CN110276190B - Fingerprint identification method and related product - Google Patents

Fingerprint identification method and related product Download PDF

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CN110276190B
CN110276190B CN201910578406.0A CN201910578406A CN110276190B CN 110276190 B CN110276190 B CN 110276190B CN 201910578406 A CN201910578406 A CN 201910578406A CN 110276190 B CN110276190 B CN 110276190B
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target
fingerprint
fingerprint identification
preset
image
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CN110276190A (en
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吴安平
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/31—User authentication
    • G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints

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Abstract

The embodiment of the application discloses fingerprint identification method and related product, electronic equipment includes ultrasonic fingerprint identification module, and wherein the method includes: acquiring a target fingerprint image through the ultrasonic fingerprint identification module; determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module; when the target fingerprint acquisition area is not a preset area, adjusting a preset fingerprint identification threshold value to obtain a target fingerprint identification threshold value; matching the target fingerprint image with a preset fingerprint template; and when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold value, carrying out unlocking operation. By adopting the embodiment of the application, the fingerprint identification threshold value can be dynamically adjusted, and the intelligence of the ultrasonic fingerprint identification technology is improved.

Description

Fingerprint identification method and related product
Technical Field
The application relates to the technical field of electronic equipment, in particular to a fingerprint identification method and a related product.
Background
With the widespread use of electronic devices (such as mobile phones, tablet computers, and the like), the electronic devices have more and more applications and more powerful functions, and the electronic devices are developed towards diversification and personalization, and become indispensable electronic products in the life of users.
Fingerprint identification technology also becomes the standard matching technology of electronic equipment, and along with the development of fingerprint identification technology, ultrasonic fingerprint identification technology is more and more favored by suppliers at present, but ultrasonic fingerprint identification is not intelligent enough.
Disclosure of Invention
The embodiment of the application provides a fingerprint identification method and a related product, which can dynamically adjust a fingerprint identification threshold value and improve the intelligence of an ultrasonic fingerprint identification technology.
In a first aspect, an embodiment of the present application provides an electronic device, which includes a processing circuit and an ultrasonic fingerprint identification module connected to the processing circuit, wherein,
the ultrasonic fingerprint identification module is used for acquiring a target fingerprint image;
the processing circuit is used for determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module; when the target fingerprint acquisition area is not a preset area, adjusting a preset fingerprint identification threshold value to obtain a target fingerprint identification threshold value; matching the target fingerprint image with a preset fingerprint template; and when the matching value between the target fingerprint image and the preset fingerprint template is larger than the target fingerprint identification threshold, carrying out unlocking operation.
In a second aspect, an embodiment of the present application provides a fingerprint identification method, which is applied to an electronic device, where the electronic device includes an ultrasonic fingerprint identification module; the method comprises the following steps:
acquiring a target fingerprint image through the ultrasonic fingerprint identification module;
determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module;
when the target fingerprint acquisition area is not a preset area, adjusting a preset fingerprint identification threshold value to obtain a target fingerprint identification threshold value;
matching the target fingerprint image with a preset fingerprint template;
and when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold value, carrying out unlocking operation.
In a third aspect, an embodiment of the present application provides a fingerprint identification apparatus, which is applied to an electronic device, where the electronic device includes an ultrasonic fingerprint identification module; the device comprises: a first obtaining unit, a first determining unit, an adjusting unit, a matching unit and an unlocking unit, wherein,
the first acquisition unit is used for acquiring a target fingerprint image through the ultrasonic fingerprint identification module;
the first determining unit is used for determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module;
the adjusting unit is used for adjusting a preset fingerprint identification threshold value to obtain a target fingerprint identification threshold value when the target fingerprint acquisition area is not a preset area;
the matching unit is used for matching the target fingerprint image with a preset fingerprint template;
the unlocking unit is used for unlocking when the matching value between the target fingerprint image and the preset fingerprint template is larger than the target fingerprint identification threshold value.
In a fourth aspect, an embodiment of the present application provides an electronic device, including a processor, a memory, a communication interface, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for executing the steps in the second aspect of the embodiment of the present application.
In a fifth aspect, the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program makes a computer perform some or all of the steps described in the second aspect of the present application.
In a sixth aspect, embodiments of the present application provide a computer program product, where the computer program product includes a non-transitory computer-readable storage medium storing a computer program, where the computer program is operable to cause a computer to perform some or all of the steps as described in the second aspect of embodiments of the present application. The computer program product may be a software installation package.
The embodiment of the application has the following beneficial effects:
it can be seen that the fingerprint identification method and related product described in the embodiments of the present application are applied to an electronic device, the electronic device includes an ultrasonic fingerprint identification module, a target fingerprint image is obtained through the ultrasonic fingerprint identification module, a target fingerprint collection area corresponding to the target fingerprint image is determined, the target fingerprint collection area is a partial area of all fingerprint collection areas of the ultrasonic fingerprint identification module, when the target fingerprint collection area is not a preset area, a preset fingerprint identification threshold is adjusted to obtain a target fingerprint identification threshold, the target fingerprint image is matched with a preset fingerprint template, when a matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold, an unlocking operation is performed, when the fingerprint collection area is not a designated area or a common area, the fingerprint identification threshold is dynamically adjusted, the fingerprint identification safety is improved, and the intelligence of the ultrasonic fingerprint identification technology is also improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1A is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;
fig. 1B is a schematic structural diagram of another electronic device provided in the embodiment of the present application;
fig. 1C is a schematic flowchart of a fingerprint identification method according to an embodiment of the present application;
fig. 1D is a schematic illustration of a fingerprint acquisition area provided in an embodiment of the present application;
FIG. 2 is a schematic flowchart of another fingerprint identification method provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
FIG. 4A is a block diagram illustrating functional units of a fingerprint identification device according to an embodiment of the present disclosure;
FIG. 4B is a block diagram illustrating functional elements of another fingerprint identification device according to an embodiment of the present disclosure;
FIG. 4C is a block diagram of functional units of another fingerprint identification device provided in the embodiments of the present application;
fig. 4D is a block diagram illustrating functional units of another fingerprint identification device according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The electronic device related to the embodiments of the present application may include various handheld devices, vehicle-mounted devices, wearable devices (smart watches, smart bracelets, wireless headsets, augmented reality/virtual reality devices, smart glasses), computing devices or other processing devices connected to wireless modems, and various forms of User Equipment (UE), Mobile Stations (MS), terminal devices (terminal device), and the like, which have wireless communication functions. For convenience of description, the above-mentioned devices are collectively referred to as electronic devices.
The following describes embodiments of the present application in detail.
Referring to fig. 1A, fig. 1A is a schematic structural diagram of an electronic device disclosed in an embodiment of the present application, the electronic device 100 includes a storage and processing circuit 110, and a sensor 170 connected to the storage and processing circuit 110, where:
the electronic device 100 may include control circuitry, which may include storage and processing circuitry 110. The storage and processing circuitry 110 may be a memory, such as a hard drive memory, a non-volatile memory (e.g., flash memory or other electronically programmable read-only memory used to form a solid state drive, etc.), a volatile memory (e.g., static or dynamic random access memory, etc.), etc., and the embodiments of the present application are not limited thereto. Processing circuitry in storage and processing circuitry 110 may be used to control the operation of electronic device 100. The processing circuitry may be implemented based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio codec chips, application specific integrated circuits, display driver integrated circuits, and the like.
The storage and processing circuitry 110 may be used to run software in the electronic device 100, such as an Internet browsing application, a Voice Over Internet Protocol (VOIP) telephone call application, an email application, a media playing application, operating system functions, and so forth. Such software may be used to perform control operations such as, for example, camera-based image capture, ambient light measurement based on an ambient light sensor, proximity sensor measurement based on a proximity sensor, information display functionality based on status indicators such as status indicator lights of light emitting diodes, touch event detection based on a touch sensor, functionality associated with displaying information on multiple (e.g., layered) display screens, operations associated with performing wireless communication functionality, operations associated with collecting and generating audio signals, control operations associated with collecting and processing button press event data, and other functions in the electronic device 100, to name a few.
The electronic device 100 may include input-output circuitry 150. The input-output circuit 150 may be used to enable the electronic device 100 to input and output data, i.e., to allow the electronic device 100 to receive data from an external device and also to allow the electronic device 100 to output data from the electronic device 100 to the external device. The input-output circuit 150 may further include a sensor 170. Sensor 170 may include the ultrasonic fingerprint identification module, may also include ambient light sensor, proximity sensor based on light and electric capacity, touch sensor (for example, based on light touch sensor and/or capacitanc touch sensor, wherein, touch sensor may be a part of touch display screen, also can regard as a touch sensor structure independent utility), acceleration sensor, and other sensors etc., the ultrasonic fingerprint identification module can be integrated in the screen below, or, the ultrasonic fingerprint identification module can set up in electronic equipment's side or back, do not do the restriction here, this ultrasonic fingerprint identification module can be used to gather the fingerprint image.
Input-output circuit 150 may also include one or more display screens, such as display screen 130. The display 130 may include one or a combination of liquid crystal display, organic light emitting diode display, electronic ink display, plasma display, display using other display technologies. The display screen 130 may include an array of touch sensors (i.e., the display screen 130 may be a touch display screen). The touch sensor may be a capacitive touch sensor formed by a transparent touch sensor electrode (e.g., an Indium Tin Oxide (ITO) electrode) array, or may be a touch sensor formed using other touch technologies, such as acoustic wave touch, pressure sensitive touch, resistive touch, optical touch, and the like, and the embodiments of the present application are not limited thereto.
The electronic device 100 may also include an audio component 140. The audio component 140 may be used to provide audio input and output functionality for the electronic device 100. The audio components 140 in the electronic device 100 may include a speaker, a microphone, a buzzer, a tone generator, and other components for generating and detecting sound.
The communication circuit 120 may be used to provide the electronic device 100 with the capability to communicate with external devices. The communication circuit 120 may include analog and digital input-output interface circuits, and wireless communication circuits based on radio frequency signals and/or optical signals. The wireless communication circuitry in communication circuitry 120 may include radio-frequency transceiver circuitry, power amplifier circuitry, low noise amplifiers, switches, filters, and antennas. For example, the wireless Communication circuitry in Communication circuitry 120 may include circuitry to support Near Field Communication (NFC) by transmitting and receiving Near Field coupled electromagnetic signals. For example, the communication circuit 120 may include a near field communication antenna and a near field communication transceiver. The communications circuitry 120 may also include a cellular telephone transceiver and antenna, a wireless local area network transceiver circuitry and antenna, and so forth.
The electronic device 100 may further include a battery, power management circuitry, and other input-output units 160. The input-output unit 160 may include buttons, joysticks, click wheels, scroll wheels, touch pads, keypads, keyboards, cameras, light emitting diodes and other status indicators, and the like.
A user may input commands through input-output circuitry 150 to control the operation of electronic device 100, and may use output data of input-output circuitry 150 to enable receipt of status information and other outputs from electronic device 100.
In a possible example, taking the ultrasonic fingerprint identification module as an example below the screen, as shown in fig. 1B, fig. 1B is a schematic structural diagram of an electronic device, and the electronic device 100 may include a glass Cover plate (Cover glass)210, a display screen (OLED)220, an Adhesive layer (Adhesive)230, a substrate (TFTGlass)240, a Pixel layer (Pixel)250, a piezoelectric material layer (polymer) 260, an Ag Ink layer 270, and a solidified Adhesive layer (DAF) 280. Of course, the glass cover plate may further include a film layer (film), which may be a tempered film for protecting the display screen of the electronic device.
Further, the ultrasonic fingerprint identification module can include: the TFT Glass layer, the Pixel layer, the Ag Ink layer and the solidification glue layer. The TFT Glass layer is used for metal wiring and material coating; the Pixel layer is used for embedding a Metal electrode on the TFTGlass, is used as a cathode for transmitting/receiving ultrasonic waves and is also called a piezoelectric transduction material, and can realize mutual conversion of material deformation-voltage; an Ag Ink layer used as a positive electrode for ultrasonic transmission/reception; the DAF is a solidified glue and is used for protecting the ultrasonic fingerprint identification module; the Adhesive layer is formed by bonding the ultrasonic fingerprint identification module at the bottom of the OLED screen.
In a specific implementation, the ultrasonic fingerprint identification module may include 2 states, a TX state (for transmitting ultrasonic waves) and an RX state (for receiving ultrasonic waves).
In a TX state, high-frequency (usually 10MHz level) oscillation signals such as sine waves are provided through electrodes (a Pixel negative electrode and an Ag Ink positive electrode) at two ends of a Copolymer (piezoelectric material), the Copolymer can generate vibration of response frequency and emit ultrasonic waves, the ultrasonic waves transmitted upwards reach fingerprints in contact with the surface of a screen after penetrating through an OLED screen, and when fingerprint valley ridges are attached to the screen, the difference between the acoustic resistance characteristic of air in the fingerprint valleys and the acoustic resistance characteristic of glass on the surface of the screen is large, the difference between the acoustic resistance characteristic of skin tissues of the fingerprint ridges and the acoustic resistance characteristic of glass on the surface of the screen is large, so the intensity of ultrasonic reflection signals of the fingerprint valley ridges is different.
In an RX state, after reflected ultrasonic waves pass through the display screen again and reach the ultrasonic fingerprint identification module (Pixel-Copolymer-Ag Ink), the Copolymer is caused to vibrate to generate electric signals, the vibration intensity of the Copolymer in Pixel areas corresponding to fingerprint ridges at different positions is different, so that the potential differences received by the pixels at different positions are different (the Ag Ink is equal potential), the potential differences are converted into two-dimensional image signals, and an ultrasonic fingerprint image is obtained.
The electronic device described with reference to fig. 1A and 1B may be configured to implement the following functions:
the ultrasonic fingerprint identification module is used for acquiring a target fingerprint image;
the processing circuit is used for determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module; when the target fingerprint acquisition area is not a preset area, adjusting a preset fingerprint identification threshold value to obtain a target fingerprint identification threshold value; matching the target fingerprint image with a preset fingerprint template; and when the matching value between the target fingerprint image and the preset fingerprint template is larger than the target fingerprint identification threshold, carrying out unlocking operation.
In one possible example, in the aspect of adjusting the preset fingerprint identification threshold to obtain the target fingerprint identification threshold, the processing circuit is specifically configured to:
determining a first center position of the target fingerprint image;
determining a second central position of the preset area;
determining a target distance between the first center position and the second center position;
determining a target adjustment coefficient corresponding to the target distance according to a mapping relation between a preset distance and an adjustment coefficient;
and adjusting the preset fingerprint identification threshold value according to the target adjustment coefficient to obtain the target fingerprint identification threshold value.
In one possible example, the processing circuitry is specifically configured to:
dividing all the fingerprint acquisition areas into a plurality of areas;
determining a sub-value of a fingerprint image of a specified type acquired by each area in the plurality of areas to obtain a plurality of sub-values, wherein each area corresponds to one sub-value;
and selecting the maximum value of the multiple numerical values, and taking the area corresponding to the maximum value as the preset area.
In one possible example, the processing circuitry is specifically configured to:
acquiring a current position;
and when the current position does not belong to a preset position, executing the step of adjusting the preset fingerprint identification threshold value.
In one possible example, the ultrasonic fingerprint identification module is further specifically configured to:
carrying out proximity detection;
when detecting that the distance between a proximity object and the ultrasonic fingerprint identification module is smaller than a first preset distance, acquiring a target image of the proximity object;
the processing circuit is further used for extracting the contour of the target image to obtain a target contour image;
when the target contour image meets a preset requirement, confirming that the approaching object is a finger;
the ultrasonic fingerprint identification module is also specifically used for being close the object with ultrasonic fingerprint identification module is still specifically used for being close the object with when distance between the ultrasonic fingerprint identification module is less than the second and predetermines the distance, carry out through the step that the ultrasonic fingerprint identification module acquires the target fingerprint image, the second is predetermine the distance and is less than first predetermines the distance.
It can be seen that the electronic device described in the embodiments of the present application, which includes the ultrasonic fingerprint identification module, acquiring a target fingerprint image through the ultrasonic fingerprint identification module, determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module, when the target fingerprint collecting area is not the preset area, adjusting the preset fingerprint identification threshold value to obtain the target fingerprint identification threshold value, matching the target fingerprint image with the preset fingerprint template, when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold value, the unlocking operation is carried out, when the fingerprint acquisition area is not a designated area or a common area, the fingerprint identification threshold value can be dynamically adjusted, the fingerprint identification safety is improved, and the intelligence of the ultrasonic fingerprint identification technology is also improved.
Referring to fig. 1C, fig. 1C is a schematic flow chart of a fingerprint identification method according to an embodiment of the present application, and as shown in the drawing, the fingerprint identification method is applied to the electronic device shown in fig. 1A, where the electronic device includes an ultrasonic fingerprint identification module, and the fingerprint identification method includes:
101. through ultrasonic wave fingerprint identification module acquires the target fingerprint image.
Wherein, ultrasonic fingerprint identification module can integrate in the display screen below, as shown in fig. 1D, ultrasonic fingerprint identification module corresponds fingerprint collection region, and fingerprint collection region corresponds the touch-control region of whole or partial display screen, and fingerprint collection region can realize carrying out fingerprint collection to one or more fingers. Touch-control is regional to or is close the touch-control of the display screen that the fingerprint collection area corresponds at the finger, then electronic equipment can carry out fingerprint collection through ultrasonic fingerprint identification module, obtains target fingerprint image.
In a possible example, the step 101, by acquiring the target fingerprint image by the ultrasonic fingerprint identification module, may include the following steps:
11. when touch operation aiming at the fingerprint acquisition area is detected, acquiring target touch parameters aiming at the display screen;
12. determining a target working parameter corresponding to the target touch parameter according to a mapping relation between a preset touch parameter and a working parameter of the ultrasonic fingerprint identification module;
13. and controlling the ultrasonic fingerprint identification module to perform fingerprint acquisition according to the target working parameters to obtain the target fingerprint image.
The touch parameter may be at least one of the following: the touch force of the touch display screen, the touch time of the touch display screen, the touch area of the touch display screen, the number of touch points of the touch display screen, and the like, which are not limited herein. The working parameters of the ultrasonic fingerprint identification module can be at least one of the following: the transmitting power of ultrasonic fingerprint identification module, the operating frequency of ultrasonic fingerprint identification module, the operating current of ultrasonic fingerprint identification module, the operating voltage of ultrasonic fingerprint identification module and the operating power of ultrasonic fingerprint identification module etc. do not do the restriction here.
In the specific implementation, a mapping relation between a preset touch parameter and a working parameter of the ultrasonic fingerprint identification module can be stored in the electronic equipment in advance, the electronic equipment can acquire a target touch parameter for the display screen when detecting touch operation for a fingerprint acquisition area, the target working parameter corresponding to the target touch parameter is determined according to the mapping relation, and fingerprint acquisition is performed according to the target working parameter to obtain a target fingerprint image. Because the working parameter of ultrasonic fingerprint identification module is closely relevant with the touch-control parameter, consequently, can obtain the working parameter who corresponds with the touch-control operation and carry out fingerprint collection, obtain the better fingerprint image of image quality, for example, the touch-control dynamics is too light, and probably the fingerprint detail is unclear, then can promote fingerprint image quality to a certain extent through the transmitted power who promotes the ultrasonic fingerprint identification module.
In a possible example, before the step 101, the following steps may be further included:
a1, carrying out proximity detection through the ultrasonic fingerprint identification module;
a2, when the distance between the approaching object and the ultrasonic fingerprint identification module is detected to be smaller than a first preset distance, acquiring a target image of the approaching object;
a3, extracting the contour of the target image to obtain a target contour image;
a4, when the target profile image meets the preset requirement, confirming that the approaching object is a finger, and when the distance between the approaching object and the ultrasonic fingerprint identification module is smaller than a second preset distance, executing the step of acquiring the target fingerprint image through the ultrasonic fingerprint identification module, wherein the second preset distance is smaller than the first preset distance.
The first preset distance and the second preset distance can be set by a user or defaulted by a system, and the second preset distance is smaller than the first preset distance. The proximity object may be a finger or other object. The preset requirement can also be set by the user or default by the system, for example, if the shape of the target profile image is a finger profile shape, it is determined that the target profile image meets the preset requirement, and if the average width of the target profile image is within a preset range, it is determined that the target profile image meets the preset requirement, and the like, in a specific implementation, the electronic device can perform proximity detection through the ultrasonic fingerprint identification module, and when it is detected that the distance between the proximity object and the ultrasonic fingerprint identification module is smaller than a first preset distance, it can acquire the target image of the proximity object, and further, can perform profile extraction on the target image, specifically, can perform hough transformation on the target image to obtain the target profile image, and when the target profile image meets the preset requirement, it is determined that the proximity object is a finger, and further, when the distance between the proximity object and the ultrasonic fingerprint identification module is smaller than a second preset distance, and (5) fingerprint acquisition is carried out.
102. Confirm the target fingerprint collection area that the target fingerprint image corresponds, the target fingerprint collection area is the regional subregion of all fingerprint collections of ultrasonic fingerprint identification module.
Wherein, after having confirmed target fingerprint image, can confirm the target fingerprint collection area that target fingerprint image corresponds very easily, the touch-control area of the display screen that target fingerprint image corresponds promptly, this target fingerprint collection area is the regional subregion of whole fingerprint collection of ultrasonic fingerprint identification module.
103. And when the target fingerprint acquisition area is not the preset area, adjusting a preset fingerprint identification threshold value to obtain the target fingerprint identification threshold value.
The preset area can be set by the user or defaulted by the system, and the preset fingerprint identification threshold value can be stored in the electronic equipment in advance. In specific implementation, the preset fingerprint identification threshold may be adjusted to a fixed value, or the preset fingerprint identification threshold may be adjusted according to a certain rule.
In a possible example, the step 103 of adjusting the preset fingerprint identification threshold to obtain the target fingerprint identification threshold may include the following steps:
31. determining a first center position of the target fingerprint image;
32. determining a second central position of the preset area;
33. determining a target distance between the first center position and the second center position;
34. determining a target adjustment coefficient corresponding to the target distance according to a mapping relation between a preset distance and an adjustment coefficient;
35. and adjusting the preset fingerprint identification threshold value according to the target adjustment coefficient to obtain the target fingerprint identification threshold value.
In a specific implementation, the electronic device may determine a first center position of the target fingerprint image and a second center position of the preset region in a geometric manner, and further may determine a target distance between the first center position and the second center position, and the electronic device may further pre-store a mapping relationship between a preset distance and an adjustment coefficient, and further determine a target adjustment coefficient corresponding to the target distance according to the mapping relationship, where the adjustment coefficient is a real number, and a value range of the adjustment coefficient is at least one of [ -1,1], [0,1], [ -1,1], and the like, and is not limited herein. Further, the preset fingerprint identification threshold may be adjusted according to the target adjustment coefficient to obtain the target fingerprint identification threshold, specifically, the target fingerprint identification threshold is the preset fingerprint identification threshold and the target adjustment coefficient, or the target fingerprint identification threshold is the preset fingerprint identification threshold + the target adjustment coefficient, which is not limited herein.
In one possible example, the following steps may be further included:
b1, dividing the whole fingerprint acquisition area into a plurality of areas;
b2, determining a sub-value of the fingerprint image of the specified type acquired by each area in the plurality of areas to obtain a plurality of sub-values, wherein each area corresponds to one sub-value;
and B3, selecting the maximum value of the multiple sub-values, and taking the area corresponding to the maximum value as the preset area.
Wherein, the fingerprint image of the specified type can be at least one of the following: the actual fingerprint, or the fingerprint that can be successfully used for unlocking, is not limited herein, and the actual fingerprint may be understood as a fingerprint pattern of a human being.
In specific implementation, the electronic device may divide all fingerprint acquisition regions into a plurality of regions, there is no overlap or partial overlap between the plurality of regions, and then, a sub-value of an appointed type fingerprint image acquired by each region in the plurality of regions may be determined, a plurality of sub-values are obtained, each region corresponds to one sub-value, the sub-value may be counted in a preset time period, the preset time period may be set by a user or default to a system, for example, each time of fingerprint acquisition, the acquired fingerprint image may be identified, whether the identified fingerprint image is the appointed type fingerprint image is identified, if so, the region corresponding to the identified fingerprint image is subjected to + 1. Furthermore, the maximum value of the plurality of sub-values may be selected, and the area corresponding to the maximum value may be used as the preset area. That is, the preset area may be understood as an area where the user frequently performs a fingerprint operation.
In a possible example, before the step 103 adjusts the preset fingerprint identification threshold, the method may further include the following steps:
c1, acquiring the current position;
c2, when the current position does not belong to the preset position, executing the step of adjusting the preset fingerprint identification threshold value.
Wherein, above-mentioned preset position can be set up by oneself by the user or the system is acquiescent, and in concrete the realization, electronic equipment can obtain the current position through location technology, does not belong to preset position at the current position, then can carry out the step of fingerprint identification threshold value is predetermine in the adjustment, belongs to preset position at the current position, then can not need to adjust the fingerprint identification threshold value, for example, the user can not adjust the fingerprint identification threshold value at home, and the user is at public place, then needs to adjust the fingerprint identification threshold value.
104. And matching the target fingerprint image with a preset fingerprint template.
The preset fingerprint template can be pre-stored in the electronic equipment.
In one possible example, the step 104 of matching the target fingerprint image with a preset fingerprint template may include the following steps:
41. carrying out image segmentation on the target fingerprint image to obtain a target fingerprint area image;
42. analyzing the distribution of the characteristic points of the target fingerprint area image;
43. performing circular image interception on the target fingerprint area image according to M different circle centers to obtain M circular fingerprint area images, wherein M is an integer greater than 3;
44. selecting a target circular fingerprint area image from the M circular fingerprint area images, wherein the number of characteristic points contained in the target circular fingerprint area image is greater than that of other circular fingerprint area images in the M circular fingerprint area images;
45. dividing the target circular fingerprint area image to obtain N circular rings, wherein the widths of the N circular rings are the same;
46. sequentially matching the N circular rings with the preset fingerprint template for feature points from the circular ring with the smallest radius in the N circular rings, and accumulating the matching values of the matched circular rings;
47. and when the accumulated matching value is larger than the target fingerprint identification threshold value, immediately stopping the characteristic point matching, and outputting a prompt message of successful fingerprint identification.
Wherein, the electronic device can perform image segmentation on a target fingerprint image to obtain a target fingerprint area image, further analyze the feature point distribution of the target fingerprint area image, perform circular image interception on the target fingerprint area image according to M different circle centers to obtain M circular fingerprint area images, M is an integer greater than 3, select the target circular fingerprint area image from the M circular fingerprint area images, the number of the feature points contained in the target circular fingerprint area image is greater than that of other circular fingerprint area images in the M circular fingerprint area images, divide the target circular fingerprint area image to obtain N circular rings, the ring widths of the N circular rings are the same, perform feature point matching on the N circular rings with a preset fingerprint template in sequence from the circular ring with the smallest radius among the N circular rings, and accumulate the matching values of the matched circular rings, thus, in the fingerprint identification process, the feature points of different positions or different fingerprints can be used for matching, namely, the whole fingerprint image is sampled, and the sampling can cover the whole fingerprint area, so that corresponding representative features can be found from each area for matching, when the accumulated matching value is greater than the target fingerprint identification threshold value, the feature point matching is immediately stopped, and the prompt message of the fingerprint identification success is output, therefore, the fingerprint identification can be quickly and accurately identified.
105. And when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold value, carrying out unlocking operation.
Wherein the unlocking operation can be at least one of the following: entering a main page by locking or blank screen, or starting a preset application by locking or blank screen, or executing a preset operation, wherein the preset operation can be at least one of the following operations: deletion operation, modification operation, compression operation, selection operation, photographing operation, payment operation, and the like, without limitation. The electronic equipment can perform unlocking operation when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold, otherwise, prompt the user that the fingerprint unlocking is failed or prompt the user to perform fingerprint input again when the matching value between the target fingerprint image and the preset fingerprint template is less than or equal to the target fingerprint identification threshold.
It can be seen that the fingerprint identification method described in the embodiments of the present application is applied to an electronic device, which includes an ultrasonic fingerprint identification module, acquires a target fingerprint image through the ultrasonic fingerprint identification module, determines a target fingerprint collection area corresponding to the target fingerprint image, where the target fingerprint collection area is a partial area of all fingerprint collection areas of the ultrasonic fingerprint identification module, adjusts a preset fingerprint identification threshold value when the target fingerprint collection area is not a preset area, obtains the target fingerprint identification threshold value, matches the target fingerprint image with a preset fingerprint template, performs an unlocking operation when a matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold value, can dynamically adjust the fingerprint identification threshold value when the fingerprint collection area is not a designated area or a designated area, and improves fingerprint identification security, the intelligence of the ultrasonic fingerprint identification technology is also improved.
Referring to fig. 2 in a manner consistent with the embodiment shown in fig. 1C, fig. 2 is a schematic flowchart of a fingerprint identification method provided in an embodiment of the present application, and as shown in the drawing, the method is applied to the electronic device shown in fig. 1A, where the electronic device includes an ultrasonic fingerprint identification module; the fingerprint identification method comprises the following steps:
201. through ultrasonic wave fingerprint identification module is close and is detected.
202. When detecting that it is close the object with distance between the ultrasonic fingerprint identification module is less than first preset distance, acquire the target image of being close the object.
203. And carrying out contour extraction on the target image to obtain a target contour image.
204. When the target profile image meets the preset requirement, the approaching object is confirmed to be a finger, and when the distance between the approaching object and the ultrasonic fingerprint identification module is smaller than a second preset distance, the target fingerprint image is acquired through the ultrasonic fingerprint identification module, and the second preset distance is smaller than the first preset distance.
205. Confirm the target fingerprint collection area that the target fingerprint image corresponds, the target fingerprint collection area is the regional subregion of all fingerprint collections of ultrasonic fingerprint identification module.
206. And when the target fingerprint acquisition area is not the preset area, adjusting a preset fingerprint identification threshold value to obtain the target fingerprint identification threshold value.
207. And matching the target fingerprint image with a preset fingerprint template.
208. And when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold value, carrying out unlocking operation.
For the detailed description of the steps 201 to 208, reference may be made to the corresponding steps of the fingerprint identification method described in the foregoing fig. 1C, and details are not repeated here.
It can be seen that the fingerprint identification method that describes in the embodiment of the application is applied to electronic equipment, and this electronic equipment includes ultrasonic fingerprint identification module, not only can realize being close to the detection, and when being close to detecting the finger, just carry out fingerprint collection, and can be when fingerprint collection region is not specified region or common use region, dynamic adjustment fingerprint identification threshold value promotes the fingerprint identification security, has also promoted the intelligent of ultrasonic fingerprint identification technique.
In accordance with the foregoing embodiments, please refer to fig. 3, where fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application, where as shown in the figure, the electronic device includes a processor, a memory, a communication interface, and one or more programs, the electronic device includes an ultrasonic fingerprint identification module, the one or more programs are stored in the memory and configured to be executed by the processor, and in an embodiment of the present application, the programs include instructions for performing the following steps:
acquiring a target fingerprint image through the ultrasonic fingerprint identification module;
determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module;
when the target fingerprint acquisition area is not a preset area, adjusting a preset fingerprint identification threshold value to obtain a target fingerprint identification threshold value;
matching the target fingerprint image with a preset fingerprint template;
and when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold value, carrying out unlocking operation.
It can be seen that the electronic device described in the embodiments of the present application, which includes the ultrasonic fingerprint identification module, acquiring a target fingerprint image through the ultrasonic fingerprint identification module, determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module, when the target fingerprint collecting area is not the preset area, adjusting the preset fingerprint identification threshold value to obtain the target fingerprint identification threshold value, matching the target fingerprint image with the preset fingerprint template, when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold value, the unlocking operation is carried out, when the fingerprint acquisition area is not a designated area or a common area, the fingerprint identification threshold value can be dynamically adjusted, the fingerprint identification safety is improved, and the intelligence of the ultrasonic fingerprint identification technology is also improved.
In one possible example, in the adjusting the preset fingerprinting threshold to obtain the target fingerprinting threshold, the above-mentioned program includes instructions for performing the following steps:
determining a first center position of the target fingerprint image;
determining a second central position of the preset area;
determining a target distance between the first center position and the second center position;
determining a target adjustment coefficient corresponding to the target distance according to a mapping relation between a preset distance and an adjustment coefficient;
and adjusting the preset fingerprint identification threshold value according to the target adjustment coefficient to obtain the target fingerprint identification threshold value.
In one possible example, the program further includes instructions for performing the steps of:
dividing all the fingerprint acquisition areas into a plurality of areas;
determining a sub-value of a fingerprint image of a specified type acquired by each area in the plurality of areas to obtain a plurality of sub-values, wherein each area corresponds to one sub-value;
and selecting the maximum value of the multiple numerical values, and taking the area corresponding to the maximum value as the preset area.
In one possible example, the program further includes instructions for performing the steps of:
acquiring a current position;
and when the current position does not belong to a preset position, executing the step of adjusting the preset fingerprint identification threshold value.
In one possible example, the program further includes instructions for performing the steps of:
proximity detection is carried out through the ultrasonic fingerprint identification module;
when detecting that the distance between a proximity object and the ultrasonic fingerprint identification module is smaller than a first preset distance, acquiring a target image of the proximity object;
carrying out contour extraction on the target image to obtain a target contour image;
when the target profile image meets the preset requirement, the approaching object is confirmed to be a finger, and when the distance between the approaching object and the ultrasonic fingerprint identification module is smaller than a second preset distance, the step of acquiring the target fingerprint image through the ultrasonic fingerprint identification module is executed, and the second preset distance is smaller than the first preset distance.
The above description has introduced the solution of the embodiment of the present application mainly from the perspective of the method-side implementation process. It is understood that the electronic device comprises corresponding hardware structures and/or software modules for performing the respective functions in order to realize the above-mentioned functions. Those of skill in the art will readily appreciate that the present application is capable of hardware or a combination of hardware and computer software implementing the various illustrative elements and algorithm steps described in connection with the embodiments provided herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiment of the present application, the electronic device may be divided into the functional units according to the method example, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
Fig. 4A is a block diagram of functional units of a fingerprint identification device 400 according to an embodiment of the present application. The fingerprint identification device 400 is applied to electronic equipment, wherein the electronic equipment comprises an ultrasonic fingerprint identification module; the apparatus 400 comprises: a first obtaining unit 401, a first determining unit 402, an adjusting unit 403, a matching unit 404 and an unlocking unit 405, wherein,
the first obtaining unit 401 is configured to obtain a target fingerprint image through the ultrasonic fingerprint identification module;
a first determining unit 402, configured to determine a target fingerprint acquisition area corresponding to the target fingerprint image, where the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module;
an adjusting unit 403, configured to adjust a preset fingerprint identification threshold to obtain a target fingerprint identification threshold when the target fingerprint acquisition area is not a preset area;
a matching unit 404, configured to match the target fingerprint image with a preset fingerprint template;
an unlocking unit 405, configured to perform an unlocking operation when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold.
It can be seen that the fingerprint identification device described in the embodiments of the present application is applied to an electronic device, the electronic device includes an ultrasonic fingerprint identification module, a target fingerprint image is obtained through the ultrasonic fingerprint identification module, a target fingerprint collection area corresponding to the target fingerprint image is determined, the target fingerprint collection area is a partial area of all fingerprint collection areas of the ultrasonic fingerprint identification module, when the target fingerprint collection area is not a preset area, a preset fingerprint identification threshold is adjusted to obtain a target fingerprint identification threshold, the target fingerprint image is matched with a preset fingerprint template, when a matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold, an unlocking operation is performed, when the fingerprint collection area is not a designated area or a designated area, the fingerprint identification threshold is dynamically adjusted, and fingerprint identification security is improved, the intelligence of the ultrasonic fingerprint identification technology is also improved.
In a possible example, in terms of the adjusting the preset fingerprint identification threshold to obtain the target fingerprint identification threshold, the adjusting unit 403 is specifically configured to:
determining a first center position of the target fingerprint image;
determining a second central position of the preset area;
determining a target distance between the first center position and the second center position;
determining a target adjustment coefficient corresponding to the target distance according to a mapping relation between a preset distance and an adjustment coefficient;
and adjusting the preset fingerprint identification threshold value according to the target adjustment coefficient to obtain the target fingerprint identification threshold value.
In one possible example, as shown in fig. 4B, fig. 4B is a further modified structure of the fingerprint identification device shown in fig. 4A, which may further include, compared with fig. 4A: the dividing unit 406, the second determining unit 407, and the selecting unit 408 are specifically as follows:
a dividing unit 406, configured to divide the entire fingerprint acquisition area into a plurality of areas;
a second determining unit 407, configured to determine a sub-value of the fingerprint image of the specified type acquired in each of the multiple regions, to obtain multiple sub-values, where each region corresponds to one sub-value;
the selecting unit 408 is configured to select a maximum value of the multiple sub-values, and use a region corresponding to the maximum value as the preset region.
In one possible example, as shown in fig. 4C, fig. 4C is a further modified structure of the fingerprint identification device shown in fig. 4A, which may further include, compared with fig. 4A: the second obtaining unit 409 is specifically as follows:
a second obtaining unit 409, configured to obtain a current position;
the step of adjusting the preset fingerprint identification threshold is performed by the adjusting unit 403 when the current position does not belong to a preset position.
In one possible example, as shown in fig. 4D, fig. 4D is a further modified structure of the fingerprint identification device shown in fig. 4A, which may further include, compared with fig. 4A: the detecting unit 410 and the extracting unit 411 are specifically as follows:
the detection unit 410 is used for performing proximity detection through the ultrasonic fingerprint identification module;
the first obtaining unit 401 is further configured to obtain a target image of the approaching object when it is detected that the distance between the approaching object and the ultrasonic fingerprint identification module is smaller than a first preset distance;
an extracting unit 411, configured to perform contour extraction on the target image to obtain a target contour image;
the first determining unit 402 is further specifically configured to determine that the approaching object is a finger when the target contour image meets a preset requirement, and the first obtaining unit 401 executes the step of obtaining the target fingerprint image through the ultrasonic fingerprint identification module when a distance between the approaching object and the ultrasonic fingerprint identification module is smaller than a second preset distance, where the second preset distance is smaller than the first preset distance.
It can be understood that the functions of each program module of the fingerprint identification device of this embodiment may be specifically implemented according to the method in the foregoing method embodiment, and the specific implementation process may refer to the related description of the foregoing method embodiment, which is not described herein again.
Embodiments of the present application also provide a computer storage medium, where the computer storage medium stores a computer program for electronic data exchange, the computer program enabling a computer to execute part or all of the steps of any one of the methods described in the above method embodiments, and the computer includes an electronic device.
Embodiments of the present application also provide a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any of the methods as described in the above method embodiments. The computer program product may be a software installation package, the computer comprising an electronic device.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit may be stored in a computer readable memory if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a memory, and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the above-mentioned method of the embodiments of the present application. And the aforementioned memory comprises: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash Memory disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (13)

1. An electronic device, comprising a processing circuit and an ultrasonic fingerprint identification module connected to the processing circuit, wherein,
ultrasonic wave fingerprint identification module for acquire target fingerprint image, specifically do: when touch operation aiming at a fingerprint acquisition area is detected, acquiring a target touch parameter aiming at a display screen, determining a target working parameter corresponding to the target touch parameter according to a mapping relation between a preset touch parameter and a working parameter of the ultrasonic fingerprint identification module, and controlling the ultrasonic fingerprint identification module to acquire a fingerprint according to the target working parameter to obtain a target fingerprint image;
the processing circuit is used for determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module; when the target fingerprint acquisition area is not a preset area, adjusting a preset fingerprint identification threshold value to obtain a target fingerprint identification threshold value; matching the target fingerprint image with a preset fingerprint template; and when the matching value between the target fingerprint image and the preset fingerprint template is larger than the target fingerprint identification threshold, carrying out unlocking operation.
2. The electronic device according to claim 1, wherein in the adjusting of the preset fingerprinting threshold to obtain the target fingerprinting threshold, the processing circuit is specifically configured to:
determining a first center position of the target fingerprint image;
determining a second central position of the preset area;
determining a target distance between the first center position and the second center position;
determining a target adjustment coefficient corresponding to the target distance according to a mapping relation between a preset distance and an adjustment coefficient;
and adjusting the preset fingerprint identification threshold value according to the target adjustment coefficient to obtain the target fingerprint identification threshold value.
3. The electronic device of claim 1 or 2, wherein the processing circuit is specifically configured to:
dividing all the fingerprint acquisition areas into a plurality of areas;
determining a sub-value of a fingerprint image of a specified type acquired by each area in the plurality of areas to obtain a plurality of sub-values, wherein each area corresponds to one sub-value;
and selecting the maximum value of the multiple numerical values, and taking the area corresponding to the maximum value as the preset area.
4. The electronic device of claim 1 or 2, wherein the processing circuit is specifically configured to:
acquiring a current position;
and when the current position does not belong to a preset position, executing the step of adjusting the preset fingerprint identification threshold value.
5. The electronic device of claim 1 or 2,
ultrasonic wave fingerprint identification module still specifically is used for:
carrying out proximity detection;
when detecting that the distance between a proximity object and the ultrasonic fingerprint identification module is smaller than a first preset distance, acquiring a target image of the proximity object;
the processing circuit is further used for extracting the contour of the target image to obtain a target contour image;
when the target contour image meets a preset requirement, confirming that the approaching object is a finger;
the ultrasonic fingerprint identification module is also specifically used for being close the object with when distance between the ultrasonic fingerprint identification module is less than the second and predetermines the distance, carry out through the step that the ultrasonic fingerprint identification module acquires the target fingerprint image, the second is predetermine the distance and is less than first predetermines the distance.
6. The fingerprint identification method is characterized by being applied to electronic equipment, wherein the electronic equipment comprises an ultrasonic fingerprint identification module; the method comprises the following steps:
through the ultrasonic fingerprint identification module acquires the target fingerprint image, specifically is: when touch operation aiming at a fingerprint acquisition area is detected, acquiring a target touch parameter aiming at a display screen, determining a target working parameter corresponding to the target touch parameter according to a mapping relation between a preset touch parameter and a working parameter of the ultrasonic fingerprint identification module, and controlling the ultrasonic fingerprint identification module to acquire a fingerprint according to the target working parameter to obtain a target fingerprint image;
determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module;
when the target fingerprint acquisition area is not a preset area, adjusting a preset fingerprint identification threshold value to obtain a target fingerprint identification threshold value;
matching the target fingerprint image with a preset fingerprint template;
and when the matching value between the target fingerprint image and the preset fingerprint template is greater than the target fingerprint identification threshold value, carrying out unlocking operation.
7. The method of claim 6, wherein the adjusting the pre-determined fingerprinting threshold to obtain the target fingerprinting threshold comprises:
determining a first center position of the target fingerprint image;
determining a second central position of the preset area;
determining a target distance between the first center position and the second center position;
determining a target adjustment coefficient corresponding to the target distance according to a mapping relation between a preset distance and an adjustment coefficient;
and adjusting the preset fingerprint identification threshold value according to the target adjustment coefficient to obtain the target fingerprint identification threshold value.
8. The method according to claim 6 or 7, characterized in that the method further comprises:
dividing all the fingerprint acquisition areas into a plurality of areas;
determining a sub-value of a fingerprint image of a specified type acquired by each area in the plurality of areas to obtain a plurality of sub-values, wherein each area corresponds to one sub-value;
and selecting the maximum value of the multiple numerical values, and taking the area corresponding to the maximum value as the preset area.
9. The method according to claim 6 or 7, characterized in that the method further comprises:
acquiring a current position;
and when the current position does not belong to a preset position, executing the step of adjusting the preset fingerprint identification threshold value.
10. The method according to claim 6 or 7, characterized in that the method further comprises:
proximity detection is carried out through the ultrasonic fingerprint identification module;
when detecting that the distance between a proximity object and the ultrasonic fingerprint identification module is smaller than a first preset distance, acquiring a target image of the proximity object;
carrying out contour extraction on the target image to obtain a target contour image;
when the target profile image meets the preset requirement, the approaching object is confirmed to be a finger, and when the distance between the approaching object and the ultrasonic fingerprint identification module is smaller than a second preset distance, the step of acquiring the target fingerprint image through the ultrasonic fingerprint identification module is executed, and the second preset distance is smaller than the first preset distance.
11. The fingerprint identification device is characterized by being applied to electronic equipment, wherein the electronic equipment comprises an ultrasonic fingerprint identification module; the device comprises: a first obtaining unit, a first determining unit, an adjusting unit, a matching unit and an unlocking unit, wherein,
first acquisition unit is used for passing through the ultrasonic fingerprint identification module acquires the target fingerprint image, specifically is: when touch operation aiming at a fingerprint acquisition area is detected, acquiring a target touch parameter aiming at a display screen, determining a target working parameter corresponding to the target touch parameter according to a mapping relation between a preset touch parameter and a working parameter of the ultrasonic fingerprint identification module, and controlling the ultrasonic fingerprint identification module to acquire a fingerprint according to the target working parameter to obtain a target fingerprint image;
the first determining unit is used for determining a target fingerprint acquisition area corresponding to the target fingerprint image, wherein the target fingerprint acquisition area is a partial area of all fingerprint acquisition areas of the ultrasonic fingerprint identification module;
the adjusting unit is used for adjusting a preset fingerprint identification threshold value to obtain a target fingerprint identification threshold value when the target fingerprint acquisition area is not a preset area;
the matching unit is used for matching the target fingerprint image with a preset fingerprint template;
the unlocking unit is used for unlocking when the matching value between the target fingerprint image and the preset fingerprint template is larger than the target fingerprint identification threshold value.
12. An electronic device comprising a processor, a memory for storing one or more programs and configured for execution by the processor, the programs comprising instructions for performing the steps of the method of any of claims 6-10.
13. A computer-readable storage medium, in which a computer program for electronic data exchange is stored, wherein the computer program, when executed by a computer, causes the computer to carry out the method according to any one of claims 6-10.
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