WO2023202410A1

WO2023202410A1 - Fingerprint unlocking method and apparatus, electronic device, and computer-readable storage medium

Info

Publication number: WO2023202410A1
Application number: PCT/CN2023/087397
Authority: WO
Inventors: 席聪聪; 李成; 耿越; 代翼; 丰亚洁; 李泽飞; 祁朝阳
Original assignee: 京东方科技集团股份有限公司; 北京京东方传感技术有限公司
Priority date: 2022-04-19
Filing date: 2023-04-10
Publication date: 2023-10-26
Also published as: CN114882540A; WO2023202410A9

Abstract

The present disclosure provides a fingerprint unlocking method and apparatus, an electronic device, and a computer-readable storage medium. The method comprises: performing exposure photographing on a fingerprint of a target subject to obtain a fingerprint image; and determining, on the basis of the fingerprint image, whether ambient light is strong light having a light intensity greater than or equal to a preset intensity value, if yes, selecting to perform fingerprint unlocking at a first security level, and if not, selecting to perform the fingerprint unlocking at a second security level, wherein the first security level is higher than the second security level.

Description

Fingerprint unlocking method and device, electronic equipment, computer-readable storage medium

Cross-references to related applications

This application requires the priority of the Chinese patent application submitted to the China Patent Office on April 19, 2022, with the application number 202210412611.1 and the application name "Fingerprint unlocking method and device, electronic equipment, computer-readable storage medium", and its entire content incorporated herein by reference.

Technical field

The present disclosure relates to the technical field of fingerprint identification, and in particular to a fingerprint unlocking method and device, electronic equipment, and computer-readable storage media.

Background technique

With the rapid development of the information industry, biometric technology has been increasingly widely used. In particular, a fingerprint is an innate and unique feature of the human body that can be distinguished from others. It consists of a series of valleys and ridges on the skin surface of the fingertips, and usually includes the bifurcation of the ridge, the end of the ridge, and the tent-like shape of the ridge. Details such as arch, left-hand, right-hand, spiral or double spiral. These details determine the unique characteristics of the fingerprint and can therefore be used for user identification. Based on this, fingerprint recognition technology has been widely used in many fields such as mobile terminals and smart homes to provide security for user information.

Contents of the invention

Embodiments of the present disclosure provide a fingerprint unlocking method and device, electronic equipment, and computer-readable storage media to improve the security of fingerprint unlocking in strong light environments.

Therefore, a fingerprint unlocking method provided by an embodiment of the present disclosure includes:

Expose and photograph the fingerprint of the target object to obtain a fingerprint image;

Based on the fingerprint image, it is determined whether the ambient light is strong light with a light intensity greater than or equal to the preset intensity value. If so, fingerprint unlocking is performed at the first security level. If not, fingerprint unlocking is performed at the second security level. , wherein the security level of the first security level is higher than the second security level. level of security.

In some embodiments, in the above fingerprint unlocking method provided by the embodiments of the present disclosure, determining whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value based on the fingerprint image specifically includes:

Based on the number of overexposure points and the gray scale value of the fingerprint image, it is determined whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value.

In some embodiments, in the above fingerprint unlocking method provided by the embodiments of the present disclosure, after obtaining the fingerprint image, and based on the number of overexposure points and grayscale value of the fingerprint image, it is determined whether the ambient light has a light intensity greater than or equal to Before the strong light of the preset intensity value, it also includes: counting the number of overexposure points of the fingerprint image.

In some embodiments, in the above fingerprint unlocking method provided by embodiments of the present disclosure, it is determined based on the number of overexposure points and grayscale values of the fingerprint image whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value, Specifically include:

Determine whether the number of overexposure points of the fingerprint image is greater than a preset value. If so, determine whether the ambient light is strong light. If not, determine whether the ambient light is greater than or equal to the preset intensity based on the grayscale value of the fingerprint image. Worth the glare.

In some embodiments, in the above fingerprint unlocking method provided by the embodiment of the present disclosure, after determining that the number of overexposure points of the fingerprint image is less than a preset value, and after determining whether the ambient light is based on the grayscale value of the fingerprint image Before the light intensity is greater than or equal to the preset intensity value, the method further includes: counting the grayscale values of the fingerprint image.

In some embodiments, in the above-mentioned fingerprint unlocking method provided by the embodiments of the present disclosure, determining whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value based on the grayscale value of the fingerprint image specifically includes:

Determine whether the grayscale value of the fingerprint image is greater than or equal to the preset grayscale value. If so, it is determined that the ambient light is strong light. If not, it is determined that the ambient light is not strong light.

In some embodiments, in the above fingerprint unlocking method provided by the embodiments of the present disclosure, after obtaining the fingerprint image and before determining whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value based on the fingerprint image, It also includes: performing noise reduction processing on the fingerprint image.

Based on the same inventive concept, embodiments of the present disclosure provide a fingerprint unlocking device, including:

The collection module is configured to expose and photograph the fingerprint of the target object to obtain a fingerprint image;

An unlocking module configured to determine whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value based on the fingerprint image. If so, select to perform fingerprint unlocking at the first security level. If not, select to perform fingerprint unlocking at the second security level. Fingerprint unlocking is performed at a security level, where the security level of the first security level is higher than the security level of the second security level.

Based on the same inventive concept, embodiments of the present disclosure provide an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the computer program. When executing the program, the above fingerprint unlocking method provided by the embodiment of the present disclosure is implemented.

Based on the same inventive concept, embodiments of the disclosure provide a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above fingerprint unlocking method provided by the embodiment of the disclosure is implemented.

The beneficial effects of this disclosure are as follows:

The fingerprint unlocking method and device, electronic equipment, and computer-readable storage medium provided by the embodiments of the present disclosure include exposing and photographing the fingerprint of the target object to obtain a fingerprint image; and determining whether the ambient light has a light intensity greater than or equal to a preset intensity based on the fingerprint image. value, if yes, then select fingerprint unlocking at the first security level; if not, select fingerprint unlocking at the second security level, where the security level of the first security level is higher than that of the second security level. Security Level. The present disclosure can determine strong light scenes and non-strong light scenes based on fingerprint images, and improve the security level of fingerprint unlocking in strong light scenes. Therefore, the security of fingerprint unlocking in strong light scenes can be effectively improved.

Description of the drawings

Figure 1 is a flow chart of a fingerprint unlocking method provided by an embodiment of the present disclosure;

Figure 2 is a fingerprint image in a non-strong light scene provided by an embodiment of the present disclosure;

Figure 3 is a fingerprint image in a strong light scene provided by an embodiment of the present disclosure;

Figure 4 shows the grayscale value of the fingerprint image in a strong light scene and the grayscale value in a non-strong light scene provided by an embodiment of the present disclosure. Comparison of grayscale values of fingerprint images;

Figure 5 is another flow chart of a fingerprint unlocking method provided by an embodiment of the present disclosure;

Figure 6 is another flow chart of a fingerprint unlocking method provided by an embodiment of the present disclosure;

Figure 7 is the fingerprint image after noise reduction processing of Figure 2;

Figure 8 is the fingerprint image after noise reduction processing of Figure 3;

Figure 9 is a schematic structural diagram of a fingerprint unlocking device provided by an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. It should be noted that the sizes and shapes of the figures in the drawings do not reflect true proportions and are only intended to illustrate the present disclosure. And the same or similar reference numbers throughout represent the same or similar elements or elements with the same or similar functions.

Unless otherwise defined, technical or scientific terms used herein shall have their ordinary meaning understood by a person of ordinary skill in the art to which this disclosure belongs. "First", "second" and similar words used in this disclosure and the claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprising" mean that the elements or things appearing before the word include the elements or things listed after the word and their equivalents, without excluding other elements or things. "Inside", "outside", "up", "down", etc. are only used to express relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

With the rapid development of smart terminals, smart terminals are not only required to have a beautiful appearance, but also need to give users a better visual experience. Major manufacturers have begun to increase the screen-to-body ratio on smart terminals, making full-screen displays a new competitive point for smart terminals. With the development of full-screen, the demand for improvement in performance and functions is also increasing day by day. The under-screen fingerprint recognition module can bring visual and user experience impact to a certain extent without affecting the high screen-to-body ratio. .

Currently, fingerprint recognition technologies mainly include optical, capacitive, ultrasonic, thermal, and pressure-sensitive types. However, capacitive sensors, semiconductor thermal materials, and pressure-sensitive materials have limited recognition distances and cannot collect sufficient signals through display modules. For fingerprint recognition, currently under-screen fingerprint recognition mainly uses optical and ultrasonic methods. However, ultrasonic fingerprint modules have complex structures and high costs. Optical fingerprint recognition has become the mainstream of current under-screen fingerprint recognition technology.

However, when the under-screen optical fingerprint recognition module is used in a scene with strong light (such as sunlight), the fingerprint recognition performance will be interfered by the strong light to a certain extent. For example, the applicant found that when using an under-screen optical fingerprint recognition module in related technologies for fingerprint recognition performance evaluation, the fingerprint recognition algorithm of the terminal device was set at the same security level under strong light and non-strong light scenarios. , Strong light scenes are more likely to have identification security problems than non-strong light scene tests.

In order to solve the above technical problems existing in related technologies, embodiments of the present disclosure provide a fingerprint unlocking method, as shown in Figure 1, which may include the following steps:

S101. Expose and photograph the fingerprint of the target object to obtain the fingerprint image;

S102. Determine whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value (for example, 10000 lux) based on the fingerprint image. If so, it can be determined that the fingerprint image was collected in a strong light scene, and step S103 can be performed. Perform fingerprint unlocking under a security level. If not, it can be determined that the fingerprint image was collected in a non-strong light scene, and step S104 can be performed to perform fingerprint unlocking under a second security level, where the security of the first security level A security level higher than the second security level.

In some embodiments, the higher the security level, the better the consistency between the collected fingerprint image and the pre-stored fingerprint image. For example, at the first security level, the collected fingerprint image has 90% of the same parts as the pre-stored fingerprint image. ;At the second security level, the collected fingerprint image has 70% of the same parts as the pre-stored fingerprint image.

In the above fingerprint unlocking method provided by the embodiments of the present disclosure, strong light scenes and non-strong light scenes can be determined based on fingerprint images, and the security level of fingerprint unlocking can be improved in strong light scenes. Therefore, fingerprint unlocking in strong light scenes can be effectively improved. Unlocked security.

Figure 2 shows a fingerprint image collected in a non-strong light scene, and Figure 3 shows a fingerprint image collected in a strong light scene. From the comparison, it can be seen that there are two areas between the fingerprint image in the non-strong light scene and the fingerprint image in the strong light scene. Other characteristic points: First, there is a difference in whether there is an overexposure area in the fingerprint images of the two scenes. There is no overexposure at _C1 in the lower left corner of the fingerprint image in the non-strong light scene shown in Figure 2, while in the strong light scene shown in Figure 3 There is an overexposure phenomenon at C ₂ in the lower left corner of the fingerprint image in a light scene. Specifically, the number of pixels with a grayscale value (WL) of 65535 in the fingerprint image is called the number of overexposure points. As shown in Figure 2 The number of overexposure points on the fingerprint image in the non-strong light scene is 0, while the number of overexposure points on the fingerprint image in the strong light scene shown in Figure 3 is 197, so the number of overexposure points on the fingerprint image can be used as the characteristic point The basis for judging strong light scenes; secondly, there is a difference in grayscale value between the fingerprint images in the two scenes. The grayscale value of the fingerprint image in the strong light scene is generally higher than that of the fingerprint image in the non-strong light scene. As shown in Figure 4, respectively, 900 The grayscale values of a fingerprint image in a non-strong light scene and 900 fingerprint images in a strong light scene. Area A represents the grayscale value of a fingerprint image in a strong light scene, and area B represents the grayscale value of a fingerprint image in a non-strong light scene. As can be seen in Figure 4, most of the grayscale value distributions of fingerprint images in strong light scenes and non-strong light scenes have obvious interval isolation, so the characteristic point of the grayscale value of fingerprint images can be used as a basis for judging strong light scenes.

Based on this, in the above-mentioned fingerprint unlocking method provided by the embodiment of the present disclosure, as shown in Figure 5, the above-mentioned step S102 determines whether the ambient light is strong light with a light intensity greater than or equal to the preset intensity value based on the fingerprint image. Specifically, step S102 ' is implemented in a step S102', based on the number of overexposure points and grayscale values of the fingerprint image, determine whether the ambient light is strong light with a light intensity greater than or equal to the preset intensity value.

In some embodiments, in the above fingerprint unlocking method provided by the embodiment of the present disclosure, as shown in Figure 6, after executing the above step S101 to obtain the fingerprint image, and after executing the above step S102', overexposure based on the fingerprint image Points and grayscale values, before determining whether the ambient light is strong light with a light intensity greater than or equal to the preset intensity value, step S201 can also be performed to count the number of overexposure points of the fingerprint image.

In some embodiments, in the above-mentioned fingerprint unlocking method provided by the embodiment of the present disclosure, as shown in Figure 6, the above-mentioned step S102' determines whether the ambient light is stronger than Bright light equal to the preset intensity value can be achieved by including the following steps:

S1021. Determine whether the number of exposure points of the fingerprint image is greater than a preset value (for example, 50). If so, perform step S1022 to determine whether the ambient light is strong light. If not, determine whether the ambient light is light based on the grayscale value of the fingerprint image. A bright light that is greater than or equal to the preset intensity value.

In some embodiments, after determining that the number of overexposed points of the fingerprint image is less than a preset value, and Before determining whether the ambient light is strong light with a light intensity greater than or equal to the preset intensity value according to the grayscale value of the fingerprint image, as shown in Figure 6, step S202 is also required to count the grayscale values of the fingerprint image. Accordingly, judging whether the ambient light is strong light with a light intensity greater than or equal to the preset intensity value based on the grayscale value of the fingerprint image may include the following steps:

S1023. Determine whether the grayscale value of the fingerprint image is greater than or equal to the preset grayscale value (for example, 4500). If so, perform step S1024 to determine that the ambient light is strong light. If not, perform step S1025 to determine that the ambient light is not strong. Light.

In some embodiments, in the above fingerprint unlocking method provided by the embodiment of the present disclosure, after performing step S101 to obtain a fingerprint image, and performing step S102 based on the fingerprint image, it is determined whether the ambient light has a light intensity greater than or equal to a predetermined value. Before setting the intensity value of the bright light, the fingerprint image can also be denoised (dedummy). For example, Figure 7 is a fingerprint image after noise reduction processing of the fingerprint image in the non-strong light scene shown in Figure 2, and Figure 8 is a fingerprint image after noise reduction processing of the fingerprint image in the strong light scene shown in Figure 3. As can be seen from Figures 7 and 8, the fingerprint image quality after noise reduction processing is better. Moreover, after testing, it can be found that the gray value of the fingerprint image after noise reduction processing shown in Figure 7 is 4159.041, and the gray value of the fingerprint image after noise reduction processing shown in Figure 8 is 6709.297.

Based on the same inventive concept, an embodiment of the present disclosure provides a fingerprint unlocking device, as shown in Figure 9, including:

The acquisition module 901 is configured to expose and photograph the fingerprint of the target object to obtain a fingerprint image;

The unlocking module 902 is configured to determine, based on the fingerprint image, whether the ambient light is strong light with a light intensity greater than or equal to the preset intensity value. If so, select to perform fingerprint unlocking at the first security level. If not, select to perform fingerprint unlocking at the second security level. Fingerprint unlocking is performed at different levels, where the security level of the first security level is higher than the security level of the second security level.

Since the principle of solving the problem of the fingerprint unlocking device is similar to the principle of the above-mentioned fingerprint unlocking method provided by the embodiment of the present disclosure, therefore, the implementation of the fingerprint unlocking device provided by the embodiment of the present disclosure can refer to the above-mentioned fingerprint unlocking method provided by the embodiment of the present disclosure. The implementation will not be repeated again.

Based on the same inventive concept, an embodiment of the present disclosure provides an electronic device, as shown in Figure 10 , including: a memory 1001, a processor 1002, and an electronic device stored in the memory 1001 and available in the processor 1002. When the processor 1002 executes the program 1003 running on the program 1003, the above fingerprint unlocking method provided by the embodiment of the present disclosure is implemented. Since the principle of solving the problem of the electronic device is similar to the principle of solving the problem of the above-mentioned fingerprint unlocking method, therefore, the implementation of the electronic device provided by the embodiment of the present disclosure can refer to the implementation of the above-mentioned fingerprint unlocking method provided by the embodiment of the present disclosure. No longer.

In some embodiments, the above-mentioned electronic devices provided by the embodiments of the present disclosure may be: mobile phones, tablet computers, televisions, monitors, notebook computers, digital photo frames, navigators, smart watches, fitness wristbands, personal digital assistants, and any other devices with A product or component that displays functionality. The electronic device includes but is not limited to: radio frequency unit, network module, audio output & input unit, sensor, display unit, user input unit, interface unit, memory, processor, power supply and other components. In addition, those skilled in the art can understand that the above structure does not constitute a limitation on the above-mentioned electronic device provided by the embodiment of the present disclosure. In other words, the above-mentioned electronic device provided by the embodiment of the present disclosure may include more or less of the above-mentioned ones. components, or combinations of certain components, or different arrangements of components.

In the present disclosure, the memory 1001 is used as a non-volatile computer-readable storage medium, which can be used to store non-volatile software programs, non-volatile computer executable programs and modules. The memory 1001 may include at least one type of storage medium, such as flash memory, hard disk, multimedia card, card-type memory, random access memory (Random Access Memory, RAM), static random access memory (Static Random Access Memory, SRAM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Magnetic Memory, Disk , CD, etc. Memory may be, but is not limited to, any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. The memory in the embodiment of the present disclosure may also be a circuit or any other device capable of realizing a storage function, used to store program instructions and/or data.

The processor 1002 may be a general-purpose processor, such as a central processing unit (CPU), a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or a field programmable gate array (Field Programmable Gate). Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware groups Software can realize or execute each method, step and logical block diagram disclosed in the embodiment of the present disclosure. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in conjunction with the embodiments of the present disclosure can be directly implemented as executed by a hardware processor, or executed using a combination of hardware and software modules in the processor.

The program 1003 on the memory 1001 and executable on the processor 1002 may include program code. When the program code is executed on an electronic device, the program code is used to cause the electronic device to perform various exemplary implementations according to the present disclosure described in this specification. For example, the electronic device may execute the fingerprint unlocking method described in the embodiments of the present disclosure. Alternatively, the program code may be specified using any known or future developed programming language, such as a high-level programming language such as Objective-C, C, C++, C#, Java, Python, Javascript, other scripting languages, etc., or low-level programming Language, such as machine language or assembler.

Based on the same inventive concept, embodiments of the present disclosure also provide a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, any one of the above fingerprint unlocking methods is implemented. Since the principle of the computer-readable storage medium to solve the problem is similar to the principle of the above-mentioned fingerprint unlocking method to solve the problem, the implementation of the computer-readable storage medium provided by the embodiment of the present disclosure can refer to the above-mentioned fingerprint unlocking method provided by the embodiment of the present disclosure. The implementation will not be repeated again.

Optionally, the above-mentioned computer-readable storage media provided by embodiments of the present disclosure may be non-transitory computer-readable media, such as any available media or data storage devices that a computer can access, including but not limited to magnetic storage (such as floppy disks, hard disks) , magnetic tape, magneto-optical disk (MO), etc.), optical memory (such as CD, DVD, BD, HVD, etc.), and semiconductor memory (such as ROM, EPROM, EEPROM, non-volatile memory (NANDFLASH), solid state drive (SSD) )wait.

It should be noted that embodiments of the present disclosure may be provided as methods, electronic devices, or computer-readable storage media. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment that combines software and hardware aspects. Furthermore, the present disclosure may employ computer-usable storage media (including, but not limited to, disk storage) having computer-usable program code embodied therein. computer program product implemented on a computer, CD-ROM, optical storage, etc.).

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, electronic devices, and computer-readable storage media according to the disclosure. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce a use A device for realizing the functions specified in one process or multiple processes of the flowchart and/or one block or multiple blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction means, the instructions The device implements the functions specified in a process or processes of the flowchart and/or a block or blocks of the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device. Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.

Although the present disclosure has described preferred embodiments, it should be understood that those skilled in the art can make various changes and modifications to the disclosed embodiments without departing from the spirit and scope of the disclosed embodiments. In this way, if these modifications and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and equivalent technologies, the present disclosure is also intended to include these modifications and variations.

Claims

A fingerprint unlocking method, which includes:

Expose and photograph the fingerprint of the target object to obtain a fingerprint image;

Based on the fingerprint image, it is determined whether the ambient light is strong light with a light intensity greater than or equal to the preset intensity value. If so, fingerprint unlocking is performed at the first security level. If not, fingerprint unlocking is performed at the second security level. , wherein the security level of the first security level is higher than the security level of the second security level.
The fingerprint unlocking method according to claim 1, wherein determining whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value based on the fingerprint image specifically includes:

Based on the number of overexposure points and the gray scale value of the fingerprint image, it is determined whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value.
The fingerprint unlocking method of claim 2, wherein after acquiring the fingerprint image, and based on the number of overexposure points and grayscale values of the fingerprint image, it is determined whether the ambient light is a light intensity greater than or equal to a preset intensity value. Before lighting, it also includes: counting the number of overexposure points of the fingerprint image.
The fingerprint unlocking method according to claim 3, wherein based on the number of overexposure points and gray scale value of the fingerprint image, determining whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value specifically includes:

Determine whether the number of overexposure points of the fingerprint image is greater than a preset value. If so, determine whether the ambient light is strong light. If not, determine whether the ambient light is greater than or equal to the preset intensity based on the grayscale value of the fingerprint image. Worth the glare.
The fingerprint unlocking method of claim 4, wherein after it is determined that the number of overexposure points of the fingerprint image is less than a preset value, and after determining whether the ambient light has a light intensity greater than or equal to a preset value based on the grayscale value of the fingerprint image. Before setting the intensity value of the strong light, it also includes: counting the grayscale values of the fingerprint image.
The fingerprint unlocking method according to claim 5, wherein determining whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value based on the grayscale value of the fingerprint image specifically includes:

Determine whether the grayscale value of the fingerprint image is greater than or equal to the preset grayscale value. If so, it is determined that the ambient light is strong light. If not, it is determined that the ambient light is not strong light.
The fingerprint unlocking method according to any one of claims 1 to 6, wherein after obtaining the fingerprint image and before determining whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value based on the fingerprint image, Including: performing noise reduction processing on the fingerprint image.
A fingerprint unlocking device, which includes:

The collection module is configured to expose and photograph the fingerprint of the target object to obtain a fingerprint image;

An unlocking module configured to determine whether the ambient light is strong light with a light intensity greater than or equal to a preset intensity value based on the fingerprint image. If so, select to perform fingerprint unlocking at the first security level. If not, select to perform fingerprint unlocking at the second security level. Fingerprint unlocking is performed at a security level, where the security level of the first security level is higher than the security level of the second security level.
An electronic device, which includes: a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, the implementation of claims 1 to 7 is achieved. The fingerprint unlocking method described in any one of the above.
A computer-readable storage medium on which a computer program is stored, wherein when the computer program is executed by a processor, the fingerprint unlocking method according to any one of claims 1 to 7 is implemented.