CN113486826A - Capacitance fingerprint identification method and device, finger sensing equipment, terminal equipment and storage medium - Google Patents
Capacitance fingerprint identification method and device, finger sensing equipment, terminal equipment and storage medium Download PDFInfo
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- CN113486826A CN113486826A CN202110785743.4A CN202110785743A CN113486826A CN 113486826 A CN113486826 A CN 113486826A CN 202110785743 A CN202110785743 A CN 202110785743A CN 113486826 A CN113486826 A CN 113486826A
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Abstract
The application provides a capacitance fingerprint identification method and device, a finger sensing device, a terminal device and a storage medium, wherein the capacitance fingerprint identification method comprises the following steps: receiving a first fingerprint image of a capacitive fingerprint sensor and finger detection information generated by a finger detection sensor for a finger of a user; identifying the pressing angle of the finger of the user according to the finger detection information, or determining the pressing angle according to at least two frames of fingerprint acquisition images, wherein the at least two frames of fingerprint acquisition images are acquired according to the finger pressing sequence of the user; rotating a second fingerprint image and a first fingerprint image which are recorded in advance in a rotating mode to the same direction according to the pressing angle; and carrying out fingerprint matching on the first fingerprint image and the second fingerprint image in the same direction to obtain a matching result. The accuracy of electric capacity fingerprint identification can be improved.
Description
Technical Field
The application relates to the field of fingerprint identification, in particular to a capacitance fingerprint identification method and device, a finger sensing device, a terminal device and a storage medium.
Background
The capacitive fingerprint identification technology is to form an image of a fingerprint by capacitance difference of fingerprint valley ridges and then perform fingerprint identification.
At present, the existing capacitance fingerprint identification technology has the defect of low fingerprint identification accuracy rate on the premise that the available matching effective fingerprint area is reduced.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method and an apparatus for capacitive fingerprint identification, a finger sensing device, a terminal device, and a storage medium, so as to overcome the disadvantage of low accuracy of fingerprint identification in the prior art on the premise that the number of valid fingerprint areas available for matching is reduced, thereby improving the accuracy of fingerprint identification.
To this end, a first aspect of the present application discloses a capacitive fingerprint identification method, the method comprising:
receiving a first fingerprint image of a capacitive fingerprint sensor and finger detection information generated by a finger detection sensor for a finger of the user;
identifying the pressing angle of the finger of the user according to the finger detection information, or determining the pressing angle according to at least two frames of fingerprint acquisition images, wherein the at least two frames of fingerprint acquisition images are acquired according to the finger pressing sequence of the user;
rotating a second fingerprint image and the first fingerprint image which are recorded in advance in a rotating mode to the same direction according to the pressing angle;
and fingerprint matching is carried out on the first fingerprint image and the second fingerprint image in the same direction, and a matching result is obtained.
According to the method, the pressing angle of the finger of the user is identified according to the finger detection information, or the pressing angle is determined according to at least two frames of fingerprint acquisition images, and then the second fingerprint image and the first fingerprint image which are input in advance can be rotated to the same direction according to the pressing angle, so that the directions of the second fingerprint image and the first fingerprint image can be kept consistent in the subsequent matching process, the situation that the fingerprint A and the fingerprint B cannot be successfully matched is avoided, but the fingerprint B can be successfully matched with the fingerprint A after the fingerprint B is rotated by 90 degrees, and the accuracy of fingerprint identification is improved.
In the first aspect of the present application, as an optional implementation manner, identifying a pressing angle of the finger of the user according to the finger detection information includes:
and judging whether the detection sensor is shielded or not when the finger of the user presses the capacitive fingerprint sensor according to the finger detection information, if so, determining that the pressing angle is that the finger of the user is parallel to the capacitive fingerprint sensor, and otherwise, determining that the pressing angle is that the finger of the user is perpendicular to the capacitive fingerprint sensor.
In the embodiment of the application, whether the finger of the user is used for shielding the detection sensor or not when the capacitive fingerprint sensor is pressed can be judged through the finger detection information, and then the pressing direction of the user is judged.
In the first aspect of the present application, as an optional implementation manner, the determining the pressing angle according to at least two frames of fingerprint collection images includes:
determining the grain gravity center of each frame of the fingerprint acquisition image;
and determining the pressing angle according to the change of the gravity center direction between the grain gravity center of the fingerprint collection image collected firstly and the grain gravity center of the fingerprint collection image collected later.
In this alternative embodiment, the pressing angle may be determined based on a change in the direction of the center of gravity between the grain center of gravity of the fingerprint collection image collected earlier and the grain center of gravity of the fingerprint collection image collected later.
In the first aspect of the present application, as an optional implementation manner, the determining the pressing angle according to a change in direction of a center of gravity between a grain center of gravity of the fingerprint collection image collected earlier and a grain center of gravity of the fingerprint collection image collected later includes:
calculating a vector difference between a grain gravity center of the fingerprint acquisition image acquired later and a grain gravity center of the fingerprint acquisition image acquired earlier, and taking the vector difference as the change of the gravity center direction;
and determining the pressing angle according to the vector difference.
In this optional embodiment, by calculating a vector difference between a grain center of gravity of the fingerprint captured image collected later and a grain center of gravity of the fingerprint captured image collected earlier, the vector difference can be used as the change of the direction of the center of gravity, and the pressing angle can be determined according to the vector difference.
The second aspect of the present application discloses a capacitive fingerprint recognition device, the device comprising:
the receiving module is used for receiving a first fingerprint image of the capacitive fingerprint sensor and finger detection information generated by the finger detection sensor aiming at the finger of the user;
the identification module is used for identifying the pressing angle of the finger of the user according to the finger detection information or determining the pressing angle according to at least two frames of fingerprint acquisition images, and the at least two frames of fingerprint acquisition images are acquired according to the finger pressing sequence of the user;
the image processing module is used for rotating a second fingerprint image and the first fingerprint image which are recorded in advance in a rotating mode to the same direction according to the pressing angle;
and the fingerprint matching module is used for performing fingerprint matching on the first fingerprint image and the second fingerprint image in the same direction and obtaining a matching result.
The device of this application is through the angle of pressing according to finger detection information identification user's finger, or confirm according to at least two frames fingerprint collection image and press the angle, and then can be according to pressing the angle and will type in advance second fingerprint image and first fingerprint image rotatory to same direction, so, just can follow-up matching in-process, make the direction of second fingerprint image and first fingerprint image keep unanimous, thereby avoid fingerprint A and fingerprint B to be can not match successfully, but through rotating fingerprint B behind 90 degrees, fingerprint B can match this kind of condition successfully with fingerprint A, thereby improve fingerprint identification's accuracy.
In the second aspect of the present application, as an optional implementation manner, the identification module includes:
and the judging submodule is used for judging whether the detection sensor is shielded or not when the finger of the user presses the capacitive fingerprint sensor according to the finger detection information, if so, determining that the pressing angle is that the finger of the user is parallel to the capacitive fingerprint sensor, and otherwise, determining that the pressing angle is that the finger of the user is perpendicular to the capacitive fingerprint sensor.
In the embodiment of the application, whether the finger of the user is used for shielding the detection sensor or not when the capacitive fingerprint sensor is pressed can be judged through the finger detection information, and then the pressing direction of the user is judged.
A third aspect of the present application discloses a finger sensing device, comprising a capacitive fingerprint sensor and finger detection sensors, wherein the finger detection sensors are disposed at left and right sides of the capacitive fingerprint sensor, and configured to generate a first detection signal when a finger of a user presses the capacitive fingerprint sensor in a direction parallel to the capacitive fingerprint sensor;
and the finger detecting sensor is further configured to generate a second detection signal when a finger of a user presses the capacitive fingerprint sensor in a direction perpendicular to the capacitive fingerprint sensor.
The finger sensing equipment can be applied to the method of the first aspect of the application, and then can be through the angle of pressing according to finger detection information identification user's finger, or confirm the angle of pressing according to at least two frames of fingerprint collection images, and then can rotate the second fingerprint image and the first fingerprint image of typing in advance to same direction according to the angle of pressing, so, just can follow-up matching in-process, make the direction of second fingerprint image and first fingerprint image keep unanimous, thereby avoid fingerprint A and fingerprint B can not match successfully, but through rotating fingerprint B90 degrees after, fingerprint B can match successfully this kind of condition with fingerprint A, thereby improve fingerprint identification's accuracy.
In the third aspect of the present application, as an optional implementation manner, the finger detection sensor is one of an optical detection sensor, an infrared detection sensor, an ultrasonic detection sensor, and a capacitance detection sensor.
A fourth aspect of the present application discloses a terminal device, comprising a memory and a processor, wherein the memory stores computer readable instructions, and the computer readable instructions, when executed by the processor, cause the processor to execute the capacitive fingerprint identification method disclosed in the first aspect of the present application.
The terminal equipment of the fourth aspect of the application can be through the angle of pressing according to finger detection information identification user's finger, or confirm according to at least two frames of fingerprint collection image and press the angle, and then can be according to pressing the angle and will type in advance second fingerprint image and first fingerprint image rotatory to same direction, so, just, can follow-up matching in-process, make the direction of second fingerprint image and first fingerprint image keep unanimous, thereby avoid fingerprint A and fingerprint B can not match successfully, but through rotating fingerprint B90 degrees after, fingerprint B can match successfully this kind of condition with fingerprint A, thereby improve fingerprint identification's accuracy.
A fifth aspect of the present application discloses a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the capacitive fingerprint identification method disclosed in the first embodiment of the present application.
The storage medium of the fourth aspect of the present application can be through the angle of pressing according to finger detection information identification user's finger, or confirm according to at least two frames of fingerprint collection images and press the angle, and then can rotate the second fingerprint image and the first fingerprint image of typing in advance to same direction according to pressing the angle, so, just can follow-up matching process, make the direction of second fingerprint image and first fingerprint image keep unanimous, thereby avoid fingerprint A and fingerprint B to be can not match successfully, but through rotating fingerprint B90 degrees after, fingerprint B can match successfully this kind of condition with fingerprint A, thereby improve fingerprint identification's accuracy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic flowchart of a capacitive fingerprint identification method disclosed in an embodiment of the present application;
FIG. 2 is a schematic diagram of a capacitive fingerprinting scenario disclosed in an embodiment of the present application;
FIG. 3 is a schematic diagram of a fingerprint image captured in a reduced fingerprint capture area according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a left-hand fingerprint of a user according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a right-hand fingerprint of a user according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a right-hand fingerprint of a user rotated and overlapped with a left-hand fingerprint of the user according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a right-hand fingerprint of a user according to an embodiment of the present disclosure;
FIG. 7A is a schematic diagram of a first frame of a three-frame fingerprint image disclosed in an embodiment of the present application;
FIG. 7B is a schematic diagram of a second frame of fingerprint images from among three frames of fingerprint images disclosed in an embodiment of the present application;
FIG. 7C is a schematic diagram of a third frame of fingerprint images from among the three frames of fingerprint images disclosed in the embodiments of the present application;
FIG. 8 is a schematic diagram of a change in centroid of a fingerprint in a three-frame fingerprint image as disclosed in an embodiment of the present application;
FIG. 9 is a schematic structural diagram of a capacitive fingerprint recognition apparatus according to an embodiment of the present disclosure;
FIG. 10 is a schematic structural diagram of a finger sensing device according to an embodiment of the present disclosure;
FIG. 10 is a schematic structural diagram of a finger sensing device according to an embodiment of the present disclosure;
FIG. 11 is a schematic diagram of a scenario in which a finger of a user presses a capacitive fingerprint sensor in a direction parallel to the capacitive fingerprint sensor according to an embodiment of the present application;
FIG. 12 is a schematic diagram of a scenario in which a finger of a user presses a capacitive fingerprint sensor in a direction perpendicular to the capacitive fingerprint sensor according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of a terminal device disclosed in an embodiment of the present application;
icon: capacitive fingerprint sensor 1000, finger detection sensor 200.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
Example one
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a capacitance fingerprint identification method according to an embodiment of the present disclosure. As shown in fig. 1, a capacitive fingerprint identification method according to an embodiment of the present application includes:
101. receiving a first fingerprint image of a capacitive fingerprint sensor and finger detection information generated by a finger detection sensor for a finger of a user;
102. identifying the pressing angle of the finger of the user according to the finger detection information, or determining the pressing angle according to at least two frames of fingerprint acquisition images, wherein the at least two frames of fingerprint acquisition images are acquired according to the finger pressing sequence of the user;
103. rotating a second fingerprint image and a first fingerprint image which are recorded in advance to the same direction according to the pressing angle;
104. and carrying out fingerprint matching on the first fingerprint image and the second fingerprint image in the same direction to obtain a matching result.
In the present embodiment, as an example of step 101, as shown in FIG. 2, when a user is placed on the capacitive fingerprint sensor, a first fingerprint image is formed by the difference in capacitance of the valleys and ridges in the finger on the lines of capacitances C1, C2.
The technical effects of the embodiments of the present application will be described in detail below with reference to the prior art.
In the prior art, with the lightness, thinness and miniaturization of various mobile terminals, the requirement for the occupied area of a capacitive fingerprint sensor is smaller and smaller, which results in less effective fingerprint acquisition area for matching, for example, as shown in fig. 3, a fingerprint image acquired by a reduced fingerprint acquisition area is more narrow and narrower and is not a complete fingerprint image, so that the texture information in the fingerprint image is reduced, and further the information required for matching the fingerprint is reduced, thereby improving the difficulty of fingerprint matching, for this situation, the prior art processes the acquired fingerprint image, including the fingerprint image acquired by rotation, so that in some cases, the matching can not be successful before rotation, and the matching can be successful after rotation, but this also causes a problem that some acquired fingerprint images are not matched with the fingerprint image recorded in advance in fact, however, the acquired fingerprint image can be successfully matched with the fingerprint image which is recorded in advance after being rotated, so that the wrong matching is caused, specifically, as shown in fig. 4 and 5, the fingerprint a is a left-hand fingerprint, and the fingerprint B is a right-hand fingerprint, in fact, the fingerprint a and the fingerprint B cannot be successfully matched, but as shown in fig. 6, the fingerprint B can be successfully matched with the fingerprint a after being rotated by 90 degrees.
In view of the above problems, the inventors found that the prior art can reduce such fingerprint matching errors and thus improve fingerprint recognition accuracy by improving the fingerprint rotation angle in rotating a fingerprint image, and particularly, as shown in the method of the embodiment of the present application, by recognizing the pressing angle of a user's finger according to finger detection information, or the pressing angle is determined according to at least two frames of fingerprint acquisition images, so that the second fingerprint image and the first fingerprint image which are recorded in advance can be rotated to the same direction according to the pressing angle, in this way, the orientation of the second fingerprint image and the first fingerprint image can be kept consistent in the subsequent matching process, thereby avoiding that the fingerprint A and the fingerprint B can not be successfully matched, but after the fingerprint B is rotated by 90 degrees, the fingerprint B can be successfully matched with the fingerprint A, so that the fingerprint identification accuracy is improved.
In the embodiment of the present application, as an exemplary illustration of step 102, the pressing angle may be identified according to the finger detection information, or determined according to at least two frames of fingerprint collection images. Specifically, the manner of identifying the pressing angle according to the finger detection information is applicable to two scenarios, i.e., when the user presses the capacitive fingerprint sensor in a direction parallel to the capacitive fingerprint sensor and in a direction perpendicular to the capacitive fingerprint sensor, for example, when the user presses the capacitive fingerprint sensor in a direction parallel to the capacitive fingerprint sensor, the finger of the user can be detected by the finger detection sensor needle and the pressing direction of the user is determined to be parallel to the capacitive fingerprint sensor, and when the user presses the capacitive fingerprint sensor in a direction perpendicular to the capacitive fingerprint sensor, the finger of the user cannot be detected by the finger detection sensor needle and the pressing direction of the user is determined to be perpendicular to the capacitive fingerprint sensor.
Please refer to the detailed description of the third embodiment of the present application for the specific detection process of the finger detection sensor, which is not described herein again.
Based on the above description, in the embodiment of the present application, as an optional implementation manner, the steps: identifying a pressing angle of the user's finger based on the finger detection information may include the sub-steps of:
and judging whether the finger of the user shields the detection sensor or not when pressing the capacitive fingerprint sensor according to the finger detection information, if so, determining that the pressing angle is that the finger of the user is parallel to the capacitive fingerprint sensor, and otherwise, determining that the pressing angle is that the finger of the user is perpendicular to the capacitive fingerprint sensor.
In the embodiment of the present application, as an optional implementation manner, the steps of: determining a compression angle from at least two frames of fingerprint captured images may comprise the sub-steps of:
determining the grain gravity center of each frame of fingerprint acquisition image;
and determining the pressing angle according to the direction change of the center of gravity between the center of gravity of the grains of the fingerprint acquisition image acquired at first and the center of gravity of the grains of the fingerprint acquisition image acquired at later.
As an exemplary illustration of the optional embodiment, as shown in fig. 7A, 7B, and 7C, assuming that the user puts the finger on the capacitive fingerprint sensor, at this time, the capacitive fingerprint sensor continuously senses the finger of the user, and then three frames of fingerprint collected images can be obtained, wherein, as shown in fig. 7A, 7B, and 7C, a center of gravity of a texture in the three frames of fingerprint collected images changes, wherein the change of the center of gravity of the texture is consistent with a change of a finger pressing direction when the user presses the capacitive fingerprint sensor, so as to be shown in fig. 8, the change of the finger pressing direction of the user can be restored according to the change of the center of gravity of the texture in the three frames of fingerprint collected images, and finally, the pressing angle is determined.
It should be noted that, in some embodiments, only the first frame of fingerprint acquisition image when the user presses the capacitive fingerprint sensor and the last frame of fingerprint acquisition image after the user presses the capacitive fingerprint sensor need to be acquired, and then the pressing angle can be identified according to the change of the gravity center of the texture in the first frame of fingerprint acquisition image and the last frame of fingerprint acquisition image
In the embodiment of the present application, as an optional implementation manner, the steps of: according to the centre of gravity direction change between the line focus of the fingerprint collection image of gathering earlier and the line focus of the fingerprint collection image of gathering later and confirm the angle of pressing, include:
calculating a vector difference between the grain gravity center of the fingerprint acquisition image acquired later and the grain gravity center of the fingerprint acquisition image acquired earlier, and taking the vector difference as the change of the gravity center direction;
and determining the pressing angle according to the vector difference.
In this application embodiment, through calculating the vector difference between the line focus of the fingerprint collection image of gathering at the back and the line focus of the fingerprint collection image of gathering at the front, and then can regard the vector difference as the focus direction change to can confirm according to the vector difference and press the angle.
Example two
Referring to fig. 9, fig. 9 is a schematic structural diagram of a capacitive fingerprint identification device disclosed in the embodiment of the present application. As shown in fig. 9, a capacitive fingerprint recognition apparatus according to an embodiment of the present application includes:
a receiving module 201, configured to receive a first fingerprint image of a capacitive fingerprint sensor and finger detection information generated by a finger detection sensor for a finger of a user;
the identification module 202 is configured to identify a pressing angle of a finger of a user according to the finger detection information, or determine the pressing angle according to at least two frames of fingerprint acquisition images, where the at least two frames of fingerprint acquisition images are acquired in sequence according to a finger pressing sequence of the user;
the image processing module 203 is used for rotating the second fingerprint image and the first fingerprint image which are recorded in advance in a rotating mode to the same direction according to the pressing angle;
the fingerprint matching module 204 is configured to perform fingerprint matching on the first fingerprint image and the second fingerprint image in the same direction, and obtain a matching result.
The device of this application embodiment is through the angle of pressing according to finger detection information identification user's finger, or confirm according to at least two frames fingerprint collection image and press the angle, and then can be according to pressing the angle and will type in advance second fingerprint image and first fingerprint image rotatory to same direction, so, just can follow-up matching in-process, make the direction of second fingerprint image and first fingerprint image keep unanimous, thereby avoid fingerprint A and fingerprint B to be can not match successfully, but through rotating fingerprint B90 degrees after, fingerprint B can match this kind of condition successfully with fingerprint A, thereby improve fingerprint identification's accuracy.
In the embodiment of the present application, as an optional implementation manner, the identifying module 202 includes:
and the judgment submodule is used for judging whether the finger of the user shields the detection sensor when pressing the capacitive fingerprint sensor according to the finger detection information, if so, determining that the pressing angle is that the finger of the user is parallel to the capacitive fingerprint sensor, and otherwise, determining that the pressing angle is that the finger of the user is perpendicular to the capacitive fingerprint sensor.
In the embodiment of the present application, as an optional implementation manner, the specific manner in which the identification module 202 determines the pressing angle according to at least two frames of fingerprint collected images is as follows:
determining the grain gravity center of each frame of fingerprint acquisition image;
and determining the pressing angle according to the direction change of the center of gravity between the center of gravity of the grains of the fingerprint acquisition image acquired at first and the center of gravity of the grains of the fingerprint acquisition image acquired at later.
In the embodiment of the present application, as an optional implementation manner, the identifying module 202 performs the steps of: according to the centre of gravity direction change between the line focus of the fingerprint collection image of gathering earlier and the line focus of the fingerprint collection image of gathering later and confirm the angle of pressing, include:
calculating a vector difference between the grain gravity center of the fingerprint acquisition image acquired later and the grain gravity center of the fingerprint acquisition image acquired earlier, and taking the vector difference as the change of the gravity center direction;
and determining the pressing angle according to the vector difference.
In this application embodiment, through calculating the vector difference between the line focus of the fingerprint collection image of gathering at the back and the line focus of the fingerprint collection image of gathering at the front, and then can regard the vector difference as the focus direction change to can confirm according to the vector difference and press the angle.
Please refer to the detailed description of the first embodiment of the present application for other descriptions related to the embodiments of the present application, which are not repeated herein.
EXAMPLE III
Referring to fig. 10, fig. 10 is a schematic structural diagram of a finger sensing device according to an embodiment of the present disclosure. As shown in fig. 10, a finger sensing apparatus according to an embodiment of the present application includes: a capacitive fingerprint sensor 1000 and a finger detection sensor 2000, wherein the finger detection sensor 2000 is disposed at both left and right sides of the capacitive fingerprint sensor 1000, for generating a first detection signal when a user's finger presses the capacitive fingerprint sensor 1000 in a direction parallel to the capacitive fingerprint sensor 1000. Further, the finger detecting sensor 2000 is also used to generate a second detection signal when the user's finger presses the capacitive fingerprint sensor 2000 in a direction perpendicular to the capacitive fingerprint sensor 1000.
Specifically, as an example, as shown in fig. 11, when a user presses the capacitive fingerprint sensor 1000 in a direction parallel to the capacitive fingerprint sensor 1000, a finger of the user may block the infrared sensor, and then the infrared sensor receives a strong light signal change, so that it can be determined that when the user presses the capacitive fingerprint sensor 1000 in a direction parallel to the capacitive fingerprint sensor 1000, and as shown in fig. 12, when the user presses the capacitive fingerprint sensor 1000 in a direction perpendicular to the capacitive fingerprint sensor 1000, the finger of the user cannot block the infrared sensor, and then the infrared sensor cannot receive the strong light signal change, but receives a floodlight signal, so that it can be determined that the user presses the capacitive fingerprint sensor 1000 in a direction perpendicular to the capacitive fingerprint sensor 1000.
In the embodiment of the present application, as an optional implementation manner, the finger detection sensor is one of an optical detection sensor, an infrared detection sensor, an ultrasonic detection sensor, and a capacitance detection sensor.
To sum up, the finger sensing device of the embodiment of the present application can be applied to the capacitance fingerprint identification method disclosed in the embodiment of the present application, and then can identify the pressing angle of the finger of the user according to the finger detection information, or determine the pressing angle according to at least two frames of fingerprint collection images, and then can rotate the second fingerprint image and the first fingerprint image, which are input in advance, to the same direction according to the pressing angle, so that the directions of the second fingerprint image and the first fingerprint image can be kept consistent in the subsequent matching process, thereby avoiding the situation that the fingerprint a and the fingerprint B cannot be successfully matched, but after rotating the fingerprint B by 90 degrees, the fingerprint B can be successfully matched with the fingerprint a, and thus improving the accuracy of fingerprint identification.
Example four
Referring to fig. 13, fig. 13 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 13, the terminal device includes a memory 301 and a processor 302, where the memory 301 stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the processor 302 is enabled to execute the capacitance fingerprint identification method disclosed in the first embodiment of the present application.
According to the method for recognizing the capacitance fingerprint, the terminal device can recognize the pressing angle of the finger of the user according to the finger detection information, or can determine the pressing angle according to at least two frames of fingerprint acquisition images, and further can rotate the pre-recorded second fingerprint image and the pre-recorded first fingerprint image to the same direction according to the pressing angle, so that the directions of the second fingerprint image and the first fingerprint image can be kept consistent in the subsequent matching process, and therefore the situation that the fingerprint A and the fingerprint B cannot be successfully matched is avoided, but the fingerprint B can be successfully matched with the fingerprint A after the fingerprint B is rotated by 90 degrees, and the accuracy of fingerprint recognition is improved.
EXAMPLE five
The embodiment of the application discloses a storage medium, wherein a computer program is stored on the storage medium, and when the computer program is executed by a processor, the capacitive fingerprint identification method disclosed by the embodiment of the application is realized.
The storage medium of the embodiment of the application can identify the pressing angle of the finger of the user according to the finger detection information by executing the capacitance fingerprint identification method, or can determine the pressing angle according to at least two frames of fingerprint acquisition images, and further can rotate the pre-recorded second fingerprint image and the pre-recorded first fingerprint image to the same direction according to the pressing angle, so that the directions of the second fingerprint image and the first fingerprint image can be kept consistent in the subsequent matching process, and the situation that the fingerprint A and the fingerprint B cannot be successfully matched is avoided, but the fingerprint B can be successfully matched with the fingerprint A after the fingerprint B is rotated by 90 degrees, and the accuracy of fingerprint identification is improved.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and 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 devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
In addition, 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.
Furthermore, the functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
It should be noted that the functions, if implemented in the form of software functional modules and sold or used as independent products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including 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 method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A capacitive fingerprinting method, characterized in that it comprises:
receiving a first fingerprint image of a capacitive fingerprint sensor and finger detection information generated by a finger detection sensor for a finger of the user;
identifying the pressing angle of the finger of the user according to the finger detection information, or determining the pressing angle according to at least two frames of fingerprint acquisition images, wherein the at least two frames of fingerprint acquisition images are acquired according to the finger pressing sequence of the user;
rotating a second fingerprint image and the first fingerprint image which are recorded in advance in a rotating mode to the same direction according to the pressing angle;
and fingerprint matching is carried out on the first fingerprint image and the second fingerprint image in the same direction, and a matching result is obtained.
2. The method of claim 1, wherein identifying a pressing angle of the user's finger based on the finger detection information comprises:
and judging whether the detection sensor is shielded or not when the finger of the user presses the capacitive fingerprint sensor according to the finger detection information, if so, determining that the pressing angle is that the finger of the user is parallel to the capacitive fingerprint sensor, and otherwise, determining that the pressing angle is that the finger of the user is perpendicular to the capacitive fingerprint sensor.
3. The method of claim 1, wherein determining the compression angle from at least two frames of fingerprinted images comprises:
determining the grain gravity center of each frame of the fingerprint acquisition image;
and determining the pressing angle according to the change of the gravity center direction between the grain gravity center of the fingerprint collection image collected firstly and the grain gravity center of the fingerprint collection image collected later.
4. The method of claim 1, wherein determining the compression angle based on a change in direction of a center of gravity between a textured center of gravity of the previously captured fingerprint capture image and a textured center of gravity of the subsequently captured fingerprint capture image comprises:
calculating a vector difference between a grain gravity center of the fingerprint acquisition image acquired later and a grain gravity center of the fingerprint acquisition image acquired earlier, and taking the vector difference as the change of the gravity center direction;
and determining the pressing angle according to the vector difference.
5. A capacitive fingerprint recognition apparatus, the apparatus comprising:
the receiving module is used for receiving a first fingerprint image of the capacitive fingerprint sensor and finger detection information generated by the finger detection sensor aiming at the finger of the user;
the identification module is used for identifying the pressing angle of the finger of the user according to the finger detection information or determining the pressing angle according to at least two frames of fingerprint acquisition images, and the at least two frames of fingerprint acquisition images are acquired according to the finger pressing sequence of the user;
the image processing module is used for rotating a second fingerprint image and the first fingerprint image which are recorded in advance in a rotating mode to the same direction according to the pressing angle;
and the fingerprint matching module is used for performing fingerprint matching on the first fingerprint image and the second fingerprint image in the same direction and obtaining a matching result.
6. The method of claim 5, wherein the identification module comprises:
and the judging submodule is used for judging whether the detection sensor is shielded or not when the finger of the user presses the capacitive fingerprint sensor according to the finger detection information, if so, determining that the pressing angle is that the finger of the user is parallel to the capacitive fingerprint sensor, and otherwise, determining that the pressing angle is that the finger of the user is perpendicular to the capacitive fingerprint sensor.
7. A finger sensing device, comprising a capacitive fingerprint sensor and finger detection sensors, wherein the finger detection sensors are arranged at the left and right sides of the capacitive fingerprint sensor for generating a first detection signal when a user's finger presses the capacitive fingerprint sensor in a direction parallel to the capacitive fingerprint sensor;
and the finger detecting sensor is further configured to generate a second detection signal when a finger of a user presses the capacitive fingerprint sensor in a direction perpendicular to the capacitive fingerprint sensor.
8. The finger sensing device of claim 7 wherein said finger detection sensor is one of an optical detection sensor, an infrared detection sensor, an ultrasonic detection sensor, a capacitive detection sensor.
9. A terminal device comprising a memory and a processor, the memory having stored therein computer-readable instructions that, when executed by the processor, cause the processor to perform the capacitive fingerprinting method of any one of claims 1-4.
10. A storage medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, carries out the capacitive fingerprinting method as claimed in any one of claims 1 to 4.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114973338A (en) * | 2022-06-16 | 2022-08-30 | 慧之安信息技术股份有限公司 | Sentinel position confirmation method based on fingerprint identification |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114973338A (en) * | 2022-06-16 | 2022-08-30 | 慧之安信息技术股份有限公司 | Sentinel position confirmation method based on fingerprint identification |
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