Biometric recognition method, biometric recognition system and electronic device

Abstract

The present invention provides a biometric recognition method, a biometric recognition system, and an electronic device, which can take into account both the target area and the background area in different application scenarios to ensure the image quality. The biometric recognition method includes the steps of: obtaining an image to be recognized, where the image to be recognized is acquired by an image sensor through a variable color filter device; respectively performing virtual partitioning on the image to be recognized and the variable color filter device to construct a one-to-one mapping relationship between the image virtual partition and the color filter virtual partition; performing image quality detection on the image to be recognized to determine, based on the mapping relationship, the color filter virtual partition corresponding to the image virtual partition in the image to be recognized that does not meet the quality requirements as the color filter partition to be adjusted of the variable color filter device; and correspondingly adjusting the voltage value of the color filter partition to be adjusted to change the light passing rate of the variable color filter device at the color filter partition to be adjusted, so that the image quality meets the requirements.

Description

Technical Field

[0001] This application relates to the field of biometric technologies, and particularly to a biometric identification method, a biometric identification system, and an electronic device. Background Art

[0002] With the development of intelligent vision sensors and biometric technologies, the application scenarios of biometric identification technologies are becoming increasingly extensive. However, different application scenarios often have different lighting conditions, which may affect the accuracy of biometric identification. In particular, the glare and stray light generated under strong light will greatly reduce the passing rate of biometric identification.

[0003] To reduce the impact of strong outdoor light, an existing high-precision indoor and outdoor exposure adjustment method first obtains images by taking pictures with the projector turned off or on respectively to obtain the target area, and then makes adjustments according to the target area; although it is possible to accurately adjust the exposure of the human body part without identifying indoors or outdoors, this method needs to be adjusted according to the target area and does not consider the information of the background area, making it difficult to ensure the image quality. Summary of the Invention

[0004] One advantage of this application is to provide a biometric identification method, a biometric identification system, and an electronic device, which can take into account both the target area and the background area in different application scenarios to ensure the image quality.

[0005] Another advantage of this application is to provide a biometric identification method, a biometric identification system, and an electronic device. In one embodiment of this application, the biometric identification method can correspondingly adjust the voltages of different partitions of the variable color filter device according to the brightness of the image partitions to meet the different requirements of different application scenarios.

[0006] Another advantage of this application is to provide a biometric identification method, a biometric identification system, and an electronic device. In one embodiment of this application, the biometric identification method can detect overexposure of the image partitions and correspondingly adjust the light passing rate of the corresponding areas on the variable color filter device to improve the image quality.

[0007] Another advantage of this invention is to provide a biometric identification method, a biometric identification system, and an electronic device. To achieve the above purpose, complex structures and designs are not required in this invention. Therefore, this invention successfully and effectively provides a solution, not only providing a simple biometric identification method, a biometric identification system, and an electronic device, but also increasing the practicality and reliability of the biometric identification method, the biometric identification system, and the electronic device.

[0008] To achieve at least one of the above advantages or other advantages and purposes of the present invention, the present invention provides a biometric recognition method, including the steps:

[0009] Obtain an image to be recognized, where the image to be recognized is collected by an image sensor through a variable color filter device;

[0010] Perform virtual partitioning on the image to be recognized and the variable color filter device respectively to construct a one-to-one mapping relationship between the image virtual partition of the image to be recognized and the color filter virtual partition of the variable color filter device;

[0011] Perform image quality detection on the image to be recognized to determine, based on the mapping relationship, the color filter virtual partition corresponding to the image virtual partition in the image to be recognized that does not meet the quality requirements as the color filter adjustment partition of the variable color filter device; and

[0012] Correspondingly adjust the voltage value of the color filter adjustment partition to change the light passing rate of the variable color filter device at the color filter adjustment partition so that the image quality meets the requirements.

[0013] According to an embodiment of the present application, before the step of obtaining the image to be recognized, it further includes the step of: physically dividing the variable color filter device into n×m physical partitions arranged in an array, where the physical partitions are respectively controlled by relatively independent positive and negative circuits.

[0014] According to an embodiment of the present application, the step of performing virtual partitioning on the image to be recognized and the variable color filter device respectively includes the steps of:

[0015] Perform virtual partitioning on the image to be recognized to form a plurality of image virtual partitions arranged in an array;

[0016] Perform virtual partitioning on the variable color filter device to form color filter virtual partitions corresponding one-to-one to the image virtual partitions, where each color filter virtual partition includes one or more physical partitions; and

[0017] Based on the resolution of the image sensor, construct the mapping relationship between the image virtual partition and the color filter virtual partition.

[0018] According to an embodiment of the present application, the step of performing image quality detection on the image to be recognized includes the steps of:

[0019] Perform full-image quality detection on the image to be recognized to determine whether it meets the image quality requirements: if so, directly perform biometric recognition; if not, determine the area in the image to be recognized where the brightness does not meet the preset value as the image adjustment area;

[0020] Determine the image virtual partition to which the area to be adjusted in the image belongs, as the image virtual partition that does not meet the quality requirements; and

[0021] Based on the mapping relationship, find the color filter virtual partition on the variable color filter device corresponding to the image virtual partition that does not meet the quality requirements, as the color filter area to be adjusted.

[0022] According to an embodiment of the present application, the step of correspondingly adjusting the voltage value of the color filter area to be adjusted includes the steps of:

[0023] Adjust the duty cycle of the voltage applied to the physical partitions in the color filter area to be adjusted through a pulse width modulation signal to change the light passing rate of the variable color filter device at the color filter area to be adjusted; and

[0024] Re-acquire the image to be recognized, and perform partition quality detection on the re-acquired image to be recognized to determine whether the corresponding image virtual partition meets the image quality requirements: if so, perform biometric recognition; if not, loop to adjust the duty cycle until the image quality requirements are met.

[0025] According to another aspect of the present application, the present application further provides a biometric recognition system, including an image acquisition module and a processing module that are communicably connected to each other;

[0026] Wherein the image acquisition module includes an image sensor and a variable color filter device arranged in the light sensing path of the image sensor, and the image sensor is used to collect image information through the variable color filter device to obtain the image to be recognized;

[0027] And the processing module includes:

[0028] A virtual partition module, communicably connected to the image sensor, for respectively performing virtual partitioning on the image to be recognized and the variable color filter device to construct a one-to-one mapping relationship between the image virtual partition of the image to be recognized and the color filter virtual partition of the variable color filter device;

[0029] A quality detection module, communicably connected to the image sensor and the virtual partition module, for performing image quality detection on the image to be recognized to determine, based on the mapping relationship, the color filter virtual partition corresponding to the image virtual partition that does not meet the quality requirements in the image to be recognized, as the color filter area to be adjusted of the variable color filter device; and

[0030] A voltage adjustment module, communicably connected to the quality detection module and the variable color filter device, for correspondingly adjusting the voltage value of the color filter area to be adjusted to change the light passing rate of the variable color filter device at the color filter area to be adjusted so that the image quality meets the requirements.

[0031] According to an embodiment of the present application, the variable color filter device includes a pair of transparent electrode layers and at least one electrochromic layer disposed between the two transparent electrode layers.

[0032] According to an embodiment of the present application, the transparent electrode layers in the variable color filter device are arranged in a plurality of partition circuits that are independently controlled from each other, so as to physically divide the variable color filter device into a physical partition matrix.

[0033] According to an embodiment of the present application, each color filter virtual partition includes one or more physical partitions that are independently controlled by adjustable voltages respectively.

[0034] According to another aspect of the present application, the present application further provides an electronic device, including:

[0035] The device body; and

[0036] The biometric recognition system described above, and the biometric recognition system is assembled on the device body.

[0037] In summary, when performing image quality detection on the image to be recognized, if it is found that the image quality of a certain image virtual partition in the image to be recognized does not meet the quality requirements, then according to the above mapping relationship, the color filter adjustment partition on the variable color filter device can be easily determined, and then the voltage applied to the color filter adjustment partition on the variable color filter device is adjusted, so that the light transmittance at the color filter adjustment partition on the variable color filter device is changed until the image collected by the image sensor through the variable color filter device meets the image quality requirements, so as to adapt to the requirements of different application scenarios.

[0038] In addition, the biometric recognition method of the present application also performs virtual partitioning on the image to be recognized and the variable color filter device respectively, so as to determine the color filter virtual partition corresponding to the image virtual partition with unqualified image quality in the image to be recognized as the color filter adjustment partition of the variable color filter device, which is convenient for specifically adjusting the light transmittance of the color filter adjustment partition on the variable color filter device, without the need to adjust the color filter virtual partition corresponding to the image virtual partition with qualified image quality on the variable color filter device, which helps to take into account the target area and the background area and ensure the image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a flowchart of a biometric recognition method according to an embodiment of the present application;

[0040] Figure 2 shows a flowchart of the virtual partitioning step in the biometric recognition method according to the above embodiment of the present application;

[0041] Figure 3 Shows a schematic flowchart of the quality detection step in the biometric recognition method according to the above embodiments of the present application;

[0042] Figure 4 Shows a schematic flowchart of the voltage regulation step in the biometric recognition method according to the above embodiments of the present application;

[0043] Figure 5A Shows an example of the image to be recognized before virtual partitioning in the biometric recognition method according to the above embodiments of the present application;

[0044] Figure 5B Shows an example of the image to be recognized after virtual partitioning in the biometric recognition method according to the above embodiments of the present application;

[0045] Figure 5C Shows an example of the variable color filter device after mapping in the biometric recognition method according to the above embodiments of the present application;

[0046] Figure 6 Is a schematic structural diagram of a biometric recognition system according to an embodiment of the present application;

[0047] Figure 7 Shows an example of the variable color filter device in the biometric recognition system according to the above embodiments of the present application;

[0048] Figure 8 Shows an example of the transparent electrode layer in the variable color filter device after physical segmentation according to the above embodiments of the present application;

[0049] Figure 9 Shows an example of the mapping relationship between the variable color filter device and the image to be recognized according to the above embodiments of the present application;

[0050] Figure 10 Shows another example of the mapping relationship between the variable color filter device and the image to be recognized according to the above embodiments of the present application;

[0051] Figure 11 Shows yet another example of the mapping relationship between the variable color filter device and the image to be recognized according to the above embodiments of the present application;

[0052] Figure 12 Is a schematic block diagram of an electronic device according to an embodiment of the present application.

[0053] Main element symbol description:

[0054] 10. Image acquisition module; 11. Image sensor; 110. Image virtual partition; 12. Variable color filter device; 120. Color filter virtual partition; 121. Transparent electrode layer; 1210. Physical partition; 122. Electrochromic layer; 20. Processing module; 21. Virtual partition module; 22. Quality detection module; 23. Voltage regulation module; 30. Device body.

[0055] The above description of the main component symbols further elaborates on the present invention in conjunction with the accompanying drawings and specific embodiments. Specific embodiments

[0056] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes without departing from the spirit and scope of the present invention.

[0057] In the present invention, the term "a" in the claims and the specification should be understood as "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of this element can be multiple. Unless it is clearly indicated in the disclosure of the present invention that the number of this element is only one, the term "a" cannot be understood as being unique or single, and the term "a" cannot be understood as a limitation on the number.

[0058] In the description of the present invention, it should be understood that terms such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be a direct connection, or an indirect connection through a medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0060] Considering that in order to reduce the influence of outdoor strong light, the existing biometric recognition solutions first obtain images by taking pictures separately with the projector turned off or on to obtain the target area, and then adjust according to the target area, so that it is not necessary to identify whether it is indoor or outdoor to accurately adjust the exposure of the human body part. However, this solution needs to be adjusted according to the target area and does not consider the information of the background area, making it difficult to guarantee the image quality. In view of this, the present application creatively proposes a biometric recognition method, a biometric recognition system, and an electronic device, which can take into account both the target area and the background area in different application scenarios to guarantee the image quality.

[0061] Specifically, referring to the accompanying drawings of the specification of the present application Figure 1 , according to an embodiment of the present application, a biometric recognition method is provided, which may include the steps:

[0062] S100: Obtain an image to be recognized, where the image to be recognized is collected by an image sensor through a variable color filter device;

[0063] S200: Perform virtual partitioning on the image to be recognized and the variable color filter device respectively to construct a mapping relationship in which the image virtual partition of the image to be recognized corresponds one-to-one with the color filter virtual partition of the variable color filter device;

[0064] S300: Perform image quality detection on the image to be recognized to determine, based on the mapping relationship, the color filter virtual partition corresponding to the image virtual partition in the image to be recognized that does not meet the quality requirements as the color filter adjustment partition to be adjusted of the variable color filter device; and

[0065] S400: Correspondingly adjust the voltage value of the color filter adjustment partition to change the light passing rate of the variable color filter device at the color filter adjustment partition so that the image quality meets the requirements.

[0066] It should be noted that since the image virtual partitions of the image to be recognized correspond one-to-one to the color filter virtual partitions of the variable color filter device, when performing image quality detection on the image to be recognized, if it is found that the image quality of a certain image virtual partition in the image to be recognized does not meet the quality requirements (such as the brightness of a certain image virtual partition does not meet the preset value), then according to the above mapping relationship, it is possible to easily determine the color filter partition to be adjusted on the variable color filter device, and then adjust the voltage applied at the color filter partition to be adjusted on the variable color filter device, so that the light transmittance at the color filter partition to be adjusted on the variable color filter device is changed until the image collected by the image sensor through the variable color filter device meets the image quality requirements to adapt to the needs of different application scenarios. In other words, the light transmittance of different color filter virtual partitions on the variable color filter device is adjusted according to the voltage, and the voltage value is determined according to the brightness value of the corresponding image virtual partition on the image to be recognized. Therefore, the voltage of the variable color filter device in this application can be adaptively adjusted according to the different needs of different application scenarios.

[0067] In addition, the biometric recognition method of this application also performs virtual partitioning on the image to be recognized and the variable color filter device respectively to determine the color filter virtual partition corresponding to the image virtual partition that does not meet the quality requirements in the image to be recognized as the color filter partition to be adjusted on the variable color filter device, which is convenient for targeted adjustment of the light transmittance of the color filter partition to be adjusted on the variable color filter device, without the need to adjust the color filter virtual partition corresponding to the image virtual partition that meets the quality requirements on the variable color filter device, which helps to take into account the target area and the background area and ensure the image quality. It can be understood that if the voltages of all partitions of the variable color filter device are adjusted as a whole, although the image virtual partition corresponding to the color filter partition to be adjusted meets the image quality requirements, the image virtual partitions corresponding to other color filter virtual partitions may not meet the image quality requirements due to the change of the light transmittance.

[0068] Exemplarily, before step S100 of the biometric recognition method of this application, it further includes the step of physically dividing the variable color filter device into n×m physical partitions arranged in an array, where the physical partitions are respectively controlled by relatively independent positive and negative circuit switches to facilitate targeted control of the voltage adjustment of the color filter partition to be adjusted on the variable color filter device, so that the light transmittance of the color filter partition to be adjusted is correspondingly adjusted and controlled.

[0069] Optionally, as Figure 2 shown, step S200 of the biometric recognition method of this application may include the steps:

[0070] S210: Perform virtual partitioning on the image to be recognized to form a plurality of image virtual partitions arranged in an array;

[0071] S220: Virtually partition the variable color filter device to form color filter virtual partitions that correspond one-to-one with the virtual image partitions, where each color filter virtual partition includes one or more physical partitions; and

[0072] S230: Based on the resolution of the image sensor, construct a mapping relationship between the virtual image partitions and the color filter virtual partitions.

[0073] Optionally, as Figure 3 shown, step S300 of the biometric recognition method of this application may include the steps:

[0074] S310: Perform full-image quality detection on the image to be recognized to determine whether it meets the image quality requirements: If so, directly perform biometric recognition; if not, determine the area in the image to be recognized where the brightness does not meet the preset value as the image area to be adjusted;

[0075] S320: Determine the virtual image partition to which the image area to be adjusted belongs as the virtual image partition that does not meet the quality requirements; and

[0076] S330: Based on the mapping relationship, find the color filter virtual partition on the variable color filter device that corresponds to the virtual image partition that does not meet the quality requirements as the color filter partition to be adjusted.

[0077] It should be noted that in step S310 of the biometric recognition method of this application: The area in the image to be recognized where the brightness does not meet the preset value can be found through an image quality detection algorithm as the image area to be adjusted. Correspondingly, in step S330 of the biometric recognition method of this application: The starting point of the pixels in the image area to be adjusted in the image to be recognized can be detected through an algorithm first, and then the starting point of the color filter virtual partition can be found through the mapping relationship, so as to determine the color filter partition to be adjusted in the variable color filter device.

[0078] In addition, in step S400 of the biometric recognition method of this application: The color filter partition to be adjusted in this application can, but is not limited to, change the magnitude of the voltage value by adjusting the duty cycle of the voltage through a Pulse Width Modulation (PWM) signal of a System on Chip (SoC), so as to change the light passing rate of the variable color filter device at the color filter partition to be adjusted.

[0079] Optionally, as Figure 4 shown, step S400 of the biometric recognition method of this application may include the steps:

[0080] S410: Adjust the voltage duty cycle applied to the physical partitions in the color filter partition to be adjusted by a pulse width modulation signal, so as to change the light passing rate of the variable color filter device at the color filter partition to be adjusted; and

[0081] S420: Re-acquire the image to be recognized, and perform partition quality detection on the re-acquired image to be recognized to determine whether the corresponding image virtual partition meets the image quality requirements: if so, perform biometric recognition; if not, repeatedly adjust the voltage duty cycle until the image quality requirements are met.

[0082] It should be noted that the biometric recognition method of the present application performs partition quality detection on the re-acquired image to be recognized in this step S420, which is beneficial to reducing the calculation amount of quality detection and improving the biometric recognition efficiency. Of course, in other examples of the present application, the biometric recognition method of the present application can also perform full-image quality detection on the re-acquired image to be recognized, and the present application will not elaborate on this.

[0083] For example, after the biometric recognition method of the present application acquires the image to be recognized as shown in Figure 5A , first perform virtual partitioning on the image to be recognized to obtain the 1st to 16th image virtual partitions arranged in an array as shown in Figure 5B , then perform image quality detection on the image to be recognized to determine that the yellow area in the image to be recognized as shown in Figure 5B does not meet the quality requirements and is used as the image area to be adjusted, and further determine that the image virtual partitions to which the image area to be adjusted belongs are the 2nd and 6th image virtual partitions in the image to be recognized as shown in Figure 5B ; then, based on the mapping relationship, determine the 2nd and 6th color filter virtual partitions in the variable color filter as shown in Figure 5C as the color filter partitions to be adjusted of the variable color filter device; finally, adaptively adjust the voltage values of the 2nd and 6th color filter virtual partitions respectively to change the light passing rate of the variable color filter device at the 2nd and 6th color filter virtual partitions until the image quality meets the requirements.

[0084] It is worth mentioning that, according to another aspect of the present application, as shown in Figure 6As shown, the present application further provides a biometric recognition system, which may include an image acquisition module 10 and a processing module 20 that are communicatively connected to each other. The image acquisition module 10 includes an image sensor 11 and a variable color filter device 12 disposed in the light sensing path of the image sensor 11, wherein the image sensor 11 is configured to acquire image information through the variable color filter device 12 to obtain an image to be recognized. The processing module 20 includes a virtual partitioning module 21, a quality detection module 22, and a voltage regulation module 23; the virtual partitioning module 21 is communicatively connected to the image sensor 11 and is configured to perform virtual partitioning on the image to be recognized and the variable color filter device 12 respectively to construct a mapping relationship in which the image virtual partition of the image to be recognized corresponds one-to-one to the color filter virtual partition of the variable color filter device 12; the quality detection module 22 is communicatively connected to the image sensor 11 and is configured to perform image quality detection on the image to be recognized obtained through the image sensor 11 to determine, based on the mapping relationship, the color filter virtual partition corresponding to the image virtual partition in the image to be recognized that does not meet the quality requirements as the color filter partition to be adjusted of the variable color filter device; the voltage regulation module 23 is communicatively connected to the variable color filter device 12 and is configured to correspondingly adjust the voltage value of the color filter partition to be adjusted to change the light passing rate of the variable color filter device 12 at the color filter partition to be adjusted, so that the image quality meets the requirements.

[0085] It should be noted that, in an example of the present application, as Figure 6 shown, the variable color filter device 12 may be attached to the light sensing surface of the image sensor 11. It can be understood that Figure 6 shown is only one application example, but in other examples of the present application, the variable color filter device 12 may also be arranged at intervals from the image sensor 11, and the present application does not limit the specific positional relationship between the image sensor 11 and the variable color filter device 12.

[0086] Exemplarily, as Figure 7As shown, the variable color filter device 12 may include a pair of transparent electrode layers 121 and at least one electrochromic layer 122 disposed between the two transparent electrode layers 121. In this way, when a voltage is applied to the electrochromic layer 122 through the two transparent electrode layers 121, the absorption spectrum of the electrochromic layer 122 will change, thereby changing the light transmittance of the variable color filter device 12; when the voltage is removed, the electrochromic layer 122 will return to its original absorption spectrum, causing the variable color filter device 12 to return to its original light transmittance. It can be understood that the electrochromic layer 122 mentioned in this application may but is not limited to being implemented as a polymer, gel or inorganic material containing specific chemical substances, ensuring that the electrochromic material can return to its original state after the voltage is removed and ensuring that the state change is reversible. In addition, the transparent electrode layer 121 mentioned in this application may but is not limited to being implemented as glass coated with an electrode circuit.

[0087] Optionally, the transparent electrode layer 121 in the variable color filter device 12 is arranged by a plurality of partition circuits that are independently controlled to physically divide the variable color filter device 12 into a physical partition matrix.

[0088] Optionally, as Figure 8 shown, each color filter virtual partition 120 in the variable color filter device 12 may include a plurality of physical partitions 1210 that are independently controlled by adjustable voltages. For example, as Figure 8 shown, the variable color filter device 12 may be divided into a physical partition matrix of n×m, that is, the variable color filter device 12 may include n×m physical partitions 1210 arranged in an array. At the same time, as Figure 9 shown, each color filter virtual partition 120 may include 3×4 physical partitions 1210; or, as Figure 10 shown, each color filter virtual partition 120 may also include 3×2 physical partitions 1210. Correspondingly, since the image virtual partition 110 corresponds one-to-one to the color filter virtual partition 120, therefore as Figure 9 and Figure 10 shown, each image virtual partition 110 corresponds to 3×4 physical partitions 1210 or 3×2 physical partitions 1210. In this way, when a certain image virtual partition 110 does not meet the image quality requirements during image quality detection, the color filter virtual partition 120 corresponding to the image virtual partition 110 that does not meet the quality requirements is determined based on the mapping relationship as the color filter to-be-adjusted partition, and then the voltages of all the physical partitions 1210 in the color filter to-be-adjusted partition are adjusted to change the light transmittance of the variable color filter device 12 at the color filter to-be-adjusted partition until the image virtual partition 110 corresponding to the color filter to-be-adjusted partition meets the image quality requirements.

[0089] It should be noted that, in other examples of this application, each color filter virtual partition 120 may also only include one physical partition 1210, that is, the color filter virtual partition 120 corresponds to the physical partition 1210 one by one. For example, as Figure 11 shown, the variable color filter device 12 can be divided into an n×m physical partition matrix, that is, the variable color filter device 12 may include n×m physical partitions 1210 arranged in an array. At the same time, as Figure 11 shown, each color filter virtual partition 120 may include one physical partition 1210.

[0090] It is worth mentioning that, according to another aspect of this application, as Figure 12 shown, this application may further provide an electronic device, which may include the above biometric recognition system and the device body 30. The biometric recognition system is assembled on the device body 30 and is used to control the device body 30 to execute corresponding functions when biometric recognition is successful, such as unlocking, security protection, mobile payment, identity verification, intelligent interaction or real-name authentication and other functions.

[0091] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should all be considered as the scope described in this specification.

[0092] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A biometric recognition method, characterized in that, Including the steps: Obtain an image to be recognized, where the image to be recognized is acquired by an image sensor through a variable color filter device; Perform virtual partitioning on the image to be recognized and the variable color filter device respectively to construct a mapping relationship in which the image virtual partition of the image to be recognized corresponds one-to-one with the color filter virtual partition of the variable color filter device; Perform image quality detection on the image to be recognized to determine, based on the mapping relationship, the color filter virtual partition corresponding to the image virtual partition in the image to be recognized that does not meet the quality requirements as the color filter partition to be adjusted of the variable color filter device; And Correspondingly adjust the voltage value of the color filter partition to be adjusted to change the light passing rate of the variable color filter device at the color filter partition to be adjusted, so that the image quality meets the requirements for biometric recognition; The step of correspondingly adjusting the voltage value of the color filter partition to be adjusted includes the steps: Re-obtain the image to be recognized and perform partition quality detection on the re-obtained image to be recognized to determine whether the corresponding image virtual partition meets the image quality requirements: if so, perform biometric recognition; if not, repeatedly adjust the voltage value of the color filter partition to be adjusted until the image quality requirements are met.

2. The biometric recognition method according to claim 1, wherein Before the step of obtaining the image to be recognized, it further includes the step: physically divide the variable color filter device into n×m physical partitions arranged in an array, where the physical partitions are respectively controlled by relatively independent positive and negative electrode circuits.

3. The biometric recognition method according to claim 2, characterized in that, The step of performing virtual partitioning on the image to be recognized and the variable color filter device respectively includes the steps: Perform virtual partitioning on the image to be recognized to form a plurality of image virtual partitions arranged in an array; Perform virtual partitioning on the variable color filter device to form color filter virtual partitions corresponding one-to-one with the image virtual partitions, where each color filter virtual partition includes one or more physical partitions; And Based on the resolution of the image sensor, construct a mapping relationship between the image virtual partition and the color filter virtual partition.

4. The biometric recognition method according to any one of claims 1 to 3, characterized in that, The step of performing image quality detection on the image to be recognized includes the steps: Perform full-image quality detection on the image to be recognized to determine whether it meets the image quality requirements: if so, directly perform biometric recognition; if not, determine the area in the image to be recognized where the brightness does not meet the preset value as the image area to be adjusted; Determine the image virtual partition to which the image area to be adjusted belongs as the image virtual partition that does not meet the quality requirements; And Based on the mapping relationship, find the color filter virtual partition on the variable color filter device corresponding to the image virtual partition that does not meet the quality requirements as the color filter partition to be adjusted.

5. The biometric recognition method according to any one of claims 2 or 3, characterized in that The step of correspondingly adjusting the voltage value of the color filter partition to be adjusted includes the steps: Adjust the duty cycle of the voltage applied to the physical partitions in the color filter partition to be adjusted through a pulse width modulation signal to change the light passing rate of the variable color filter device at the color filter partition to be adjusted.

6. A biometric recognition system, characterized in that, Including an image acquisition module and a processing module that are communicatively connected to each other; The image acquisition module includes an image sensor and a variable color filter device disposed in the light sensing path of the image sensor, wherein the image sensor is configured to acquire image information through the variable color filter device to obtain an image to be recognized; And the processing module includes: A virtual partitioning module communicatively connected to the image sensor and configured to perform virtual partitioning on the image to be recognized and the variable color filter device respectively, so as to construct a mapping relationship in which the image virtual partitioning of the image to be recognized corresponds one-to-one with the color filter virtual partitioning of the variable color filter device; A quality detection module communicatively connected to the image sensor and the virtual partitioning module, and configured to perform image quality detection on the image to be recognized, so as to determine, based on the mapping relationship, the color filter virtual partitioning corresponding to the image virtual partitioning in the image to be recognized that does not meet the quality requirements as the color filter partition to be adjusted of the variable color filter device; and A voltage adjustment module communicatively connected to the quality detection module and the variable color filter device, and configured to correspondingly adjust the voltage value of the color filter partition to be adjusted according to the image partition brightness, so as to change the light passing rate of the variable color filter device at the color filter partition to be adjusted, such that the image quality meets the requirements for biometric recognition; The voltage adjustment module is further configured to: Re-acquire the image to be recognized, and perform partition quality detection on the re-acquired image to be recognized, so as to determine whether the corresponding image virtual partitioning meets the image quality requirements: if so, perform biometric recognition; if not, repeatedly adjust the voltage value of the color filter partition to be adjusted until the image quality requirements are met.

7. The biometric recognition system according to claim 6, wherein The variable color filter device includes a pair of transparent electrode layers and at least one electrochromic layer disposed between the two transparent electrode layers.

8. The biometric recognition system according to claim 7, wherein The transparent electrode layer in the variable color filter device is arranged by a plurality of partition circuits that are independently controlled, so as to physically divide the variable color filter device into a physical partition matrix.

9. The biometric recognition system according to claim 8, wherein, Each of the color filter virtual partitions includes one or more physical partitions that are independently controlled by adjustable voltages.

10. An electronic device, characterized in that, Comprising: A device body; And A biometric recognition system according to any one of claims 6 to 9, the biometric recognition system being assembled on the device body.

Images