a camera including a blue color filter, take a picture of the skin to acquire a second image for analysis.
SUMMARY
The present disclosure has been made in consideration of the above situation, and thus the present disclosure provides a sensor unit and a camera system for skin characteristics analysis of small size and low cost.
According to one aspect of the present disclosure, there is provided a sensor unit for skin characteristics analysis, comprising:
an image sensor having a plurality of image sensor pixels and outputting color signals;
a color filter, including red color filter pixels and blue color filter pixels, arranged on the image sensor; and
a bandpass filter, configured to transmit a light having a certain wavelength band to the color filter, arranged on the color filter,
wherein the image sensor, configured to output the color signals including color signals of light filtered through the red color filter pixels and color signals of light filtered through the blue color filter pixels, having the certain wavelength band.
According to one aspect of the present disclosure, there is provided a camera system for skin characteristics analysis, comprising:
an image sensor having a plurality of image sensor pixels and outputting color signals;
a color filter, including red color filter pixels and blue color filter pixels, arranged on the image sensor;
a bandpass filter, configured to transmit a certain wavelength band, arranged on the color filter; and
an image processing unit, configured to receive the color signals from the image sensor, perform a predetermined process for the color signals, and output image signals including color signals of light filtered through the red color filter pixels and color signals of light filtered through the blue color filter pixels, having the certain wavelength band.
BRIEF DESCRIPTION OF THE DRAWINGS
These and/or other aspects and advantages of the embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings, in which:
Fig. 1 shows photographs illustrating characteristics of a facial skin;
Fig. 2 shows photographs illustrating cross sectional views of the skin shown in Fig. 1;
Fig. 3 is a graph illustrating a relative reflectance characteristic rate of melanin and hemoglobin included in a skin;
Fig. 4 is a block diagram schematically showing an overall arrangement of a camera system according to one embodiment of the present disclosure;
Fig. 5 is a perspective view illustrating a configuration including a green-cut filter and an image sensor with a red/blue color filter of the camera system of one embodiment of the present disclosure;
Fig. 6 is a plan view illustrating a pixel array pattern of the red/blue color filter;
Fig. 7 is a plan view illustrating a pixel array pattern of a color filter of Bayer arrangement;
Fig. 8 is a graph illustrating transmittances of a red color light and a blue color light;
Fig. 9 is a graph illustrating transmittances of a red color light, a green color light and a blue color light;
Fig. 10A is a graph illustrating a transmittance of a light, filtered by a bandpass filter, such  as a green-cut filter;
Fig. 10B is a graph illustrating sensitivities of a red color light and a blue color light;
Fig. 10C is a graph illustrating sensitivities of a red color light and a blue color light, filtered by the bandpass filter, such as the green-cut filter; and
Fig. 11 is a graph illustrating sensitivities of a red color light, a green color light and a blue color light.
DETAILED DESCRIPTION
Embodiments of the present disclosure will be described in detail and examples of the embodiments will be illustrated in the accompanying drawings. The same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions. The embodiments described herein with reference to the drawings are explanatory and aim to illustrate the present disclosure, but shall not be construed to limit the present disclosure.
A facial skin has specific reflectance characteristics depending on wavelengths of a light, as shown in Fig. 1.
A color image 1 illustrates a facial skin under a normal light condition.
A color image 2 illustrates the same skin under a blue light (ex. 450 nm) . It clearly shows wrinkles, freckles and/or stains of the skin.
A color image 3 illustrates the skin under a green light (ex. 550 nm) . It does not show wrinkles, freckles and/or stains, as clearly in comparison with the color image 2.
A color image 4 illustrates the skin under a red light (ex. 650 nm) . It shows a flat, smooth and clear image of the skin where wrinkles, freckles and/or stains are not obvious in comparison with the color images 1 and 2.
Fig. 2 illustrates cross sectional views of the same skin under the above three light conditions.
A color image 11 illustrates a cross sectional view of the skin under the blue light (ex. 450 nm) . It shows that the blue light reflects at a surface of the skin. The wrinkles, freckles and/or stains being on the surface of the skin, they are very obvious.
A color image 12 illustrates a cross sectional view of the skin under the green light (ex. 550 nm) . It shows that the green light reflects at a middle layer from the surface to a middle depth when compared with the color image 11. The wrinkles, freckles and/or stains are not obvious in comparison with the color image 11.
A color image 13 illustrates a cross sectional view of the skin under the red light (ex. 650 nm) . It shows that the red light reflects at a deep layer from the surface to a deep depth layer. The wrinkles, freckles and/or stains are not obvious in comparison with the  color images  11 and 12.
Fig. 3 illustrates characteristics of a skin, showing relative reflectance characteristic rates of hemoglobin and melanin, depending on wavelengths of a light.
Hemoglobin has higher reflectance than melanin, and it has low reflectance in a certain band width, such as 500 to 600 (nm) . As a result, melanin stands out in this bandwidth.
Thus, an image of a skin, in which wrinkles, freckles and/or stains are obvious, is obtained in this bandwidth.
In contrast, an image of a clear skin in which wrinkles, freckles and/or stains are not obvious, is obtained in a wavelength of more than 600 nm due to hemoglobin having higher reflectance than melanin in this wavelength.
Referring to Fig. 4, a camera system 101 according to one embodiment of the present disclosure comprises an optical system 111, a sensor unit 112 including an image sensor, a color filter and a bandpass filter, and an image processing unit 113.
The optical system 111 includes at least one optical lens, preferably a lens group having a plurality of optical lenses, a diaphragm adjustment mechanism, a zoom mechanism, and an autofocus mechanism. The optical system 111 outputs an incident light 121 through the optical lens.
The sensor unit 112 includes an image sensor, such as a charge-coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) image sensor having a plurality of photoelectric conversion elements, a color filter including red color filter pixels and blue color filter pixels, the color filter being arranged on the image sensor, and a bandpass filter arranged on the color filter. The sensor unit 112 is included in the camera system 101 according to one embodiment of the present disclosure.
The sensor unit 112 receives the incident light 121 from the optical system 111, and outputs color signals 122 including red color signals and blue color signals.
The image processing unit 113 receives the red and blue color signals 122, performs a certain process, for example, combines an image under a red color light and an image under a blue color light, performs predetermined processes such as white balance and color correction, and outputs color image signals 123 including red color image signals and blue color image signals.
The camera system 101 is used for both still and moving images.
The color filter 21 and the bandpass filter 22 of the sensor unit 112 are shown in a perspective view of Fig. 5.
The color filter 21 is arranged on the image sensor (which is not shown) , and the bandpass filter 22 is arranged on the color filter 21. The bandpass filter 22 may be, for example, externally arranged on the color filter 21.
The color filter 21 includes red color filter pixels and blue color filter pixels, and they may be arrayed in a checkerboard pattern, as shown in Fig. 6. It is possible that the color filter 21 includes only red color filter pixels and blue color filter pixels without other color filter pixels, such as green color filter pixels.
A conventional color filter 23 of a Bayer arrangement includes red color filter pixels, green color filter pixels and blue color filter pixels, as shown in Fig. 7. When analyzing skin characteristics, red color filter pixels and blue color filter pixels are needed, as described above.
On the contrary, green color filter pixels do not contribute to the analysis of skin characteristics. Therefore, as a result of the color filter 21 including only the red color filter pixels and the blue color filter pixels, high image resolution can be obtained for the purpose of analyzing skin characteristics, in comparison with the color filter 23 including the red, green and blue color filter pixels.
As illustrated in Fig. 8, a blue color light has high transmittance (sensitivity) in a low wavelength, such as a wavelength lower than 490 (nm) , and a red color light has high transmittance in a high wavelength, such as a wavelength higher than 590 (nm) .
Fig. 9 illustrates the sensitivity of red color light obtained by the conventional color filter 23 of a Bayer arrangement having a red color filter, a green color filter and a blue color filter.
As described above, when capturing an image of a smooth and clear skin without wrinkles, freckles and/or stains, it is necessary to use a light having a wavelength more than 590 (nm) .
However, as shown in Fig. 9, red color light has a certain level of sensitivity in a wavelength band between 570 to 590 (nm) . It is thus necessary to cut off this band between 570 to 590 (nm) of red color light.
As a result of using the color filter 21 of one embodiment of the present disclosure, this wavelength band which is an obstacle to the analysis of skin characteristics, specifically, an area of a green color light, can be cut off by using as the bandpass filter 22 a green-cut filter, for example.
As illustrated in Fig. 10A, a wavelength band between 490 (nm) and 590 (nm) is cut off by the bandpass filter 22. It is desirable to cut off a wavelength more than 690 (nm) , in order to be  able to obtain an image which is not affected by infrared rays which may be an obstacle to the analysis of skin characteristics.
The sensitivities of a blue color light and a red color light shown in Fig. 10B can be acquired by the color filter 21.
By using the bandpass filter 22 arranged on the color filter 21, the sensitivities of a blue color light and a red color light, in which a wavelength band between 490 (nm) and 590 (nm) is cut off, are obtained, as shown in Fig. 10C.
It is quite difficult to fabricate a color filter having the sensitivities shown in Fig. 10C. According to the one embodiment of the present disclosure, these sensitivities can be easily obtained by the combined use of the color filter 21 and the bandpass filter 22, at a low cost.
Further, according to one embodiment of the present disclosure, as shown in Fig. 11, an image under a blue color light (390-450 nm) which clearly shows wrinkles, freckles and/or stains, and an image under a red color light (590-650 nm) which shows a clear skin substantially without wrinkles, freckles and/or stains, as shown in Fig 11, are easily acquired. These two images have two different specific skin characteristics. Accordingly, it is possible to easily analyze the characteristics of a facial skin at a low cost.
For example, it is possible to analyze a bad condition of a facial skin of a certain person using an image under a blue color light (390-450 nm) which clearly shows wrinkles, freckles and/or stains, and to teach the person good skin care to obtain a clear skin without wrinkles, freckles and/or stains such as the one shown in an image under red color light (590-650 nm) .
In the above embodiment of the present disclosure, the analysis of a facial skin characteristics is described. However, the analysis is not limited to a facial skin. It is possible to analyze not only facial skin, but also skin of other areas to obtain an appropriately cared for skin.
If necessary, it is also possible to combine an image under a red light and an image under a blue light, by using the image processing unit 113, to acquire a combined image.
In the description of embodiment of the present disclosure, it is to be understood that terms such as "central" , "longitudinal" , "transverse" , "length" , "width" , "thickness" , "upper" , "lower" , "front" , "rear" , "left" , "right" , "vertical" , "horizontal" , "top" , "bottom" , "inner" , "outer" , "clockwise" and "counterclockwise" should be construed to refer to the orientation or the position as described or as shown in the drawings under discussion. These relative terms are only used to simplify the description of the present disclosure, and do not indicate or imply that the device or element referred to must have a particular orientation, or constructed or operated in a particular orientation. Thus, these terms cannot be construed to limit the present disclosure.
In addition, terms such as "first" and "second" are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features. Thus, the feature defined with "first" and "second" may comprise one or more of this feature. In the description of the present disclosure, "a plurality of" means two or greater than two, unless specified otherwise.
In the description of embodiments of the present disclosure, unless specified or limited otherwise, the terms "mounted" , "connected" , "coupled" and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements, which can be understood by those skilled in the art according to specific situations.
In the embodiments of the present disclosure, unless specified or limited otherwise, a structure in which a first feature is "on" or "below" a second feature may include an embodiment in which the first feature is in direct contact with the second feature and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween. Furthermore, a first feature "on" , "above" or "on top of" a second feature may include an embodiment in which the first feature is right or obliquely "on" , "above" or "on top of" the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature "below" , "under" or "on bottom of" a second feature may include an embodiment in which the first feature is right or obliquely "below" , "under" or "on bottom of" the second feature, or just means that the first feature is at a height lower than that of the second feature.
Various embodiments and examples are provided in the above description to implement different structures of the present disclosure. In order to simplify the present disclosure, certain elements and settings are described in the above. However, these elements and settings are only by way of example and are not intended to limit the present disclosure. In addition, reference numbers and/or reference letters may be repeated in different examples in the present disclosure. This repetition is for the purpose of simplification and clarity and does not refer to relations between different embodiments and/or settings. Furthermore, examples of different processes and materials are provided in the present disclosure. However, it would be appreciated by those skilled in the art that other processes and/or materials may be also applied.
Reference throughout this specification to "an embodiment" , "some embodiments" , "an exemplary embodiment" , "an example" , "aspecific example" or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the  embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the above phrases throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
Although embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that the embodiments are explanatory and cannot be construed to limit the present disclosure, and changes, modifications, alternatives and variations can be made in the embodiments without departing from the scope of the present disclosure.

Claims (7)

  1. A sensor unit for skin characteristics analysis, comprising:
    an image sensor having a plurality of image sensor pixels and outputting color signals;
    a color filter, including red color filter pixels and blue color filter pixels, arranged on the image sensor; and
    a bandpass filter, configured to transmit a light having a certain wavelength band to the color filter, arranged on the color filter,
    wherein the image sensor, configured to output the color signals including color signals of light filtered through the red color filter pixels and color signals of light filtered through the blue color filter pixels, having the certain wavelength band.
  2. The sensor unit according to claim 1, wherein the red color filter pixels and the blue color filter pixels of the color filter are arrayed in a checkerboard pattern.
  3. The sensor unit according to claim 1 or 2, wherein the bandpass filter is a green-cut filter cutting off a light of green color.
  4. A camera system for skin characteristics analysis, comprising:
    an image sensor having a plurality of image sensor pixels and outputting color signals;
    a color filter, including red color filter pixels and blue color filter pixels, arranged on the image sensor;
    a bandpass filter, configured to transmit a certain wavelength band, arranged on the color filter; and
    an image processing unit, configured to receive the color signals from the image sensor, perform a predetermined process for the color signals, and output image signals including color signals of light filtered through the red color filter pixels and color signals of light filtered through the blue color filter pixels, having the certain wavelength band.
  5. The camera system according to claim 4, wherein the red color filter pixels and the blue color filter pixels of the color filter are arrayed in a checkerboard pattern.
  6. The camera system according to claim 4 or 5, wherein the bandpass filter is a green-cut filter cutting off a light of green color.
  7. The camera system according to any one of claims 4-6, wherein the image processing unit is configured to combine the image signals of light filtered through the blue color filter pixels and the image signals of light filtered through the red color filter pixels and output the combined image signals of light filtered through the blue color filter pixels and the red color filter pixels.
PCT/CN2021/092226 2021-05-07 2021-05-07 Sensor unit and camera system for skin characteristics analysis WO2022233059A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103902974A (en) * 2006-07-31 2014-07-02 光谱辨识公司 Biometrics with spatiospectral spoof detection
CN106952252A (en) * 2017-03-06 2017-07-14 武汉嫦娥医学抗衰机器人股份有限公司 A kind of skin imaging systems based on three spectrum
US20190269363A1 (en) * 2016-11-11 2019-09-05 Samsung Eletronics Co., Ltd. Portable electronic device, accessory, and operating method therefor
CN111524080A (en) * 2020-04-22 2020-08-11 杭州夭灵夭智能科技有限公司 Face skin feature identification method, terminal and computer equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103902974A (en) * 2006-07-31 2014-07-02 光谱辨识公司 Biometrics with spatiospectral spoof detection
US20190269363A1 (en) * 2016-11-11 2019-09-05 Samsung Eletronics Co., Ltd. Portable electronic device, accessory, and operating method therefor
CN106952252A (en) * 2017-03-06 2017-07-14 武汉嫦娥医学抗衰机器人股份有限公司 A kind of skin imaging systems based on three spectrum
CN111524080A (en) * 2020-04-22 2020-08-11 杭州夭灵夭智能科技有限公司 Face skin feature identification method, terminal and computer equipment

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