Backlight adjustment method and product of an optical fingerprint collector

Abstract

This application provides a backlight adjustment method and product for an optical fingerprint scanner, belonging to the technical field of optical fingerprint scanners. The method includes: acquiring a current fingerprint frame image, wherein the current fingerprint frame image includes a fingerprint region image and a non-fingerprint region image; segmenting the current fingerprint frame image to obtain the fingerprint region image; when the target parameters of the fingerprint region image do not meet preset conditions, adjusting the backlight voltage of the optical fingerprint scanner according to the target parameters of the fingerprint region image, and repeating the steps of acquiring the current fingerprint frame image and segmenting the current fingerprint frame image until a newly acquired fingerprint region image meets the preset conditions. The backlight adjustment method and product for an optical fingerprint scanner provided by this application can improve the problems of incomplete and unclear fingerprint images.

Description

Technical Field

[0001] This application relates to the field of optical fingerprint scanner technology, and more specifically, to a backlight adjustment method and product for an optical fingerprint scanner. Background Technology

[0002] An optical fingerprint sensor obtains fingerprint information by detecting the difference in light reflection between the fingerprint's valleys and ridges. Because the valleys and ridges of a fingerprint are at different distances from the sensor surface, they reflect different amounts of light. The fingerprint sensor then converts this light into an analog signal, the reader chip converts the analog signal into a digital signal, and finally, the processor integrates the data from multiple reader chips into a complete image for output.

[0003] Compared to capacitive fingerprint sensors, optical fingerprint sensors solve the problems of limited fingerprint coverage and low penetration depth. However, optical fingerprint sensors are prone to issues such as incomplete and unclear fingerprint images during use. Summary of the Invention

[0004] This application provides a backlight adjustment method and product for an optical fingerprint scanner, aiming to improve the problems of incomplete and unclear fingerprint images.

[0005] A first aspect of this application provides a backlight adjustment method for an optical fingerprint scanner, the adjustment method comprising:

[0006] Acquire the current fingerprint frame image, which includes a fingerprint region image and a non-fingerprint region image;

[0007] The current fingerprint frame image is segmented to obtain the fingerprint region image;

[0008] When the target parameters of the fingerprint region image do not meet the preset conditions, the backlight voltage of the optical fingerprint collector is adjusted according to the target parameters of the fingerprint region image, and the steps of acquiring the current fingerprint frame image and identifying and segmenting the current fingerprint frame image are repeated until the re-acquired fingerprint region image meets the preset conditions.

[0009] Optionally, before the step of when the target parameters of the fingerprint region image do not meet the preset conditions, the adjustment method further includes:

[0010] Determine whether the fingerprint region image is a closed shape;

[0011] When the fingerprint region image is a closed shape, the target parameters of the fingerprint region image are determined;

[0012] When the fingerprint region image is not a closed shape, the average gray level of the fingerprint region image is determined, and the backlight voltage is adjusted according to the average gray level. The steps of acquiring the current fingerprint frame image and identifying and segmenting the current fingerprint frame image are repeated until the re-acquired fingerprint region image is a closed shape.

[0013] Optionally, the adjustment method for determining whether the fingerprint region image is a closed shape includes:

[0014] Determine whether the area of ​​the fingerprint region image is larger than the target fingerprint area, and determine whether the shape of the fingerprint region image is abnormal;

[0015] When the area of ​​the fingerprint region image is greater than or equal to the area of ​​the target fingerprint and the shape of the fingerprint region image is not abnormal, the fingerprint region image is determined to be a closed shape;

[0016] If the area of ​​the fingerprint region image is smaller than the area of ​​the target fingerprint or the shape of the fingerprint region image is abnormal, the fingerprint region image is determined to be a non-closed shape.

[0017] Optionally, before the step of acquiring the current fingerprint frame image, the adjustment method further includes:

[0018] Get the current ambient light intensity value;

[0019] Based on the pre-set correspondence between ambient light intensity value and backlight voltage, the current backlight voltage corresponding to the current ambient light intensity value is determined.

[0020] Optionally, the step of determining the current backlight voltage corresponding to the current ambient light intensity value based on a pre-set correspondence between ambient light intensity values ​​and backlight voltage, the adjustment method includes:

[0021] When the ambient light intensity value is greater than the target threshold, the backlight voltage is adjusted to zero.

[0022] Optionally, the adjustment method for obtaining the current ambient light intensity value includes:

[0023] When the change in ambient light intensity exceeds the target change value, the ambient light intensity value is reacquired, and the backlight voltage is adjusted based on the reacquired ambient light intensity value.

[0024] Optionally, the target parameters include at least one of the following: average gray level, dynamic grayscale range, and fingerprint valley ridge signal quantity.

[0025] A second aspect of this application provides an optical fingerprint scanner, comprising:

[0026] An ambient light sensor, a fingerprint sensor, a display panel, and a controller, wherein the controller is connected to the ambient light sensor, the fingerprint sensor, and the backlight module of the display panel;

[0027] The ambient light sensor is used to acquire the current ambient light intensity value and send the current ambient light intensity value to the controller;

[0028] The fingerprint sensor is used to acquire the current fingerprint frame image and send the current fingerprint frame image to the controller;

[0029] The controller is used to adjust the voltage of the backlight module according to the current ambient light intensity value and the current fingerprint frame image.

[0030] A third aspect of this application provides an electronic device, the electronic device comprising:

[0031] processor;

[0032] Memory used to store the processor's executable instructions;

[0033] The processor is configured to execute the instructions to implement the method provided in the first aspect of the embodiments of this application.

[0034] A fourth aspect of this application provides a non-transitory computer-readable storage medium that, when instructions in the non-transitory computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform the method provided in the first aspect of this application.

[0035] Beneficial effects:

[0036] This application provides a backlight adjustment method for an optical fingerprint scanner. The method involves acquiring a current fingerprint frame image containing both fingerprint and non-fingerprint region images, and then segmenting the current fingerprint frame image to obtain a fingerprint region image. If the fingerprint region image does not meet preset conditions, the backlight voltage of the optical fingerprint scanner is adjusted according to the target parameters of the fingerprint region image. The steps of acquiring the current fingerprint frame image and segmenting the current fingerprint frame image are repeated until a new fingerprint region image meets the preset conditions. In this way, by continuously adjusting the backlight of the optical fingerprint scanner during the recognition process, the optical fingerprint scanner can acquire a complete and clear fingerprint image. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating the steps of a backlight adjustment method for an optical fingerprint scanner according to an embodiment of this application.

[0039] Figure 2 This is a schematic diagram of the structure of an optical fingerprint scanner according to an embodiment of this application;

[0040] Figure 3 This is a flowchart illustrating the operation of an optical fingerprint scanner according to an embodiment of this application. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Figure 1 A flowchart illustrating the steps of a backlight adjustment method for an optical fingerprint scanner is shown. (Refer to...) Figure 1 As shown in the figure, this application discloses a backlight adjustment method for an optical fingerprint scanner, the adjustment method comprising:

[0043] Step 101: Obtain the current fingerprint frame image, which includes a fingerprint region image and a non-fingerprint region image.

[0044] Specifically, when a user places their finger on the display panel of an optical fingerprint scanner, the built-in fingerprint sensor collects the user's fingerprint and generates an analog signal, which is then sent to the reading chip. The reading chip converts the analog signal into a digital signal. Optical fingerprint scanners typically include multiple fingerprint sensors and corresponding reading chips. Different fingerprint sensors collect fingerprints from different areas of the display panel, and the corresponding reading chips convert the signals collected by different fingerprint sensors. Finally, the processor inside the optical fingerprint scanner receives the digital signals sent by all the reading chips and integrates them into the current fingerprint frame image.

[0045] Furthermore, the current fingerprint frame image includes both fingerprint area and non-fingerprint area images. It is understandable that during fingerprint acquisition, the user's finger cannot completely cover the display panel; therefore, the final generated current fingerprint frame image includes portions containing fingerprints and portions without fingerprints. The portions containing fingerprints are the fingerprint area image, and the portions without fingerprints are the non-fingerprint area image.

[0046] Step 102: Perform recognition and segmentation on the current fingerprint frame image to obtain the fingerprint region image.

[0047] Specifically, after the processor acquires the current fingerprint frame image, the processor will perform recognition and segmentation on the current fingerprint frame image, that is, strip away the non-fingerprint region image contained in the current fingerprint frame image, so as to finally obtain the fingerprint region image.

[0048] The processor can determine the fingerprint region image and non-fingerprint region image in the current fingerprint frame image by reading the digital signals sent by the chip. It is understandable that the digital signals contained in the fingerprint region image differ from those contained in the non-fingerprint region image, and the processor can use these differences to separate the non-fingerprint region image, facilitating subsequent processing of the fingerprint region image.

[0049] Step 103: When the target parameters of the fingerprint region image do not meet the preset conditions, adjust the backlight voltage of the optical fingerprint collector according to the target parameters of the fingerprint region image, and repeat the steps of acquiring the current fingerprint frame image and identifying and segmenting the current fingerprint frame image until the re-acquired fingerprint region image meets the preset conditions.

[0050] Specifically, after acquiring the fingerprint region image, the processor will continue to acquire the target parameters of the fingerprint region image and compare these target parameters with preset conditions to determine whether the fingerprint region image meets the requirements.

[0051] For example, target parameters may include the average grayscale of the fingerprint region image, the dynamic grayscale range, and the fingerprint ridge signal quantity, etc. Preset conditions refer to the target parameters contained in a normal fingerprint image. These target parameters can be derived from the experience of those skilled in the art or from a limited number of experiments, and will not be elaborated upon further in this embodiment. Furthermore, preset conditions may also be the conditions required by the global high-level fingerprint standard: FBI FAP60 certification.

[0052] Meanwhile, when the target parameters of the fingerprint region image do not meet the preset conditions, the processor adjusts the backlight voltage of the optical fingerprint scanner according to the target parameters of the fingerprint region image. For example, when the average gray level of the fingerprint region image (average gray level mainly represents the contrast of the fingerprint region image) is low, the processor increases the backlight voltage of the optical fingerprint scanner accordingly, thereby increasing the backlight brightness and increasing the average gray level of the fingerprint region image; while when the average gray level of the fingerprint region image is high, the processor decreases the backlight voltage of the optical fingerprint scanner accordingly, thereby decreasing the backlight brightness and decreasing the average gray level of the fingerprint region image.

[0053] After the backlight voltage of the optical fingerprint scanner is adjusted, the current fingerprint frame image is reacquired and segmented until the reacquired fingerprint region image meets the preset conditions. In other words, the evaluation of the fingerprint region image and the adjustment of the backlight voltage are continuous during fingerprint acquisition, and multiple evaluations and adjustments result in a clearer and more complete final fingerprint image. Once the fingerprint region image meets the preset conditions, the processor outputs the fingerprint region image to an external processing module, where the fingerprint image algorithm is used to obtain the final fingerprint image.

[0054] By using the above adjustment method, the backlight of the optical fingerprint scanner can be continuously adjusted during the fingerprint acquisition process, so that the optical fingerprint scanner can acquire a complete and clear fingerprint image, thereby improving the acquisition effect of the optical fingerprint scanner.

[0055] Furthermore, prior to the step where the target parameters of the fingerprint region image do not meet the preset conditions, the adjustment method further includes:

[0056] Step 104: Determine whether the fingerprint region image is a closed shape;

[0057] When the fingerprint region image is a closed shape, the target parameters of the fingerprint region image are determined;

[0058] When the fingerprint region image is not a closed shape, the average gray level of the fingerprint region image is determined, and the backlight voltage is adjusted according to the average gray level. The steps of acquiring the current fingerprint frame image and identifying and segmenting the current fingerprint frame image are repeated until the re-acquired fingerprint region image is a closed shape.

[0059] Specifically, to ensure the integrity of the fingerprint image, before determining whether the fingerprint region image meets the preset conditions, it can first be determined whether the fingerprint region image is a closed shape. Furthermore, if the fingerprint region image is not a closed shape, the processor can adjust the backlight voltage based on the average grayscale of the fingerprint region image, and then re-acquire the fingerprint region image. For example, if the average grayscale of the fingerprint region image is too high when it is not a closed shape, the processor will reduce the backlight voltage, thereby increasing and decreasing the average grayscale of the fingerprint region image, so that the optical fingerprint scanner can acquire a more complete fingerprint region image.

[0060] Furthermore, the adjustment method for determining whether the fingerprint region image is a closed shape includes:

[0061] Step 1041: Determine whether the area of ​​the fingerprint region image is larger than the target fingerprint area, and determine whether the shape of the fingerprint region image is abnormal.

[0062] Specifically, a fingerprint region image must simultaneously meet the above conditions to be determined as a closed shape. That is, when the area of ​​the fingerprint region image is greater than or equal to the area of ​​the target fingerprint and the shape of the fingerprint region image is not abnormal, the fingerprint region image can be determined as a closed shape; when the area of ​​the fingerprint region image is less than the area of ​​the target fingerprint or the shape of the fingerprint region image is abnormal, the fingerprint region image is determined as not a closed shape.

[0063] The area of ​​the fingerprint region image refers to the area that constitutes the fingerprint region, while the target fingerprint area is the minimum area of ​​the fingerprint region image under normal circumstances. It can be understood that the fingerprint size of different users is different, but the effective fingerprint area in different fingerprints is the same. Therefore, the target fingerprint area can also be the effective fingerprint area.

[0064] The shape of a fingerprint region image refers to the shape of the parts that make up the fingerprint region. It is understood that the shape of a normal fingerprint region image should be approximately elliptical. Therefore, in practical applications, those skilled in the art can set a standard shape and then compare the shape of the acquired fingerprint region image with this standard shape to determine whether the shape of the fingerprint region image is abnormal.

[0065] By using the methods described above, the optical fingerprint scanner can capture fingerprints with better completeness and clarity each time, and also ensure better consistency in the collected fingerprints.

[0066] Furthermore, prior to the step of acquiring the current fingerprint frame image, the adjustment method further includes:

[0067] Step 105: Obtain the current ambient light intensity value;

[0068] Based on the pre-set correspondence between ambient light intensity and backlight voltage, the backlight voltage corresponding to the current ambient light intensity is determined.

[0069] Specifically, during the fingerprint acquisition process of an optical fingerprint scanner, since the fingerprint sensor converts the light flux reflected from the fingerprint valleys and ridges into analog signals, ambient light, in addition to the influence of the backlight of the optical fingerprint scanner itself, also affects fingerprint acquisition. For example, excessively strong ambient light can lead to a high average grayscale value in the acquired fingerprint image. Therefore, before fingerprint acquisition, the backlight intensity can be adjusted according to the ambient light intensity. The ambient light intensity value can be obtained through an ambient light sensor installed on the optical fingerprint scanner.

[0070] In this embodiment, the processor pre-sets a correspondence between ambient light intensity values ​​and backlight voltage. This can be understood as the processor pre-setting a fitting function between the ambient light intensity value and the backlight voltage. After obtaining the ambient light intensity value, the corresponding backlight voltage can be determined based on this fitting function. For example, after determining that the acquired ambient light intensity value is a certain value, the processor obtains the corresponding backlight voltage value based on the fitting function, and then adjusts the backlight voltage of the optical fingerprint scanner's backlight module to the corresponding backlight voltage value. This saves time for the overall fingerprint acquisition process.

[0071] Those skilled in the art can obtain a fitting function between ambient light intensity and backlight voltage by collecting fingerprint data covering multiple ethnicities and various situations (e.g., dry fingers, wet fingers, male and female fingers) under different ambient light intensities and different backlight voltages. Of course, those skilled in the art can also obtain this fitting function through other methods, which will not be elaborated upon in the embodiments of this application.

[0072] Furthermore, it should be noted that the backlight voltage is only adjusted using this fitting function each time fingerprint acquisition begins or when there is a sudden change in ambient light. During fingerprint acquisition, the backlight voltage is adjusted solely based on the evaluation of the fingerprint region image.

[0073] Further, in the step of determining the current backlight voltage corresponding to the current ambient light intensity value based on a pre-set correspondence between ambient light intensity values ​​and backlight voltage, the adjustment method includes:

[0074] Step 106: When the ambient light intensity value is greater than the target threshold, adjust the backlight voltage to zero.

[0075] Specifically, in practical applications, when the ambient light intensity is too high, the backlight has less effect on fingerprint collection. Therefore, the fingerprint collection effect can be improved by turning off the backlight of the optical fingerprint scanner.

[0076] The target threshold is the critical value of ambient light intensity. When the ambient light intensity is greater than this threshold, the overall brightness is relatively high, and the backlight can be turned off, i.e., the backlight voltage can be adjusted to zero. Conversely, when the ambient light intensity is less than or equal to this threshold, the overall brightness is relatively low, and therefore, both backlight and ambient light intensity need to be considered when collecting fingerprints. The size of the target threshold can be determined by a limited number of implementations by those skilled in the art. In this embodiment, the target threshold is 35k lux to 45k lux. Exemplarily, the target threshold may include 35k lux, 40k lux, 45k lux, etc.

[0077] Furthermore, in the step of obtaining the current ambient light intensity value, the adjustment method includes:

[0078] Step 107: When the ambient light change value is greater than the target change value, reacquire the ambient light intensity value and adjust the backlight voltage according to the reacquired ambient light intensity value.

[0079] Specifically, sudden changes in ambient light can affect fingerprint acquisition. For example, when an optical fingerprint scanner transitions from a bright scene to a darker one, if the backlight of the scanner was not turned on in the bright scene, the amount of light reflected from the fingerprint valleys and ridges will decrease in the darker scene, and the fingerprint sensor may not be able to fully acquire the fingerprint information.

[0080] In practical applications, the ambient light sensor can acquire ambient light intensity values ​​at fixed time intervals (e.g., 1 minute, 5 minutes, 10 minutes, etc.). The processor compares two consecutive acquired ambient light intensity values. If the change between the two values ​​exceeds a target change value, the ambient light intensity value is acquired again, and the backlight voltage is adjusted based on the reacquired value. It should be noted that the target change value can be determined based on the experience of those skilled in the art or through a limited number of experiments, and will not be elaborated upon in this embodiment.

[0081] By using the above adjustment method, when using an optical fingerprint scanner, the backlight can be adjusted first by the correspondence between the ambient light intensity value and the backlight voltage, so that the fingerprint image collected by the optical fingerprint scanner is more in line with expectations. At the same time, during the collection process, the backlight voltage is continuously adjusted according to the target parameters of the fingerprint area image, so that the final fingerprint image is clearer and more complete.

[0082] Based on the same inventive concept, referring to Figure 2As shown in the figure, this application embodiment also discloses an optical fingerprint collector, which includes an ambient light sensor, a fingerprint sensor, a display panel and a controller, wherein the controller is connected to the ambient light sensor, the fingerprint sensor and the backlight module of the display panel.

[0083] Specifically, the ambient light sensor is used to acquire the current ambient light intensity value and send the current ambient light intensity value to the controller. The controller can make preliminary adjustments to the backlight voltage of the backlight module based on the current ambient light intensity value.

[0084] The fingerprint sensor is used to acquire the current fingerprint frame image and send the current fingerprint frame image to the controller. The controller then adjusts the voltage of the backlight module according to the current fingerprint frame image based on the adjustment method described above in the embodiments of this application.

[0085] The workflow of an optical fingerprint scanner can be referenced. Figure 3 The flowchart shown below roughly describes the process:

[0086] After the optical fingerprint scanner is turned on, the backlight control chip provides a universal backlight voltage to make the backlight module emit light. Then, the ambient light sensor collects the current ambient light intensity value and transmits it to the controller. The controller first adjusts the backlight voltage according to the current ambient light intensity value.

[0087] The user then places their finger on the display panel, and the fingerprint sensor collects the user's fingerprint information to generate the current fingerprint frame image and sends it to the controller. The controller obtains the fingerprint region image based on the current fingerprint frame image and further adjusts the backlight voltage by evaluating the target parameters of the fingerprint region image.

[0088] After the target parameters of the fingerprint area image meet the preset conditions, the optical fingerprint scanner uploads the fingerprint image to the host computer. The host computer optimizes the fingerprint image using a fingerprint image algorithm and outputs the final fingerprint image. Then, the fingerprint sensor continues to collect the fingerprint information of the next user and repeats the above steps until the optical fingerprint scanner is turned off or powered off.

[0089] The optical fingerprint scanner provided in this application embodiment can adjust the backlight voltage by using the ambient light intensity value and the target parameters of the fingerprint area image, so that the final fingerprint image is clearer and more complete.

[0090] Based on the same inventive concept, embodiments of this application also provide an electronic device, which includes a processor and a memory for storing executable instructions of the processor.

[0091] Specifically, the processor is configured to execute the instructions to implement any of the backlight adjustment methods described above in the embodiments of this application.

[0092] Based on the same inventive concept, embodiments of this application also provide a non-transient computer-readable storage medium.

[0093] Specifically, when the instructions in the non-transient computer-readable storage medium are executed by the processor of the electronic device, the electronic device is able to perform any of the backlight adjustment methods described above in the embodiments of this application.

[0094] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0095] It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "includes a..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0096] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as a limitation of this application. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. A backlight adjustment method of an optical fingerprint acquirer, characterized by, The adjustment method includes: Acquire the current fingerprint frame image, which includes a fingerprint region image and a non-fingerprint region image; The current fingerprint frame image is segmented to obtain the fingerprint region image; When the target parameters of the fingerprint region image do not meet the preset conditions, the backlight voltage of the optical fingerprint collector is adjusted according to the target parameters of the fingerprint region image, and the steps of acquiring the current fingerprint frame image and identifying and segmenting the current fingerprint frame image are repeated until the re-acquired fingerprint region image meets the preset conditions; wherein, the target parameters include at least the average gray level, dynamic gray level range and fingerprint valley ridge signal quantity of the fingerprint region image; Before the step of addressing the issue of the target parameters in the fingerprint region image not meeting preset conditions, the adjustment method further includes: Determine whether the fingerprint region image is a closed shape; When the fingerprint region image is a closed shape, the target parameters of the fingerprint region image are determined; When the fingerprint region image is not a closed shape, the average gray level of the fingerprint region image is determined, and the backlight voltage is adjusted according to the average gray level. The steps of acquiring the current fingerprint frame image and identifying and segmenting the current fingerprint frame image are repeated until the re-acquired fingerprint region image is a closed shape. The step of determining whether the fingerprint region image is a closed shape, the adjustment method includes: Determine whether the area of ​​the fingerprint region image is larger than the target fingerprint area, and determine whether the shape of the fingerprint region image is abnormal; When the area of ​​the fingerprint region image is greater than or equal to the area of ​​the target fingerprint and the shape of the fingerprint region image is not abnormal, the fingerprint region image is determined to be a closed shape; If the area of ​​the fingerprint region image is smaller than the area of ​​the target fingerprint or the shape of the fingerprint region image is abnormal, the fingerprint region image is determined to be a non-closed shape.

2. The backlight adjustment method of an optical fingerprint acquirer according to claim 1, characterized in that, Prior to the step of acquiring the current fingerprint frame image, the adjustment method further includes: Get the current ambient light intensity value; Based on the pre-set correspondence between ambient light intensity value and backlight voltage, the current backlight voltage corresponding to the current ambient light intensity value is determined.

3. The backlight adjustment method of an optical fingerprint acquirer according to claim 2, wherein, The step of determining the current backlight voltage corresponding to the current ambient light intensity value based on a pre-set correspondence between ambient light intensity value and backlight voltage, the adjustment method includes: When the ambient light intensity value is greater than the target threshold, the backlight voltage is adjusted to zero.

4. The backlight adjustment method of an optical fingerprint acquirer according to claim 2, wherein The step of obtaining the current ambient light intensity value, the adjustment method includes: When the change in ambient light intensity exceeds the target change value, the ambient light intensity value is reacquired, and the backlight voltage is adjusted based on the reacquired ambient light intensity value.

5. An optical fingerprint acquisitor characterized by comprising: The optical fingerprint scanner is used to perform the method according to any one of claims 1 to 4, the optical fingerprint scanner comprising: An ambient light sensor, a fingerprint sensor, a display panel, and a controller, wherein the controller is connected to the ambient light sensor, the fingerprint sensor, and the backlight module of the display panel; The ambient light sensor is used to acquire the current ambient light intensity value and send the current ambient light intensity value to the controller; The fingerprint sensor is used to acquire the current fingerprint frame image and send the current fingerprint frame image to the controller; The controller is used to adjust the voltage of the backlight module according to the current ambient light intensity value and the current fingerprint frame image; The collector also includes: Determine whether the fingerprint region image is a closed shape; When the fingerprint region image is a closed shape, target parameters of the fingerprint region image are determined; wherein, the target parameters include at least the average gray level, dynamic gray level range, and fingerprint valley ridge signal quantity of the fingerprint region image; When the fingerprint region image is not a closed shape, the average gray level of the fingerprint region image is determined, and the backlight voltage is adjusted according to the average gray level. The steps of acquiring the current fingerprint frame image and identifying and segmenting the current fingerprint frame image are repeated until the re-acquired fingerprint region image is a closed shape. Determine whether the area of ​​the fingerprint region image is larger than the target fingerprint area, and determine whether the shape of the fingerprint region image is abnormal; When the area of ​​the fingerprint region image is greater than or equal to the area of ​​the target fingerprint and the shape of the fingerprint region image is not abnormal, the fingerprint region image is determined to be a closed shape; If the area of ​​the fingerprint region image is smaller than the area of ​​the target fingerprint or the shape of the fingerprint region image is abnormal, the fingerprint region image is determined to be a non-closed shape.

6. An electronic device, comprising: The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the method as described in any one of claims 1 to 4.

7. A non-transitory computer-readable storage medium, comprising: When the instructions in the non-transient computer-readable storage medium are executed by the processor of the electronic device, the electronic device is able to perform the method as described in any one of claims 1 to 4.

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