A wrist vein biometric identification device and identification method for wearable electronic device

Abstract

A wrist vein biometric identification device and identification method for a wearable electronic device, wherein a plate-type vein camera module is arranged in a wristband of the wearable electronic device, and the plate-type vein camera module is used to capture the wrist vein image of the user and identify the image, thereby realizing identification of the identity of the wearer of the wearable electronic device; the plate-type vein camera module is provided with a flat reflector for changing the light propagation direction of the captured wrist vein image, thereby greatly compressing the thickness of the plate-type vein camera module, so that the plate-type vein camera module can be arranged in a wristband with a relatively thin thickness; the wrist vein biometric identification device for the wearable electronic device recognizes the wrist vein image by jointly judging the overlap rate and synchronization correlation degree of several wrist local vein images with a wrist complete vein image, and has good recognition accuracy and low misjudgment rate when the local vein image has fewer features.

Description

Technical Field

[0001] The present invention relates to the technical field of body function data collection terminals in students' daily life and physical education teaching process, and in particular to a wrist vein biometric recognition device and recognition method for a wearable electronic device. Background Art

[0002] With the increasing emphasis on education in China, students are spending more and more time on study and less and less time on exercise, with the direct consequence that students' physical fitness is getting worse and worse. To reverse this situation, the domestic education department has introduced a double reduction policy to reduce students' learning burden and pressure, so that students have more time to participate in sports after class to improve their overall physical fitness. In addition, students' physical assessment will be included in the total score of the entrance examination to guide students to exercise in their daily lives. However, the above implementation methods are still insufficient and cannot effectively urge students to participate in physical exercise in their daily lives. If technical means are used to monitor and collect the time and intensity of students' physical exercise, and include it and the students' physical assessment results in the total score of the entrance examination, it can truly achieve the purpose of urging students to participate in physical exercise in their daily lives.

[0003] Currently, there are mature wearable electronic devices for recording human exercise time and intensity, such as smart watches; but there is a technical defect when using them to monitor and record students' daily physical exercise time and intensity: existing smart watches cannot detect the identity of the wearer, and there is a possibility of cheating when using them, that is, other people can wear smart watches to replace the monitored students' daily exercises and physical tests; if the wearer's identity detection function is added to the existing smart watches, the biometric technologies that can be used include fingerprint recognition, face recognition, iris recognition, finger vein recognition, etc., but there are technical obstacles when the above biometric technologies are applied to smart watches to detect the wearer's identity: when performing fingerprint recognition, face recognition, iris recognition, and finger vein recognition, the smart watch and the identified biometric features can be separated, that is, the smart watch can identify the biometric features of non-wearers, so there is a possibility of cheating; therefore, how to ensure that the smart watch and the wearer's identified biometric features are inseparable is the key to solving the problem of cheating by others wearing smart watches instead of monitored students.

[0004] Normally, a smart watch is worn on the user's wrist when in use. If the wearer's identity is identified by collecting the wearer's wrist vein characteristics, it has the excellent characteristic of inseparable wearable electronic device wearer and identified wrist vein biometric characteristics, so it is a better solution; however, there is a huge technical obstacle to integrating the vein recognition module into the wearable electronic device for detecting wrist vein characteristics: the dimension of the vein recognition module in the axis direction of its lens module is much larger than the thickness dimension of the existing wearable electronic device, and the vein recognition module cannot be integrated into the wearable electronic device or its affiliated structure to implement the photographing of the wearer's wrist veins; therefore, how to integrate the vein recognition module into the wearable electronic device or its affiliated structure, photograph the wrist vein characteristics of the wearer of the wearable electronic device and identify the user has become an urgent problem to be solved for the actual implementation of the wrist vein biometric recognition device of the wearable electronic device. Summary of the invention

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses a wrist vein biometric identification device for a wearable electronic device, wherein a plate-type vein camera module is arranged in the wristband of the wearable electronic device, and the plate-type vein camera module is used to capture the wrist vein image of the user and identify the image, thereby realizing identification of the identity of the wearer of the wearable electronic device; the plate-type vein camera module is provided with a flat reflector for changing the light propagation direction of the captured wrist vein image, thereby greatly compressing the thickness of the plate-type vein camera module, so that the plate-type vein camera module can be arranged in a wristband with a relatively thin thickness; the wrist vein biometric identification device for the wearable electronic device recognizes the wrist vein image through a comprehensive judgment of the overlap rate and synchronization correlation degree of several local vein images with the complete wrist vein image, and realizes better recognition accuracy and lower misjudgment rate when the local vein image has fewer features.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical scheme: a wrist vein biometric identification device of a wearable electronic device comprises a main wristband and an auxiliary wristband; the main wristband and the auxiliary wristband are connected to a smart watch for wearing the smart watch on the wrist of a user; the smart watch has functions such as clock, 4G communication, Bluetooth communication, radio frequency identification, mobile payment, heart rate monitoring and recording, sleep monitoring and recording and satellite positioning; the main wristband comprises a main wristband body and a plate-type vein camera module, the plate-type vein camera module is embedded in the main wristband body and electrically connected to the smart watch; several groups of camera modules are arranged in the plate-type vein camera module, and the lens axis of the camera module is arranged parallel to the wrist; before using the wrist vein biometric identification device of the wearable electronic device, the wrist vein image of the authorized user needs to be pre-recorded; the wrist vein image can be recorded by A dedicated device is used to capture a complete vein image of the authorized user's wrist, which is then transmitted to a smart watch for storage via a 4G communication network or Bluetooth communication. The wrist vein biometric device can also be set on the wrist of the authorized user, and the wrist vein biometric device is moved multiple times to capture multiple local vein images of the authorized user's wrist, and then a complete vein image of the user's wrist is synthesized. When the wrist vein biometric device of a wearable electronic device is used, it is worn on the user's wrist, and a plate-type vein camera module captures a local vein image of the wrist, which is then compared with the complete vein image of the wrist of the authorized user stored in the smart watch to determine whether the user of the wrist vein biometric device of the wearable electronic device is an authorized user, thereby preventing cheating by unauthorized users replacing authorized users in daily physical exercise.

[0007] Furthermore, the plate-type vein camera module includes a module bracket, a flat reflector, a camera module A, a camera module B and a protective glass; wherein the flat reflector is used to change the light propagation direction of the captured wrist vein image, compress the thickness of the plate-type vein camera module, so that it can be built-in in the wristband of the smart watch; the thickness of the flat reflector is set to be less than 3 mm, so the maximum width of the wrist vein image captured by the flat reflector is only 3 mm, and the wrist vein features contained in such a small wrist vein image width range are relatively few, which will cause the problem of low accuracy and high misjudgment rate of vein image recognition results. To solve this problem, in the present invention, the plate-type vein camera module is provided with two groups of camera modules and corresponding flat reflectors, so that two wrist vein images with fixed relative positions can be obtained, and the two wrist vein images with fixed relative positions are jointly compared and recognized, thereby greatly improving the accuracy of wrist vein image recognition and reducing the misjudgment rate;

[0008] The module bracket is the basic structural part of the plate-type vein camera module, and its purpose is to provide structural support for the flat reflector, camera module A, and camera module B; the module bracket is a rectangular frame with two rectangular through holes in the middle, camera module A and a flat reflector are fixedly arranged in one rectangular through hole, and camera module B and another flat reflector are fixedly arranged in the other rectangular through hole; the two rectangular through holes are respectively provided with a supporting inclined plane A and a supporting inclined plane B, and the supporting inclined plane A and the supporting inclined plane B are located on the side surfaces in the same direction of the two rectangular through holes. This structural setting of the supporting inclined plane A and the supporting inclined plane B makes the two captured wrist local vein images have a certain distance between them, and this distance makes the two wrist local vein images have a certain difference, which is conducive to improving the accuracy of the joint comparison and recognition results of the wrist vein images;

[0009] The flat reflector is in the shape of a flat plate, and its thickness is equal to that of the module bracket. A reflective bevel is provided on one side of the flat reflector, and the reflective bevel is coated with a total reflection film. The flat reflector uses the reflective bevel to change the propagation direction of infrared light, thereby realizing a structure in which the axis of the lens module in the camera module is set to be parallel to the photographed wrist, thereby achieving the purpose of compressing the thickness of the plate-type vein camera module and realizing that the plate-type vein camera module is built into the wristband; the flat reflector is fixedly set in the rectangular through hole of the module bracket, and the reflective bevel corresponds to the supporting bevel A and the supporting bevel B. The reflective bevel angle of the flat reflector is designed to be equal to the supporting bevel A and the supporting bevel B. The supporting bevel A and the supporting bevel B can be used as the assembly positioning and fixing surfaces of the flat reflector, thereby realizing the precise assembly of the flat reflector. Positioning and reliable fixation, the overall thickness of the plate-type vein camera module is reduced to the greatest extent, and the flat reflector is fixed to the module bracket by adhesive bonding; the plate surface corresponding to the reflective bevel is the working surface, and the protective glass is fixedly arranged on the working surface side of the flat reflector; when the plate-type vein camera module is working, the working surface is directly facing the wrist skin of the wearer of the wrist vein biometric identification device of the wearable electronic device, and the infrared light is emitted from the working surface, irradiated on the wrist of the wearer, and then enters the working surface after being reflected by the wrist; the side surface corresponding to the reflective bevel is provided with a camera surface and a fill light surface, the camera surface is located in the middle, and the fill light surface is located on both sides of the camera surface; the camera surface, fill light surface, and working surface of the flat reflector are light-transmitting surfaces, and the remaining surfaces are coated with a black light-absorbing film, and the black light-absorbing film is used to absorb infrared light outside the imaging surface to improve the final imaging quality;

[0010] The camera module A includes a camera module A soft film circuit board, an infrared LED and an infrared camera chip, wherein two infrared LEDs are provided; the infrared camera chip and the infrared LEDs are arranged in a linear shape and fixedly arranged on the camera module A soft film circuit board, and the infrared LEDs are located on both sides of the infrared camera chip; a lens module is fixedly arranged at the front end of the infrared camera chip;

[0011] The camera module B includes a camera module B soft film circuit board, an infrared LED, an infrared camera chip, and a lens module. The infrared camera chip, the infrared LED, and the lens module are arranged and fixed on the camera module B soft film circuit board in the same manner as the camera module A.

[0012] Camera module A and camera module B are fixed in the rectangular through-holes of the module bracket, the lens module corresponds to the camera surface, and the infrared LED corresponds to the fill light surface; the working principle of the plate-type vein camera module is as follows: the infrared LED emits infrared light, which enters the flat reflector through the fill light surface of the flat reflector, and then changes direction through the reflective bevel of the flat reflector, and is emitted from the working surface of the flat reflector, passes through the protective glass and vertically illuminates the wearer's wrist, re-enters the working surface of the flat reflector after reflection from the wrist, and then changes direction through the reflective bevel of the flat reflector, is transmitted in the flat reflector, and finally enters the lens module. After being focused by the lens module, an image is formed on the infrared camera chip; the superficial skin of the wearer's wrist There are abundant veins under the wrist. Since venous blood has a high absorption rate of infrared light, the infrared light reflected by the wrist contains the information of the veins under the superficial skin of the wearer's wrist, that is, the final imaging on the infrared camera chip is actually the local vein image of the wearer's wrist. The width of the local vein image of the wrist is the width of the working surface corresponding to the reflecting slope of the flat reflector, which is basically equal to the thickness of the flat reflector; the soft film circuit board of camera module B is electrically connected to the soft film circuit board of camera module A; when the plate-type vein camera module is working, camera module A and camera module B each independently take a local vein image of the wrist, which is transmitted to the smart watch via the soft film circuit board of camera module B and the soft film circuit board of camera module A.

[0013] Preferably, a structural setting is adopted in which the support bevel A and the support bevel B of the module bracket are located on the inner sides away from the two rectangular through holes. The two local wrist vein images taken are relatively far apart, so that the two local wrist vein images have more significant differences, and the accuracy of the recognition results can be significantly improved when the wrist vein images are jointly compared and recognized; however, this structural setting makes it difficult to collect complete vein images of the authorized user's wrist with a plate-type vein camera module, and the success rate is relatively low. Therefore, it is recommended to use proprietary equipment to collect complete vein images of the authorized user's wrist, and then transmit them to the smart watch for storage via the 4G communication network or Bluetooth communication.

[0014] Furthermore, the lens module includes a lens frame and a lens, wherein the lens is embedded in the lens frame; the lens adopts a GRIN cylindrical lens or a spherical lens or an aspherical lens.

[0015] Furthermore, the main wristband is built with a startup module, in which an ID code is preset, and the auxiliary wristband is built with a startup connection module, which is electrically connected to the smart watch; when the main wristband is connected to the auxiliary wristband, the startup module in the main wristband is connected to the smart watch through the startup connection module in the auxiliary wristband, and the smart watch determines the connection status of the main wristband and the auxiliary wristband by periodically reading the ID code stored in the startup module, and indirectly determines whether the wrist vein biometric identification device of the wearable electronic device is worn on the wrist; the purpose of setting the startup module and the startup connection module is to prevent the wrist vein biometric identification device of the wearable electronic device from being damaged. After confirming the authorized user through the wrist vein image, it is taken off and worn on the wrist of an unauthorized user to cheat during a short physical examination, thereby ensuring the accuracy and fairness of the physical examination results; when the wrist vein biometric device of the wearable electronic device is working normally, the plate-type vein camera module captures the wearer's wrist vein image for identification at a set period, and at the same time reads the ID code stored in the startup module at a set period to determine the wearing status of the wrist vein biometric device of the wearable electronic device, but the working cycle of the plate-type vein camera module is much longer than the cycle of reading the ID code stored in the startup module.

[0016] Furthermore, the start-up module includes a soft film circuit board, a strong magnet electrode and an identification chip, the strong magnet electrode and the identification chip are fixedly arranged on the soft film circuit board, and the strong magnet electrode is electrically connected to the identification chip; the start-up module is embedded in the main wristband away from the smart watch end, and the strong magnet electrode is exposed on the surface of the main wristband body; the auxiliary wristband includes an auxiliary wristband body and a start-up connection module, the auxiliary wristband body is made of flexible material, the start-up connection module includes a start-up connection module soft film circuit board and a connection electrode, and the connection electrode is fixedly arranged on the start-up connection module soft film circuit board; the start-up connection module is embedded in It is embedded in the auxiliary wristband body, and the connecting electrode is exposed on the surface of the auxiliary wristband body; there are several groups of connecting electrodes, which are arranged along the length direction of the auxiliary wristband. When the connecting electrodes of different groups are adsorbed with the strong magnet electrodes, the connection length between the main wristband and the auxiliary wristband can be adjusted to adapt to the wrist diameters of different wearers; one end of the soft film circuit board of the starting connection module extends out of the auxiliary wristband body and is electrically connected to the smart watch; when the strong magnet electrode of the main wristband and the connecting electrode of the auxiliary wristband are correspondingly attracted, the starting module in the main wristband is electrically connected to the smart watch through the starting connection module of the auxiliary wristband.

[0017] Furthermore, an ambient light sensor is provided on the start-up module, and the ambient light sensor is used to assist in detecting whether the wrist vein biometric device of the wearable electronic device is out of the wearing state; when the wrist vein biometric device of the wearable electronic device is normally worn on the wrist of the authorized user, the ambient light sensor will be blocked by the wrist, and at this time the ambient light sensor has no output signal. When the authorized user takes off the wrist vein biometric device of the wearable electronic device, the ambient light sensor will detect the surrounding light and output a signal to the smart watch. At this time, the identity recognition authentication of the original wearer will be invalid, and the wearer's wrist vein image must be re-compared to determine whether the user of the wrist vein biometric device of the wearable electronic device is an authorized user; in addition, when the ambient light sensor detects the surrounding light and outputs a signal to the smart watch, the smart watch will stop detecting the ID code in the start-up module and taking the wearer's wrist vein image for comparison and recognition, so as to save the power consumption of the smart watch and extend the standby time.

[0018] A method for identifying a wrist vein biometric identification device of a wearable electronic device comprises the following steps:

[0019] S1. Recording of wrist vein images of authorized users: Turn on the smart watch and send an encrypted wrist vein image acquisition instruction to the smart watch via Bluetooth; attach the protective glass of the plate-type vein camera module to the wrist, move the plate-type vein camera module along the direction of the forearm several times, take a synthetic wrist vein image of the authorized user, store it in the smart watch, and upload it to the back-end monitoring cloud platform via the 4G communication network;

[0020] S2. Confirmation of the wearing status of the wrist vein biometric identification device of the wearable electronic device: The smart watch is placed on the wrist of the authorized user, and the main wristband and the auxiliary wristband are wrapped around the wrist, so that the strong magnet electrode of the main wristband and the connection electrode of the auxiliary wristband are correspondingly attracted, and the start-up module in the main wristband is electrically connected to the smart watch through the start-up connection module of the auxiliary wristband; at this time, the ambient light sensor has no output signal, and the smart watch determines the connection status of the main wristband and the auxiliary wristband by reading the ID code stored in the start-up module, and indirectly determines whether the wrist vein biometric identification device of the wearable electronic device is worn on the wrist;

[0021] S3. Identification of the wearer's identity of the wrist vein biometric device of a wearable electronic device: When it is determined that the wrist vein biometric device of the wearable electronic device is worn on the wrist, the plate-type vein camera module periodically captures the wearer's wrist vein image, and compares it with the wrist vein image of the authorized user stored in the smart watch to determine whether the wearer of the wrist vein biometric device of the wearable electronic device is an authorized user; if the wrist vein biometric device of the wearable electronic device determines that the wearer is an authorized user, the heart rate monitoring and recording function of the smart watch is turned on, and the heart rate monitoring and recording results are regularly uploaded to the back-end monitoring cloud platform through the 4G communication network; if the wrist vein biometric device of the wearable electronic device determines that the wearer is an unauthorized user, the wrist vein image of the wearer captured by the plate-type vein camera module is uploaded to the back-end monitoring cloud platform through the 4G communication network, and the back-end monitoring cloud platform compares the stored wrist vein image of the authorized user to determine the identity of the unauthorized user, and sends a warning message to the smart watch through the 4G communication network.

[0022] Furthermore, the specific method of identifying the wearer's identity of the wrist vein biometric identification device of the wearable electronic device is:

[0023] S31, binarizing the complete vein image of the authorized user's wrist to obtain a binary image of the complete vein of the authorized user's wrist; then refining the binary image of the complete vein of the authorized user's wrist to obtain a refined image of the complete vein of the authorized user's wrist; the complete vein image of the authorized user's wrist, the binary image of the complete vein of the authorized user's wrist and the refined image of the complete vein of the authorized user's wrist are all stored in the smart watch;

[0024] S32. When the smart watch determines that the wrist vein biometric identification device of the wearable electronic device is worn on the wrist, the plate-type vein camera module captures the vein image of the wrist of the wearer, and obtains the local vein image A and the local vein image B through the camera module A and the camera module B; performs binarization processing on the local vein image A and the local vein image B to obtain the local vein binary image A and the local vein binary image B; then performs refinement processing on the local vein binary image A and the local vein binary image B to obtain the local vein refinement image A and the local vein refinement image B; and uses the camera module A to obtain the local vein refinement image A and the local vein refinement image B. , the relative position of the camera module B, the local vein binary image A and the local vein binary image B are merged into a local vein binary image, and the local vein thinning image A and the local vein thinning image B are merged into a local vein thinning image; it is supplemented that: the local vein binary image only contains the image and relative position information of the local vein binary image A and the local vein binary image B, and other image information except the local vein binary image A and the local vein binary image B does not participate in the image comparison and recognition process, so as to reduce the calculation amount of image comparison and recognition;

[0025] S33, a fixed thread is made in the middle of the local vein thinning image A or the local vein thinning image B in the width direction, the fixed thread intersects with the thin line in the local vein thinning image A or the local vein thinning image B to generate a thread intersection point, and the fixed thread intersection point and the thickest vein thread intersection point are used as the origin O; the origin O of the local vein thinning image is used as the reference point, and the thinning line of the thickest vein in the authorized user's wrist complete vein thinning image is used as the trajectory, so that the local vein binary image slides in the authorized user's wrist complete vein binary image; when the overlap rate of the local vein binary image A and the authorized user's wrist complete vein binary image reaches a maximum , and exceeds the set threshold, the coincidence rate of the local vein binary image B and the complete vein binary image of the authorized user's wrist also reaches the maximum value and exceeds the set threshold, then the wearer of the wrist vein biometric recognition device of the wearable electronic device is determined to be an authorized user; if the coincidence rate of the local vein binary image A, the local vein binary image B and the complete vein binary image of the authorized user's wrist cannot reach the maximum value simultaneously, or the coincidence rate is always lower than the set threshold, then the wearer of the wrist vein biometric recognition device of the wearable electronic device is determined to be an unauthorized user; Supplementary explanation: 1. When the wrist vein biometric recognition device of the wearable electronic device is worn In the identification of the wearer, the origin O of the local vein thinning image is used as the reference point, and the thinning line of the thickest vein in the complete vein thinning image of the authorized user's wrist is used as the trajectory, so that the local vein binary image slides in the complete vein binary image of the authorized user's wrist, the purpose of which is to reduce the image matching calculation amount and shorten the identification time; second, when the overlap rate of the local vein binary image A and the complete vein binary image of the authorized user's wrist reaches the maximum value and exceeds the set threshold, the overlap rate of the local vein binary image B and the complete vein binary image of the authorized user's wrist also reaches the maximum value and exceeds the set threshold, it is determined that the wearer is a wearable. The determination condition for whether the wearer of the wrist vein biometric device worn by an electronic device is an authorized user is essentially a three-dimensional joint determination condition, namely, a comprehensive judgment of the degree of correlation of the three dimensions of the overlap rate of local vein binary image A, the overlap rate of local vein binary image B, and the synchronous reaching of the maximum value. Among them, the synchronous reaching of the maximum value is a correlation dimension generated based on the feature that the relative positions of local vein image A and local vein image B are fixed, which is used to exclude the possible non-correlated maximum values ​​of the overlap rate of local vein binary image A or the overlap rate of local vein binary image B, so as to improve the accuracy of the comparison and recognition results and reduce the misjudgment rate.

[0026] Due to the adoption of the technical scheme as described above, the present invention has the following beneficial effects: the present invention discloses a wrist vein biometric identification device for a wearable electronic device, in which a plate-type vein camera module is arranged in the wristband of the wearable electronic device, and the plate-type vein camera module is used to capture the user's wrist vein image and identify it, thereby realizing the identification of the identity of the wearer of the wearable electronic device; the plate-type vein camera module is provided with a flat reflector for changing the light propagation direction of the captured wrist vein image, thereby greatly compressing the thickness of the plate-type vein camera module, so that the plate-type vein camera module can be arranged in a wristband with a relatively thin thickness; before using the wrist vein biometric identification device for a wearable electronic device, the wrist vein image of the authorized user is first pre-recorded in the smart watch used in conjunction with the wearable electronic device, and when in use, the wrist vein biometric identification device for the wearable electronic device periodically captures the wrist vein image of the user. , and compare it with the wrist vein image of the authorized user stored in the smart watch to determine whether the user of the wrist vein biometric device of the wearable electronic device is the authorized user, thereby preventing other people from wearing the wrist vein biometric device of the wearable electronic device to replace the authorized user to participate in daily physical exercise. In addition, a startup module and a startup connection module are set in the main wristband and the auxiliary wristband of the wrist vein biometric device of the wearable electronic device. The smart watch detects the ID number set in the startup module through the startup connection module to determine the dynamic connection status of the main wristband and the auxiliary wristband, thereby preventing the wrist vein biometric device of the wearable electronic device from temporarily removing the wrist vein biometric device of the wearable electronic device to replace the user for physical examination after confirming the authorized user through the wrist vein image, thereby ensuring the accuracy and fairness of the physical examination results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Illustration of the wrist vein biometric device for wearable electronic devices Figure 1 ;

[0028] Figure 2 Illustration of the wrist vein biometric device for wearable electronic devices Figure 2 ;

[0029] Figure 3 Illustration of the wrist vein biometric device for wearable electronic devices Figure 3 ;

[0030] Figure 4 This is a schematic diagram of the main wristband appearance;

[0031] Figure 5 This is a partial cutaway diagram of the main wristband;

[0032] Figure 6 This is a schematic diagram of the appearance of a plate-type vein camera module;

[0033] Figure 7 It is a schematic diagram of the exploded structure of the plate-type vein camera module;

[0034] Figure 8 It is a schematic diagram of the module bracket structure;

[0035] Fig. 9 It is a schematic diagram of the optimal structure of the module bracket;

[0036] Fig.10 Schematic diagram of the appearance of a flat reflector;

[0037] Fig.11 This is a schematic diagram of the appearance of camera module A;

[0038] Fig.12 This is a schematic diagram of the explosion structure of camera module A;

[0039] Fig.13 This is a schematic diagram of the lens module explosion;

[0040] Fig.14 This is a schematic diagram of the appearance of camera module B;

[0041] Fig.15 It is a schematic diagram of the cross-sectional structure of a plate-type vein camera module;

[0042] Fig.16 This is a schematic diagram of the appearance of the startup module;

[0043] Fig.17 This is a schematic diagram of the appearance of the wristband;

[0044] Fig.18 It is a partial cutaway diagram of the wristband;

[0045] Fig.19 This is a schematic diagram of the appearance of the startup connection module;

[0046] Fig. 20 This is a schematic diagram of the working principle of the plate-type vein camera module;

[0047] Fig.21 This is a schematic diagram of the wrist vein recognition process;

[0048] Fig. 22 This is a schematic diagram of wrist vein recognition results.

[0049] In the figure: 1. Main wristband; 1.1. Main wristband body; 1.2. Plate-type venous camera module; 1.2.1. Module bracket; 1.2.1.1. Support slope A; 1.2.1.2. Support slope B; 1.2.2. Flat reflector; 1.2.2.1. Reflection slope; 1.2.2.2. Camera surface; 1.2.2.3. Fill light surface; 1.2.2.4. Working surface; 1.2.3. Camera module A; 1.2.3.1. Camera module A soft film circuit board; 1.2.3.2. Infrared LED ; 1.2.3.3, lens module; 1.2.3.3.1, lens frame; 1.2.3.3.2, lens; 1.2.3.4, infrared camera chip; 1.2.4, camera module B; 1.2.4.1, camera module B soft film circuit board; 1.2.5, protective glass; 1.3, start module; 1.3.1, start module soft film circuit board; 1.3.2, strong magnet electrode; 1.3.3, identification chip; 2, wristband; 2. 1. Wristband body; 2.2. Start connection module; 2.2.1. Start connection module soft film circuit board; 2.2.2. Connect electrodes; 3. Smart watch; 4. Wrist veins; 5. Complete wrist vein binary image of authorized user; 5.1. Complete wrist vein refinement image of authorized user; 6. Local vein binary image A; 7. Local vein binary image B; 6.1. Local vein refinement image A; 7.1. Local vein refinement image B. DETAILED DESCRIPTION

[0050] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0051] A wrist vein biometric identification device for a wearable electronic device comprises a main wristband 1 and an auxiliary wristband 2, wherein the main wristband 1 and the auxiliary wristband 2 are connected to a smart watch 3 and are used to be worn on the wrist; the smart watch 3 has functions such as clock, 4G communication network, Bluetooth communication, radio frequency identification, payment, heart rate monitoring and recording, sleep monitoring and recording, and satellite positioning; the main wristband 1 comprises a main wristband body 1.1 and a plate-type vein camera module 1.2, wherein the plate-type vein camera module 1.2 is embedded in the main wristband body 1.1 and is electrically connected to the smart watch 3;

[0052] The plate-type venous camera module 1.2 includes a module bracket 1.2.1, a flat reflector 1.2.2, a camera module A1.2.3, a camera module B1.2.4 and a protective glass 1.2.5; the module bracket 1.2.1 is a rectangular frame with two rectangular through holes in the middle, and the two rectangular through holes are respectively provided with supporting inclined planes A1.2.1.1 and supporting inclined planes B1.2.1.2, and the supporting inclined planes A1.2.1.1 and supporting inclined planes B1.2.1.2 are located on the sides of the two rectangular through holes in the same direction; the flat reflector 1.2.2 is a flat plate with the same thickness as the module bracket 1.2.1, and one side of the flat reflector 1.2.2 is provided with a reflecting inclined plane 1.2.2.1, and the reflecting inclined plane 1.2.2.1 is coated with a total reflection film. The angle of the reflecting bevel 1.2.2.1 is equal to that of the supporting bevel A1.2.1.1 and the supporting bevel B1.2.1.2; the plate surface corresponding to the reflecting bevel 1.2.2.1 is the working surface 1.2.2.4; the side surface corresponding to the reflecting bevel 1.2.2.1 is provided with a camera surface 1.2.2.2 and a fill light surface 1.2.2.3, the camera surface 1.2.2.2 is located in the middle, and the fill light surfaces 1.2.2.3 are located on both sides of the camera surface 1.2.2.2; the reflecting bevel 1.2.2.1 of the flat reflector 1.2.2 is coated with a reflective film, the camera surface 1.2.2.2, the fill light surface 1.2.2.3 and the working surface 1.2.2.4 are translucent surfaces, and the other surfaces are coated with a black light-absorbing film; the flat reflector 1.2.2 is fixedly arranged on the module bracket In the rectangular through hole of 1.2.1, the reflecting bevel 1.2.2.1 corresponds to the supporting bevel A1.2.1.1 and the supporting bevel B1.2.1.2, and the protective glass 1.2.5 is fixedly arranged on the working surface 1.2.2.4 side of the flat reflector 1.2.2; the camera module A1.2.3 includes the camera module A soft film circuit board 1.2.3.1, the infrared LED 1.2.3.2 and the infrared camera chip 1.2.3.4, and the infrared LED 1.2.3.2 is provided with two; the infrared camera chip 1.2.3.4 and the infrared LED 1.2.3.2 are arranged in a linear shape and fixedly arranged on the camera module A soft film circuit board 1.2.3.1, and the infrared LED 1.2.3.2 is located at the infrared camera chip 1.2.3. 4 on both sides; the front end of the infrared camera chip 1.2.3.4 is fixedly provided with a lens module 1.2.3.3; the camera module B 1.2.4 includes the camera module B soft film circuit board 1.2.4.1, the infrared LED 1.2.3.2, the infrared camera chip 1.2.3.4 and the lens module 1.2.3.3, and the setting and fixing method of the infrared camera chip 1.2.3.4, the infrared LED 1.2.3.2 and the lens module 1.2.3.3 on the camera module B soft film circuit board 1.2.4.1 is the same as that of the camera module A 1.2.3; the camera module A 1.2.3 and the camera module B 1.2.4 are fixedly provided in the rectangular through hole of the module bracket 1.2.1, and the lens module 1.2.3.3 is connected to the camera surface 1.2.2.2, the infrared LED 1.2.3.2 corresponds to the fill light surface 1.2.2.3; the camera module B soft film circuit board 1.2.4.1 is electrically connected to the camera module A soft film circuit board 1.2.3.1, and one end of the camera module B soft film circuit 1.2.4.1) extends out of the main wristband body 1.1 and is electrically connected to the smart watch 3; the lens module 1.2.3.3 includes a lens frame 1.2.3.3.1 and a lens 1.2.3.3.2, and the lens 1.2.3.3.2 is embedded in the lens frame 1.2.3.3.1; the lens 1.2.3.3.2 adopts a GRIN cylindrical lens;.

[0053] The main wristband 1 also has a built-in start-up module 1.3, which includes a start-up module soft film circuit board 1.3.1, a strong magnet electrode 1.3.2 and an identification chip 1.3.3. The identification chip 1.3.3 is preset with an ID code. The strong magnet electrode 1.3.2 and the identification chip 1.3.3 are fixedly arranged on the start-up module soft film circuit board 1.3.1, and the strong magnet electrode 1.3.2 is electrically connected to the identification chip 1.3.3; the start-up module 1.3 is embedded in the main wristband 1 at the end away from the smart watch 3, and the strong magnet electrode 1.3.2 is exposed on the surface of the main wristband body 1.1; the auxiliary wristband 2 includes an auxiliary wristband body 2.1 and a start-up connection module 2.2, and the start-up connection module 2.2 is electrically connected to the smart watch 3; the auxiliary wristband body 2. 1 adopts flexible materials, and the starting connection module 2.2 includes a starting connection module soft film circuit board 2.2.1 and a connecting electrode 2.2.2, and the connecting electrode 2.2.2 is fixedly arranged on the starting connection module soft film circuit board 2.2.1; the starting connection module 2.2 is embedded in the auxiliary wristband body 2.1, and the connecting electrode 2.2.2 is exposed on the surface of the auxiliary wristband body 2.1; one end of the starting connection module soft film circuit board 2.2.1 extends out of the auxiliary wristband body 2.1 and is electrically connected to the smart watch 3; when the strong magnet electrode 1.3.2 of the main wristband 1 is correspondingly attracted with the connecting electrode 2.2.2 of the auxiliary wristband 2, the starting module 1.3 in the main wristband 1 is electrically connected to the smart watch 3 through the starting connection module 2.2 of the auxiliary wristband 2.

[0054] A method for identifying a wrist vein biometric identification device of a wearable electronic device comprises the following steps:

[0055] S1. Recording of wrist vein 4 image of authorized user: Turn on smart watch 3, and send encrypted wrist vein 4 image acquisition instruction to smart watch 3 via Bluetooth; Stick the protective glass 1.2.5 of plate-type vein camera module 1.2 on the wrist, move the plate-type vein camera module 1.2 along the direction of forearm for many times, and take the complete vein image of the wrist of the authorized user through the plate-type vein camera module 1.2, store it in smart watch 3, and upload it to the back-end monitoring cloud platform via 4G communication network;

[0056] S2. Confirmation of the wearing status of the wrist vein biometric identification device of the wearable electronic device: the smart watch 3 is placed on the wrist of the authorized user, and the main wristband 1 and the auxiliary wristband 2 are wrapped around the wrist, so that the strong magnet electrode 1.3.2 of the main wristband 1 and the connection electrode 2.2.2 of the auxiliary wristband 2 are correspondingly attracted, and the start-up module 1.3 in the main wristband 1 is electrically connected to the smart watch 3 through the start-up connection module 2.2 of the auxiliary wristband 2; the smart watch 3 determines the connection status of the main wristband 1 and the auxiliary wristband 2 by reading the ID code stored in the start-up module 1.3, and indirectly determines whether the wrist vein biometric identification device of the wearable electronic device is worn on the wrist;

[0057] S3, identification of the wearer of the wrist vein biometric identification device of the wearable electronic device: the plate-type vein camera module 1.2 periodically captures the wrist vein image of the wearer, and compares it with the wrist vein image of the authorized user stored in the smart watch 3 to determine whether the wearer of the wrist vein biometric identification device of the wearable electronic device is an authorized user; if the wrist vein biometric identification device of the wearable electronic device determines that the wearer is an authorized user, the heart rate monitoring and recording function of the smart watch 3 is turned on, and the heart rate monitoring and recording results are regularly uploaded to the back-end monitoring cloud platform through the 4G communication network; if the wrist vein biometric identification device of the wearable electronic device determines that the wearer is an unauthorized user, the wrist vein image of the wearer captured by the plate-type vein camera module 1.2 is uploaded to the back-end monitoring cloud platform through the 4G communication network, and the back-end monitoring cloud platform compares the stored wrist vein image 4 of the authorized user to determine the identity of the unauthorized user, and sends a warning message to the smart watch 3 through the 4G communication network;

[0058] The specific method of identifying the wearer of the wrist vein biometric device of a wearable electronic device is:

[0059] S31, binarizing the authorized user's wrist complete vein image to obtain the authorized user's wrist complete vein binary image 5; then refining the authorized user's wrist complete vein binary image 5 to obtain the authorized user's wrist complete vein refined image 5.1; the authorized user's wrist complete vein image, the authorized user's wrist complete vein binary image 5 and the authorized user's wrist complete vein refined image 5.1 are all stored in the smart watch 3;

[0060] S32, when the smart watch 3 determines that the wrist vein biometric identification device of the wearable electronic device is worn on the wrist, the plate-type vein camera module 1.2 captures the vein image of the wearer's wrist, and obtains the local vein image A and the local vein image B through the camera module A1.2.3 and the camera module B1.2.4; the local vein image A and the local vein image B are binarized to obtain the local vein binarized image A6 and the local vein binarized image B7; the local vein binarized image A6 and the local vein binarized image B7 are then refined to obtain the local vein refined image A6.1 and the local vein refined image B7.1; based on the relative positions of the camera module A1.2.3 and the camera module B1.2.4, the local vein binarized image A6 and the local vein binarized image B7 are merged into a local vein binarized image 8, and the local vein refined image A6.1 and the local vein refined image B7.1 are merged into a local vein refined image 8.1;

[0061] S33, make a fixed thread in the middle of the local vein thinning image A6.1 in the width direction, the fixed thread intersects with the thin line in the local vein thinning image A6.1 to generate a thread intersection point, and take the fixed thread intersection point and the thread intersection point of the thickest vein as the origin O; take the origin O of the local vein thinning image 8.1 as the reference point, take the thinning line of the thickest vein in the authorized user's wrist complete vein thinning image 5.1 as the trajectory, and slide the local vein binary image 8 in the authorized user's wrist complete vein binary image 5; when the local vein binary image A6 and the authorized user's wrist complete vein binary image 5 are aligned, When the overlap rate reaches the maximum value and exceeds the set threshold, the overlap rate of the local vein binary image B7 and the complete vein binary image 5 of the authorized user's wrist also reaches the maximum value synchronously and exceeds the set threshold, then the wearer of the wrist vein biometric identification device of the wearable electronic device is determined to be an authorized user; if the overlap rate of the local vein binary image A6, the local vein binary image B7 and the complete vein binary image 5 of the authorized user's wrist cannot reach the maximum value synchronously, or the overlap rate is always lower than the set threshold, then the wearer of the wrist vein biometric identification device of the wearable electronic device is determined to be an unauthorized user.

[0062] The parts not described in detail in this invention are prior art.

Claims

1. A wrist vein biometric identification device for a wearable electronic device, comprising a main wristband (1) and an auxiliary wristband (2); the main wristband (1) and the auxiliary wristband (2) are connected to a smart watch (3) for wearing the smart watch (3) on the wrist of a user; the smart watch (3) has clock, 4G communication, Bluetooth communication, radio frequency identification, mobile payment, heart rate monitoring and recording, sleep monitoring and recording, and satellite positioning functions; Its characteristics are: The main wristband (1) comprises a main wristband body (1.1) and a plate-type vein camera module (1.2). The plate-type vein camera module (1.2) is embedded in the main wristband body (1.1) and electrically connected to a smart watch (3). The plate-type vein camera module (1.2) is provided with a plurality of camera modules, and the lens axis of the camera module is arranged parallel to the wrist. The main wristband (1) also has a built-in start module (1.3), and an ID code is preset in the start module (1.3). The auxiliary wristband (2) comprises an auxiliary wristband body (2.1) and a start module (1.3). The main wristband (1) and the auxiliary wristband (2) are connected to each other via the start-up module (1.3). The start-up module (2.2) is built into the auxiliary wristband body (2.1). The start-up module (2.2) is electrically connected to the smart watch (3). When the main wristband (1) and the auxiliary wristband (2) are connected, the start-up module (1.3) in the main wristband (1) is connected to the smart watch (3) via the start-up module (2.2) in the auxiliary wristband (2). The smart watch (3) determines the connection state between the main wristband (1) and the auxiliary wristband (2) by reading the ID code stored in the start-up module (1.3).

2. The wrist vein biometric recognition device for a wearable electronic device according to claim 1, Its characteristics are: The plate-type venous camera module (1.2) comprises a module bracket (1.2.1), a flat reflector (1.2.2), a camera module A (1.2.3), a camera module B (1.2.4) and a protective glass (1.2.5); The module bracket (1.2.1) is in the shape of a rectangular frame, with two rectangular through holes in the middle, and the two rectangular through holes are respectively provided with a supporting inclined surface A (1.2.1.1) and a supporting inclined surface B (1.2.1.2), and the supporting inclined surface A (1.2.1.1) and the supporting inclined surface B (1.2.1.2) are located on the sides of the two rectangular through holes in the same direction; The flat reflector (1.2.2) is in the shape of a flat plate. A reflecting bevel (1.2.2.1) is provided on one side of the flat reflector (1.2.2). The angle of the reflecting bevel (1.2.2.1) is equal to that of the supporting bevel A (1.2.1.1) and the supporting bevel B (1.2.1.2). The plate surface corresponding to the reflecting bevel (1.2.2.1) is a working surface (1.2.2.4). A camera surface (1.2.2.2) and a fill light surface (1.2.2.3) are provided on the side corresponding to the reflecting bevel (1.2.2.1). The camera surface (1.2.2.2) is located in the middle, and the fill light surface (1.2.2.3) is located between the camera surface (1.2.2 .2) on both sides; the reflective bevel (1.2.2.1) of the flat reflector (1.2.2) is coated with a reflective film, the camera surface (1.2.2.2), the fill light surface (1.2.2.3) and the working surface (1.2.2.4) are light-transmitting surfaces, and the remaining surfaces are coated with a black light-absorbing film; the flat reflector (1.2.2) is fixedly set in the rectangular through hole of the module bracket (1.2.1), and the reflective bevel (1.2.2.1) corresponds to the supporting bevel A (1.2.1.1) and the supporting bevel B (1.2.1.2); the protective glass (1.2.5) is fixedly set on the working surface (1.2.2.4) side of the flat reflector (1.2.2); The camera module A (1.2.3) includes a camera module A soft film circuit board (1.2.3.1), an infrared LED (1.2.3.2) and an infrared camera chip (1.2.3.4), wherein two infrared LEDs (1.2.3.2) are provided; the infrared camera chip (1.2.3.4) and the infrared LED (1.2.3.2) are fixedly arranged on the camera module A soft film circuit board (1.2.3.1), and the infrared LED (1.2.3.2) is located on both sides of the infrared camera chip (1.2.3.4); a lens module (1.2.3.3) is fixedly arranged at the front end of the infrared camera chip (1.2.3.4); The camera module B (1.2.4) includes a camera module B soft film circuit board (1.2.4.1), an infrared LED (1.2.3.2), an infrared camera chip (1.2.3.4) and a lens module (1.2.3.3). The infrared camera chip (1.2.3.4), the infrared LED (1.2.3.2) and the lens module (1.2.3.3) are arranged and fixed on the camera module B soft film circuit board (1.2.4.1) in the same manner as the camera module A (1.2.3); The camera module A (1.2.3) and the camera module B (1.2.4) are fixedly arranged in the rectangular through hole of the module bracket (1.2.1); the lens module (1.2.3.3) corresponds to the camera surface (1.2.2.2) of the flat reflector (1.2.2); the infrared LED (1.2.3.2) corresponds to the fill light surface (1.2.2.3) of the flat reflector (1.2.2); the camera module B soft film circuit board (1.2.4.1) is electrically connected to the camera module A soft film circuit board (1.2.3.1); One end of the soft film circuit board (1.2.4.1) of the camera module B extends out of the main wristband body (1.1) and is electrically connected to the smart watch (3).

3. The wrist vein biometric recognition device for a wearable electronic device according to claim 2, Its characteristics are: The supporting inclined surface A (1.2.1.1) and the supporting inclined surface B (1.2.1.2) of the module bracket (1.2.1) are located on the inner side surfaces away from the two rectangular through holes.

4. The wrist vein biometric recognition device for a wearable electronic device according to claim 2, Its characteristics are: The lens module (1.2.3.3) includes a lens frame (1.2.3.3.1) and a lens (1.2.3.3.2), wherein the lens (1.2.3.3.2) is embedded in the lens frame (1.2.3.3.1); the lens (1.2.3.3.2) adopts a GRIN cylindrical lens, a spherical lens or an aspherical lens.

5. The wrist vein biometric identification device for a wearable electronic device according to claim 3 or 4, Its characteristics are: The start-up module (1.3) comprises a start-up module soft film circuit board (1.3.1), a strong magnet electrode (1.3.2) and an identification chip (1.3.3); the strong magnet electrode (1.3.2) and the identification chip (1.3.3) are fixedly arranged on the start-up module soft film circuit board (1.3.1), and the strong magnet electrode (1.3.2) and the identification chip (1.3.3) are electrically connected; the start-up module (1.3) is embedded in the end of the main wristband (1) away from the smart watch (3), and the strong magnet electrode (1.3.2) is exposed on the surface of the main wristband body (1.1); The start-up connection module (2.2) comprises a start-up connection module soft film circuit board (2.2.1) and a connection electrode (2.2.2), wherein the connection electrode (2.2.2) is fixedly arranged on the start-up connection module soft film circuit board (2.2.1); the start-up connection module (2.2) is embedded in the auxiliary wristband body (2.1), and the connection electrode (2.2.2) is exposed from the surface of the start-up connection module soft film circuit board (2.2.1); one end of the start-up connection module soft film circuit board (2.2.1) extends out of the auxiliary wristband body (2.1) and is electrically connected to the smart watch (3); When the strong magnet electrode (1.3.2) of the main wristband (1) and the connection electrode (2.2.2) of the auxiliary wristband (2) are correspondingly attracted, the start-up module (1.3) in the main wristband (1) is electrically connected to the smart watch (3) via the start-up connection module (2.2) of the auxiliary wristband (2).

6. The wrist vein biometric recognition device for a wearable electronic device according to claim 5, Its characteristics are: An ambient light sensor is provided on the startup connection module soft film circuit board (2.2.1) of the startup connection module (2.2), and the ambient light sensor is electrically connected to the smart watch (3) through the startup connection module soft film circuit board (2.2.1).

7. The identification method based on the wrist vein biometric identification device of the wearable electronic device according to claim 6, Its characteristics are: The following steps are involved: S1. Recording the image of the wrist vein (4) of the authorized user: Turn on the smart watch (3), and send an encrypted wrist vein (4) image acquisition instruction to the smart watch (3) via Bluetooth; attach the protective glass (1.2.5) of the plate-type vein camera module (1.2) to the wrist, move the plate-type vein camera module (1.2) along the direction of the forearm several times, and use the plate-type vein camera module (1.2) to capture the complete vein image of the wrist of the authorized user, store it in the smart watch (3), and upload it to the back-end monitoring cloud platform via the 4G communication network; S2. Confirmation of the wearing status of the wrist vein biometric identification device of the wearable electronic device: the smart watch (3) is placed on the wrist of the authorized user, and the main wristband (1) and the auxiliary wristband (2) are wrapped around the wrist, so that the strong magnet electrode (1.3.2) of the main wristband (1) and the connection electrode (2.2.2) of the auxiliary wristband (2) are correspondingly attracted, and the start-up module (1.3) in the main wristband (1) is electrically connected to the smart watch (3) through the start-up connection module (2.2) of the auxiliary wristband (2); the smart watch (3) determines the connection status of the main wristband (1) and the auxiliary wristband (2) by reading the ID code stored in the start-up module (1.3), and indirectly determines whether the wrist vein biometric identification device of the wearable electronic device is worn on the wrist; S3. Identification of the wearer's identity by the wrist vein biometric identification device of the wearable electronic device: the plate-type vein camera module (1.2) periodically captures the image of the wearer's wrist vein, and compares it with the wrist vein image of the authorized user stored in the smart watch (3), to determine whether the wearer of the wrist vein biometric identification device of the wearable electronic device is an authorized user; if the wrist vein biometric identification device of the wearable electronic device determines that the wearer is an authorized user, the heart rate monitoring and recording function of the smart watch (3) is activated, and the heart rate monitoring and recording results are periodically uploaded to the back-end monitoring cloud platform via the 4G communication network; if the wrist vein biometric identification device of the wearable electronic device determines that the wearer is an unauthorized user, the wrist vein image of the wearer captured by the plate-type vein camera module (1.2) is uploaded to the back-end monitoring cloud platform via the 4G communication network, and the back-end monitoring cloud platform compares it with the stored image of the wrist vein (4) of the authorized user, determines the identity of the unauthorized user, and sends a warning message to the smart watch (3) via the 4G communication network.

8. The identification method of the wrist vein biometric identification device of a wearable electronic device according to claim 7, Its characteristics are: The specific method of identifying the wearer of the wrist vein biometric device of a wearable electronic device is: S31, binarizing the complete vein image of the authorized user's wrist to obtain a binarized complete vein image of the authorized user's wrist (5); then refining the binarized complete vein image of the authorized user's wrist (5) to obtain a refined complete vein image of the authorized user's wrist (5.1); the complete vein image of the authorized user's wrist, the binarized complete vein image of the authorized user's wrist (5) and the refined complete vein image of the authorized user's wrist (5.1) are all stored in the smart watch (3); S32, when the smart watch (3) determines that the wrist vein biometric identification device of the wearable electronic device is worn on the wrist, the plate-type vein camera module (1.2) captures the vein image of the wrist of the wearer, and obtains the local vein image A and the local vein image B through the camera module B (1.2.4) and the camera module B (1.2.4); performs binarization processing on the local vein image A and the local vein image B to obtain the local vein binary image A (6) and the local vein binary image B (7); and then performs binarization processing on the local vein binary image A (6) and the local vein binary image B (7); The local vein binary image B (7) is refined to obtain a local vein refined image A (6.1) and a local vein refined image B (7.1); based on the relative positions of the camera module A (1.2.3) and the camera module B (1.2.4), the local vein binary image A (6) and the local vein binary image B (7) are merged into a local vein binary image (8), and the local vein refined image A (6.1) and the local vein refined image B (7.1) are merged into a local vein refined image (8.1); S33, a fixed thread is made in the middle of the local vein thinning image A (6.1) or the local vein thinning image B (7.1) in the width direction, and the fixed thread intersects with the thin line in the local vein thinning image A (6.1) or the local vein thinning image B (7.1) to generate a thread intersection point; the intersection point between the fixed thread and the thread of the thickest vein is taken as the origin O, the origin O of the local vein thinning image (8.1) is taken as the reference point, and the thinning line of the thickest vein in the complete vein thinning image (5.1) of the wrist of the authorized user is taken as the trajectory, The local vein binary image (8) is slid in the complete vein binary image (5) of the wrist of the authorized user; when the overlap rate between the local vein binary image A (6) and the complete vein binary image (5) of the wrist of the authorized user reaches a maximum value and exceeds a set threshold, the overlap rate between the local vein binary image B (7) and the complete vein binary image (5) of the wrist of the authorized user also reaches a maximum value and exceeds the set threshold, then the wearer of the wrist vein biometric identification device of the wearable electronic device is determined to be an authorized user.

Images