CN112168171A - Skin complexion detection method and device based on wearable pulse signals - Google Patents
Skin complexion detection method and device based on wearable pulse signals Download PDFInfo
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Abstract
The invention discloses a skin complexion detection method based on wearable pulse signals, which comprises the following steps: setting a first illumination intensity of a light beam, and using the light beam with the first illumination intensity as PPG detection light by utilizing a photoplethysmography method; irradiating PPG detection light to the skin surface of a first user, wherein the PPG detection light is reflected to a photosensitive sensor through the skin surface to obtain first received light intensity information of the skin surface; converting the first received light intensity information of the skin surface into a mixed electrical signal; extracting a Direct Current (DC) signal from the mixed electric signal to obtain a first light absorbance of the skin surface to the light beam with the first illumination intensity; obtaining a preset direct current DC signal threshold value; and when the difference value between the first light absorbance and the preset direct current DC signal threshold value is judged to be larger than a first preset threshold value, obtaining a first skin color. The technical problems that skin color detection is complex and judgment accuracy of skin color is low are solved.
Description
Technical Field
The invention relates to a skin color detection technology, in particular to a skin color detection method and device based on wearable pulse signals.
Background
The skin color detection technology refers to a process of selecting a pixel area corresponding to human skin in an image. The human skin color detection technology is widely applied to multiple fields, such as human body detection, human face detection, gesture recognition, image filtering and the like. Skin color detection is often used as a preprocessing in these areas, and its accuracy will have a great influence on the post-processing.
However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the inventors of the present application find that the above-mentioned technology has at least the following technical problems:
because the existing skin color detection equipment is not precise enough and the detection method is not perfect enough, the detection process is complicated, the judgment accuracy of the skin color is very low, the efficiency of the whole process is low, and the identification degree is not high.
Disclosure of Invention
The embodiment of the application provides a skin complexion detection method and device based on a wearable pulse signal, solves the technical problems that the skin complexion is complex to detect, and the judgment accuracy of the complexion is low, and achieves the technical effects of efficiently, quickly and accurately measuring the complexion of a user, strong operability and high identification rate.
In view of the foregoing problems, the embodiments of the present application provide a method and an apparatus for detecting skin complexion based on wearable pulse signals.
In a first aspect, an embodiment of the present application provides a method for detecting skin complexion based on a wearable pulse signal, which is applied to a wearable device having a photosensitive sensor, wherein the method includes: setting a first illumination intensity of a light beam, and using the light beam with the first illumination intensity as PPG detection light by utilizing a photoplethysmography method; irradiating the PPG detection light to the skin surface of a first user, wherein the PPG detection light is reflected to a photosensitive sensor through the skin surface to obtain first received light intensity information of the skin surface; converting first received light intensity information of the skin surface into a mixed electrical signal, wherein the mixed electrical signal comprises a Direct Current (DC) signal and an Alternating Current (AC) signal; extracting the direct current DC signal from the mixed electrical signal to obtain a first light absorbance of the skin surface for the light beam of the first illumination intensity; obtaining a preset direct current DC signal threshold value; judging whether the difference value between the first light absorbance and the preset direct current DC signal threshold is greater than a first preset threshold or not; and when the difference value of the first light absorbance and the preset direct current DC signal threshold value is larger than a first preset threshold value, obtaining a first skin color.
In another aspect, the present application further provides a skin complexion detection device based on a wearable pulse signal, wherein the device includes: a first setting unit for setting a first illumination intensity of the light beam; a first obtaining unit for obtaining first received light intensity information of the skin surface; a first conversion unit for converting first received light intensity information of the skin surface into a mixed electrical signal; a second obtaining unit for obtaining a first light absorbance of the skin surface for the light beam of the first illumination intensity; a third obtaining unit, configured to obtain a preset direct current DC signal threshold; a first judging unit, configured to judge whether a difference between the first light absorbance and the preset DC signal threshold is greater than a first preset threshold; a fourth obtaining unit for obtaining a first skin color.
In a third aspect, the invention provides a wearable pulse signal based skin complexion detection apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method of any one of claims 1-5 when executing the program.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the skin color of a person is judged by measuring the skin of the person by using a photoplethysmography (PPG) and detecting the DC signal intensity in a received signal on the premise of certain illumination intensity during the PPG measurement, so that the technical effects of efficiently, quickly and accurately measuring the skin color of a user, strong operability and high identification rate are achieved; on the other hand, the detection equipment is applied to wearable equipment, so that the skin color detection process is quick, efficient and easy.
The foregoing description is only an overview of the technical solutions of the present application, and the following detailed description of the present application is given to enable the technical means of the present application to be more clearly understood and to enable the above and other objects, features, and advantages of the present application to be more clearly understood.
Drawings
Fig. 1 is a schematic flowchart illustrating a skin complexion detection method based on wearable pulse signals according to an embodiment of the present application;
fig. 2 is a schematic flowchart illustrating the process of obtaining a preset DC signal threshold according to the method for detecting skin complexion based on wearable pulse signals according to the embodiment of the present application;
fig. 3 is a schematic structural diagram of a skin complexion detection apparatus based on a wearable pulse signal according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of an exemplary electronic device according to an embodiment of the present application;
description of reference numerals: a first setting unit 11, a first obtaining unit 12, a first converting unit 13, a second obtaining unit 14, a third obtaining unit 15, a first judging unit 16, a fourth obtaining unit 17, a bus 300, a receiver 301, a processor 302, a transmitter 303, a memory 304, and a bus interface 306.
Detailed Description
The embodiment of the application provides a skin complexion detection method and device based on a wearable pulse signal, solves the technical problems that the skin complexion is complex to detect, and the judgment accuracy of the complexion is low, and achieves the technical effects of efficiently, quickly and accurately measuring the complexion of a user, strong operability and high identification rate. Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are merely some embodiments of the present application and not all embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein.
Summary of the application
The skin color detection has an important role in medical care, has important practical value for skin disease diagnosis and cosmetic effect quantitative analysis, and the change of the skin color can reflect the integrity of a skin barrier and the sensitivity of the skin. The method for judging the skin color of one person by applying the photoplethysmography (PPG) to the wearable device solves the technical problems that the skin color is complex to detect, the judgment accuracy of the skin color is low, the skin color of a user can be measured efficiently, quickly and accurately, the operability is high, and the identification rate is high
In view of the above technical problems, the technical solution provided by the present application has the following general idea:
the embodiment of the application provides a skin complexion detection method and device based on a wearable pulse signal, wherein the method comprises the following steps: setting a first illumination intensity of a light beam, and using the light beam with the first illumination intensity as PPG detection light by utilizing a photoplethysmography method; irradiating the PPG detection light to the skin surface of a first user, wherein the PPG detection light is reflected to a photosensitive sensor through the skin surface to obtain first received light intensity information of the skin surface; converting first received light intensity information of the skin surface into a mixed electrical signal, wherein the mixed electrical signal comprises a Direct Current (DC) signal and an Alternating Current (AC) signal; extracting the direct current DC signal from the mixed electrical signal to obtain a first light absorbance of the skin surface for the light beam of the first illumination intensity; obtaining a preset direct current DC signal threshold value; judging whether the difference value between the first light absorbance and the preset direct current DC signal threshold is greater than a first preset threshold or not; and when the difference value of the first light absorbance and the preset direct current DC signal threshold value is larger than a first preset threshold value, obtaining a first skin color.
The skin color is important information of a face recognition technology, rough face detection is carried out in a color image by utilizing the skin color information to obtain a candidate face area, and each characteristic organ of the face area is researched in an auxiliary mode, so that a face detection system is realized, and the face area is recognized successfully.
After introducing the basic principles and application scenarios of the present application, the following detailed description will be made in conjunction with the accompanying drawings and detailed description of the present application for better understanding of the above technical solutions.
Example one
As shown in fig. 1, an embodiment of the present application provides a method for detecting skin complexion based on a wearable pulse signal, where the method includes:
step S100: setting a first illumination intensity of a light beam, and using the light beam with the first illumination intensity as PPG detection light by utilizing a photoplethysmography method;
specifically, the illumination intensity refers to the energy of the received visible light per unit area, and is called illumination intensity, which is a physical term used for indicating the intensity of illumination and the amount of illumination degree on the surface area of an object. The first light intensity refers to a light beam with a certain wavelength which is used for irradiating the skin surface at the finger tip. The first illumination intensity ranges from 0 to 2080641(0 is a value at which no reflected light is received at all, and 2080641 is a saturation value of the AD sample). The photoplethysmography (PPG) refers to a non-invasive detection method for detecting changes in blood volume in living tissue by means of electro-optical means. When light beam with certain wavelength is irradiated to the surface of finger end skin, the light beam is transmitted to the photoelectric receiver in a transmission or reflection mode, in the process, the light intensity detected by the detector is weakened due to the absorption and attenuation of skin muscle and blood at the detection end, wherein the absorption of skin muscle, tissue and the like to light is kept constant in the whole blood circulation, the volume of blood in the skin is pulsated and changed under the action of heart, when heart contracts, the peripheral blood volume is the largest, the light absorption amount is the largest, the detected light intensity is the smallest, and vice versa, so the light intensity received by the photoelectric receiver is pulsated and changed, the light intensity change signal is converted into an electric signal, and the change of volume pulse blood flow can be obtained. Therefore, the first illumination intensity is used as the detection light for the subsequent detection by the photoplethysmography.
Step S200: irradiating the PPG detection light to the skin surface of a first user, wherein the PPG detection light is reflected to a photosensitive sensor through the skin surface to obtain first received light intensity information of the skin surface;
specifically, the photosensitive sensor is a sensor which converts a light signal into an electrical signal by using a photosensitive element, the sensitive wavelength of the sensor is near the visible wavelength, including the infrared wavelength and the ultraviolet wavelength, the simplest electronic device in the photosensitive sensor is a photosensitive resistor which can sense the light and shade change of light, and the photosensitive sensor is attached to a human body wearable device in the embodiment of the application. The first received light intensity information corresponds to the first illumination intensity, which is the light intensity information received by the photosensitive sensor after the first illumination intensity is irradiated to the skin surface and reflected. When the PPG detection light irradiates the skin surface of the first user, a part of the PPG detection light is absorbed by the skin, and another part of the PPG detection light is reflected to the photosensor through the skin surface, and then the photosensor obtains first received light intensity information of the skin surface.
Step S300: converting first received light intensity information of the skin surface into a mixed electrical signal, wherein the mixed electrical signal comprises Direct Current (DC) and Alternating Current (AC) signals;
specifically, the Direct Current DC is Direct Current (DC for short), which is also called constant Current, and the constant Current is one of the Direct currents and is a Direct Current with a constant magnitude and direction; the alternating current AC is alternating current, which means current whose current direction changes periodically with time, and the average current in one period is zero, unlike direct current, whose direction changes with time, but direct current does not change periodically. In step S200, the photosensitive sensor converts the first received light intensity information into a mixed electrical signal, where the electrical signal includes a dc signal and an ac signal, and the conversion process lays a foundation for subsequent dc signal extraction.
Step S400: extracting the direct current DC signal from the mixed electrical signal to obtain a first light absorbance of the skin surface for the light beam of the first illumination intensity;
specifically, the first light absorbance refers to the absorbance of the skin to light, when light with a fixed intensity is irradiated on the skin, a received light intensity signal can be represented as a mixed electrical signal (direct current plus alternating current), when the light intensity is reflected by 100%, the direct current at the moment is marked to be the maximum, and experiments verify that the direct currents obtained by people with different skin colors are obviously different, the direct current obtained by people with darker skin colors is obviously smaller than the maximum direct current, and the direct current obtained by people with lighter skin colors is obviously close to the maximum direct current, so that the change of the skin color can be visually judged according to the magnitude of the direct current.
Step S500: obtaining a preset direct current DC signal threshold value;
specifically, the preset direct current DC signal threshold refers to a threshold preset for direct current, which can reflect the light absorption degree of skin to the greatest extent, and the skin color depth of the user is determined by comparing the direct current of the mark after the illumination intensity is reflected with the preset direct current DC signal threshold.
Step S600: judging whether the difference value between the first light absorbance and the preset direct current DC signal threshold is greater than a first preset threshold or not;
specifically, the difference between the first light absorbance and the preset direct current DC signal threshold is compared with the first preset threshold, and for a darker skin color, the absorbance of the first light is more, and the obtained direct current is significantly smaller than the preset direct current DC signal threshold, that is, the difference between the two is larger and larger than the first preset threshold; for lighter skin color, the absorbance of the first light is less, and the obtained direct current is close to a preset direct current DC signal threshold, namely, the difference between the two is smaller and smaller than the first preset threshold.
Step S700: when the difference value between the first light absorbance and the preset direct current DC signal threshold value is larger than a first preset threshold value, obtaining a first skin color;
specifically, the first preset threshold is used to determine a difference between the first light absorbance and the preset DC signal threshold, where the first preset threshold may be set to 1400000, and the difference between the first light absorbance and the preset DC signal threshold is compared to determine the lightness problem of the first skin color, where when the difference between the first light absorbance and the preset DC signal threshold is greater than the first preset threshold, the obtained first skin color is darker, and when the difference between the first light absorbance and the preset DC signal threshold is less than the first preset threshold, the obtained first skin color is lighter.
For example: the following are experimental data of a certain test
1150814 1151663 1152438 1151746 1152818 1153298
1152560 1152611 1152648 1150194 1150006 1148534
1147021 1146020 1144917 1143492 1142999 1142336
1141351 1139884 1140092 1139325 1139127 1138626
1138708 1138223 1138186 1138649 1138200 1137875
1138018 1137896 1137609 1137765 1137938 1137560
1137563 1137812 1137614 1137557 1137216 1137250
1137634 1137178 1137637 1137735 1137274 1137744
1137576 1138418 1138587 1138887 1138292 1138644
1139192 1139764 1140193 1140803 1140662 1141742
1141344 1142888 1142601 1143084 1143166 1143573
1144438 1145210 1145356 1145051 1146338 1146485
1147017 1147062 1147912 1148159 1148098 1149050
1150028 1150482 1150981 1150934 1150921 1150368
1149252 1149543 1147539 1146920 1145601 1143535
1143060 1141038 1140204 1139949 1138079 1138580
1137148 1136895 1136000 1135643 1135199 1134810
1134415 1133659 1134487 1134758 1133926 1133945
1133583 1133926 1133641 1133474 1133675 1133310
1133313 1132743 1133170 1132707 1132715 1132019
1133222 1133064 1132972 1133040 1133695 1133192
1133544 1133115 1133433 1134386 1134896 1134563
1135659 1135821 1135615 1136183 1136972 1137036
1137431 1138030 1137929 1138468 1139471 1138643
1139581 1140375 1140276 1141363 1141725 1141830
1142560 1143747 1143719 1143855 1144347 1144934
1144873 1144052 1144030 1142788 1141909 1140382
1139205 1137502 1136555 1135121 1134954 1134093
1132464 1132215 1131545 1130422 1130127 1129835
1129585 1128958 1128601 1128110 1128648 1128341
1128224 1128126 1128266 1128509 1127264 1127446
After the FFT of this data, the amount of the obtained DC signal is 1143348, and this data is smaller than the preset signal threshold 1400000, so that most of the tested people with a darker skin color can be obtained.
Further, determining whether a difference between the first light absorbance and the preset DC signal threshold is greater than a first preset threshold, further includes step S710:
step S710: obtaining a second skin color when the difference between the first light absorbance and the preset direct current DC signal threshold is not greater than a first preset threshold, wherein the second skin color is less than the skin color depth of the first skin color;
specifically, the second skin color is different from the first skin color, the depth problem of the second skin color is judged by comparing the difference value between the first light absorbance and the preset direct current DC signal threshold, when the difference value between the first light absorbance and the preset direct current DC signal threshold is smaller than a first preset threshold, the obtained first skin color is lighter, and the second skin color is smaller than the skin color depth of the first skin color, so that the effects of quickly, efficiently and accurately detecting the skin color and improving the skin color detection efficiency are achieved.
As shown in fig. 2, in order to achieve the effect of improving the accuracy of detecting the skin color, step S500 of the embodiment of the present application further includes:
step S510: when the PPG detection light is totally reflected to a photosensitive sensor through the skin surface, obtaining the maximum value Dmax of a Direct Current (DC) signal;
step S520: setting the maximum value Dmax of the direct current DC signal as a preset direct current DC signal threshold value;
specifically, the maximum value Dmax of the obtained direct current DC signal is: taking a fixed intensity of light as PPG detection light, when the fixed intensity of light is illuminated on the skin, the received light intensity signal can be expressed as: X-D + a, wherein D represents the direct current DC signal and a represents the alternating current AC signal. When the first illumination intensity is reflected by 100% of the skin surface, the reflected light can be completely received through the photosensitive sensor, the direct current DC signal at the moment is marked as Dmax, the maximum value Dmax of the obtained direct current signal is set as a preset direct current signal threshold value, the skin color condition of the first user is obtained by comparing the direct current signal reflected by the skin with the preset direct current signal threshold value, and the effect of efficiently and accurately detecting the skin color is achieved.
In summary, the skin complexion detection method based on the wearable pulse signal provided by the embodiment of the application has the following technical effects:
1. the skin color detection method based on the wearable pulse signal is applied to wearable equipment, the wearable equipment is provided with the photosensitive sensor, the photosensitive sensor can convert received light intensity information into a mixed electric signal, subsequent direct current signals can be conveniently extracted, and then the skin color depth of a user can be judged.
2. Because the skin color of the user is judged by using the photoplethysmography, the method is a non-invasive method, the damage to a human body is reduced, the operability is very strong, the complex flow in the detection process is solved, and the technical effects of accurately detecting the skin color of the user and having very high discrimination rate are achieved.
Example two
Based on the same inventive concept as the skin complexion detection method based on the wearable pulse signal in the foregoing embodiment, the present invention further provides a skin complexion detection device based on the wearable pulse signal, as shown in fig. 3, the device includes:
a first setting unit 11, the first setting unit 11 being configured to set a first illumination intensity of the light beam;
a first obtaining unit 12, the first obtaining unit 12 being configured to obtain first received light intensity information of the skin surface;
a first conversion unit 13, the first conversion unit 13 being configured to convert first received light intensity information of the skin surface into a mixed electrical signal;
a second obtaining unit 14, said second obtaining unit 14 being configured to obtain a first light absorbance of said skin surface for said light beam of said first illumination intensity;
a third obtaining unit 15, where the third obtaining unit 15 is configured to obtain a preset direct current DC signal threshold;
a first judging unit 16, where the first judging unit 16 is configured to judge whether a difference between the first light absorbance and the preset DC signal threshold is greater than a first preset threshold;
a fourth obtaining unit 17, said fourth obtaining unit 17 being configured to obtain the first skin color.
Further, the apparatus further comprises:
a fifth obtaining unit for obtaining a maximum value Dmax of the direct current DC signal;
a first setting unit: the first setting unit is used for setting the maximum value D of the direct current DC signalmaxA DC signal threshold is preset.
Further, the apparatus further comprises:
a sixth obtaining unit, configured to obtain a second skin color when a difference between the first light absorbance and the preset direct current DC signal threshold is not greater than a first preset threshold.
Various changes and specific examples of the skin complexion detection method based on the wearable pulse signal in the first embodiment of fig. 1 are also applicable to the skin complexion detection device based on the wearable pulse signal in the present embodiment, and through the foregoing detailed description of the skin complexion detection method based on the wearable pulse signal, those skilled in the art can clearly know the implementation method of the skin complexion detection device based on the wearable pulse signal in the present embodiment, so for the brevity of the description, the detailed description is not repeated again.
EXAMPLE III
The electronic device of the embodiment of the present application is described below with reference to fig. 4.
Fig. 4 illustrates a schematic structural diagram of an electronic device according to an embodiment of the present application.
Based on the inventive concept of a skin complexion detection method based on a wearable pulse signal in the foregoing embodiments, the present invention further provides a skin complexion detection device based on a wearable pulse signal, on which a computer program is stored, and when the program is executed by a processor, the steps of any one of the foregoing early warning methods for remote security prevention and control are implemented.
Where in fig. 4 a bus architecture (represented by bus 300), bus 300 may include any number of interconnected buses and bridges, bus 300 linking together various circuits including one or more processors, represented by processor 302, and memory, represented by memory 304. The bus 300 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 306 provides an interface between the bus 300 and the receiver 301 and transmitter 303. The receiver 301 and the transmitter 303 may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium.
The processor 302 is responsible for managing the bus 300 and general processing, and the memory 304 may be used for storing data used by the processor 302 in performing operations.
The embodiment of the invention provides a skin complexion detection method based on wearable pulse signals, wherein the method comprises the following steps: setting a first illumination intensity of a light beam, and using the light beam with the first illumination intensity as PPG detection light by utilizing a photoplethysmography method; irradiating the PPG detection light to the skin surface of a first user, wherein the PPG detection light is reflected to a photosensitive sensor through the skin surface to obtain first received light intensity information of the skin surface; converting first received light intensity information of the skin surface into a mixed electrical signal, wherein the mixed electrical signal comprises a Direct Current (DC) signal and an Alternating Current (AC) signal; extracting the direct current DC signal from the mixed electrical signal to obtain a first light absorbance of the skin surface for the light beam of the first illumination intensity; obtaining a preset direct current DC signal threshold value; judging whether the difference value between the first light absorbance and the preset direct current DC signal threshold is greater than a first preset threshold or not; and when the difference value of the first light absorbance and the preset direct current DC signal threshold value is larger than a first preset threshold value, obtaining a first skin color. The technical problems that skin complexion is complex to detect and judgment accuracy of the complexion is low are solved, and the technical effects of efficiently, quickly and accurately measuring the complexion of a user, strong operability and high identification rate are achieved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A skin complexion detection method based on wearable pulse signals is applied to a wearable device, the wearable device is provided with a photosensitive sensor, and the method comprises the following steps:
setting a first illumination intensity of a light beam, and using the light beam with the first illumination intensity as PPG detection light by utilizing a photoplethysmography method;
irradiating the PPG detection light to the skin surface of a first user, wherein the PPG detection light is reflected to the photosensitive sensor through the skin surface to obtain first received light intensity information of the skin surface;
converting first received light intensity information of the skin surface into a mixed electrical signal, wherein the mixed electrical signal comprises a Direct Current (DC) signal and an Alternating Current (AC) signal;
extracting the direct current DC signal from the mixed electrical signal to obtain a first light absorbance of the skin surface for the light beam of the first illumination intensity;
obtaining a preset direct current DC signal threshold value;
judging whether the difference value between the first light absorbance and the preset direct current DC signal threshold is greater than a first preset threshold or not;
and when the difference value of the first light absorbance and the preset direct current DC signal threshold value is larger than a first preset threshold value, obtaining a first skin color.
2. The method of claim 1, wherein the first illumination intensity ranges from 0 to 2080641(0 being the total lack of reflected light received and 2080641 being the saturation of the AD sample).
3. The method of claim 1, wherein the first received light intensity information is denoted as X ═ D + A,
wherein D represents the direct current DC signal and A represents the alternating current AC signal.
4. The method of claim 1, wherein the obtaining a preset Direct Current (DC) signal threshold comprises:
obtaining a maximum value D of a direct current DC signal when the PPG detection light is totally reflected to a photosensitive sensor through the skin surfacemax；
Setting a maximum value D of the DC signalmaxA DC signal threshold is preset.
5. The method of claim 1, wherein said determining whether a difference between the first light absorbance and the preset DC signal threshold is greater than a first preset threshold further comprises:
and when the difference value of the first light absorbance and the preset direct current DC signal threshold value is not larger than a first preset threshold value, obtaining a second skin color, wherein the second skin color is smaller than the skin color depth of the first skin color.
6. A skin complexion detection device based on a wearable pulse signal, wherein the device comprises:
a first setting unit for setting a first illumination intensity of the light beam;
a first obtaining unit for obtaining first received light intensity information of the skin surface;
a first conversion unit for converting first received light intensity information of the skin surface into a mixed electrical signal;
a second obtaining unit for obtaining a first light absorbance of the skin surface for the light beam of the first illumination intensity;
a third obtaining unit, configured to obtain a preset direct current DC signal threshold;
a first judging unit, configured to judge whether a difference between the first light absorbance and the preset DC signal threshold is greater than a first preset threshold;
a fourth obtaining unit, configured to obtain a first skin color when a difference between the first light absorbance and the preset direct current DC signal threshold is greater than a first preset threshold.
7. A wearable pulse signal based skin complexion detection apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method of any of claims 1-5 when executing the program.
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