WO2020232696A1

WO2020232696A1 - Calibration method and device for optical fingerprint identification and electronic equipment

Info

Publication number: WO2020232696A1
Application number: PCT/CN2019/088128
Authority: WO
Inventors: 程雷刚; 邝文静
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-11-26
Also published as: CN112513871A; CN112513871B

Abstract

The embodiments of the present application provide a calibration method and device for optical fingerprint identification, and an electronic equipment. The calibration method for optical fingerprint identification comprises: when a screen displays a screen display light spot and a specific pattern respectively according to the pressing area of a medium, collecting fingerprint images and reference images by means of an optical fingerprint sensor, wherein the fingerprint image is an image containing a fingerprint of the medium, and the reference image is an image containing the specific pattern; detecting the intensity of light displayed on the screen according to the intensity information of the specific pattern in the reference images and detecting the relative displacement of the optical fingerprint sensor and the screen according to the position information of the specific pattern in the reference image; and calibrating the fingerprint image according to the detected intensity of the light displayed on the screen and the relative displacement. According to the present application, the intensity of the light displayed on the screen can be accurately detected in an application process, and a scene where the light intensity of the screen is severe or is changed rapidly is applicable.

Description

Calibration method, device and electronic equipment for optical fingerprint recognition

【Technical Field】

This application relates to the technical field of optical fingerprint recognition, and in particular to a calibration method, device and electronic equipment for optical fingerprint recognition.

【Background technique】

In response to market demand, the display screens in electronic devices (such as mobile phones or tablet computers) are gradually developing towards full screens. The pursuit of higher and higher screen-to-body ratios makes the front capacitive fingerprint nowhere to be placed and will gradually withdraw from the stage of history. The under-screen optical fingerprint solution came into being, which places the optical fingerprint sensor (Sensor) on the back of the display area of the display, which does not occupy the area of the display area, which helps to increase the screen-to-body ratio. The light with fingerprint information can penetrate the screen to reach Optical fingerprint Sensor surface imaging, combined with software algorithms, can realize fingerprint recognition function.

The light penetrating the screen with fingerprint information will inevitably be interfered by the uneven distribution of the internal layers of the screen. In addition, there are also interferences such as uneven light intensity of the light source and inconsistency of the sensor response. These interferences will affect the quality of the fingerprint image. The above-mentioned interference is removed by the calibration algorithm. However, most of the calibration algorithms provided in the related art can only be applied in specific scenarios, and cannot be applied to scenes with severe or rapid changes in light intensity. Although some calibration algorithms are compatible with scenes with severe or rapid changes in light intensity , But also sacrificed the performance of other scenes.

[Content of the invention]

The embodiments of the application provide a calibration method, device and electronic equipment for optical fingerprint recognition to accurately detect the intensity of the light displayed on the screen during the application process, which can be applied to scenes where the intensity of the screen is severe or rapidly changing, and has more Wide application scenarios, and can detect the relative displacement of the optical fingerprint sensor and the screen, which improves the fingerprint recognition performance in the scene where the relative position of the screen and the optical fingerprint sensor changes rapidly.

In the first aspect, an embodiment of the present application provides a calibration method for optical fingerprint recognition, including:

When the screen displays the screen display light spot and the specific pattern according to the pressing area of the medium, the fingerprint image and the reference image are respectively collected by the optical fingerprint sensor, wherein the fingerprint image is an image containing the fingerprint of the medium, and the reference image Is an image containing the specific pattern; the intensity of the light displayed on the screen is detected according to the intensity information of the specific pattern in the reference image, and the position information of the specific pattern in the reference image is detected. The relative displacement of the optical fingerprint sensor and the screen; the fingerprint image is calibrated according to the detected intensity of the light displayed on the screen and the relative displacement.

In one of the possible implementation manners, the calibration method further includes: controlling the screen to display the screen display light spot and the specific pattern according to the pressing area of the medium on the screen.

In one possible implementation manner, the screen display light spot and the specific pattern are displayed on the screen at the same time; wherein, the screen display light spot is displayed at the position of the pressing area, and the specific pattern is superimposed and displayed In the screen display spot; or, the specific pattern and the screen display spot are respectively displayed at different positions in the pressing area.

In one of the possible implementation manners, the specific pattern is superimposed and displayed in the screen display spot, and the specific pattern is a pattern composed of lines with a predetermined width, and the color of the specific pattern is the same as that displayed on the screen. Any color with different light spots.

In one possible implementation manner, the specific pattern and the screen display spot are respectively displayed at different positions in the pressing area, and the specific pattern is a pattern composed of lines with a predetermined width, and the specific pattern The color of is any color different from the background color of the screen.

In one possible implementation manner, the screen display light spot and the specific pattern are displayed on the screen sequentially in a time-sharing manner.

In one possible implementation manner, the specific pattern is a pattern composed of lines with a predetermined width, and the color of the specific pattern is any color different from the background color of the screen.

In one possible implementation manner, the specific pattern is a pattern composed of lines with a predetermined width and a predetermined pattern, and the color of the specific pattern is any color different from the background color of the screen.

In one possible implementation manner, the intensity of the light displayed on the screen is detected according to the intensity information of the specific pattern in the reference image, and the position of the specific pattern in the reference image is detected. The information detecting the relative displacement of the optical fingerprint sensor and the screen includes: detecting the intensity of the light displayed on the screen according to the intensity information of the line pattern of the predetermined width in the reference image, and according to the reference The position information of the predetermined graphic pattern in the image detects the relative displacement of the optical fingerprint sensor and the screen.

In one of the possible implementations, the colors of the predetermined graphics in different positions in the specific pattern are different; the method further includes: after the reference image is collected by an optical fingerprint sensor, the The reflectance of the light of different colors of the predetermined pattern is determined, and the color of the medium is determined to perform anti-counterfeiting detection on the medium.

In one possible implementation manner, the specific pattern is a pattern composed of lines of a predetermined width, or the specific pattern is a blank pattern, and the color of the specific pattern is any color different from the background color of the screen; Wherein, the specific pattern is first displayed on the screen, and then the specific pattern and the screen display spot are superimposed and displayed.

In one possible implementation manner, it further includes: after the specific pattern is displayed on the screen, collecting a frame of an image containing the specific pattern and ambient light by the optical fingerprint sensor; After the specific pattern and the screen display the light spot, a frame of image containing the fingerprint of the medium and the ambient light is collected by the optical fingerprint sensor; and the image containing the fingerprint and ambient light of the medium is combined with the image containing the specific pattern and The image of ambient light is subtracted to eliminate the influence of ambient light on fingerprint recognition.

In a second aspect, an embodiment of the present application provides a calibration device for optical fingerprint recognition, including: a collection module, configured to display the screen display light spot and a specific pattern on the display module when the screen is respectively displayed according to the pressing area of the medium. After the light spot is displayed on the screen, a fingerprint image and a reference image are respectively collected by an optical fingerprint sensor, where the fingerprint image is an image of a fingerprint containing the medium; and after the display module displays the specific pattern, the optical fingerprint sensor The collection of the reference image is an image containing the specific pattern; a detection module is configured to perform a measurement on the screen according to the intensity information of the specific pattern in the image containing the specific pattern in the reference image collected by the collection module Detecting the intensity of the displayed light, and detecting the relative displacement of the optical fingerprint sensor and the screen according to the position information of the specific pattern in the reference image containing the specific pattern collected by the acquisition module; a calibration module, It is used to calibrate the fingerprint image including the fingerprint of the medium according to the intensity of the light displayed on the screen and the relative displacement obtained by the detection module.

In one of the possible implementation manners, the device further includes a display control module, specifically configured to control the screen to display the screen display spot and the specific pattern according to the pressing area of the medium on the screen.

In one possible implementation manner, the specific pattern is a pattern composed of lines with a predetermined width and a predetermined figure, and the color of the specific pattern is any color different from the background color of the screen.

In one possible implementation manner, the detection module is specifically configured to detect the intensity of the light displayed on the screen according to the intensity information of the line pattern of the predetermined width in the reference image, and according to the With reference to the position information of the predetermined graphic pattern in the image, the relative displacement of the optical fingerprint sensor and the screen is detected.

In one of the possible implementation manners, the colors of predetermined graphics in different positions in the specific pattern are different; the detection module is also used to collect the specific pattern containing the specific pattern through the optical fingerprint sensor in the collection module. After referring to the image, the color of the medium is determined according to the reflectance of the medium to the light of different colors of the predetermined pattern, so as to perform anti-counterfeiting detection on the medium.

In one possible implementation manner, the specific pattern is a pattern composed of lines of a predetermined width, or the specific pattern is a blank pattern, and the color of the specific pattern is any color different from the background color of the screen; The display control module is specifically configured to control the specific pattern to be displayed on the screen first, and then superimpose and display the specific pattern and the screen display spot.

In one of the possible implementation manners, the collection module is further configured to collect a frame of an image containing the specific pattern and ambient light through the optical fingerprint sensor after the display control module controls to display the specific pattern After the display control module superimposes the display of the specific pattern and the screen display spot, the optical fingerprint sensor collects a frame of images containing the fingerprint of the medium and the ambient light; the calibration module is also used to The image containing the fingerprint of the medium and the ambient light is subtracted from the image containing the specific pattern and the ambient light, so as to eliminate the influence of the ambient light on fingerprint recognition.

In a third aspect, an embodiment of the present application provides an electronic device including a memory, a processor, and a computer program stored on the memory and capable of running on the processor. When the processor executes the computer program, Implement the method described above.

In a fourth aspect, an embodiment of the present application provides a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the method described above is implemented.

In the above technical solution, when the screen displays the screen display spot and the specific pattern according to the pressing area of the medium, the fingerprint image and the reference image are respectively collected by the optical fingerprint sensor, wherein the fingerprint image is an image containing the fingerprint of the medium The reference image is an image containing the specific pattern. Then, the intensity of the light displayed on the screen is detected according to the intensity information of the specific pattern in the reference image, and the optical fingerprint sensor and the screen are detected according to the position information of the specific pattern in the reference image. The relative displacement. Finally, the fingerprint image is calibrated according to the detected intensity of the light displayed on the screen and the relative displacement, so that the intensity of the light displayed on the screen can be accurately detected during the application process, which can be applied to screen light. Strong, violent or fast-changing scenes have broader application scenarios, and can detect the relative displacement between the optical fingerprint sensor and the screen, which improves the fingerprint recognition performance in the scene where the relative position of the screen and the optical fingerprint sensor changes rapidly.

【Explanation of drawings】

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work.

FIG. 1 is a schematic diagram of the implementation scheme of optical fingerprint based on AMOLED hard screen of this application;

2 is a schematic diagram of an embodiment of a light spot displayed on the screen in the calibration method of optical fingerprint recognition according to the present application;

3 is a schematic diagram of light leakage and medium light under the light spot displayed on the screen in the calibration method for optical fingerprint recognition according to the application;

4 is a flowchart of an embodiment of a calibration method for optical fingerprint recognition according to this application;

5 is a flowchart of another embodiment of a calibration method for optical fingerprint recognition according to this application;

6 is a schematic diagram of a screen with a specific pattern in the calibration method for optical fingerprint recognition according to this application;

7 is a schematic diagram of light leakage and medium light when a specific pattern is superimposed and displayed in a screen display spot in the calibration method of optical fingerprint recognition according to the application;

FIG. 8(a) is a schematic diagram of an embodiment of light leakage received by the optical fingerprint sensor in the calibration method for optical fingerprint recognition of this application;

FIG. 8(b) is a schematic diagram of an embodiment of the medium light received by the optical fingerprint Sensor in the calibration method for optical fingerprint recognition of this application;

FIG. 9 is a schematic diagram of an embodiment of a specific pattern in the calibration method for optical fingerprint recognition of this application;

10 is a schematic diagram of light leakage and medium light when the screen displays a specific pattern in the calibration method of optical fingerprint recognition according to the present application;

FIG. 11(a) is a schematic diagram of another embodiment of the light leakage received by the optical fingerprint Sensor in the calibration method of optical fingerprint recognition in this application;

FIG. 11(b) is a schematic diagram of another embodiment of the medium light received by the optical fingerprint Sensor in the calibration method of optical fingerprint recognition in this application;

FIG. 12 is a schematic diagram of another embodiment of a specific pattern in the calibration method of optical fingerprint recognition according to this application;

FIG. 13 is a schematic diagram of ambient light in the calibration method of optical fingerprint recognition according to this application;

FIG. 14 is a schematic diagram of an embodiment of using a specific pattern to eliminate ambient light interference in the calibration method for optical fingerprint recognition of this application;

15 is a schematic diagram of another embodiment of using a specific pattern to eliminate ambient light interference in the calibration method of optical fingerprint recognition according to this application;

16 is a schematic structural diagram of an embodiment of a calibration device for optical fingerprint recognition in this application;

FIG. 17 is a schematic structural diagram of an embodiment of an electronic device of this application.

【Detailed ways】

In order to better understand the technical solutions of the present application, the following describes the embodiments of the present application in detail with reference to the accompanying drawings.

It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

The embodiment of this application proposes a calibration method for optical fingerprint recognition, which can rely on a small amount of prior information to accurately detect changes in the intensity of the light displayed on the screen during the application process, which can be applied to situations where the light intensity of the screen changes drastically or rapidly. Scenarios, with broader application scenarios. At the same time, the above-mentioned optical fingerprint recognition calibration method can also detect the relative displacement of the optical fingerprint sensor and the screen on the XY axis, which improves the fingerprint recognition performance in a scene where the relative position of the screen and the optical fingerprint sensor changes rapidly. In addition, some of the embodiments in this application have the functions of anti-counterfeiting and anti-interference from ambient light.

Figure 1 is a schematic diagram of an application based on an Active Matrix Organic Light Emitting Diode (Active Matrix Organic Light Emitting Diode; hereinafter abbreviated as: AMOLED) optical fingerprint implementation solution.

The embodiments of this application take the AMOLED hard screen as an example to illustrate the realization of the optical fingerprint under the screen. Other types of organic light-emitting diodes (Organic Light-Emitting Diode; hereinafter referred to as OLED)/Liquid Crystal Display (hereinafter referred to as: LCD) The implementation of the screen is consistent or similar to it, and will not be repeated here. A brief stack of AMOLED hard screens is shown in Figure 1. Various organic materials are distilled on the substrate glass to form display pixels, and then sealed with sealing glass. The substrate glass, sealing glass and the laminate between them are implemented with the display drive circuit. Display function. The Touch Panel (TP) layer above the sealing glass cooperates with the touch drive circuit to realize the touch function. The TP layer can be etched into various patterns. In addition, the OLED screen generally adds a layer Circular polarizer to suppress the reflection of the display screen to the ambient light and achieve higher display contrast, and finally fit the cover glass to form a complete display screen. The optical fingerprint sensor is placed or attached to the bottom of the substrate glass, and the under-screen optical fingerprint can be implemented locally in the display area of the display screen, or in full screen.

In the actual application of the user, the user presses the finger on the screen surface of the electronic device. The electronic device detects the user's pressing operation and recognizes the user's pressing area. Then the electronic device lights up a fixed size (or adaptively) on the screen according to the user's pressing area. Size), that is, the screen display spot. The screen display spot can be in the user's pressing area or cover the user's pressing area, and the screen display spot can be any color such as green, cyan, or white. The screen display spot can be a circle. A shape, an ellipse, or an irregular polygon automatically generated according to the user's pressing area, etc., as shown in FIG. 2, which is a schematic diagram of an embodiment of a screen display light spot in the calibration method for optical fingerprint recognition of this application. After the light intensity of the light spot displayed on the screen is stabilized, the fingerprint image of the user is collected through the optical fingerprint sensor, and then the electronic device performs the operation of calibrating, preprocessing, feature point extraction and/or feature point matching on the fingerprint image, and then the fingerprint matching is given To conclude or not, complete a complete fingerprint identification.

The light received by the optical fingerprint sensor is mainly composed of two parts: light leakage (represented by PL) and medium light (represented by PM), as shown in Figure 3, which is the light spot on the screen in the calibration method of optical fingerprint recognition in this application Schematic diagram of light leakage and medium light below. Specifically, the illuminated screen display spot emits screen light upward, but there is also a part of downward light leakage, and the screen light has reflected light at each interface of the laminated layers inside the screen, and these two parts are combined into the leakage light PL. The reflected light of the screen light passing through a medium (such as a finger) after exiting the screen is called medium light for short.

The optical fingerprint recognition calibration method provided by the embodiments of the present application realizes detection of the intensity of the light displayed on the screen and the relative displacement between the optical fingerprint Sensor and the above-mentioned screen by displaying the screen display light spot and a specific pattern on the screen.

FIG. 4 is a flowchart of an embodiment of a calibration method for optical fingerprint recognition according to this application. As shown in FIG. 4, the above-mentioned calibration method for optical fingerprint recognition may include:

Step 401: When the screen displays the screen display light spot and the specific pattern according to the pressing area of the medium, the fingerprint image and the reference image are respectively collected by the optical fingerprint sensor, wherein the fingerprint image is an image containing the fingerprint of the medium, so The reference image is an image containing the specific pattern.

Step 402: Detect the intensity of the light displayed on the screen according to the intensity information of the specific pattern in the reference image, and detect the optical fingerprint sensor and the optical fingerprint sensor according to the position information of the specific pattern in the reference image. The relative displacement of the screen.

Step 403: Calibrate the fingerprint image according to the detected intensity of the light displayed on the screen and the relative displacement.

In this embodiment, the above-mentioned medium may be a user's finger, and of course, it may also be other objects that can complete the pressing operation on the screen. This embodiment does not limit the above-mentioned medium.

After detecting the intensity of the light displayed on the screen and the relative displacement, the image of the fingerprint containing the medium can be calibrated according to the intensity of the light displayed on the screen and the relative displacement. After processing, feature point extraction and/or feature point matching, a conclusion is given whether the fingerprint matches or not, and a complete fingerprint identification is completed.

In the above-mentioned calibration method for optical fingerprint recognition, when the screen displays the screen display light spot and the specific pattern according to the pressing area of the medium, the fingerprint image and the reference image are respectively collected by the optical fingerprint sensor, wherein the fingerprint image contains the medium The fingerprint image of the reference image is an image containing the specific pattern. Then, the intensity of the light displayed on the screen is detected according to the intensity information of the specific pattern in the reference image, and the optical fingerprint sensor and the screen are detected according to the position information of the specific pattern in the reference image. The relative displacement. Finally, the fingerprint image is calibrated according to the detected intensity of the light displayed on the screen and the relative displacement, so that the intensity of the light displayed on the screen can be accurately detected during the application process, which can be applied to screen light. Strong, violent or fast-changing scenes have broader application scenarios, and can detect the relative displacement between the optical fingerprint sensor and the screen, which improves the fingerprint recognition performance in the scene where the relative position of the screen and the optical fingerprint sensor changes rapidly.

FIG. 5 is a flowchart of another embodiment of a calibration method for optical fingerprint recognition according to this application. As shown in FIG. 5, based on the embodiment shown in FIG. 4 of this application, the method further includes the following steps:

Step 500: Control the screen to display the screen display spot and the specific pattern according to the pressing area of the medium on the screen.

In an implementation of this embodiment, the screen display light spot and the specific pattern are simultaneously displayed on the screen. Wherein, the screen display light spot is displayed at the position of the pressing area, and the specific pattern is superimposed and displayed in the screen display light spot; or the specific pattern and the screen display light spot are respectively displayed at different positions in the pressing area.

In this embodiment, the specific pattern is superimposed and displayed in the screen display light spot, and the above-mentioned specific pattern is a pattern composed of lines with a predetermined width, and the color of the above-mentioned specific pattern is any color different from the color of the screen display light spot.

The specific pattern and the screen display spot are respectively displayed at different positions in the pressing area, and the specific pattern is a pattern composed of lines with a predetermined width, and the color of the specific pattern is any color different from the background color of the screen.

The above-mentioned predetermined width can be set according to system performance and/or implementation requirements during specific implementation. This embodiment does not limit the size of the above-mentioned predetermined width. For example, the above-mentioned predetermined width may be 1 to 1 of screen display pixels. 3 pixels (Pixel).

Specifically, taking a circular screen display light spot as an example, some embodiments of a specific pattern may be shown in FIG. 6, which is a schematic diagram of a screen display light spot with a specific pattern in the calibration method of optical fingerprint recognition in this application. In this embodiment, the above-mentioned specific patterns can be regular horizontal lines, vertical lines, diagonal lines, square grids, diamond grids, triangular grids, circular rings or concentric rings, etc. The line colors of the specific patterns can be set as The screen displays any color with different colors of the light spot, and the line width of the specific pattern is a predetermined width. The predetermined width is required to be as narrow as possible while ensuring the detection accuracy (detection of the intensity of the light displayed on the screen and relative displacement detection). 1～3Pixel of display pixels is better.

When a specific pattern is superimposed and displayed in the screen display spot, the light leakage PL received by the optical fingerprint sensor contains the information of the above-mentioned specific pattern, and because the reflection of light by a medium such as a finger or a test head is similar to diffuse reflection, and the pattern width is narrow, The pattern information is basically obscured, so there is basically no information of the above-mentioned specific pattern in the medium light PM received by the optical fingerprint sensor. As shown in Fig. 7, Fig. 7 shows the specific pattern superimposed and displayed on the screen in the calibration method of optical fingerprint recognition in this application. Shows the schematic diagram of light leakage and medium light in the light spot.

Taking a specific pattern as a pattern composed of periodic vertical lines as an example, the above specific pattern information only exists in the light leakage PL, as shown in Figure 8(a), and the intensity information of the above specific pattern is greater than the intensity of the light displayed on the screen. The linear relationship of the zero point, Fig. 8(a) is a schematic diagram of an embodiment of the light leakage received by the optical fingerprint sensor in the calibration method of optical fingerprint recognition of this application; Fig. 8(b) is the optical fingerprint of the calibration method of optical fingerprint recognition of this application A schematic diagram of an embodiment of the medium light received by the Sensor, as shown in Fig. 8(b), the medium light PM basically does not contain the above-mentioned specific pattern information. Obviously, it can be known that the above-mentioned specific pattern information does not exist in the external ambient light. That is to say, the intensity information and position information of the above-mentioned specific pattern are basically not affected by the medium light and external ambient light, so the intensity of the light displayed on the screen can be detected by the intensity information of the above-mentioned specific pattern, and the position of the above-mentioned specific pattern Information to detect the relative displacement of the optical fingerprint Sensor and the screen.

Specifically, the concave zigzag pattern in FIG. 8(a) is the information of the specific pattern in the light leakage, and the depth a of the concave zigzag pattern is the intensity information of the above-mentioned specific pattern. According to the light leakage, the specific pattern part is not included. The difference between the intensity b of the light and the intensity information a of the aforementioned specific pattern can be detected to obtain the intensity of the light displayed on the screen.

In another implementation manner of this embodiment, the screen display spot and the specific pattern are displayed on the screen sequentially in a time-sharing manner.

In this embodiment, the medium is pressed on the screen, and after the display screen displays the light spot, the optical fingerprint sensor collects an image of the fingerprint containing the medium, and the optical fingerprint sensor also displays a specific pattern before or after the image of the fingerprint containing the medium is collected.

For example, the above-mentioned specific pattern is a pattern composed of lines with a predetermined width, and the color of the above-mentioned specific pattern is any color different from the background color of the above-mentioned screen.

For another example, the specific pattern is a pattern composed of lines with a predetermined width and a predetermined pattern, and the color of the specific pattern is any color different from the background color of the screen.

The above-mentioned predetermined width can be set according to system performance and/or implementation requirements during specific implementation. This embodiment does not limit the size of the above-mentioned predetermined width. For example, the above-mentioned predetermined width may be 1 to 1 of screen display pixels. 3Pixel.

Taking a circular screen display light spot as an example, some embodiments of the specific pattern may be shown in FIG. 9. FIG. 9 is a schematic diagram of an embodiment of the specific pattern in the calibration method of optical fingerprint recognition in this application, and the color of the specific pattern may be Any color different from the background color of the above-mentioned screen, the above-mentioned specific pattern can be regular horizontal lines, vertical lines, diagonal lines, square grids, diamond grids, triangular grids, rings or concentric rings with a predetermined width, etc. The pattern composed of lines, the line width of the above-mentioned specific pattern is a predetermined width, and the above-mentioned predetermined width is required to be as narrow as possible while ensuring the detection accuracy (detection of the light intensity displayed on the screen, relative displacement detection), and 1 of the pixels displayed on the screen ~3Pixel is better.

However, if the pattern composed of lines with a predetermined width is not accurate enough to detect the relative displacement between the optical fingerprint Sensor and the screen, it can be estimated by adding other predetermined patterns with a wider size, as shown in Figure 9, for example, when the line is composed of predetermined widths Add three circles, four circles, or three squares to the pattern of. This embodiment does not limit the number and size of the predetermined patterns. The sizes between the predetermined patterns are not required to be equal, and you can only use the predetermined patterns. The pattern composed of graphics (circular or square, etc.) independently detects the relative displacement of the optical fingerprint Sensor and the screen.

When the specific pattern is a pattern composed of lines with a predetermined width, the information of the specific pattern is present in the light leakage PL received by the optical fingerprint sensor, and the reflection of light by a medium such as a finger or a test head is similar to diffuse reflection, and the specific pattern is The line width is narrow, so the information of the above-mentioned specific pattern is basically obscured, so there is basically no information of the above-mentioned specific pattern in the medium light PM received by the optical fingerprint Sensor, as shown in FIG. 10, which is the optical fingerprint recognition of this application. Schematic diagram of light leakage and medium light when the screen displays a specific pattern in the calibration method.

Taking a specific pattern as a pattern composed of periodic vertical lines as an example, as shown in Figure 11(a), the information of the specific pattern only exists in the light leakage PL, and the intensity information of the specific pattern and the intensity of the light displayed on the screen are The linear relationship of the zero-crossing point, FIG. 11(a) is a schematic diagram of another embodiment of the light leakage received by the optical fingerprint sensor in the calibration method of optical fingerprint recognition of this application; FIG. 11(b) is the calibration method of optical fingerprint recognition of this application A schematic diagram of another embodiment of the medium light received by the optical fingerprint Sensor, as shown in FIG. 11(b), the medium light PM basically does not have the information of the above-mentioned specific pattern, and it is obvious that there is no such specific pattern in the external ambient light. Information, that is, the intensity information and position information of the above-mentioned specific pattern will not be affected by the medium light and external ambient light. Therefore, the intensity information of the above-mentioned specific pattern can be used to detect the intensity of the light displayed on the screen. The position information of the pattern is used to detect the relative displacement of the optical fingerprint Sensor and the screen.

Specifically, the convex zigzag pattern in FIG. 11(a) is the information of the specific pattern in the light leakage, and the height indicated by c in FIG. 11(a) is the intensity information of the above-mentioned specific pattern. Intensity information can detect the intensity of the light displayed on the screen.

When the above-mentioned specific pattern is a pattern composed of lines with a predetermined width and a predetermined pattern, the light leakage PL received by the optical fingerprint Sensor contains the information of the above-mentioned specific pattern, and since the reflection of light by a medium such as a finger or a test head is similar to diffuse reflection, the predetermined Because the width of the line is narrow, the pattern information of the line of the predetermined width is basically blurred, and the pattern of the predetermined pattern is still retained due to the larger size, so there are basically only patterns of the predetermined pattern in the medium light PM received by the optical fingerprint sensor Information, there is no pattern information of a line of a predetermined width. At this time, the intensity information of the pattern of the predetermined width of the line can be used to detect the intensity of the light displayed on the screen, and the position information of the pattern of the predetermined figure can be used to detect the relative displacement of the optical fingerprint Sensor and the screen.

Therefore, in the embodiment shown in FIG. 4 of the present application, step 402 may be: detecting the intensity of the light displayed on the screen according to the intensity information of the line pattern of the predetermined width in the reference image, according to the With reference to the position information of the predetermined graphic pattern in the image, the relative displacement of the optical fingerprint sensor and the screen is detected.

Further, when the above-mentioned specific pattern is a pattern composed of lines with a predetermined width and a predetermined pattern, the colors of the predetermined patterns at different positions in the above-mentioned specific pattern are different; at this time, the calibration method for optical fingerprint recognition provided in the embodiment of the present application is also It may include: after the image containing the specific pattern is collected by the optical fingerprint sensor, the color of the medium is determined according to the reflectivity of the medium to the light of different colors of the predetermined pattern, so as to perform anti-counterfeiting detection on the medium.

Specifically, the predetermined patterns of the above-mentioned specific patterns at different positions can be set to different colors, preferably red, green and blue can be used, as shown in FIG. 12, which is an example of the specific pattern in the calibration method for optical fingerprint recognition in this application. A schematic diagram of another embodiment. In FIG. 12, the shades of squares, diagonal lines and small dots are used to represent the three colors of red, green and blue, respectively. The color of the medium can be approximately calculated based on the reflectance of the medium, such as a finger or a fake fingerprint, to the three colors of red, green and blue, and the anti-counterfeiting detection can be performed according to the color of the medium.

In the foregoing embodiment where the screen display spot and the specific pattern are displayed on the screen in time-division, the specific pattern may be a pattern composed of lines with a predetermined width, or the specific pattern may be a blank pattern. The color of the pattern is any color different from the background color of the above-mentioned screen; wherein, the specific pattern is first displayed on the screen, and then the specific pattern and the screen display light spot are superimposed and displayed.

Further, according to the pressing area of the medium on the screen, first displaying a specific pattern, and then superimposing the display of the specific pattern and the screen display spot, it may also include: after the specific pattern is displayed, collecting a frame through the optical fingerprint Sensor includes The above-mentioned specific pattern and the image of the ambient light; after the above-mentioned specific pattern and the screen display light spot are superimposed and displayed, a frame containing the fingerprint of the above-mentioned medium and the ambient light image is collected by the optical fingerprint sensor; the fingerprint and the ambient light containing the above-mentioned medium are collected Perform a subtraction operation between the image and the image containing the specific pattern and ambient light to eliminate the influence of ambient light on fingerprint recognition.

Specifically, the optical fingerprint recognition process is easily interfered by ambient light, as shown in FIG. 13, which is a schematic diagram of the ambient light in the calibration method of optical fingerprint recognition in this application. After displaying the above-mentioned specific pattern, the optical fingerprint sensor collects a frame of image containing the above-mentioned specific pattern and ambient light; after superimposing the above-mentioned specific pattern and the screen display light spot, the optical fingerprint Sensor collects a frame of fingerprints and a frame containing the above-mentioned medium For the image of ambient light, subtracting the two frames of images can effectively avoid the impact of ambient light on fingerprint recognition, as shown in Figure 14 and Figure 15. Figure 14 is the application of the optical fingerprint recognition calibration method using a specific pattern to eliminate ambient light interference A schematic diagram of an embodiment. FIG. 15 is a schematic diagram of another embodiment of using a specific pattern to eliminate ambient light interference in the calibration method for optical fingerprint recognition of this application. In Figures 14 and 15, the left is the image containing the specific pattern and ambient light collected after the specific pattern is displayed, and the right is the image of the fingerprint and ambient light collected after the above-mentioned specific pattern and the screen display spot are superimposed and displayed. image. In Figures 14 and 15, the color of the specific pattern can be any color, but it is preferable to use a completely black background, and the specific pattern can only use a pattern composed of lines with a predetermined width (see Figure 15) or a blank pattern (see Figure 14) .

16 is a schematic structural diagram of an embodiment of a calibration device for optical fingerprint recognition in this application. The calibration device for optical fingerprint recognition in this embodiment can implement the calibration method for optical fingerprint recognition provided in the embodiment of this application. As shown in FIG. 16, the aforementioned calibration device 16 for optical fingerprint recognition may include: an acquisition module 1601, a detection module 1602, a calibration module 1603, and a display control module 1604.

The collection module 1601 is used to collect a fingerprint image and a reference image through an optical fingerprint sensor when the screen displays the screen display light spot and a specific pattern according to the pressing area of the medium, wherein the fingerprint image is a fingerprint containing the medium The reference image is an image containing the specific pattern. The detection module 1602 is configured to detect the intensity of the light displayed on the screen according to the intensity information of the specific pattern in the reference image, and detect the intensity of the light displayed on the screen according to the position information of the specific pattern in the reference image. The relative displacement of the optical fingerprint sensor and the screen. The calibration module 1603 is configured to calibrate the fingerprint image according to the intensity of the light displayed on the screen and the relative displacement obtained by the detection module 1602. The display control module 1604 is configured to control the screen to display the screen display light spot and the specific pattern according to the pressing area of the medium on the screen.

In this embodiment, after the detection module 1602 detects and obtains the intensity of the light displayed on the screen and the above relative displacement, the calibration module 1603 can perform a measurement of the fingerprint containing the medium according to the intensity of the light displayed on the screen and the relative displacement. After calibrating, perform preprocessing, feature point extraction and/or feature point matching, and then give a conclusion on whether the fingerprint matches or not, and complete a complete fingerprint identification.

In one embodiment, the screen display spot and the specific pattern are displayed on the screen at the same time. Wherein, the screen display light spot is displayed at the position where the pressing area is located, and the specific pattern is superimposed and displayed in the screen display light spot; or the specific pattern and the screen display light spot are respectively displayed at different positions in the pressing area.

In this embodiment, the specific pattern is superimposed and displayed in the screen display spot, and the specific pattern is a pattern composed of lines with a predetermined width, and the color of the specific pattern is different from the color of the screen display spot Of any color.

The specific pattern and the screen display spot are respectively displayed at different positions in the pressing area, and the specific pattern is a pattern composed of lines with a predetermined width, and the color of the specific pattern is the same as that of the background of the screen. Any color with different colors.

Specifically, taking the circular screen display light spot as an example, some embodiments of the specific pattern may be as shown in FIG. 6. In this embodiment, the above-mentioned specific patterns can be regular horizontal lines, vertical lines, diagonal lines, square grids, diamond grids, triangular grids, circular rings or concentric rings, etc. The line colors of the specific patterns can be set as The screen displays any color with different colors of the light spot, and the line width of the specific pattern is a predetermined width. The predetermined width is required to be as narrow as possible while ensuring the detection accuracy (detection of the intensity of the light displayed on the screen and relative displacement detection). 1～3Pixel of display pixels is better.

When a specific pattern is superimposed and displayed in the screen display spot, the light leakage PL received by the optical fingerprint sensor contains the information of the above-mentioned specific pattern, and because the reflection of light by a medium such as a finger or a test head is similar to diffuse reflection, and the pattern width is narrow, The pattern information is basically obscured, so there is basically no information of the above-mentioned specific pattern in the medium light PM received by the optical fingerprint Sensor, as shown in FIG. 7.

Taking a specific pattern as a pattern composed of periodic vertical lines as an example, the above specific pattern information only exists in the light leakage PL, as shown in Figure 8(a), and the intensity information of the above specific pattern is greater than the intensity of the light displayed on the screen. The linear relationship of the zero point; as shown in Figure 8(b), there is basically no information about the above-mentioned specific pattern in the medium light PM. Obviously, there is no information about the above-mentioned specific pattern in the external ambient light, that is, the information about the above-mentioned specific pattern The intensity information and position information are basically not affected by medium light and external ambient light. Therefore, the detection module 1704 can detect the intensity of the light displayed on the screen through the intensity information of the above-mentioned specific pattern, and detect the optical intensity through the position information of the above-mentioned specific pattern. The relative displacement of the fingerprint Sensor and the screen.

In another embodiment, the screen display spot and the specific pattern are sequentially displayed on the screen in a time-sharing manner.

In this embodiment, the medium is pressed on the screen, and after the light spot is displayed on the display screen, the optical fingerprint Sensor collects the image of the fingerprint containing the medium. Before or after the optical fingerprint Sensor collects the image of the fingerprint containing the medium, the display control module 1604 displays a specific pattern.

In an implementation of this embodiment, the above-mentioned specific pattern is a pattern composed of lines of a predetermined width, and the color of the above-mentioned specific pattern is any color different from the background color of the above-mentioned screen.

In another implementation of this embodiment, the above-mentioned specific pattern is a pattern composed of lines with a predetermined width and a predetermined figure, and the color of the above-mentioned specific pattern is any color different from the background color of the above-mentioned screen.

Taking a circular screen display light spot as an example, some embodiments of the specific pattern may be as shown in FIG. 9. The color of the specific pattern may be any color different from the background color of the screen, and the specific pattern may be regular horizontal lines, Vertical lines, diagonal lines, square grids, diamond grids, triangular grids, circular rings, or concentric rings, etc., are patterns composed of lines with a predetermined width. The line width of the above specific pattern is a predetermined width. The predetermined width is required to be guaranteed In the case of detection accuracy (detection of the intensity of the light displayed on the screen, relative displacement detection), it is as narrow as possible, and preferably 1 to 3 pixels of the screen display pixels.

When the specific pattern is a pattern composed of lines with a predetermined width, the information of the specific pattern is present in the light leakage PL received by the optical fingerprint sensor, and the reflection of light by a medium such as a finger or a test head is similar to diffuse reflection, and the specific pattern is The line width is relatively narrow, so the information of the above-mentioned specific pattern is basically blurred, so there is basically no information of the above-mentioned specific pattern in the medium light PM received by the optical fingerprint sensor, as shown in FIG. 10.

Taking a specific pattern as a pattern composed of periodic vertical lines as an example, as shown in Figure 11(a), the information of the specific pattern only exists in the light leakage PL, and the intensity information of the specific pattern and the intensity of the light displayed on the screen are The linear relationship of the zero crossing point; as shown in Figure 11(b), there is basically no information about the above-mentioned specific pattern in the medium light PM. Obviously, there is no information about the above-mentioned specific pattern in the external ambient light, that is, the above-mentioned specific pattern The intensity information and position information of the above will not be affected by the medium light and external ambient light. Therefore, the intensity information of the specific pattern can be used to detect the intensity of the light displayed on the screen, and the position information of the specific pattern can be used to detect the optical fingerprint Sensor The relative displacement from the screen.

When the above-mentioned specific pattern is a pattern composed of lines with a predetermined width and a predetermined pattern, the light leakage PL received by the optical fingerprint Sensor contains the information of the above-mentioned specific pattern, and since the reflection of light by a medium such as a finger or a test head is similar to diffuse reflection, the predetermined Because the width of the line is narrow, the pattern information of the line of the predetermined width is basically blurred, and the pattern of the predetermined pattern is still retained due to the larger size, so there are basically only patterns of the predetermined pattern in the medium light PM received by the optical fingerprint sensor Information, there is no pattern information of a line of a predetermined width. At this time, the intensity information of the pattern of the predetermined width of the line can be used to detect the intensity of the light displayed on the screen, and the position information of the pattern of the predetermined pattern can be used to detect the relative displacement of the optical fingerprint Sensor and the screen.

Therefore, the detection module 1602 is specifically configured to detect the intensity of the light displayed on the screen according to the intensity information of the line pattern of the predetermined width in the reference image, and according to the predetermined pattern in the reference image The position information of the pattern detects the relative displacement of the optical fingerprint sensor and the screen.

Further, when the above-mentioned specific pattern is a pattern composed of lines with a predetermined width and a predetermined pattern, the colors of the predetermined patterns at different positions in the above-mentioned specific pattern are different; the detection module 1602 is also used to pass the optical signal in the collection module 1601 After the fingerprint sensor collects the reference image, the color of the medium is determined according to the reflectance of the light of different colors of the predetermined pattern by the medium, so as to perform anti-counterfeiting detection on the medium.

Specifically, the predetermined patterns of the above-mentioned specific patterns at different positions can be set to different colors, and preferably three colors of red, green and blue can be used, as shown in FIG. 12. In Fig. 12, the shades of squares, diagonal dashes and small dots are used to represent the three colors of red, green and blue. According to the reflectivity of the medium, such as a finger or a fake fingerprint, to the red, green and blue light, the detection module 1602 can approximate the color of the medium, and then can perform anti-counterfeiting detection according to the color of the medium.

In still another implementation of this embodiment, the above-mentioned specific pattern may be a pattern composed of lines with a predetermined width, or the above-mentioned specific pattern is a blank pattern, and the color of the above-mentioned specific pattern is any color different from the background color of the above-mentioned screen; The display control module 1604 is specifically configured to control the specific pattern to be displayed on the screen first, and then superimpose and display the specific pattern and the screen display spot.

Further, the collection module 1601 is also configured to collect an image containing the above-mentioned specific pattern and ambient light through the optical fingerprint sensor after the display control module 1604 displays the above-mentioned specific pattern. After the display control module 1604 superimposes and displays the above-mentioned specific pattern and the screen display light spot, collect a frame of image containing the fingerprint of the above-mentioned medium and the ambient light through the optical fingerprint sensor;

The calibration module 1603 is also used to subtract the image containing the fingerprint and ambient light of the aforementioned medium with the image containing the aforementioned specific pattern and ambient light, so as to eliminate the influence of ambient light on fingerprint recognition.

Specifically, it is easy to be interfered by ambient light in the process of optical fingerprint recognition, as shown in Figure 13. After the display control module 1604 displays the above-mentioned specific pattern, the collection module 1601 uses the optical fingerprint Sensor to collect an image containing the above-mentioned specific pattern and ambient light; after the display control module 1604 superimposes and displays the above-mentioned specific pattern and the screen display light spot, the collection module 1601 collects The module 1601 uses the optical fingerprint sensor to collect a frame of images containing the fingerprint of the aforementioned medium and ambient light. The calibration module 1705 subtracts the two frames of images to effectively avoid the influence of ambient light on fingerprint recognition, as shown in FIGS. 14 and 15. In Figures 14 and 15, the left side is the image containing the specific pattern and ambient light collected by the collection module 1601 after the specific pattern is displayed, and the right side is the image after the above-mentioned specific pattern and the screen display spot are superimposed and displayed, and the collection module 1601 collects the image containing the above The fingerprint of the medium and the image of the ambient light. In Figures 14 and 15, the color of the specific pattern can be any color, but it is preferable to use a completely black background, and the specific pattern can only use a pattern composed of lines with a predetermined width (see Figure 15) or a blank pattern (see Figure 14) .

FIG. 17 is a schematic structural diagram of an embodiment of an electronic device of this application. The electronic device may include a memory, a processor, and a computer program stored on the memory and capable of running on the processor. When the processor executes the computer program, The optical fingerprint identification calibration method provided in the embodiments of the present application can be implemented.

Fig. 17 shows a block diagram of an exemplary electronic device suitable for implementing the embodiments of the present application. The electronic device shown in FIG. 17 is only an example, and should not bring any limitation to the function and scope of use of the embodiments of the present application.

As shown in Figure 17, the electronic device is represented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: one or more processors 410, a memory 430, and a communication bus 440 connecting different system components (including the memory 430 and the processing unit 410).

The communication bus 440 represents one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any bus structure among multiple bus structures. For example, these architectures include but are not limited to industry standard architecture (Industry Standard Architecture; hereinafter referred to as: ISA) bus, Micro Channel Architecture (hereinafter referred to as: MAC) bus, enhanced ISA bus, video electronics Standards Association (Video Electronics Standards Association; hereinafter referred to as VESA) local bus and Peripheral Component Interconnection (hereinafter referred to as PCI) bus.

Electronic devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by electronic devices, including volatile and non-volatile media, removable and non-removable media.

The memory 430 may include a computer system readable medium in the form of a volatile memory, such as random access memory (Random Access Memory; hereinafter referred to as RAM) and/or cache memory. The electronic device may further include other removable/non-removable, volatile/non-volatile computer system storage media. Although not shown in FIG. 18, a disk drive for reading and writing to a removable non-volatile disk (such as a "floppy disk") and a removable non-volatile optical disk (such as a compact disk read-only memory) can be provided. Disc Read Only Memory; hereinafter referred to as CD-ROM), Digital Video Disc Read Only Memory (hereinafter referred to as DVD-ROM) or other optical media) read and write optical disc drives. In these cases, each drive may be connected to the communication bus 440 through one or more data medium interfaces. The memory 430 may include at least one program product, and the program product has a set of (for example, at least one) program modules, which are configured to perform the functions of the embodiments of the present application.

A program/utility tool having a set of (at least one) program modules may be stored in the memory 430. Such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data Each of these examples or some combination may include the implementation of a network environment. The program module usually executes the functions and/or methods in the embodiments described in this application.

The electronic device can also communicate with one or more external devices (such as keyboards, pointing devices, displays, etc.), and can also communicate with one or more devices that enable the user to interact with the electronic device, and/or communicate with the electronic device Any device (such as a network card, modem, etc.) that can communicate with one or more other computing devices. Such communication can be performed through the communication interface 420. In addition, the electronic device can also connect to one or more networks (such as local area network (Local Area Network; hereinafter referred to as: LAN), Wide Area Network (hereinafter referred to as WAN) and/or other networks through a network adapter (not shown in FIG. 18). Or a public network, such as the Internet, for communication, the above-mentioned network adapter may communicate with other modules of the electronic device through the communication bus 440. It should be understood that although not shown in FIG. 18, other hardware and/or software modules can be used in conjunction with electronic devices, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, and disk arrays (Redundant Arrays). of Independent Drives; hereinafter referred to as: RAID) systems, tape drives, and data backup storage systems.

The processor 410 executes various functional applications and data processing by running programs stored in the memory 430, for example, to implement the optical fingerprint recognition calibration method provided in the embodiments of the present application.

The embodiment of the present application also provides a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the optical fingerprint recognition calibration method provided in the embodiment of the present application can be implemented.

The aforementioned non-transitory computer-readable storage medium may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electric, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of computer-readable storage media (non-exhaustive list) include: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (Read Only Memory) ; Hereinafter referred to as: ROM), Erasable Programmable Read Only Memory; hereinafter referred to as EPROM) or flash memory, optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic memory Pieces, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system, apparatus, or device.

The computer-readable signal medium may include a data signal propagated in baseband or as a part of a carrier wave, and computer-readable program code is carried therein. This propagated data signal can take many forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the foregoing. The computer-readable signal medium may also be any computer-readable medium other than the computer-readable storage medium. The computer-readable medium may send, propagate, or transmit the program for use by or in combination with the instruction execution system, apparatus, or device .

The program code contained on the computer-readable medium can be transmitted by any suitable medium, including, but not limited to, wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

The computer program code used to perform the operations of the present application can be written in one or more programming languages or a combination thereof. The programming languages include object-oriented programming languages-such as Java, Smalltalk, C++, and also conventional Procedural programming language-such as "C" language or similar programming language. The program code can be executed entirely on the user's computer, partly on the user's computer, executed as an independent software package, partly on the user's computer and partly executed on a remote computer, or entirely executed on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any kind of network-including local area network (Local Area Network; hereinafter referred to as LAN) or Wide Area Network (hereinafter referred to as WAN), or Connect to an external computer (for example, use an Internet service provider to connect via the Internet).

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example , The structure, materials, or characteristics are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification without contradicting each other.

In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless specifically defined otherwise.

Any process or method description in the flowchart or described in other ways herein can be understood as a module, segment or part of code that includes one or more executable instructions for implementing custom logic functions or steps of the process , And the scope of the preferred embodiments of the present application includes additional implementations, which may not be in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. This should It is understood by those skilled in the art to which the embodiments of this application belong.

Depending on the context, the word "if" as used herein can be interpreted as "when" or "when" or "in response to determination" or "in response to detection". Similarly, depending on the context, the phrase "if determined" or "if detected (statement or event)" can be interpreted as "when determined" or "in response to determination" or "when detected (statement or event) )" or "in response to detection (statement or event)".

It should be noted that the terminals involved in the embodiments of this application may include, but are not limited to, personal computers (Personal Computer; hereinafter referred to as PC), Personal Digital Assistants (Personal Digital Assistant; hereinafter referred to as PDA), wireless handheld devices, and tablets Computer (Tablet Computer), mobile phone, MP3 player, MP4 player, etc.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined Or it can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

In addition, the functional units in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.

The above-mentioned integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The above-mentioned software functional unit is stored in a storage medium and includes several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (Processor) execute the method described in each embodiment of the present application Part of the steps. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as ROM), random access memory (Random Access Memory; hereinafter referred to as RAM), magnetic disks or optical disks, etc. A medium that can store program codes.

The above are only the preferred embodiments of this application and are not intended to limit this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in this application Within the scope of protection.

Claims

A calibration method for optical fingerprint recognition, characterized in that it comprises:

When the screen displays the screen display light spot and the specific pattern according to the pressing area of the medium, the fingerprint image and the reference image are respectively collected by the optical fingerprint sensor, wherein the fingerprint image is an image containing the fingerprint of the medium, and the reference image Is an image containing the specific pattern;

Detect the intensity of the light displayed on the screen according to the intensity information of the specific pattern in the reference image, and detect the relative position of the optical fingerprint sensor and the screen according to the position information of the specific pattern in the reference image Displacement

The fingerprint image is calibrated according to the detected intensity of the light displayed on the screen and the relative displacement.
The method according to claim 1, further comprising:

According to the pressing area of the medium on the screen, the screen is controlled to display the screen display spot and the specific pattern.
The method according to claim 2, wherein the screen display spot and the specific pattern are simultaneously displayed on the screen;

Wherein, the screen display light spot is displayed at the position of the pressing area, and the specific pattern is superimposed and displayed in the screen display light spot; or, the specific pattern and the screen display light spot are respectively displayed in the pressing area In different locations.
The method according to claim 3, wherein the specific pattern is superimposed and displayed in the screen display spot, and the specific pattern is a pattern composed of lines with a predetermined width, and the color of the specific pattern is and The screen displays any colors with different colors of light spots.
The method according to claim 3, wherein the specific pattern and the screen display spot are respectively displayed at different positions in the pressing area, and the specific pattern is a pattern composed of lines with a predetermined width, The color of the specific pattern is any color different from the background color of the screen.
The method according to claim 2, wherein the screen display light spot and the specific pattern are displayed on the screen successively in a time-sharing manner.
7. The method according to claim 6, wherein the specific pattern is a pattern composed of lines of a predetermined width, and the color of the specific pattern is any color different from the background color of the screen.
The method according to claim 6, wherein the specific pattern is a pattern composed of lines with a predetermined width and a predetermined figure, and the color of the specific pattern is any color different from the background color of the screen.
The method according to claim 8, wherein the detecting the intensity of the light displayed on the screen according to the intensity information of the specific pattern in the reference image, and detecting the intensity of the light displayed in the reference image according to the The position information of a specific pattern detecting the relative displacement of the optical fingerprint sensor and the screen includes:

Detect the intensity of the light displayed on the screen according to the intensity information of the line pattern of the predetermined width in the reference image, and detect the optical fingerprint according to the position information of the predetermined graphic pattern in the reference image The relative displacement of the sensor and the screen.
8. The method according to claim 8, characterized in that the colors of predetermined graphics in different positions in the specific pattern are different;

The method also includes:

After the reference image is collected by the optical fingerprint sensor, the color of the medium is determined according to the reflectance of the medium to the light of different colors of the predetermined pattern, so as to perform anti-counterfeiting detection on the medium.
The method according to claim 6, wherein the specific pattern is a pattern composed of lines with a predetermined width, or the specific pattern is a blank pattern, and the color of the specific pattern is different from the background color of the screen Any color of

Wherein, the specific pattern is first displayed on the screen, and then the specific pattern and the screen display spot are superimposed and displayed.
The method according to claim 11, further comprising:

After the specific pattern is displayed on the screen, collecting an image including the specific pattern and ambient light by the optical fingerprint sensor;

After superimposing and displaying the specific pattern and the screen display light spot, collecting a frame of image containing the fingerprint of the medium and the ambient light by the optical fingerprint sensor;

A subtraction operation is performed on the image containing the fingerprint of the medium and the ambient light and the image containing the specific pattern and the ambient light to eliminate the influence of the ambient light on fingerprint recognition.
A calibration device for optical fingerprint recognition, characterized in that it comprises:

The collection module is used to collect a fingerprint image and a reference image through the optical fingerprint sensor when the screen displays the screen display light spot and the specific pattern according to the pressing area of the medium, wherein the fingerprint image is an image containing the fingerprint of the medium , The reference image is an image containing the specific pattern;

The detection module is configured to detect the intensity of the light displayed on the screen according to the intensity information of the specific pattern in the reference image, and detect the optical fingerprint according to the position information of the specific pattern in the reference image The relative displacement of the sensor and the screen;

The calibration module is configured to calibrate the fingerprint image according to the intensity of the light displayed on the screen and the relative displacement obtained by the detection module.
The device according to claim 13, further comprising:

The display control module is configured to control the screen to display the screen display light spot and the specific pattern according to the pressing area of the medium on the screen.
The device according to claim 14, wherein the screen display spot and the specific pattern are simultaneously displayed on the screen;

Wherein, the screen display light spot is displayed at the position of the pressing area, and the specific pattern is superimposed and displayed in the screen display light spot; or, the specific pattern and the screen display light spot are respectively displayed in the pressing area In different locations.
The device according to claim 15, wherein the specific pattern is superimposed and displayed in the screen display spot, and the specific pattern is a pattern composed of lines with a predetermined width, and the color of the specific pattern is and The screen displays any colors with different colors of light spots.
15. The device according to claim 15, wherein the specific pattern and the screen display spot are respectively displayed at different positions in the pressing area, and the specific pattern is a pattern composed of lines with a predetermined width, The color of the specific pattern is any color different from the background color of the screen.
The device according to claim 14, wherein:

The screen display spot and the specific pattern are sequentially displayed on the screen in a time-sharing manner.
18. The device according to claim 18, wherein the specific pattern is a pattern composed of lines of a predetermined width, and the color of the specific pattern is any color different from the background color of the screen.
The device according to claim 18, wherein the specific pattern is a pattern composed of lines with a predetermined width and a predetermined figure, and the color of the specific pattern is any color different from the background color of the screen.
The device according to claim 20, wherein:

The detection module is specifically configured to detect the intensity of the light displayed on the screen according to the intensity information of the line pattern of the predetermined width in the reference image, and to detect the intensity of the predetermined graphic pattern in the reference image. The position information detects the relative displacement of the optical fingerprint sensor and the screen.
The device according to claim 20, wherein the colors of the predetermined graphics at different positions in the specific pattern are different;

The detection module is further configured to determine the color of the medium according to the reflectivity of the medium to the light of different colors of the predetermined pattern after the collection module collects the reference image through the optical fingerprint sensor, In order to perform anti-counterfeiting detection on the medium.
The device according to claim 18, wherein the specific pattern is a pattern composed of lines with a predetermined width, or the specific pattern is a blank pattern, and the color of the specific pattern is different from the background color of the screen Any color of

The display control module is specifically configured to control the specific pattern to be displayed on the screen first, and then superimpose and display the specific pattern and the screen display spot.
The device according to claim 23, wherein:

The collection module is further configured to collect a frame of images containing the specific pattern and ambient light through the optical fingerprint sensor after the display control module controls to display the specific pattern; superimpose and display on the display control module After the specific pattern and the screen display the light spot, collecting a frame of image containing the fingerprint of the medium and the ambient light by the optical fingerprint sensor;

The calibration module is also used to subtract the image containing the fingerprint and ambient light of the medium with the image containing the specific pattern and ambient light, so as to eliminate the influence of ambient light on fingerprint recognition.
An electronic device, comprising a memory, a processor, and a computer program stored on the memory and capable of running on the processor, and when the processor executes the computer program, the implementation is as claimed in claim 1. -12 The method described in any one.
A non-transitory computer-readable storage medium with a computer program stored thereon, wherein the computer program implements the method according to any one of claims 1-12 when the computer program is executed by a processor.