WO2023225815A1

WO2023225815A1 - Fingerprint recognition method and apparatus, and terminal device

Info

Publication number: WO2023225815A1
Application number: PCT/CN2022/094528
Authority: WO
Inventors: 阳平; 曾杰民
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2023-11-30
Also published as: CN115136210A; CN115136210B

Abstract

Embodiments of the present application provide a fingerprint recognition method and apparatus, and a terminal device. The fingerprint recognition method comprises: when a touch operation for a fingerprint recognition area on a display screen is monitored, collecting a fingerprint pre-collection graph, and determining whether to enter a recognition graph collection process according to the fingerprint pre-collection graph and a preset pre-collection end condition, wherein the pre-collection end condition comprises a pre-collection target brightness value; and once the recognition graph collection process is entered, collecting a fingerprint recognition graph, wherein the fingerprint recognition graph is used for unlocking the display screen. According to the technical solution, the quality of the fingerprint recognition graph can be ensured, thus increasing the unlocking success rate of fingerprint recognition.

Description

Fingerprint identification method, device and terminal equipment

Technical field

The present application relates to the field of image processing technology, and in particular to a fingerprint identification method, device and terminal equipment.

Background technique

With the rise and application of full-screen terminal devices, more and more smart terminal devices use under-screen optical fingerprint recognition to unlock the screen to prevent the fingerprint collection window from affecting the appearance of the terminal device.

In practical applications, the principle of under-screen optical fingerprint recognition is as follows: the user's finger presses the organic light-emitting diode (OLED) screen, causing the light emitted by the OLED screen to illuminate the finger fingerprint area, illuminating the fingerprint area. The reflected light returns to the sensor under the screen through the gaps in the pixels of the OLED screen, thereby collecting a fingerprint image. The fingerprint image is compared and analyzed with the fingerprint images already stored in the database, and the screen is unlocked after matching recognition is determined.

It can be seen that under-screen optical fingerprint recognition has requirements for the brightness of the fingerprint spot. When the brightness of the spot does not meet the requirements, it will affect the success rate of fingerprint recognition, resulting in a low success rate of screen unlocking.

Contents of the invention

Embodiments of the present application provide a fingerprint identification method, device and terminal equipment to improve the success rate of fingerprint identification.

The first aspect of this application provides a fingerprint identification method, including:

When a touch operation targeting the fingerprint recognition area on the display screen is detected, a fingerprint pre-acquisition map is collected;

Determine whether to enter the identification map collection process according to the fingerprint pre-collection map and the preset pre-collection end condition, where the pre-collection end condition includes the pre-collection target brightness value;

After entering the identification pattern collection process, a fingerprint identification pattern is collected, and the fingerprint identification pattern is used for screen unlocking of the display screen.

In a possible implementation of the first aspect, determining whether to enter the identification map collection process based on the fingerprint pre-collection map and preset pre-collection end conditions includes:

If the brightness value of the pre-acquisition target is equal to 0, it is determined to enter the identification map collection process;

If the pre-collection target brightness value is greater than 0, it is determined whether to enter the identification map collection process based on the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value.

Optionally, determining whether to enter the identification map collection process based on the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value includes:

According to the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value, it is determined whether the pre-collection brightness value of the fingerprint pre-collection map meets the preset brightness requirement; if the pre-collection brightness value of the fingerprint pre-collection map is If the brightness value meets the preset brightness requirements, it is determined to enter the identification map collection process;

If the pre-collection brightness value of the fingerprint pre-collection map does not meet the preset brightness requirement, the total number of frames of the fingerprint pre-collection map that has been collected is determined. According to the total number of frames of the fingerprint pre-collection map and the maximum number of pre-collection map frames, Determine whether to enter the identification map collection process, and the pre-collection end condition also includes the maximum number of pre-collection map frames.

Optionally, the preset brightness requirement is characterized by the following formula:

(A2-A1)/A2＜H2

Wherein, A2 is the pre-collection target brightness value, A1 is the pre-collection brightness value of the fingerprint pre-collection image, and H2 is a preset threshold.

Optional, the value of H2 is between 0 and 1, for example, H2=0.5, that is to say, when the value of (A2-A1)/A2 is less than 0.5, it is considered that the brightness value of the current fingerprint spot meets the requirement of highlighting. Requirements, you can enter the identification map collection process to collect fingerprint identification maps. Optional, H2=0.2, at this time, the brightness requirement of the current fingerprint spot is higher, which can further improve the performance of subsequent fingerprint recognition.

In a possible implementation of the first aspect, determining whether to enter the identification map collection process based on the total number of frames of the fingerprint pre-collection map and the maximum number of frames of the pre-collection map includes:

If the total number of frames of the fingerprint pre-collection images is greater than or equal to the maximum number of frames of the pre-acquisition images, it is determined to enter the identification map collection process;

If the total number of frames of fingerprint pre-collection images is less than the maximum number of frames of pre-acquisition images, continue to collect one frame of fingerprint pre-acquisition images.

In a possible implementation of the first aspect, the method further includes:

Based on the fingerprint recognition map and preset fingerprint information, perform screen unlocking of the display screen;

Determine whether the target value update condition is met based on whether the display screen is successfully unlocked, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image;

When the target value update condition is met, update the pre-collection target brightness value; or

When the target value update conditions are not met, the process ends.

Optionally, the target value update conditions include: the display screen is unlocked successfully, the touch area is greater than a preset area threshold and the fingerprint recognition image brightness value is less than a set brightness threshold.

Optionally, updating the pre-collection target brightness value includes: updating the pre-collection target brightness value according to the pre-collection brightness value of the fingerprint pre-collection map.

Optionally, updating the pre-collection target brightness value according to the pre-collection brightness value of the fingerprint pre-collection map includes:

If the pre-collection target brightness value is equal to 0, then assign the pre-collection brightness value of the fingerprint pre-collection map to the pre-collection target brightness value;

If the pre-collection target brightness value is greater than 0, then the average brightness value of the pre-collection brightness value of the fingerprint pre-collection image and the pre-collection target brightness value is assigned to the pre-collection target brightness value.

Optionally, when the display screen is unlocked successfully, the touch area is greater than the preset area threshold and the brightness value of the fingerprint identification image is less than the set brightness threshold, the number of interval updates of the pre-collection target brightness value is increased by 1. .

Optionally, the method also includes:

After the pre-collection target brightness value is updated, the current interval update number of the pre-collection target brightness value is set to 0.

In a possible design of the first aspect, if the pre-collection target brightness value is greater than 0, then the pre-collection brightness value of the fingerprint pre-collection map and the average brightness value of the pre-collection target brightness value are assigned Give the pre-acquisition target brightness value, including:

If the current interval update number of the pre-sampling target brightness value is greater than the preset interval update times threshold, then the pre-sampling brightness value of the fingerprint pre-sampling map and the average brightness value of the pre-sampling target brightness value are assigned to the pre-sampling target brightness value. The pre-acquisition target brightness value is specified; or

If the current interval update times of the pre-collection target brightness value are less than or equal to the preset interval update times threshold, then continue to determine based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition map. Whether the target value update conditions are met.

In a possible design of the first aspect, the fingerprint pre-collection map is smaller than the fingerprint identification map, and the exposure time of the fingerprint pre-collection map is shorter than the exposure time of the fingerprint identification map.

In a possible design of the first aspect, the method further includes: when a touch operation targeting the fingerprint recognition area on the display screen is detected,

If the display screen is in a bright screen state, directly enter the identification map collection process;

If the display screen is in a screen-off state, the fingerprint pre-collection image is collected.

In a possible design of the first aspect, before determining whether the target value update condition is met based on whether the display screen is successfully unlocked, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image, the method further includes :

If the display screen is turned off and the identification map collection process is entered, it is determined whether the target value update condition is met based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition map; or

If the identification map collection process is entered from the display screen-on state, the process ends;

Wherein, the display screen on state or the display screen off state is the state of the display screen when a touch operation on the fingerprint recognition area on the display screen is detected.

A second aspect of this application provides a fingerprint identification device, including:

A collection module used to collect fingerprint pre-collection images when a touch operation targeting the fingerprint recognition area on the display screen is detected;

A processing module configured to determine whether to enter the identification map collection process based on the fingerprint pre-collection map and preset pre-collection end conditions, where the pre-collection end conditions include the pre-collection target brightness value;

The collection module is also configured to collect a fingerprint identification pattern after entering the identification pattern collection process, and the fingerprint identification pattern is used to unlock the screen of the display screen.

In a possible implementation of the second aspect, the processing module is specifically used to:

Optional, the processing module is specifically used for:

Determine whether the pre-collection brightness value of the fingerprint pre-collection map meets the preset brightness requirement according to the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value;

If the pre-collection brightness value of the fingerprint pre-collection map meets the preset brightness requirements, it is determined to enter the identification map collection process;

(A2-A1)/A2＜H2

In a possible implementation of the second aspect, the processing module is also used to:

When the target value update conditions are not met, the process ends.

Optionally, the processing module is specifically configured to update the pre-collection target brightness value according to the pre-collection brightness value of the fingerprint pre-collection map.

Optional, the processing module is specifically used for:

If the pre-collection target brightness value is equal to 0, then the pre-collection brightness value of the pattern pre-collection image is assigned to the pre-collection target brightness value;

Optionally, the processing module is also configured to set the current interval update number of the pre-collection target brightness value to 0 after the pre-collection target brightness value is updated.

Optional, the processing module is specifically used for:

In a possible implementation of the second aspect, the fingerprint pre-collection map is smaller than the fingerprint identification map, and the exposure time of the fingerprint pre-collection map is shorter than the exposure time of the fingerprint identification map.

In a possible implementation of the second aspect, the processing module is also configured to detect a touch operation on the fingerprint recognition area on the display screen,

In a possible implementation of the second aspect, before determining whether the target value update condition is met based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image, the processing module Also used for:

The third aspect of this application provides a terminal device, including:

A display screen, a touch control module, and a fingerprint recognition device provided below the display screen;

The touch control module is used to monitor touch operations above the display screen;

The fingerprint identification device is the fingerprint identification device described in the second aspect.

The fingerprint identification method, device and terminal equipment provided by this application first collect at least one frame of fingerprint pre-collection image before officially collecting the fingerprint identification image, and use the preset pre-collection end conditions, such as the brightness value of the pre-collection target to judge the fingerprint pre-collection. The brightness of the image refers to whether the brightness of the fingerprint spot reaches the target brightness. After determining that the brightness of the fingerprint spot reaches the target brightness, the fingerprint recognition image is triggered to be collected, that is, the recognition image collection process is entered. This can ensure the quality of the fingerprint recognition image and improve the efficiency of fingerprint recognition. Unlock success rate.

Description of the drawings

Figure 1 is a front view of a terminal device provided by an embodiment of the present application;

Figure 2 is a schematic cross-sectional view of the terminal equipment shown in Figure 1 along the tangent line AA';

Figure 3 is a schematic flow chart of Embodiment 1 of the fingerprint identification method provided by the embodiment of the present application;

Figure 4 is a schematic diagram of the size relationship between the fingerprint pre-collection map and the fingerprint identification map;

Figure 5 is a schematic flow chart of Embodiment 2 of the fingerprint identification method provided by the embodiment of this application;

Figure 6 is a schematic flow chart of Embodiment 3 of the fingerprint identification method provided by the embodiment of the present application;

Figure 7 is a schematic flow chart of Embodiment 4 of the fingerprint identification method provided by the embodiment of the present application;

Figure 8 is a schematic flow chart of Embodiment 5 of the fingerprint identification method provided by the embodiment of the present application;

Figure 9 is a schematic diagram showing the brightness of the fingerprint pre-collection image and/or the fingerprint identification image changing with time;

Figure 10 is a schematic structural diagram of a fingerprint identification device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

With the development of electronic technology and the gradual increase in users' attention to information security, security verification mechanisms with biometric identifiers are increasingly used in terminal devices. Fingerprint recognition is one of the more effective and commonly used ones. For terminal devices with displays, users expect a high screen-to-body ratio, and under-screen optical fingerprint recognition solutions can meet both information security and high screen-to-body ratio requirements.

In the current process of using optical principles for fingerprint recognition, since the under-screen optical fingerprint has requirements for the brightness of the fingerprint spot, when the brightness of the fingerprint spot is unstable or not bright enough, it will affect the success rate of fingerprint recognition and unlocking, thus affecting the user's use of fingerprints to scan the screen. Unlock the experience.

In view of the above technical problems, the conception process of the technical solution of this application is as follows: in the fingerprint recognition scenario, by adding a pre-map process before the identification map collection process, specifically, by presetting a variable pre-collection process in the pre-map process. Collect the target brightness value to determine that the fingerprint pre-collection map collected during the pre-collection process meets the brightness requirements. Only when the brightness meets the requirements will the fingerprint identification map collection process be entered, thereby ensuring the quality of the fingerprint identification map. Furthermore, in order to more accurately control the timing of entering the fingerprint identification process from the pre-acquisition process, the update process of the pre-acquisition target brightness value can also be added after the fingerprint identification process, thereby further improving the pre-acquisition process used in the pre-acquisition process. The accuracy of the target brightness value.

Based on the above technical conception process, embodiments of the present application provide a fingerprint identification method. Before officially collecting fingerprint identification images, at least one frame of fingerprint pre-acquisition images is first collected, and the preset pre-acquisition end conditions are used, such as the pre-acquisition target brightness value. Determine the brightness of the fingerprint pre-acquisition image, that is, whether the brightness of the fingerprint spot reaches the target brightness. After determining that the brightness of the fingerprint spot reaches the target brightness, trigger the acquisition of the fingerprint identification image, that is, enter the identification image collection process, thus ensuring the quality of the fingerprint identification image, and thus enabling Improve the unlocking success rate of fingerprint recognition.

The fingerprint identification method provided by the embodiment of the present application can mainly be applied to the field of optical fingerprint identification. Furthermore, it can be specifically applied to various terminal devices that use optical fingerprint recognition, such as mobile computing devices such as smartphones, laptops, tablets, and game devices, as well as electronic databases, cars, and bank automated teller machines (automated teller machines, ATMs). and other terminal devices that require fingerprint recognition.

Figure 1 is a front view of a terminal device provided by an embodiment of the present application. As shown in Figure 1, the front of a commonly used terminal device 10 (such as a mobile phone) includes a display screen 100, in which a fingerprint recognition area 101 for fingerprint recognition is provided. Fingerprint recognition is performed when the user's finger 102 touches the fingerprint recognition area 101. process.

It can be understood that in the implementation of the fingerprint identification solution provided by this application, the display screen 100 may be a touch screen, that is, the display screen 100 has a touch control module (not shown) at least in part of the fingerprint identification area 101 or in the entire area of the display screen. (out), the touch control module is used to monitor touch operations on the display screen 100. Specifically, it can be used to determine whether the user's finger 102 touches the fingerprint recognition area 101. The touch control function of the touch control module can be configured by a capacitor. Touch control or resistive touch control or pressure-sensitive touch control implementation, including but not limited to this.

Figure 2 is a schematic cross-sectional view of the terminal equipment shown in Figure 1 along the tangent line AA'. Referring to FIG. 2 , a fingerprint identification device 103 is deployed inside the display screen 100 and at a corresponding position of the fingerprint identification area 101 . The fingerprint identification device 103 is used to collect fingerprints when the touch control module determines that the user's finger 102 touches the fingerprint identification area 101 . Pre-collection map and/or fingerprint recognition map, the fingerprint recognition map is used for fingerprint recognition to complete fingerprint unlocking or payment. Optionally, the fingerprint identification device 103 may be an optical fingerprint identification device. When the user's finger 102 touches the fingerprint recognition area 101 and the touch control module detects the touch of the finger, the excitation light source illuminates the user's finger 102 and is reflected by the user's finger 102 to form a fingerprint light signal carrying the fingerprint information of the finger, and then the fingerprint The optical signal passes through the display screen 100, is detected by the fingerprint identification device 103, and is then used for fingerprint identification. The excitation light source may be the light-emitting unit of the display screen 100 or an additional light source. Further, in the embodiment of the present application, the terminal device 10 may also include a signal processing module (not shown) inside. The signal processing module is used to perform fingerprint recognition based on the collected fingerprint pre-collection map and/or fingerprint identification map.

It can be understood that the fingerprint identification scheme proposed in this application uses a short exposure time to quickly collect the fingerprint pre-collection image of the fingerprint identification area before officially collecting the fingerprint identification image, and further analyzes the brightness of the fingerprint pre-collection image to determine Whether the brightness of the fingerprint pre-collection image meets the requirements.

It should be noted that FIG. 1 and FIG. 2 are only schematic structural diagrams provided by the embodiment of the present application. The embodiment of the present application does not limit the components shown in FIG. The position relationship is limited, which can be set according to actual scenarios and needs, and will not be described here.

In the embodiment of this application, "multiple" refers to two or more. "And/or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the related objects are in an "or" relationship.

Below, the technical solution of the present application will be described in detail through specific embodiments in conjunction with the schematic diagram shown in FIG. 1 or FIG. 2 . It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

Figure 3 is a schematic flow chart of Embodiment 1 of the fingerprint identification method provided by the embodiment of the present application. As shown in Figure 3, the fingerprint identification method specifically includes the following steps:

S301. When a touch operation on the fingerprint recognition area on the display screen is detected, collect a fingerprint pre-collection map.

In this step, when the terminal device is running, the user's identity can be verified through fingerprint recognition in scenarios such as unlocking, payment, and logging in to certain applications. In these cases, the user fingerprint collection process is performed first.

For example, when entering a fingerprint recognition scenario such as mobile payment, the terminal device prompts the user to perform fingerprint recognition. The prompt method may be to light up part of the fingerprint recognition area on the display screen, or to provide a text reminder on the display screen, etc. , including but not limited to the above prompt methods.

For example, during the process of user fingerprint collection, the user's touch operation is detected. When the user's finger touches the fingerprint recognition area, the touch control module triggers the start of fingerprint recognition when it detects that the finger touches the surface of the fingerprint recognition area. , that is, execute the pre-collection map collection process and collect the fingerprint pre-collection map.

Optionally, in the embodiment of the present disclosure, when the pre-collection image collection process is executed, the light-emitting unit of the fingerprint recognition area on the display screen emits light, so that the fingerprint pre-collection map can be collected based on the preset fingerprint pre-collection conditions, that is, the fingerprint pre-collection map can be collected based on the preset fingerprint pre-collection conditions. Constraints on fingerprint pre-collection, such as pre-collection exposure time, image size of the pre-collection map, etc.

It is understandable that for the under-screen optical fingerprint recognition function, at least one temporary image can be pre-collected before collecting the formal image for fingerprint recognition. In the embodiment of the present application, the formal image used for fingerprint identification may be called a fingerprint identification picture or a formal picture, and at least one temporary picture for pre-collection may be called a pre-collection picture or a fingerprint pre-collection picture. This embodiment does not apply to The specific name of the image is qualified.

In the embodiment of the present application, the pre-collection brightness value of the fingerprint pre-collection map can be used to reflect the brightness of the fingerprint spot on the display screen, which is the brightness of the fingerprint recognition area on the display screen.

In a possible implementation of the present disclosure, in order to increase the sampling rate of the fingerprint pre-collection map and reduce the processing time of the fingerprint pre-collection map, the fingerprint pre-collection conditions can be preset. Therefore, when a touch operation on the fingerprint identification area is detected, the fingerprint pre-collection map collection process can be executed based on the fingerprint pre-collection condition.

S302. Determine whether to enter the identification map collection process according to the fingerprint pre-collection map and the preset pre-collection end condition.

Wherein, the pre-collection end condition includes the pre-collection target brightness value.

In the embodiment of the present application, the pre-mining end condition can be preset, that is, the timing to exit the pre-mining map collection process and the timing to enter the identification map collection process can be determined based on the pre-mining end condition.

Optionally, in a possible implementation, the pre-collection end condition may include a pre-collection target brightness value, which is a preset variable that can be used to measure the brightness of the fingerprint pre-collection map. Normally, when the terminal device is restarted or powered on, the pre-acquisition target brightness value is equal to 0.

For example, if the brightness value of the pre-collection target is equal to 0, then it is determined to exit the pre-collection map collection process and enter the identification map collection process; if the brightness value of the pre-collection target is not equal to 0 (greater than 0), then according to the pre-collection target The brightness value and the pre-collection brightness value of the fingerprint pre-collection map determine whether to exit the pre-collection map collection process and enter the identification map collection process.

It can be understood that in practical applications, the embodiment of the present application can collect at least one frame of fingerprint pre-sampling image for judgment. For example, when the pre-sampling target brightness value is equal to 0 or the brightness of the collected one-frame fingerprint pre-sampling image meets the brightness requirements, Then only one frame of fingerprint pre-collection map is collected. Therefore, the solution of increasing the pre-collection map collection process in this embodiment is less time-consuming and has less impact on the identification map collection process.

S303. After entering the identification map collection process, collect a fingerprint identification map, which is used to unlock the display screen.

Optionally, after entering the identification image collection process, the fingerprint sensor installed under the display screen can collect the fingerprint identification image, and compare the fingerprint identification image with the pre-stored fingerprint image to determine whether the fingerprint identification is successful, and then determine whether the fingerprint identification image is successful. Whether the screen unlocking of the display is successful.

It can be understood that in order to reduce the processing time of the fingerprint pre-collection map and increase the sampling rate of the fingerprint pre-collection map, in this embodiment, the fingerprint pre-collection map is smaller than the fingerprint identification map, and the exposure time of the fingerprint pre-collection map is shorter than the exposure time of the fingerprint identification map. time.

For example, FIG. 4 is a schematic diagram of the size relationship between the fingerprint pre-collection map and the fingerprint identification map. As shown in Figure 4, the size of the fingerprint pre-collection image is X1*Y1, and the size of the fingerprint identification image is X2*Y2. The size relationship between the two is shown in Figure 4. That is, the size of the fingerprint pre-collection image is smaller than the size of the fingerprint recognition image. That is, X1<X2, Y1<Y2. Among them, the size of the fingerprint identification map can be the size of the image converted into the light signal collected by the sensing area of the fingerprint sensor, and the size of the fingerprint pre-collection map can be the image formed by converting the light signal collected by part of the sensing area of the fingerprint sensor. size of. The fingerprint pre-acquisition image is used to determine whether the fingerprint spot meets the highlight requirements, that is, the brightness requirements required for fingerprint recognition. It is not directly used for fingerprint recognition, so a complete fingerprint image is not required. This setting can improve the ability to determine the brightness of the fingerprint spot. efficiency and improve user experience.

In this embodiment, the center of the fingerprint pre-acquisition image is calculated during the mass production test of the terminal device. It is the optical center of the fingerprint spot, that is, the position with the maximum brightness. It is not the center of the fingerprint recognition image.

In practical applications, the smaller the size of the fingerprint pre-capture image, the better. However, the size of the fingerprint pre-capture image is too small to ensure that the optical center of the fingerprint spot is captured. The shorter the pre-capture exposure time, the smaller the impact on the overall unlocking time. However, the pre-collection exposure time is too short to ensure the quality of the collected fingerprint pre-collection map. Therefore, the pre-collection exposure time and pre-collection map size of the fingerprint pre-collection map need to be set according to actual needs, which will not be described here.

In the embodiment of the present application, when a touch operation on the fingerprint identification area on the display screen is detected, a fingerprint pre-collection map is collected, and based on the fingerprint pre-collection map and the preset pre-collection end condition, it is determined whether to enter the identification map During the collection process, and after entering the identification map collection process, a fingerprint identification map is collected, and the fingerprint identification map is used to unlock the display screen. In this technical solution, by setting the pre-collection end condition including the pre-collection target brightness value, the fingerprint identification map can be triggered to be collected after the brightness of the fingerprint pre-collection map (i.e., the fingerprint spot brightness) reaches the target brightness, thereby ensuring that the fingerprint identification map is The quality can thereby improve the unlocking success rate of fingerprint recognition.

Optionally, in order to allow readers to have a deeper understanding of the implementation principles of the embodiments of the present application, the embodiment shown in Figure 3 will be further detailed in conjunction with the following Figures 5 to 8.

Illustratively, FIG. 5 is a schematic flowchart of Embodiment 2 of the fingerprint identification method provided by the embodiment of the present application. As shown in Figure 5, in this embodiment, the above S302 can be implemented through the following steps:

S501. Determine whether the pre-acquisition target brightness value is equal to 0; if so, execute S502; if not, execute S503. That is, determining whether to enter the identification map collection process based on the fingerprint pre-collection map and the preset pre-collection end conditions includes:

In this embodiment, during the pre-image collection process, a judgment process is performed every time a fingerprint pre-image is collected. This judgment process is used to determine whether to exit the pre-image collection process and enter the fingerprint identification map collection process. During the pre-collection image collection process, the fingerprint identification device collects a frame of fingerprint pre-collection image, and then can calculate the pre-collection brightness value of the fingerprint pre-collection image.

In this step, referring to S302 in Figure 3 above, it can be seen that the pre-collection end condition includes the pre-collection target brightness value. Therefore, when a frame of fingerprint pre-collection image is obtained, it can first be based on whether the pre-collection target brightness value is equal to 0. The judgment results are used to determine subsequent operations.

S502. Confirm to enter the identification map collection process.

As an example, if the preset pre-collection target brightness value is equal to 0, that is, regardless of the brightness of the fingerprint pre-collection map, you can exit the pre-collection map collection process and enter the identification map collection process.

It can be understood that the pre-collection brightness value of the fingerprint pre-collection map is usually greater than 0, and this embodiment does not limit the brightness value of the fingerprint pre-collection map.

S503. Determine whether to enter the identification map collection process according to the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value.

As another example, if the preset pre-collection target brightness value is not equal to 0 (that is, greater than 0), then the pre-collection brightness value of the fingerprint pre-collection image can be obtained by detection or calculation, and then based on the fingerprint pre-collection image The pre-acquisition brightness value of the acquired image and the above-mentioned pre-acquisition target brightness value determine whether to enter the identification image acquisition process.

It can be understood that the brightest part in the fingerprint pre-collection image is usually the optical center of the fingerprint pre-collection image, that is, the pre-collection brightness value of the fingerprint pre-collection image is the brightness value of the optical center. In this embodiment, the optical center of the fingerprint pre-collection map is the optical center calculated during the mass production test of the terminal device, which is more accurate and reliable than the center of the fingerprint pre-collection map.

In the embodiment of the present application, when obtaining a currently collected frame of fingerprint pre-collection image, first determine whether the pre-collection target brightness value is equal to 0. If the pre-collection target brightness value is equal to 0, then directly enter the identification map collection process; if If the pre-collection target brightness value is not equal to 0, then it is determined whether to enter the identification map collection process based on the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value. In this technical solution, by presetting the pre-sampling target brightness value, and when the brightness of a frame of fingerprint pre-sampling image collected meets the requirements, only one frame of fingerprint pre-sampling image can be collected to enter the identification map collection process, which is time-consuming. Very little, and it will have even less impact on the collection of subsequent fingerprint identification maps.

Optionally, based on the above embodiment shown in Figure 5, Figure 6 is a schematic flowchart of Embodiment 3 of the fingerprint identification method provided by the embodiment of the present application.

As shown in Figure 6, the above S503 can be implemented through the following steps:

S601. According to the pre-collection brightness value of the fingerprint pre-collection image and the pre-collection target brightness value, determine whether the pre-collection brightness value of the fingerprint pre-collection map meets the preset brightness requirement; if yes, execute S602; if not, execute S603 and S604. That is, determining whether to enter the identification map collection process based on the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value includes:

If the pre-collection brightness value of the fingerprint pre-collection map does not meet the preset brightness requirement, the total number of frames of the fingerprint pre-collection map that has been collected is determined. According to the total number of frames of the fingerprint pre-collection map and the maximum number of pre-collection map frames, Determine whether to enter the identification map collection process.

Optionally, if the preset pre-collection target brightness value is not equal to 0, determine whether the pre-collection brightness value of the fingerprint pre-collection image meets the preset brightness requirement, and then perform subsequent operations based on the judgment result.

Optionally, in this embodiment, the preset brightness requirement can be characterized by the following formula:

(A2-A1)/A2＜H2

Among them, A2 is the pre-collection target brightness value, A1 is the pre-collection brightness value of the fingerprint pre-collection image, and H2 is the preset threshold. Therefore, the meaning of this formula is: if the pre-collection brightness value A1 of the fingerprint pre-collection image is greater than the pre-collection target brightness value A2, then the pre-collection brightness value A1 of the fingerprint pre-collection image is considered to meet the preset brightness requirements, or if the fingerprint pre-collection image The percentage of the pre-acquisition brightness value A1 of the captured image that is less than the pre-acquisition target brightness value A2 is less than the preset threshold H2, that is, the difference between the pre-acquisition target brightness value A2 minus the fingerprint pre-acquisition image A1 and the percentage of the pre-acquisition target brightness value A2 If it is less than the preset threshold H2, it is considered that the pre-collection brightness value of the fingerprint pre-collection image meets the preset brightness requirements; otherwise, it is considered that the preset brightness requirements are not met.

In a possible design, the value of H2 is between 0 and 1, for example, H2=0.5. That is to say, when the value of (A2-A1)/A2 is less than 0.5, it is considered to be the brightness value of the current fingerprint spot. If the highlighted requirements are met, you can enter the identification map collection process and collect fingerprint identification maps. Optional, H2=0.2, at this time, the brightness requirement of the current fingerprint spot is higher, which can further improve the performance of subsequent fingerprint recognition. Under this threshold, the brightness of the fingerprint spot can be ensured to meet the needs of fingerprint recognition, ensure the effect of fingerprint recognition, and improve the user experience. In general, the pre-collection brightness value of the fingerprint pre-collection image is greater than 0.

S602. Confirm to enter the identification map collection process.

In a possible implementation, if the pre-collection brightness value of the fingerprint pre-collection map meets the preset brightness requirement, it is determined to enter the identification map collection process, and the fingerprint identification device collects the fingerprint identification map for fingerprint recognition, that is, it can be used for display The screen of the screen is unlocked.

S603. Determine the total number of frames of collected fingerprint pre-collection images.

In another possible design, if the pre-collection brightness value of the fingerprint pre-collection map does not meet the preset brightness requirements, the total number of frames of the fingerprint pre-collection map that has been collected is determined, and then it is determined whether to exit the pre-collection map collection process and enter Identification map collection process, or continue to collect fingerprint pre-collection maps.

S604. Determine whether to enter the identification map collection process based on the total number of fingerprint pre-collection frames and the maximum number of pre-collection frames.

In this embodiment, the above pre-collection end condition also includes the maximum number of pre-collection image frames. Therefore, when the pre-collection target brightness value is not equal to 0, and the pre-collection brightness value of the fingerprint pre-collection map does not meet the preset brightness requirements, it can also be determined based on the total number of frames of the fingerprint pre-collection map collected during the pre-collection map collection process. Whether to exit the pre-collection map collection process and enter the fingerprint identification map collection process, or to continue collecting fingerprint pre-collection maps.

For example, if the total number of frames of fingerprint pre-acquisition images is greater than or equal to the maximum number of pre-acquisition image frames, exit the pre-acquisition image collection process and determine to enter the identification map collection process; if the total number of frames of fingerprint pre-acquisition images is less than the maximum number of pre-acquisition images frame number, continue to execute the pre-collection image collection process, that is, continue to collect one frame of fingerprint pre-collection image, and perform the judgment process of each step in Figure 5 and Figure 6 until the pre-collection brightness of the last frame of fingerprint pre-collection image collected The value satisfies the pre-mining end conditions.

Optionally, the preset maximum number of pre-capture image frames can be set to N1, that is, a maximum of N1 frames of fingerprint pre-capture images can be collected during the pre-capture image collection process, and a maximum of N1 loop processes can be executed. For example, N1 can be any value greater than 1, for example, 10, 20, or 100. The embodiment of the present application does not limit the specific value of N1, which can be set according to actual requirements.

It can be understood that in the embodiment of the present application, if multiple frames of fingerprint pre-capture images are collected during the pre-capture image collection process, the pre-capture brightness value used specifically refers to the brightness value of the last frame of fingerprint pre-capture image.

In the embodiment of the present application, it is determined whether the pre-collection brightness value of the fingerprint pre-collection map meets the preset brightness requirement based on the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value. If so, it is determined to enter the identification map. Collection process, if not, determine the total number of frames of fingerprint pre-collection images that have been collected, and determine whether to enter the identification map collection process based on the total number of frames of fingerprint pre-collection images and the maximum number of pre-collection image frames. In this technical solution, by setting the brightness requirements and the maximum number of pre-acquisition image frames, it can ensure that the brightness of the fingerprint pre-acquisition image meets the requirements to the greatest extent, and the fingerprint identification image collection process can be entered in time, effectively reducing the time of the pre-acquisition image collection process. Impact on the recognition map collection process.

Illustratively, FIG. 7 is a schematic flowchart of Embodiment 4 of the fingerprint identification method provided by the embodiment of the present application. As shown in Figure 7, in this embodiment, the fingerprint identification method may also include the following steps:

S701. Based on the fingerprint recognition map and preset fingerprint information, execute the unlocking process of the display screen, that is, the screen unlocking of the display screen.

Optionally, in this embodiment, after the fingerprint identification map is collected during the identification map collection process, fingerprint recognition or fingerprint unlocking can be performed, that is, the unlocking process of the display screen. Specifically, the fingerprint identification map is compared with the preset fingerprint information. If the fingerprint identification map matches the preset fingerprint information, it is determined that the fingerprint identification is successful, that is, the display screen is unlocked successfully; if the fingerprint identification map matches the preset fingerprint information If there is no match, it is determined that the fingerprint recognition failed, that is, the display screen unlocking failed.

It can be understood that the preset fingerprint information refers to the fingerprint feature information authorized before this fingerprint identification process, which is not limited in this embodiment.

Optionally, in this solution, if the fingerprint recognition fails, that is, the display fails to be unlocked, a prompt message can be pushed. The prompt message is used to prompt the user to perform fingerprint recognition again, and then re-implement the technical solution of this application, or prompt the user to end Fingerprint identification process.

S702. Determine whether the target value update condition is met based on whether the display screen is successfully unlocked, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image; if so, execute S703; if not, end the process.

That is, based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image, it is determined whether the target value update condition is met;

When the target value update conditions are not met, the process ends. For example, in this embodiment, the target value update conditions may include that the display screen is unlocked successfully, the touch area of fingerprint recognition is greater than the preset area threshold, and the brightness value of the fingerprint recognition image is less than the set brightness threshold. That is, when the display screen is unlocked successfully and the touch area and fingerprint recognition map brightness value meet the set conditions, it is considered that the pre-collection target brightness value meets the target value update condition, and the execution of the pre-collection target brightness value update process can be triggered, thereby enabling Ensure that the pre-acquisition target brightness value used in the pre-acquisition image collection process is more accurate. This application can dynamically adjust the pre-acquisition target brightness value. Even if the display screen ages or the user changes fingers, the dynamic threshold can better reflect the accurate display brightness value/fingerprint spot brightness value, improving fingerprint recognition performance and user experience.

Correspondingly, when the display screen is unlocked successfully, the touch area of fingerprint recognition and the brightness value of the fingerprint recognition image can be obtained to determine whether to update the pre-collection target brightness value, which can effectively ensure the dynamics and accuracy of the pre-collection target brightness value.

Among them, the touch area of fingerprint recognition can be interpreted as the pressing area or touch area of the user when performing fingerprint recognition. It can be the area of the area covered by the user's fingerprint during the fingerprint collection process, which is different from the area of the fingerprint recognition map.

In the existing solution, the threshold for judging the highlight of the fingerprint spot (that is, the pre-acquisition target brightness value in this embodiment) is fixed. However, with the use of terminal equipment, the display screen ages or the user's finger is replaced. , there may be a problem of inaccurate pre-collected brightness values. Therefore, this embodiment can update the pre-collected target brightness value when it meets the target value update condition, so that the dynamic threshold can better reflect the accurate display screen brightness value.

Correspondingly, in the embodiment of the present application, it is first determined whether the above-mentioned display screen is unlocked successfully, whether the touch area of fingerprint recognition is greater than the preset area threshold and whether the brightness value of the fingerprint recognition image is less than the set brightness threshold; if so, it is determined that the target is met Value update condition; if not, end the process.

Among them, when the display screen is unlocked successfully, the current pre-collection brightness value meets the highlighting requirements, that is, the fingerprint spot meets the brightness requirements for fingerprint recognition. Therefore, only when the unlocking is successful, it is possible to update the pre-collection target brightness value, that is, Successful unlocking of the display is a constraint on updating the pre-acquisition target brightness value.

The touch area of fingerprint recognition is larger than the preset area threshold, which is a restriction for updating the pre-acquisition target brightness value. It can be considered that only when the touch area is larger than the preset area threshold, the fingerprint feature information contained in the collected fingerprint identification map will be complete and sufficient for fingerprint identification. Therefore, it is believed that the successful unlocking of the display is related to the spot brightness/image brightness. . Therefore, the touch area of fingerprint recognition is a condition for target value update.

Whether the brightness value of the fingerprint recognition image is less than the set brightness threshold is another restriction condition for updating the pre-acquisition target brightness value. Setting the brightness threshold can be considered as the saturated brightness value of the fingerprint recognition image. If the brightness value of the fingerprint recognition image is greater than or equal to the set brightness threshold, that is, the fingerprint recognition device is saturated, it is considered that the brightness value of the fingerprint recognition image is a strong light value, and the current is a strong light environment. If the brightness value of the fingerprint recognition image is less than the set brightness value, If the brightness threshold is set, the brightness value of the fingerprint recognition image is considered to be a non-strong light value, and the current environment is a non-strong light environment. Since the fingerprint recognition device may not be able to accurately complete fingerprint recognition after it is saturated, in this embodiment, it can be determined whether the brightness value of the fingerprint recognition image is less than the set brightness threshold, and when the brightness value of the fingerprint recognition image is less than the set brightness threshold, Only then is it possible to perform the update process of the pre-acquisition target brightness value.

S703. Update the pre-acquisition target brightness value.

For example, in this embodiment, when it is determined that the target value update condition is met, the pre-collection target brightness value may be updated according to the pre-collection brightness value of the fingerprint pre-collection map.

Optionally, if multiple frames of fingerprint pre-collection images are collected during the fingerprint image pre-collection process, the pre-collection target brightness value is updated according to the pre-collection brightness value of the last frame of the fingerprint pre-collection image in the above-mentioned multi-frame fingerprint pre-collection images.

In this step, the current value of the pre-sampling target brightness value is first determined, and an update method of the pre-sampling target brightness value is determined based on the current value of the pre-sampling target brightness value.

As an example, if the pre-collection target brightness value is equal to 0, then the pre-collection brightness value of the above-mentioned fingerprint pre-collection image is assigned to the pre-collection target brightness value. In the same way, if multiple frames of fingerprint pre-collection images are collected during the fingerprint image pre-collection process, the pre-collection brightness value of the last frame of the fingerprint pre-collection image in the above-mentioned multi-frame fingerprint pre-collection images is assigned to the pre-collection target brightness value.

As another example, if the current value of the pre-acquisition target brightness value is greater than 0, then the average brightness value of the pre-acquisition brightness value of the fingerprint pre-acquisition image and the pre-acquisition target brightness value is assigned to the pre-acquisition target brightness value. Similarly, if multiple frames of fingerprint pre-collection images are collected during the process of fingerprint image pre-collection, the average of the pre-collection brightness value and the pre-collection target brightness value of the last frame of fingerprint pre-collection image in at least one frame of fingerprint pre-collection image will be used. The brightness value is assigned to the pre-acquisition target brightness value.

In a possible design of this application, if the above-mentioned display screen is unlocked successfully, the fingerprint touch area of fingerprint recognition is greater than the preset area threshold and the brightness value of the fingerprint recognition image is less than the set brightness threshold. At this time, the pre-acquisition target brightness value theory Updates can be made on. However, in order to avoid frequent updates of the pre-acquisition target brightness value, the number of intervals between the current target value update condition and the last actual target value update can be counted (in this embodiment, it is called the number of interval updates).

It can be understood that when the display screen is unlocked successfully, the touch area of fingerprint recognition is greater than the preset area threshold and the brightness value of the fingerprint recognition image is less than the set brightness threshold, the number of interval updates of the pre-acquisition target brightness value can be increased by 1, and then the The updated interval update number is determined as the current interval update number of the pre-acquisition target brightness value.

Correspondingly, in the embodiment of the present application, if the above-mentioned pre-collection target brightness value is greater than 0, then the average brightness value of the pre-collection brightness value of the fingerprint pre-collection image and the pre-collection target brightness value is assigned to the pre-collection target brightness value The implementation plan can be as follows:

If the current interval update number of the pre-acquisition target brightness value is greater than the preset interval update times threshold, then the average brightness value of the pre-acquisition brightness value of the fingerprint pre-acquisition map and the pre-acquisition target brightness value is assigned to the pre-acquisition target brightness value; or

If the current interval update times of the pre-acquisition target brightness value are less than or equal to the preset interval update times threshold, continue to determine whether the target value update conditions are met based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition map. .

In this step, in order to avoid resource consumption caused by frequent updates of the pre-acquisition target brightness value, the interval update times threshold can be preset. Therefore, it can be judged whether the current interval update times is greater than the interval update times threshold; if the current interval update times is greater than the interval If the update times threshold is set, it is considered that the pre-acquisition target brightness value meets the target value update conditions, and the update operation of the pre-acquisition target brightness value can be performed; if the current interval update times are less than or equal to the interval update times threshold, it is considered that the pre-acquisition target brightness value has not been updated. To meet the target value update conditions, you need to continue to determine whether the target value update conditions are met based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image.

For example, the interval update times threshold may be a value set according to actual requirements, for example, 5 times, 6 times, 10 times, etc., which is not limited in this embodiment.

The update method of the pre-collection target brightness value adopted in this embodiment can dynamically adjust the pre-collection target brightness value to adapt to the current environment or equipment needs, improve the accuracy and universality of the pre-collection target brightness value, and improve the success rate of fingerprint recognition in the future. Foundation.

In the embodiment of the present application, by setting the target value update condition and the interval update times threshold, the accuracy and universality of the pre-collected target brightness value can be improved, laying a foundation for subsequent improvement of the success rate of fingerprint recognition.

In summary, it can be seen that the above-mentioned embodiments of the present application do not distinguish between entering fingerprint recognition from the screen-on state and entering fingerprint recognition from the screen-off state. That is, this solution can be applied to entering fingerprint recognition from the screen-on state and/or the screen-off state. scene.

It is understandable that the unlocking success rate is relatively high when the screen is turned on and fingerprint recognition is entered. However, with the use of terminal equipment, if the display screen is aging and the unlocking success rate is reduced, the technical solution of this application can be used to deal with it. , which will not be described again in this embodiment.

In practical applications, the brightness of fingerprint spots in the screen-on state and the screen-off state are different. Normally, the brightness of the fingerprint spot when the display screen is in the screen-on state can meet the brightness requirements. The fingerprint identification method also includes: When touching the fingerprint recognition area on the display screen,

If the display screen is on, you can directly enter the above identification map collection process;

If the display screen is not on, that is, the screen is off, the process of pre-capture image collection will be entered to collect the fingerprint pre-capture image.

For example, when it is detected that a finger touches the fingerprint recognition area, the status of the display screen is first judged. When the display screen is in a bright screen state, its fingerprint light spot generally meets the needs of fingerprint recognition, and the fingerprint recognition map collection process is directly entered. Only When the display screen is in the off-screen state, the fingerprint pre-collection image is collected to determine whether the current fingerprint light spot meets the needs of fingerprint recognition. This can further improve the efficiency of fingerprint recognition and improve the user experience. Optionally, the following uses a specific embodiment to explain the execution of the fingerprint identification method provided by the embodiment of the present application by entering the fingerprint identification scene from the screen-off state. That is, when it is determined that the display screen is in the on-screen state, the pre-collection image collection process is skipped and the identification map collection process is directly entered; when the display screen is in the off-screen state, the pre-collection picture collection process is first entered to collect the fingerprint pre-collection map, and then Determine whether the fingerprint light spot meets the requirements for fingerprint identification. If it meets the requirements, it will enter the identification map collection process and complete the screen unlocking of the display, that is, fingerprint identification. When the fingerprint identification is completed, it will enter the pre-acquisition target brightness value update process as appropriate to ensure that the fingerprint Recognition performance and efficiency.

As an optional embodiment, in Figure 7, before S702, it can also be determined whether S701 enters the screen unlocking process of the display screen from the on-screen state, or enters the screen unlocking process of the display screen in the off-screen state, for further confirmation. Whether to enter the pre-collection target brightness value update process, that is, confirm whether the pre-collection target brightness value needs to be updated.

Specifically, before determining whether the target value update condition is met based on whether the display screen is successfully unlocked, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image, the method further includes:

It can be understood that when the display screen is in the off-screen state, the pre-acquisition target brightness value is dynamically updated according to the target value update condition to improve the performance of fingerprint recognition; when the display screen is in the on-screen state, under normal circumstances, the fingerprint The brightness of the light spot can meet the requirements of fingerprint recognition. At this time, the process can be ended directly after unlocking the display screen, improving the efficiency of fingerprint recognition. Of course, in order to improve the accuracy of fingerprint recognition, the display screen enters fingerprint recognition from the bright screen state, and the pre-collection target brightness value can also be dynamically updated according to the target value update conditions.

Illustratively, Figure 8 is a schematic flowchart of Embodiment 5 of the fingerprint identification method provided by the embodiment of the present application. As shown in Figure 8, the fingerprint identification method may include the following steps:

S801. Determine whether the display screen is in a bright screen state; if not, enter the pre-acquisition image collection process S81 and execute S811; if yes, enter the identification image acquisition process S82 and execute S821;

S811. Collect fingerprint pre-collection images;

S812. Calculate the pre-collection brightness value A1 of the fingerprint pre-collection image;

S813. Determine whether the preset pre-acquisition target brightness value A2 is greater than 0; if so, execute S814; if not, enter the identification map collection process S82 and execute S821;

S814. Determine whether (A2-A1)/A2<H2 is satisfied; if yes, enter the identification map collection process S82 and execute S821; if not, execute S815;

S815. Determine whether the total number of fingerprint pre-acquisition image frames n1 is less than the maximum number of pre-acquisition image frames N1; if so, go to S811; if not, enter the identification map collection process S82 and execute S821.

S821. Collect fingerprint identification images.

Optionally, the exposure time of the fingerprint identification map is greater than the exposure time of the fingerprint pre-collection map, and the size of the fingerprint identification map is greater than the size of the fingerprint pre-collection map. Usually, the exposure time of the fingerprint pre-capture image is short, for example, it can be 2ms.

S822. Based on the fingerprint recognition map and preset fingerprint information, execute the unlocking process of the display screen, that is, the screen unlocking of the display screen.

Optionally, after S822, the method also includes the following steps:

S802. Determine whether the identification map collection process is entered from the bright screen state; if so, end the process; if not, enter the pre-collection target brightness value update process S83, and execute S831.

S831. Determine whether the target value update condition is met; if so, execute S832; if not, end the process.

Among them, the target value update conditions include: the display screen is unlocked successfully, the touch area of fingerprint recognition is greater than the preset area threshold, and the brightness value of the fingerprint recognition image is less than the set brightness threshold.

S832. Control the number of interval updates of the pre-acquisition target brightness value A2 to be increased by 1;

That is to say, when the display screen is unlocked successfully, the touch area of fingerprint recognition is greater than the preset area threshold, and the brightness value of the fingerprint recognition image is less than the set brightness threshold, the number of interval updates of the pre-collection target brightness value is increased by 1.

S833. Determine whether the pre-collection target brightness value A2 is equal to 0 or whether the current interval update number n2 of the pre-collection target brightness value A2 is greater than the preset interval update count threshold N2; if yes, execute S834; if not, end the process.

S834. Update A2 according to A1.

Specifically, if the pre-collection target brightness value is equal to 0, then the pre-collection brightness value A1 of the fingerprint pre-collection image is assigned to the pre-collection target brightness value A2;

If the pre-capture target brightness value is greater than 0, the average brightness value of the pre-capture brightness value A1 and the pre-capture target brightness value A2 of the fingerprint pre-capture image is assigned to the pre-capture target brightness value A2.

If the pre-collection target brightness value is greater than 0, then the average brightness value of the pre-collection brightness value A1 and the pre-collection target brightness value A2 of the fingerprint pre-collection image is assigned to the pre-collection target brightness value A2, including:

If the current interval update number n2 of the pre-acquisition target brightness value A2 is greater than the preset interval update times threshold N2, then the average brightness value of the pre-acquisition brightness value A1 of the fingerprint pre-acquisition map and the pre-acquisition target brightness value A2 is assigned to the pre-acquisition Target brightness value A2; or

If the current interval update number n2 of the pre-acquisition target brightness value A2 is less than or equal to the preset interval update number threshold N2, continue to determine whether the target is met based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image. Value update condition.

For the specific implementation of each step in this embodiment, please refer to the detailed descriptions in the above embodiments, and will not be described again here.

Illustratively, based on the content described in the above embodiments, FIG. 9 is a schematic diagram showing the brightness of the fingerprint pre-acquisition image and/or the fingerprint recognition image changing with time. As shown in Figure 9, when the display is in the off-screen state, the brightness of the collected fingerprint pre-collection pictures is 0, for example, the fingerprint pre-collection picture 0 and the fingerprint pre-collection picture 1 in Figure 9; as the fingerprint pre-collection pictures When collecting the image, for example, at 10 milliseconds, the brightness of the fingerprint spot in the fingerprint recognition area gradually becomes brighter, causing the brightness of the collected fingerprint pre-collection image to increase, for example, the fingerprint pre-collection image 2 to the fingerprint pre-collection image n-1 The brightness changes to the first brightness; then, for example, at 20 milliseconds, the light spot in the fingerprint recognition area becomes brighter, for example, the second brightness, and correspondingly, the brightness of the fingerprint pre-snap image increases, for example, the fingerprint pre-snap image The brightness after n becomes the second brightness. It is not until the brightness value of the fingerprint pre-acquisition image meets the highlight requirements/the fingerprint spot brightness value meets the requirements of fingerprint identification that the fingerprint identification image is collected, which avoids the problem of insufficient brightness of the fingerprint light spot. Fingerprint recognition is unsuccessful, which improves the performance and user experience of the fingerprint recognition device.

Figure 10 is a schematic structural diagram of a fingerprint identification device provided by an embodiment of the present application. As shown in Figure 10, the fingerprint identification device 1000 includes:

The acquisition module 1001 is used to collect a fingerprint pre-acquisition map when a touch operation targeting the fingerprint recognition area on the display screen is detected;

Exemplarily, the collection module 1001 includes a pixel unit array.

The processing module 1002 is configured to determine whether to enter the identification map collection process based on the fingerprint pre-collection map and preset pre-collection end conditions, where the pre-collection end condition includes the pre-collection target brightness value;

The collection module 1001 is configured to collect a fingerprint identification pattern after entering the identification pattern collection process, and the fingerprint identification pattern is used to unlock the screen of the display screen.

In one possible design of this embodiment, the processing module 1002 is specifically used to:

Optionally, the processing module 1002 is specifically used for:

(A2-A1)/A2＜H2

Optionally, the processing module 1002 is specifically used for:

In a possible design of this embodiment, the processing module 1002 is also used to:

When the target value update conditions are not met, the process ends.

The target value update conditions include: the display screen is unlocked successfully, the touch area is greater than a preset area threshold and the fingerprint recognition image brightness value is less than a set brightness threshold.

Optionally, the processing module 1002 is specifically configured to update the pre-collection target brightness value according to the pre-collection brightness value of the fingerprint pre-collection map.

Optionally, the processing module 1002 is specifically used for:

Optionally, the processing module 1002 is also configured to set the current interval update number of the pre-collection target brightness value to 0 after the pre-collection target brightness value is updated.

Optionally, the processing module 1002 is specifically configured to, if the current interval update number of the pre-acquisition target brightness value is greater than a preset interval update number threshold, combine the pre-acquisition brightness value of the fingerprint pre-acquisition map and the pre-acquisition brightness value. Assign the average brightness value of the pre-collection target brightness value to the pre-collection target brightness value; or

Optionally, the fingerprint pre-collection map is smaller than the fingerprint identification map, and the exposure time of the fingerprint pre-collection map is shorter than the exposure time of the fingerprint identification map. The fingerprint pre-acquisition image is used to determine whether the fingerprint spot meets the highlight requirements, that is, the brightness requirements required for fingerprint recognition. It is not directly used for fingerprint recognition, so a complete fingerprint image is not required. This setting can improve the ability to determine the brightness of the fingerprint spot. efficiency and improve user experience.

In one embodiment of the present application, the processing module 1002 is also configured to directly enter the screen if a touch operation targeting the fingerprint recognition area on the display screen is detected and the display screen is in a bright screen state. In the identification map collection process, if the display screen is in a screen-off state, the fingerprint pre-collection map is collected.

Before determining whether the target value update condition is met based on whether the display screen is successfully unlocked, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image, the processing module 1002 is also used to:

The fingerprint identification device provided by the embodiments of the present application can be used to perform the fingerprint identification method in any of the above method embodiments. Its implementation principles and technical effects are similar, and will not be described in detail here.

According to an embodiment of the present application, a terminal device is also provided. The terminal device includes:

The fingerprint identification device is the fingerprint identification device shown in Figure 10.

It can be understood that the various numerical numbers involved in the embodiments of the present application are only for convenience of description and are not used to limit the scope of the embodiments of the present application. In the embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its functions and internal logic, and should not constitute the implementation process of the embodiments of the present application. Any limitations.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. scope.

Claims

A fingerprint identification method, characterized by including:

When a touch operation targeting the fingerprint recognition area on the display screen is detected, a fingerprint pre-acquisition map is collected;

Determine whether to enter the identification map collection process according to the fingerprint pre-collection map and the preset pre-collection end condition, where the pre-collection end condition includes the pre-collection target brightness value;

After entering the identification pattern collection process, a fingerprint identification pattern is collected, and the fingerprint identification pattern is used for screen unlocking of the display screen.
The method according to claim 1, characterized in that determining whether to enter the identification map collection process based on the fingerprint pre-collection map and preset pre-collection end conditions includes:

If the brightness value of the pre-acquisition target is equal to 0, it is determined to enter the identification map collection process;

If the pre-collection target brightness value is greater than 0, it is determined whether to enter the identification map collection process based on the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value.
The method according to claim 2, wherein determining whether to enter the identification map collection process based on the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value includes:

If the pre-collection brightness value of the fingerprint pre-collection map meets the preset brightness requirements, it is determined to enter the identification map collection process;

If the pre-collection brightness value of the fingerprint pre-collection map does not meet the preset brightness requirement, the total number of frames of the fingerprint pre-collection map that has been collected is determined. According to the total number of frames of the fingerprint pre-collection map and the maximum number of pre-collection map frames, Determine whether to enter the identification map collection process.
The method according to claim 3, characterized in that the preset brightness requirement is characterized by the following formula:

(A2-A1)/A2＜H2

Wherein, A2 is the pre-collection target brightness value, A1 is the pre-collection brightness value of the fingerprint pre-collection image, and H2 is a preset threshold.
The method according to claim 4, characterized in that the value of H2 is between 0 and 1.
The method according to claim 5, characterized in that H2=0.5.
The method according to any one of claims 3 to 6, characterized in that determining whether to enter the identification map collection process based on the total number of frames of the fingerprint pre-collection map and the maximum number of frames of the pre-collection map includes:

If the total number of frames of the fingerprint pre-collection images is greater than or equal to the maximum number of frames of the pre-acquisition images, it is determined to enter the identification map collection process;

If the total number of frames of fingerprint pre-collection images is less than the maximum number of frames of pre-acquisition images, continue to collect one frame of fingerprint pre-acquisition images.
The method according to any one of claims 1 to 7, further comprising:

Based on the fingerprint recognition map and preset fingerprint information, perform screen unlocking of the display screen;

Determine whether the target value update condition is met based on whether the display screen is successfully unlocked, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image;

When the target value update condition is met, update the pre-collection target brightness value; or

When the target value update conditions are not met, the process ends.
The method according to claim 8, characterized in that the target value update conditions include: the display screen is unlocked successfully, the touch area is greater than a preset area threshold and the fingerprint recognition image brightness value is less than a set value. Brightness threshold.
The method according to claim 8 or 9, wherein updating the pre-collection target brightness value includes: updating the pre-collection target brightness value according to the pre-collection brightness value of the fingerprint pre-collection map.
The method according to claim 10, characterized in that, updating the pre-collection target brightness value according to the pre-collection brightness value of the fingerprint pre-collection map includes:

If the pre-collection target brightness value is equal to 0, then assign the pre-collection brightness value of the fingerprint pre-collection map to the pre-collection target brightness value;

If the pre-collection target brightness value is greater than 0, then the average brightness value of the pre-collection brightness value of the fingerprint pre-collection image and the pre-collection target brightness value is assigned to the pre-collection target brightness value.
The method according to claim 11, characterized in that when the display screen is unlocked successfully, the touch area is greater than a preset area threshold and the brightness value of the fingerprint recognition image is less than a set brightness threshold, the pre-sampling The number of interval updates of the target brightness value is increased by 1.
The method of claim 12, further comprising:

After the pre-collection target brightness value is updated, the current interval update number of the pre-collection target brightness value is set to 0.
The method according to any one of claims 11 to 13, characterized in that if the brightness value of the pre-sampling target is greater than 0, then the pre-sampling brightness value of the fingerprint pre-sampling image and the pre-sampling target The average brightness value of the brightness value is assigned to the pre-acquisition target brightness value, including:

If the current interval update number of the pre-sampling target brightness value is greater than the preset interval update times threshold, then the pre-sampling brightness value of the fingerprint pre-sampling map and the average brightness value of the pre-sampling target brightness value are assigned to the pre-sampling target brightness value. The pre-acquisition target brightness value is specified; or

If the current interval update times of the pre-collection target brightness value are less than or equal to the preset interval update times threshold, then continue to determine based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition map. Whether the target value update conditions are met.
The method according to any one of claims 1 to 14, characterized in that the fingerprint pre-collection map is smaller than the fingerprint identification map, and the exposure time of the fingerprint pre-collection map is shorter than the exposure time of the fingerprint identification map.
The method according to any one of claims 1 to 15, characterized in that the method further includes: when a touch operation targeting the fingerprint recognition area on the display screen is detected,

If the display screen is in a bright screen state, directly enter the identification map collection process;

If the display screen is in a screen-off state, the fingerprint pre-collection image is collected.
The method according to any one of claims 8 to 14, characterized in that, based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image, it is determined whether the target value update condition is met. Previously, the method also included:

If the display screen is turned off and the identification map collection process is entered, it is determined whether the target value update condition is met based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition map; or

If the identification map collection process is entered from the display screen-on state, the process ends;

Wherein, the display screen on state or the display screen off state is the state of the display screen when a touch operation on the fingerprint recognition area on the display screen is detected.
A fingerprint identification device, characterized by including:

A collection module used to collect fingerprint pre-collection images when a touch operation targeting the fingerprint recognition area on the display screen is detected;

A processing module configured to determine whether to enter the identification map collection process based on the fingerprint pre-collection map and preset pre-collection end conditions, where the pre-collection end conditions include the pre-collection target brightness value;

The collection module is also configured to collect a fingerprint identification pattern after entering the identification pattern collection process, and the fingerprint identification pattern is used to unlock the screen of the display screen.
The device according to claim 18, characterized in that the processing module is specifically used for:

If the brightness value of the pre-acquisition target is equal to 0, it is determined to enter the identification map collection process;

If the pre-collection target brightness value is greater than 0, then it is determined whether to enter the identification map collection process based on the pre-collection brightness value of the fingerprint pre-collection map and the pre-collection target brightness value.
The device according to claim 19, characterized in that the processing module is specifically used for:

If the pre-collection brightness value of the fingerprint pre-collection map meets the preset brightness requirements, it is determined to enter the identification map collection process;

If the pre-collection brightness value of the fingerprint pre-collection map does not meet the preset brightness requirement, the total number of frames of the fingerprint pre-collection map that has been collected is determined. According to the total number of frames of the fingerprint pre-collection map and the maximum number of pre-collection map frames, Determine whether to enter the identification map collection process.
The device according to claim 20, wherein the preset brightness requirement is characterized by the following formula:

(A2-A1)/A2＜H2

Wherein, A2 is the pre-collection target brightness value, A1 is the pre-collection brightness value of the fingerprint pre-collection image, and H2 is a preset threshold.
The device according to claim 21, characterized in that the value of H2 is between 0 and 1.
The device according to claim 22, characterized in that H2=0.5.
The device according to any one of claims 20 to 23, characterized in that the processing module is specifically used for:

If the total number of frames of the fingerprint pre-collection images is greater than or equal to the maximum number of frames of the pre-acquisition images, it is determined to enter the identification map collection process;

If the total number of frames of fingerprint pre-collection images is less than the maximum number of frames of pre-acquisition images, continue to collect one frame of fingerprint pre-acquisition images.
The device according to any one of claims 18 to 24, characterized in that the processing module is also used to:

Based on the fingerprint recognition map and preset fingerprint information, perform screen unlocking of the display screen;

Determine whether the target value update condition is met based on whether the display screen is successfully unlocked, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image;

When the target value update condition is met, update the pre-collection target brightness value; or

When the target value update conditions are not met, the process ends.
The device according to claim 25, wherein the target value update conditions include: the display screen is unlocked successfully, the touch area is greater than a preset area threshold and the fingerprint recognition image brightness value is less than a set value. Brightness threshold.
The device according to claim 25 or 26, characterized in that the processing module is specifically configured to update the pre-collection target brightness value according to the pre-collection brightness value of the fingerprint pre-collection map.
The device according to claim 27, characterized in that the processing module is specifically used for:

If the pre-collection target brightness value is equal to 0, then the pre-collection brightness value of the pattern pre-collection image is assigned to the pre-collection target brightness value;

If the pre-collection target brightness value is greater than 0, then the average brightness value of the pre-collection brightness value of the fingerprint pre-collection image and the pre-collection target brightness value is assigned to the pre-collection target brightness value.
The device according to claim 28, characterized in that when the display screen is unlocked successfully, the touch area is greater than a preset area threshold and the brightness value of the fingerprint recognition image is less than a set brightness threshold, the pre-sampling The number of interval updates of the target brightness value is increased by 1.
The device according to claim 29, wherein the processing module is further configured to set the current interval update number of the pre-collection target brightness value to 0 after the pre-collection target brightness value is updated.
The device according to any one of claims 28 to 30, characterized in that the processing module is specifically used for:

If the current interval update number of the pre-sampling target brightness value is greater than the preset interval update times threshold, then the pre-sampling brightness value of the fingerprint pre-sampling map and the average brightness value of the pre-sampling target brightness value are assigned to the pre-sampling target brightness value. The pre-acquisition target brightness value is specified; or

If the current interval update times of the pre-collection target brightness value are less than or equal to the preset interval update times threshold, then continue to determine based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition map. Whether the target value update conditions are met.
The device according to any one of claims 18 to 31, wherein the fingerprint pre-collection map is smaller than the fingerprint identification map, and the exposure time of the fingerprint pre-collection map is shorter than the exposure time of the fingerprint identification map.
The device according to any one of claims 18 to 32, wherein the processing module is further configured to detect a touch operation on the fingerprint recognition area on the display screen,

If the display screen is in a bright screen state, directly enter the identification map collection process;

If the display screen is in a screen-off state, the fingerprint pre-collection image is collected.
The device according to any one of claims 25 to 31, wherein it is determined whether the target value update condition is met based on whether the display screen is successfully unlocked, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition image. Previously, the processing module was also used to:

If the display screen is turned off and the identification map collection process is entered, it is determined whether the target value update condition is met based on whether the display screen is unlocked successfully, the touch area of the fingerprint recognition and the brightness value of the fingerprint recognition map; or

If the identification map collection process is entered from the display screen-on state, the process ends;

Wherein, the display screen on state or the display screen off state is the state of the display screen when a touch operation on the fingerprint recognition area on the display screen is detected.
A terminal device, characterized by including:

A display screen, a touch control module, and a fingerprint recognition device provided below the display screen;

The touch control module is used to monitor touch operations above the display screen;

The fingerprint identification device is the fingerprint identification device described in any one of claims 18 to 34.