WO2021103008A1

WO2021103008A1 - Adaptive biological feature detection method and apparatus, and electronic device

Info

Publication number: WO2021103008A1
Application number: PCT/CN2019/122199
Authority: WO
Inventors: 刘畅
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2021-06-03
Also published as: CN111093487A; CN111093487B

Abstract

An adaptive biological feature detection method and apparatus, and an electronic device. The adaptive biological feature detection method comprises: automatically identifying the current skin color of a measured subject (101); controlling a light emitter to emit a first initial light signal to the measured subject, and controlling a light receiver to receive a first light signal after the first initial light signal passes through the measured subject (102); and obtaining, according to the current skin color and the first light signal, a biological feature of the measured subject (103). By using the described method, a calculated biological feature is adapted to the skin color of a measured subject, the accuracy of the detected biological feature is improved, and power consumption is reduced; in addition, biological feature detection is compatible with multiple skin colors.

Description

Adaptive biological feature detection method and device, and electronic equipment

Technical field

This application relates to the field of biometrics technology, in particular to an adaptive biometric detection method and device, and electronic equipment.

Background technique

Nowadays, with the popularity of wearable devices such as watches, bracelets, and earphones, in addition to basic functions such as step counting, timing, and positioning, wearable devices can also detect the wearer’s biological characteristics, such as heart rate, blood Oxygen saturation, etc., which can record the physiological changes of the wearer and monitor the health of the wearer in real time.

Existing wearable devices generally use photoelectric detection to detect the biological characteristics of the wearer. Taking heart rate detection as an example, the most commonly used method for measuring heart rate is the photoelectric pulse volume (PPG) method, which uses LEDs to emit light of a specific wavelength and is transmitted, scattered, diffracted and reflected by human tissues, and then returns to the light signal. Converted to electrical signal, so as to obtain the corresponding PPG signal. During the propagation of the light beam in human tissues, it is attenuated due to the absorption of human tissues. The absorption of static tissues such as skin, fat, muscle, etc. is a constant value, while the blood produces periodic volume changes due to the contraction and diastole cycles of the heart. The PPG signal produces a periodic waveform consistent with the heartbeat, so the PPG signal can measure the heartbeat frequency.

Summary of the invention

The purpose of some embodiments of this application is to provide an adaptive biometric detection method and device, and electronic equipment, so that the calculated biometrics are adapted to the skin color of the tested object, and the accuracy of the detected biometrics is improved. Reduced power consumption; and compatible with biometric detection of multiple skin colors.

The embodiment of the present application provides an adaptive biological feature detection method, including: automatically identifying the current skin color of the measured object; controlling the light emitter to send a first initial light signal toward the measured object, and controlling the light receiver to receive the first The first light signal after the initial light signal passes through the measured object; the biological characteristics of the measured object are obtained according to the current skin color and the first light signal.

The embodiment of the present application provides an adaptive biometric detection device, including: a skin color detection module and a biometric detection module; the skin color detection module is used to automatically identify the current skin color of the measured object; the biometric detection module is used to control light emission The device sends out the first initial light signal toward the measured object, and controls the light receiver to receive the first light signal after the first initial light signal passes through the measured object; the biometric detection module is also used to, according to the current skin color and the first light signal, Obtain the biological characteristics of the tested object.

An embodiment of the present application also provides an electronic device, including the above-mentioned adaptive biometric detection device.

For the prior art, the embodiment of this application is to identify the current skin color of the tested object first when detecting the biological characteristics of the tested object, and then control the light emitter to send the first initial light signal towards the tested object, and Control the light receiver to receive the first light signal after the first initial light signal passes through the measured object, so that the biological characteristics of the measured object can be obtained according to the current skin color and the first light signal, so that the calculated biological characteristics correspond to the measured object It is compatible with the skin color, which improves the accuracy of the detected biometrics and reduces power consumption; and it is compatible with biometric detection of multiple skin colors.

For example, obtaining the biological characteristics of the measured object according to the current skin color and the first light signal includes: adjusting the received first light signal according to the current skin color; and calculating the biological characteristics of the measured object according to the adjusted first light signal . This embodiment provides a specific implementation method for obtaining the biological characteristics of the measured object according to the current skin color and the first light signal.

For example, adjusting the received first optical signal according to the current skin color includes: adjusting a preset gain parameter according to the current skin color; and multiplying the adjusted gain parameter by the first optical signal to obtain the adjusted first optical signal. This embodiment provides a specific implementation manner for adjusting the received first light signal according to the current skin color.

For example, before controlling the light transmitter to send the first initial light signal toward the measured object and controlling the light receiver to receive the first light signal after the first initial light signal passes through the measured object, the method further includes: adjusting the light according to the current skin color. The transmitter is driven to change the intensity of the first initial light signal emitted by the light transmitter. In this embodiment, the driving of the light emitter can be adjusted according to the current skin color to change the intensity of the first initial light signal emitted by the light emitter, so that the intensity of the first initial light signal emitted by the light emitter is the same as the skin color of the object under test. Matching further improves the accuracy of the acquired biological characteristics.

For example, before automatically identifying the current skin color of the measured object, the method further includes: controlling at least one light emitter to send a second initial light signal toward the measured object, and controlling at least one light receiver to receive the second initial light signal and pass the measured object After the second light signal; automatically identifying the current skin color of the measured object, including: obtaining the current skin color of the measured object according to the second initial light signal and the second light signal. This embodiment provides a specific implementation manner for automatically identifying the current skin color of the measured object.

For example, obtaining the current skin color of the measured object according to the second initial light signal and the second light signal includes: calculating the second initial light signal of the measured object according to the intensity of the second initial light signal and the intensity of the second light signal The light absorption rate; according to the light absorption rate and the corresponding relationship between the preset light absorption rate range and the skin color, the current skin color is obtained. This embodiment provides a specific implementation for obtaining the current skin color of the object under test based on the second initial light signal and the second light signal.

For example, controlling at least one light emitter to emit a second initial light signal toward the object under test, and controlling at least one light receiver to receive the second light signal after the second initial light signal passes through the object under test, includes: controlling multiple light emission The device sends a plurality of second initial light signals toward the measured object, and controls at least one light receiver to receive each second light signal after each second initial light signal passes through the measured object; according to the second initial light signal and the second light Signal to obtain the current skin color of the object under test, including: for each light emitter, according to the second initial light signal and the second light signal from the light emitter, calculate the second initial light signal from the object under test to the light emitter The light absorption rate of the optical signal; the current skin color of the measured object is obtained according to the light absorption rate of the second initial light signal emitted by each emitter and the wavelength of the second initial light signal emitted by each light emitter. This embodiment provides another specific implementation manner for obtaining the current skin color of the measured object according to the second initial light signal and the second light signal, which can improve the accuracy of the acquired current skin color of the measured object.

For example, controlling multiple light emitters to send multiple second initial light signals toward the object under test includes: controlling multiple light emitters to send multiple second initial light signals of different wavelengths toward the object under test.

For example, according to the light absorption rate of the second initial light signal emitted by each emitter and the wavelength of the second initial light signal emitted by each light emitter, the current skin color of the measured object is obtained, including: according to the measured object The light absorption rate of each second initial light signal and the difference in absorption of the second initial light signal of different wavelengths of the measured object are obtained to obtain the current skin color of the measured object. In this embodiment, based on the difference in the absorption of the second initial light signals of different wavelengths by the same skin color, the second initial light signals of multiple wavelengths are combined to determine the skin color of the tested object, thereby improving the accuracy of skin color detection.

For example, controlling multiple light emitters to send multiple second initial light signals toward the measured object includes: controlling multiple light emitters located in different regions to send multiple second initial light signals of different wavelengths toward the measured object; According to the light absorption rate of the second initial light signal emitted by the measured object to each emitter and the wavelength of the second initial light signal emitted by each light emitter, the current skin color of the measured object is obtained, including: The light absorption rate of the second initial light signal, the location of the area where the multiple light emitters are located, and the difference in the absorption of the second initial light signals of different wavelengths of the measured object, obtain the current skin color of the measured object. In this embodiment, based on the difference in absorption of the second initial light signal emitted by the emitters located in different regions and the difference in absorption of the second initial light signal of different wavelengths by the same skin color, the current of the measured object is obtained. Skin color, which further improves the accuracy of skin color detection.

For example, the biological characteristics include heart rate and/or blood oxygen saturation.

Description of the drawings

One or more embodiments are exemplified by the pictures in the accompanying drawings. These exemplified descriptions do not constitute a limitation on the embodiments. The elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the attached drawings do not constitute a scale limitation.

Fig. 1 is a schematic diagram of a wearable device applying an adaptive biometric detection method according to the first embodiment of the present application;

2 is a block diagram of a wearable device applying an adaptive biometric detection method according to the first embodiment of the present application;

Fig. 3 is a flowchart of an adaptive biometric detection method according to the first embodiment of the present application;

Fig. 4 is a specific flow chart of step 103 in Fig. 3 according to the first embodiment of the present application;

Fig. 5 is a flowchart of an adaptive biometric detection method according to a second embodiment of the present application;

Fig. 6 is a flowchart of an adaptive biometric detection method according to the third embodiment of the present application;

Fig. 7 is a flowchart of an adaptive biometric detection method according to a fourth embodiment of the present application;

Fig. 8 is a block diagram of a wearable device applying an adaptive biometric detection method according to a fifth embodiment of the present application;

Fig. 9 is a flowchart of an adaptive biometric detection method according to a fifth embodiment of the present application;

FIG. 10 is a curve of light absorption rate and skin tone of two emitters in different positions according to the fifth embodiment of the present application;

FIG. 11 is a curve of the light absorption rate and the skin tone of three emitters that emit light signals of different wavelengths according to the fifth embodiment of the present application;

Fig. 12 is a block diagram of an adaptive biometric detection device according to a sixth embodiment of the present application;

Fig. 13 is a block diagram of an adaptive biometric detection device according to the eighth embodiment of the present application.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present application clearer, some embodiments of the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

The inventor found that when using photoelectric detection to detect the biological characteristics of the wearer, it is more sensitive to the wearer’s skin color. Different skin colors absorb light differently. Therefore, the skin color may cause the following problems: The biometrics are inaccurate and the power consumption is high; and a wearable device cannot be compatible with biometric detection of all skin colors. Based on this, the inventor proposed the technical solution of this application.

The first embodiment of the present application relates to an adaptive biometric detection method, which is applied to an adaptive biometric detection device in an electronic device, such as a wearable device such as a watch and a bracelet. The adaptive biometric detection The device is, for example, a biometric chip. 1 and 2, the electronic device includes a biometric chip 100, and a light transmitter 200 and a light receiver 300 respectively connected to the biometric chip; in this embodiment, the wearable device may also include a light transmitter The isolation component 400 between the optical receiver 200 and the optical receiver 300 is used to block the light emitted by the optical transmitter 200 from directly hitting the optical receiver 300. The light transmitter 200 and the light receiver 300 can be arranged outside the biometric chip 100, but it is not limited to this, and the light emitter 200 and the light receiver 300 can also be arranged inside the biometric chip 100.

The specific process of the adaptive biological feature detection method of this embodiment is shown in FIG. 3.

Step 101: Automatically recognize the current skin color of the measured object.

Specifically, when it is detected that the measured object is close to the electronic device, for example, the user wears a wearable device, the biometric chip detects the skin color of the measured object, and obtains the current skin color of the measured object. The current skin color can characterize the measured object's skin color. The skin tone is light and light. Among them, the division method of skin color can be set as required, for example, it can be simply divided into white people, yellow people, and black people; or divided into black, dark brown, brown, yellow, off-white, and white according to skin color.

Step 102: Control the light transmitter to send a first initial light signal toward the measured object, and control the light receiver to receive the first light signal after the first initial light signal passes through the measured object.

Specifically, the biometric chip can biometrically recognize the object under test after receiving a detection command or according to a preset cycle, and control the light emitter to send out the first initial light signal toward the object under test, and the light emitter sends out the first initial light signal toward the object under test. After the first initial light signal is reflected, scattered and absorbed by the skin tissue of the tested object, a part of the light is emitted from the skin of the tested object, and the light receiver receives the emitted light and converts it into an electrical signal, which is the first light Signal, and send the first light signal to the biometric chip; where the light emitter can be a light-emitting diode, and the biometric chip can control the driving current of the light-emitting diode so that it emits light with a preset wavelength and light intensity Signal, the optical receiver can be a photodiode.

Step 103: Obtain the biological characteristics of the measured object according to the current skin color and the first light signal. Please refer to FIG. 4. Step 103 includes the following sub-steps:

In sub-step 1031, the received first light signal is adjusted according to the current skin color.

Specifically, an initial gain parameter is preset in the biometric chip, and the gain parameter can be adjusted according to the current skin color. Specifically, the initial gain parameter set in the biometric chip corresponds to a reference skin color. When the current skin color is recognized When the skin color is greater than the reference skin color, it means that the skin color of the measured object is darker, and the gain parameter is increased; when the current skin color recognized is smaller than the reference skin color, it means that the skin color of the measured object is lighter, and the gain parameter is reduced. A light signal is multiplied by the adjusted gain parameter to obtain the adjusted first light signal, and the adjusted first light signal is adapted to the skin color of the measured object.

In sub-step 1032, the biological characteristics of the object to be measured are calculated according to the adjusted first light signal.

Specifically, because the adjusted first light signal is adapted to the skin color of the object to be measured, the biological characteristics of the object to be measured calculated according to the adjusted first light signal are also adapted to the skin color of the object to be measured. Improved the accuracy of the calculated biometrics. Among them, the biological characteristics are, for example, heart rate, blood oxygen saturation, and the like.

It should be noted that in this embodiment, the current skin color of the tested object can be automatically recognized once when the user wears the wearable device for the first time, and then the biometric detection can be performed. After that, it can be performed after each preset number of biometric detections. , Or when the detection command sent by the user is received, the skin color of the tested object will be recognized, and there is no need to recognize the skin color of the tested object at the same time when the biological feature is detected.

Compared with the prior art, this embodiment first recognizes the current skin color of the object under test when detecting the biological characteristics of the object under test, and then controls the light emitter to emit the first initial light signal toward the object under test, and controls The light receiver receives the first light signal after the first initial light signal passes through the measured object, so that the biological characteristics of the measured object can be obtained according to the current skin color and the first light signal, so that the calculated biological characteristics are consistent with that of the measured object. The skin color is compatible, which improves the accuracy of the detected biometrics and reduces power consumption; and it is compatible with biometric detection of multiple skin colors.

The second embodiment of the present application relates to an adaptive biological feature detection method. Compared with the first embodiment, the main difference of this embodiment is that the intensity of the emitted first initial light signal is adjusted.

The specific process of the adaptive biological feature detection method of this embodiment is shown in FIG. 5.

Among them, step 201, step 203, and step 204 are roughly the same as step 101 to step 103, and will not be repeated here. The main difference is that step 202 is added, which is specifically as follows:

Step 202: Adjust the driving of the light emitter according to the current skin color to change the intensity of the first initial light signal emitted by the light emitter.

Specifically, after the biometric chip recognizes the current skin color of the measured object, it adjusts the driving (for example, the driving current) of the light emitter to change the intensity of the first initial light signal emitted by the light emitter, then in step 203 The light emitter can be controlled to emit the first initial light signal of this intensity, so that the intensity of the first initial light signal emitted by the light emitter matches the skin color of the measured object. Specifically, if the current skin color characterizes the darker skin color of the measured object, a first initial light signal with a high intensity needs to be sent. At this time, the driving current of the light emitter is increased to increase the first initial light emitted by the light emitter. The intensity of the signal increases the intensity of the first light signal and increases the signal-to-noise ratio; if the current skin color characterizes the lighter skin color of the measured object, there is no need to transmit the first initial light signal with a high intensity, and the light is reduced at this time. The driving current of the transmitter is used to reduce the intensity of the first initial optical signal sent by the optical transmitter, so that the intensity of the first optical signal is reduced, and the power consumption is reduced.

Compared with the first embodiment, this embodiment can adjust the intensity of the first initial light signal emitted by the light emitter according to the current skin color, so that the intensity of the first initial light signal emitted by the light emitter is the same as the skin color of the measured object. Matching further improves the accuracy of the acquired biological characteristics.

The third embodiment of the present application relates to an adaptive biometric detection method. Compared with the first embodiment, the main difference of this embodiment is that it provides a specific implementation for automatically identifying the current skin color of the measured object the way.

The specific process of the adaptive biological feature detection method of this embodiment is shown in FIG. 6.

Among them, step 303 and step 304 are roughly the same as step 102 to step 103, and will not be repeated here. The main differences are:

Step 301: Control at least one light transmitter to send a second initial light signal toward the object under test, and control at least one light receiver to receive the second light signal after the second initial light signal passes through the object under test.

Specifically, when it is detected that the measured object is close to the electronic device, for example, the user wears a wearable device, the biometric chip controls the light emitter to send a second initial light signal toward the measured object, and the second initial light signal passes through the measured object’s After the reflection, scattering and absorption of the skin tissue, a part of the light is emitted from the skin of the tested object. The light receiver receives the emitted light and converts it into an electrical signal, which is the second light signal, and sends the second light signal to the organism Identify the chip.

Step 302: Obtain the current skin color of the object under test according to the second initial light signal and the second light signal.

Specifically, the darker the skin color of the object under test, the lower the efficiency of light transmission, and the more light it absorbs. Therefore, the second light signal can reflect the light absorbed by the object’s skin in the second initial light signal. Therefore, the biometric chip can obtain the current skin color of the tested object according to the second initial light signal emitted by the light emitter and the second radiated light signal corresponding to the second initial light signal, and the current skin color can represent the depth of the skin of the tested object.

It should be noted that in this embodiment, the biometric chip can also directly obtain the biological characteristics of the measured object based on the current skin color and the second light signal. In this case, there is no need to perform step 303 to control the light emitter to emit the first light toward the measured object. The initial light signal, and the light receiver is controlled to receive the first light signal after the first initial light signal passes through the object under test.

Compared with the first embodiment, this embodiment provides a specific implementation manner for automatically identifying the current skin color of the measured object.

The fourth embodiment of the present application relates to an adaptive biological feature detection method. Compared with the third embodiment, the main difference of this embodiment is that it provides a method for obtaining data based on the second initial optical signal and the second optical signal. A concrete realization of the current skin color of the measured object.

The specific process of the adaptive biological feature detection method of this embodiment is shown in FIG. 7.

Among them, step 401, step 403, and step 404 are substantially the same as step 301, step 303, and step 304, and will not be repeated here. The main difference is that step 402 includes the following sub-steps:

Sub-step 4021, according to the intensity of the second initial light signal and the intensity of the second light signal, calculate the light absorption rate of the second initial light signal by the measured object.

Specifically, the intensity of the second initial light signal emitted by the biometric chip controlled by the light transmitter is known, and at the same time the intensity of the second light signal received by the light receiver can be obtained. As mentioned above, the darker the skin color of the measured object , The lower the efficiency of light transmission, the more light absorbed by the skin, and the lower the intensity of the light signal after passing through the measured object. Therefore, the measured light signal can be calculated based on the intensity of the second initial light signal and the intensity of the second light signal. The light absorption rate of the object to the second initial light signal; for example, the ratio of the intensity of the second initial light signal to the intensity of the second light signal can be calculated as the light absorption rate of the measured object to the second initial light signal to characterize The skin tone of the test subject is light or dark.

In sub-step 4022, the current skin color is obtained according to the corresponding relationship between the light absorption rate and the preset light absorption rate range and the skin color.

Specifically, the biometric chip is preset with the corresponding relationship between the light absorption rate range and the skin color, so that the light absorption rate of the second initial light signal of the tested object and the corresponding relationship can be obtained by calculation, and the current value of the tested object can be obtained. color.

Compared with the fourth embodiment, this embodiment provides a specific implementation manner for obtaining the current skin color of the measured object according to the second initial light signal and the second light signal.

The fifth embodiment of the present application relates to an adaptive biological feature detection method. Compared with the third embodiment, the main difference of this embodiment is: according to the second initial optical signal and the second optical signal, the measured Another concrete realization of the object's current skin color.

In this embodiment, referring to FIG. 8, the number of optical transmitters 200 in the wearable device is multiple, and the number of optical receivers 300 can be one or more (in the figure, multiple optical transmitters are used as an example). The optical signal sent by the optical transmitter 200 can be received by one optical receiver 300, that is, multiple optical transmitters 200 correspond to one optical receiver 300, or a corresponding optical receiver 300 can be set for each optical transmitter 200 for Receive the light signal from it.

The specific process of the adaptive biological feature detection method of this embodiment is shown in FIG. 9.

Among them, step 503 and step 504 are roughly the same as step 303 and step 304, and will not be repeated here. The main differences are:

Step 501: Control multiple light emitters to send multiple second initial light signals toward the measured object, and control at least one light receiver to receive each second light signal after each second initial light signal passes through the measured object.

Specifically, the biometric chip controls multiple light emitters to sequentially send out second initial light signals toward the object to be measured, and the biometric chip also presets light receiving for receiving the second initial light signals from the light emitters. Therefore, when the biometric chip controls each light transmitter to send the second initial light signal, it will simultaneously activate the corresponding light receiver to receive the second light signal. Among them, multiple optical transmitters can be located in different regional locations and transmit optical signals of the same wavelength; or multiple optical transmitters can be located in different regional locations and transmit optical signals of different wavelengths; or, multiple optical transmitters can be located in Different regional locations send optical signals of the same wavelength. Among them, each light emitter corresponds to a light receiver, and the regional position of each light emitter is different, and the regional position is the relative position of the light transmitter and the corresponding light receiver.

In an example, taking the control of multiple light emitters to emit multiple second initial light signals of different wavelengths toward the object under test as an example, for multiple emitters that emit second initial light signals of different wavelengths, the same skin color The light absorptivity of the second initial optical signals of different wavelengths is different. Please refer to Figure 10, taking the example of increasing the wavelengths of the second initial optical signals emitted by three optical transmitters. The three wavelengths are the first wavelength, The second wavelength and the third wavelength, and the first wavelength <the second wavelength <the third wavelength; it can be seen that for the same skin color, the greater the wavelength of the second initial light signal emitted by the transmitter, the greater the impact of the measured object on the second The higher the light absorption rate of the initial light signal.

In an example, for multiple light emitters located in different areas, the propagation path of the light signal of each emitter is different, so the light absorption rate of the light signal emitted by each light emitter is different by the measured object. Please Referring to FIG. 11, two light emitters are located in the first area position and the second area position respectively, and the position of the transmitter 201 relative to the light receiver in the first area position is higher than the position of the transmitter 202 relative to the light in the second area position. The location of the receiver is close as an example. Assuming that the wavelengths of the second initial optical signal from the transmitter 201 and the transmitter 202 are the same, the propagation path of the second initial optical signal from the transmitter 201 is smaller than that of the optical signal from the transmitter 202. According to the propagation path, it can be seen that for the same skin color, the light absorption rate corresponding to the emitter 201 is smaller than the light absorption rate corresponding to the emitter 202.

It can be seen from the above that after determining the wavelength of the second initial optical signal emitted by the optical transmitter and the position of the optical transmitter relative to the corresponding optical receiver, the correlation curve of the absorbance and skin tone corresponding to the optical transmitter can be obtained. , That is, the corresponding relationship between the light absorption rate range of the light emitter and the skin color can be determined.

Step 502 includes the following sub-steps:

In sub-step 5021, for each light emitter, according to the second initial light signal and the second light signal from the light emitter, calculate the light absorption rate of the second initial light signal emitted by the light emitter by the measured object.

Specifically, for each light emitter, the biometric chip can calculate the first light emitted by the object under test based on the second initial light signal and the second light signal from the light emitter. 2. The light absorption rate of the initial light signal; and then the light absorption rate of the second initial light signal emitted by each emitter can be obtained.

In sub-step 5022, the current skin color of the measured object is obtained according to the light absorption rate of the second initial light signal emitted by each emitter and the wavelength of the second initial light signal emitted by each light emitter.

Specifically, if the plurality of second initial light signals are signals of different wavelengths, the biometric chip will determine the light absorption rate of each second initial light signal of the measured object and the measured object’s response to the second initial light of different wavelengths. The absorption difference of the signal obtains the current skin color of the measured object. Specifically, according to the difference in the absorption of the second initial light signal of multiple wavelengths by the skin of the tested object, the corresponding relationship between multiple light absorption rate ranges and skin color can be obtained, and then multiple skin colors can be obtained, and then it can be judged whether the multiple skin colors are similar. Matching, the way to determine whether the multiple skin colors match is to determine whether a certain skin color among the multiple skin colors exceeds a preset threshold, and if so, the skin color can be selected as the current skin color of the tested object. Among them, based on the difference in the absorption of the second initial light signals of different wavelengths by the same skin color, the second initial light signals of multiple wavelengths are combined to determine the skin color of the tested object, thereby improving the accuracy of skin color detection and thereby improving biological characteristics Accuracy of detection and low power consumption.

If the plurality of second initial optical signals are signals of different wavelengths, and the optical transmitters that emit the plurality of second initial optical signals are in different regional positions, the biometric chip will respond to the light of each second initial optical signal according to the measured object. The absorption rate, the location of the area where the multiple light emitters are located, and the difference in the absorption of the second initial light signals of different wavelengths of the object under test are used to obtain the current skin color of the object under test. Specifically, it is possible to combine the difference in absorption of the second initial light signal of multiple wavelengths by the subject’s skin and the regional positions of multiple light emitters to obtain multiple skin colors, and then determine whether the multiple skin colors match, and determine whether multiple skin colors match. The way of matching the skin color is to determine whether there is a certain skin color in the multiple skin colors that exceeds a preset threshold. If it exists, the skin color can be selected as the current skin color of the tested object. Among them, the current skin color of the tested object is obtained based on the difference in absorption of the second initial light signal emitted by the emitters located in different regions and the difference in absorption of the second initial light signal of different wavelengths by the same skin color, and further Improved the accuracy of skin color detection.

It should be noted that in this embodiment, the corresponding relationship between the light absorption rate range corresponding to each emitter and the skin color can also be preset in the biometric chip, and the biometric chip can determine the second initial light signal emission timing according to the preset timing. For the light emitter that sends out the second initial light signal, for each light emitter, the biometric chip can be based on the corresponding relationship between the light absorption rate range of the light emitter and the skin color, and the calculated pair of the measured object The light absorption rate of the second initial light signal emitted by the light emitter obtains the skin color corresponding to the light emitter, so that multiple skin colors corresponding to the multiple light emitters can be obtained.

Compared with the first embodiment, this embodiment provides another specific implementation method for obtaining the current skin color of the object under test based on the second initial light signal and the second light signal, which can improve the obtained current skin color of the object under test. The accuracy of skin tone.

The sixth embodiment of the present application relates to an adaptive biometric detection device, which is applied to electronic equipment, such as wearable devices such as watches and bracelets, and the adaptive biometric detection device is, for example, a biometric chip. Please refer to FIG. 12, taking the adaptive biometric detection device as a biometric chip as an example, the biometric chip 100 includes: a skin color detection module 101 and a biometric detection module 102 connected to each other; in one example, the biometric chip 100 is also It includes an analog front end 103, and the biometric detection module 102 is connected to each optical transmitter 200 and each optical receiver 300 through the analog front end 103. Wherein, the biometric chip 100 may also include a light transmitter 200 and/or a light receiver 300.

The skin color detection module 101 is used for automatically identifying the current skin color of the measured object.

The biometric detection module 102 is configured to control the light transmitter 200 to send a first initial light signal toward the object under test, and control the light receiver 300 to receive the first light signal after the first initial light signal passes through the object under test. Wherein, the analog front end 103 includes a driving module, and the biometric detection module 102 controls the light transmitter 200 to send the first initial light signal toward the measured object through the driving module. The light receiver 300 receives the light after passing the measured object, and The light is converted into a current signal, and then converted into a voltage signal by the analog front end 103, and the voltage signal is the first optical signal.

The biometrics detection module 102 is also used to obtain the biometrics of the detected object according to the current skin color and the first light signal.

In an example, the biometrics detection module 102 is configured to adjust the received first light signal according to the current skin color. Exemplarily, the biometrics detection module 102 is preset with a gain parameter, which can be adjusted according to the current skin color. Gain parameter, and then control the analog front end 103 to multiply the adjusted gain parameter by the first optical signal to obtain the adjusted first optical signal. Specifically, a gain parameter is preset in the biometric detection module 102. After the analog front end 103 obtains the first light signal, the biometric detection module 102 adjusts the preset gain according to the current skin color of the measured object identified by the skin color detection module 101 Parameters, and then send a control command including the adjusted gain parameter to the analog front end 103. After receiving the control command, the analog front end 103 multiplies the first optical signal by the adjusted gain parameter to obtain the adjusted first optical signal, The adjusted first light signal is adapted to the skin color of the measured object. Then, the biological feature detection module 102 can calculate the biological feature of the measured object based on the adjusted first light signal. Since the adjusted first light signal is compatible with the skin color of the measured object, the adjusted first light signal The signal is used to calculate that the biological characteristics of the measured object are compatible with the skin color of the measured object, which improves the accuracy of the calculated biological characteristics. Among them, the biological characteristics are, for example, heart rate, blood oxygen saturation, and the like.

Since the first embodiment corresponds to this embodiment, this embodiment can be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and the technical effects that can be achieved in the first embodiment can also be achieved in this embodiment. In order to reduce repetition, details are not repeated here. Correspondingly, the related technical details mentioned in this embodiment can also be applied in the first embodiment.

The seventh embodiment of the present application relates to an adaptive biometric detection device. Compared with the sixth embodiment, the main difference of this embodiment is that the intensity of the first initial light signal sent is adjusted.

In this embodiment, the biometric detection module 102 is also used to control the light transmitter 200 to send a first initial light signal toward the object under test, and control the light receiver 300 to receive the first initial light signal after the first initial light signal passes through the object under test. Before the light signal, adjust the driving of the light emitter 200 according to the current skin color to change the intensity of the first initial light signal emitted by the light emitter 200, and then control the light emitter 200 to emit the first initial light signal of this intensity, so that the light The intensity of the first initial light signal emitted by the transmitter 200 matches the skin color of the measured object. Specifically, the biometric detection module 102 is used to adjust the driving current of the driving module in the analog front end 103 to change the intensity of the first initial light signal emitted by the light emitter 200.

Since the second embodiment corresponds to this embodiment, this embodiment can be implemented in cooperation with the second embodiment. The related technical details mentioned in the second embodiment are still valid in this embodiment, and the technical effects that can be achieved in the second embodiment can also be achieved in this embodiment. In order to reduce repetition, details are not repeated here. Correspondingly, the related technical details mentioned in this embodiment can also be applied in the second embodiment.

Compared with the sixth embodiment, this embodiment can adjust the intensity of the first initial light signal emitted by the light emitter according to the current skin color, so that the intensity of the first initial light signal emitted by the light emitter is the same as the skin color of the object under test. Matching further improves the accuracy of the acquired biological characteristics.

The eighth embodiment of the present application relates to an adaptive biometric detection device. Compared with the sixth embodiment, the main difference of this embodiment is that it provides a specific implementation for automatically identifying the current skin color of the measured object. the way.

In this embodiment, referring to FIG. 13, the skin color detection module 101 is also connected to the analog front end 103.

When performing skin color detection, the biometric detection module 102 controls at least one light emitter 200 to send a second initial light signal toward the object under test, and controls at least one light receiver 300 to receive the second initial light signal after passing the object under test. Two optical signals. Specifically, when the skin color of the measured object is recognized, the biometric detection module 102 controls the light emitter 200 to send the second initial light signal toward the measured object through the driving module in the analog front end 103, and the second initial light signal passes through the measured object. After the skin tissue of the subject is reflected, scattered and absorbed, a part of the light is emitted from the skin of the subject. The light receiver 300 receives the emitted light, converts it into a current signal, and converts it into a voltage signal through the analog front end 103, which is the second Light signal.

The skin color detection module 101 receives the second light signal from the analog front end 103, and then obtains the current skin color of the measured object according to the second initial light signal and the second light signal. Specifically, the darker the skin color of the tested object, the lower the efficiency of light transmission, and the more light it absorbs. It can be seen that the second light signal can reflect the light absorbed by the skin of the tested object in the second initial light signal. Therefore, The skin color detection module 101 can obtain the current skin color of the measured object according to the second initial light signal and the second light signal, and the current skin color can represent the depth of the skin color of the measured object.

Since the third embodiment corresponds to this embodiment, this embodiment can be implemented in cooperation with the third embodiment. The related technical details mentioned in the third embodiment are still valid in this embodiment, and the technical effects that can be achieved in the third embodiment can also be achieved in this embodiment. In order to reduce repetition, details are not repeated here. Correspondingly, the related technical details mentioned in this embodiment can also be applied in the third embodiment.

Compared with the sixth embodiment, this embodiment provides a specific implementation manner for automatically identifying the current skin color of the measured object.

The ninth embodiment of the present application relates to an adaptive biological feature detection device. Compared with the eighth embodiment, the main difference of this embodiment is that it provides that according to the second initial optical signal and the second optical signal, A concrete realization of the current skin color of the measured object.

The skin color detection module 101 is configured to calculate the light absorption rate of the second initial light signal by the measured object according to the intensity of the second initial light signal and the intensity of the second light signal. Specifically, the skin color detection module 101 can obtain the intensity of the second initial light signal emitted by the biometric detection module 102 controlled by the light emitter, and at the same time can obtain the intensity of the second light signal received by the light receiver 300. The darker the skin color, the lower the light transmission efficiency, the more light absorbed by the skin, and the lower the intensity of the light signal after passing through the object under test. Therefore, the skin color detection module 101 can compare the intensity of the second initial light signal with the second light The intensity of the signal is used to calculate the light absorption rate of the measured object.

The skin color detection module 101 is configured to obtain the current skin color according to the light absorption rate and the corresponding relationship between the preset light absorption rate range and the skin color. Specifically, the skin color detection module 101 presets the corresponding relationship between the light absorption rate range and the skin color, so that the current skin color of the tested object can be obtained according to the calculated light absorption rate and the corresponding relationship.

Since the fourth embodiment corresponds to this embodiment, this embodiment can be implemented in cooperation with the fourth embodiment. The related technical details mentioned in the fourth embodiment are still valid in this embodiment, and the technical effects that can be achieved in the fourth embodiment can also be achieved in this embodiment. In order to reduce repetition, details are not repeated here. Correspondingly, the related technical details mentioned in this embodiment can also be applied in the fourth embodiment.

Compared with the eighth embodiment, this embodiment provides a specific implementation manner for obtaining the current skin color of the measured object according to the second initial light signal and the second light signal.

The tenth embodiment of the present application relates to an adaptive biological feature detection device. Compared with the eighth embodiment, the main difference of this embodiment is: according to the second initial optical signal and the second optical signal, the tested device is obtained. Another concrete realization of the object's current skin color.

In this embodiment, when performing skin color detection, the biometric detection module 102 is used to control multiple light emitters 200 to send multiple second initial light signals toward the measured object, and to receive each second light signal through at least one light receiver 300. Each second optical signal after the initial optical signal passes through the object under test. Specifically, each light transmitter 200 corresponds to a light receiver 300, and the biometric detection module 102 controls multiple light transmitters 200 to sequentially send out second initial light signals toward the object to be measured, and at the same time presets for receiving each light The optical receiver 300 of the second initial optical signal sent by the optical transmitter 200, therefore, when the biometric detection module 102 controls each optical transmitter 200 to send the second initial optical signal, it will simultaneously activate the corresponding optical receiver of each optical transmitter 200. The receiver 300 receives the second optical signal. Wherein, it can be set that each light emitter 200 is located in a different area, and the area position is the relative position of the light emitter 200 and the corresponding light receiver 200.

For each light emitter 200, the skin color detection module 101 is used to calculate the second initial light emitted by the object under test from the light emitter 200 according to the second initial light signal and the second light signal from the light emitter 200 The light absorption rate of the signal, so that the light absorption rate of the second initial light signal emitted by each light emitter 200 can be obtained.

The skin color detection module 101 is used to obtain the current skin color of the tested object according to the light absorption rate of the second initial light signal emitted by each emitter 200 by the tested object and the wavelength of the second initial light signal emitted by each light emitter 200.

In one example, the biometric detection module 102 can control multiple light emitters 200 to send multiple second initial light signals of different wavelengths toward the object to be measured, and control at least one light receiver 300 to receive each second initial light signal through For each second light signal after the object under test, the skin color detection module 101 can, based on the light absorption rate of the object under test for each second initial light signal and the difference in absorption of the second initial light signal of different wavelengths of the object under test, Get the current skin color of the tested object. Wherein, based on the difference in absorption of the second initial light signals of different wavelengths by the same skin color, the second initial light signals of multiple wavelengths are combined to determine the skin color of the measured object, thereby improving the accuracy of skin color detection.

In another example, the multiple light emitters 200 are in different regional positions, and the biometric detection module 102 can control the multiple light emitters 200 at different regional positions to emit a plurality of second initial lights of different wavelengths toward the measured object. The skin color detection module 101 can be based on the light absorption rate of each second initial light signal of the measured object, the position of the area where the multiple light emitters 200 are located, and the measured object’s response to the second initial light signal of different wavelengths. Absorb the difference to get the current skin color of the tested object. Among them, the current skin color of the tested object is obtained based on the difference in absorption of the second initial light signal emitted by the emitters located in different regions and the difference in absorption of the second initial light signal of different wavelengths by the same skin color, and further Improved the accuracy of skin color detection.

Since the fifth embodiment corresponds to this embodiment, this embodiment can be implemented in cooperation with the fifth embodiment. The related technical details mentioned in the fifth embodiment are still valid in this embodiment, and the technical effects that can be achieved in the fifth embodiment can also be achieved in this embodiment. In order to reduce repetition, details are not repeated here. Correspondingly, the related technical details mentioned in this embodiment can also be applied in the fifth embodiment.

Compared with the eighth embodiment, this embodiment is another specific implementation method for obtaining the current skin color of the measured object according to the second initial light signal and the second light signal, which can improve the obtained current skin color of the measured object. Accuracy.

The eleventh embodiment of the present application relates to an electronic device. The electronic device is a wearable device such as a watch and a bracelet. The electronic device includes the adaptive biometric detection device of any one of the fifth embodiment to the tenth embodiment .

Those of ordinary skill in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present application, and in actual applications, various changes can be made to them in form and details without departing from the spirit and spirit of the present application. range.

Claims

An adaptive biological feature detection method, characterized in that it comprises:

Automatically recognize the current skin color of the tested object;

Controlling the light transmitter to emit a first initial light signal toward the object under test, and controlling the light receiver to receive the first light signal after the first initial light signal passes through the object under test;

According to the current skin color and the first light signal, the biological characteristics of the measured object are obtained.
The adaptive biological feature detection method according to claim 1, wherein the obtaining the biological feature of the measured object according to the current skin color and the first light signal comprises:

Adjusting the received first light signal according to the current skin color;

According to the adjusted first light signal, the biological characteristic of the measured object is calculated.
The adaptive biological feature detection method according to claim 2, wherein the adjusting the received first light signal according to the current skin color comprises:

Adjust preset gain parameters according to the current skin color;

The adjusted gain parameter is multiplied by the first optical signal to obtain the adjusted first optical signal.
The adaptive biometric detection method according to claim 1, wherein the control light transmitter sends a first initial light signal toward the measured object, and controls the light receiver to receive the first initial light signal. Before the optical signal passes the first optical signal after the object under test, it also includes:

According to the current skin color, the driving of the light emitter is adjusted to change the intensity of the first initial light signal emitted by the light emitter.
The adaptive biological feature detection method according to claim 1, wherein before the automatic recognition of the current skin color of the measured object, the method further comprises:

Controlling at least one of the light emitters to emit a second initial light signal toward the object under test, and controlling at least one of the light receivers to receive the second light signal after the second initial light signal passes through the object under test;

The automatic recognition of the current skin color of the measured object includes:

According to the second initial light signal and the second light signal, the current skin color of the measured object is obtained.
The adaptive biological feature detection method of claim 5, wherein the obtaining the current skin color of the object under test according to the second initial light signal and the second light signal comprises :

Calculating the light absorption rate of the second initial light signal by the object under test according to the intensity of the second initial light signal and the intensity of the second light signal;

According to the corresponding relationship between the light absorption rate and the preset light absorption rate range and skin color, the current skin color is obtained.
The adaptive biological feature detection method according to claim 5, wherein said controlling at least one of said light emitters to send a second initial light signal towards the object under test, and controlling at least one of said light receivers to receive The second optical signal after the second initial optical signal passes through the measured object includes:

Control a plurality of light emitters to send a plurality of the second initial light signals toward the object under test, and control at least one of the light receivers to receive each of the second initial light signals after passing through the object under test. Second optical signal;

The obtaining the current skin color of the object under test according to the second initial light signal and the second light signal includes: for each light emitter, according to the light source from the light emitter Calculating the light absorption rate of the second initial light signal emitted by the light emitter by the measured object for the second initial light signal and the second light signal;

According to the light absorption rate of the second initial light signal emitted by each of the light emitters by the measured object and the wavelength of the second initial light signal emitted by each light emitter, the The current skin tone of the measured object.
8. The adaptive biological feature detection method according to claim 7, wherein said controlling multiple light emitters to send multiple said second initial light signals towards the measured object comprises:

Controlling a plurality of the optical transmitters to emit a plurality of the second initial optical signals of different wavelengths toward the object under test.
The adaptive biological feature detection method according to claim 8, wherein the light absorption rate and the respective light absorption rate of the second initial light signal sent by the measured object to each of the transmitters are The wavelength of the second initial light signal emitted by the light emitter to obtain the current skin color of the measured object includes:

According to the light absorption rate of each of the second initial light signals of the measured object and the difference in absorption of the second initial light signals of different wavelengths of the measured object, the measured object’s Current skin tone.
8. The adaptive biological feature detection method according to claim 8, wherein said controlling a plurality of light emitters to send a plurality of said second initial light signals towards a measured object comprises:

Control the plurality of the light emitters in different area positions to emit the second initial light signals of different wavelengths towards the object under test; the said light emitters according to the measured object send out the second initial light signals of different wavelengths; The light absorption rate of the second initial light signal and the wavelength of the second initial light signal emitted by each of the light emitters to obtain the current skin color of the measured object includes:

According to the light absorption rate of each of the second initial light signals of the measured object, the location of the area where the multiple light emitters are located, and the second initial light of the measured object to different wavelengths The absorption difference of the light signal obtains the current skin color of the measured object.
An adaptive biological feature detection device, which is characterized by comprising: a skin color detection module and a biological feature detection module;

The skin color detection module is used for automatically identifying the current skin color of the tested object;

The biometric detection module is used to control the light transmitter to send out a first initial light signal toward the measured object, and control the light receiver to receive the first light signal after the first initial light signal passes through the measured object ；

The biological feature detection module is further configured to obtain the biological feature of the measured object according to the current skin color and the first light signal.
11. The adaptive biological feature detection device according to claim 11, wherein the biological feature detection module is further configured to adjust the received first light signal according to the current skin color;

The biological feature detection module is further configured to calculate the biological feature of the measured object according to the adjusted first light signal.
The adaptive biological feature detection device according to claim 12, wherein the biological feature detection module is further configured to adjust a preset gain parameter according to the current skin color;

The biometric detection module is further configured to multiply the adjusted gain parameter by the first optical signal to obtain the adjusted first optical signal.
The adaptive biological feature detection device according to claim 13, wherein the biological feature detection module is further used to control the light emitter to send the first initial light signal towards the measured object, and to control the light receiving Before receiving the first light signal after the first initial light signal passes through the object under test, adjust the driving of the light emitter according to the current skin color to change the first light signal emitted by the light emitter. The intensity of an initial light signal.
The adaptive biometric detection device of claim 11, wherein the biometric detection module is further configured to control at least one of the light emitters to emit a second initial light signal toward the object to be measured, and to control at least The optical receiver receives the second optical signal after the second initial optical signal passes through the object under test;

The skin color detection module is configured to obtain the current skin color of the measured object according to the second initial light signal and the second light signal.
The adaptive biological feature detection device according to claim 15, wherein the skin color detection module is configured to calculate the mask according to the intensity of the second initial optical signal and the intensity of the second optical signal. The light absorption rate of the test object to the second initial light signal;

The skin color detection module is configured to obtain the current skin color according to the corresponding relationship between the light absorption rate and the preset light absorption rate range and skin color.
The self-adaptive biometric detection device of claim 15, wherein the biometric detection module is used to control a plurality of light emitters to send a plurality of the second initial light signals toward the measured object, and control At least one of the optical receivers receives each of the second optical signals after each of the second initial optical signals has passed through the object under test; the skin color detection module is used for each of the optical transmitters, according to the source Calculating the light absorption rate of the second initial light signal emitted by the light emitter by the measured object from the second initial light signal and the second light signal of the light emitter;

The skin color detection module is configured to use the light absorption rate of the second initial light signal emitted by each of the emitters by the measured object and the second initial light signal emitted by each of the light emitters To get the current skin color of the tested object.
The adaptive biological feature detection device according to claim 17, wherein the biological feature detection module is used to control a plurality of the light emitters to emit a plurality of the first wavelengths of different wavelengths toward the measured object. Two initial optical signals, and controlling at least one of the optical receivers to receive each of the second optical signals after each of the second initial optical signals passes through the object under test.
The self-adaptive biometric detection device according to claim 18, wherein the skin color detection module is used to detect the light absorption rate of each of the second initial light signals according to the measured object and the The difference in the absorption of the second initial light signals of different wavelengths of the object under test obtains the current skin color of the object under test.
The self-adaptive biometric detection device of claim 17, wherein the biometric detection module is used to control a plurality of the light emitters located in different regions to emit a plurality of different light emitters toward the measured object. The second initial optical signal of the wavelength; the area position is the relative position of the optical transmitter and the corresponding optical receiver;

The skin color detection module is used to detect the light absorption rate of each of the second initial light signals of the object under test, the location of the area where the plurality of light emitters are located, and the difference in the pair of the object under test. The absorption difference of the second initial light signal of the wavelength is used to obtain the current skin color of the measured object. 21. The adaptive biometric detection device of claim 11, wherein the adaptive biometric detection device further comprises at least one of the light receivers connected to the biometric detection module.
22. The adaptive biometric detection device of claim 21, wherein the adaptive biometric detection device further comprises at least one of the light emitters connected to the biometric detection module.
An electronic device, characterized by comprising: the self-adaptive biometric detection device according to any one of claims 11-22.