CN106951851B - Fingerprint template updating method and device - Google Patents
Fingerprint template updating method and device Download PDFInfo
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- CN106951851B CN106951851B CN201710154658.1A CN201710154658A CN106951851B CN 106951851 B CN106951851 B CN 106951851B CN 201710154658 A CN201710154658 A CN 201710154658A CN 106951851 B CN106951851 B CN 106951851B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1365—Matching; Classification
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- G—PHYSICS
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
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Abstract
The invention discloses a method and a device for updating a fingerprint template, and belongs to the technical field of information processing. The method comprises the following steps: and when the fingerprint template matched with the fingerprint characteristics of the user does not exist in the fingerprint template library, generating an alternative fingerprint template by adopting the fingerprint characteristics of the user, and recording the alternative fingerprint template in the alternative template library. When the alternative fingerprint template with the similarity larger than the preset threshold with the fingerprint template in the fingerprint template library exists in the alternative template library, the fingerprint template can be updated according to the alternative fingerprint template. The method provided by the invention can continuously update the fingerprint template in the process of fingerprint verification of the user, thereby improving the precision of the fingerprint template and further improving the accuracy of the fingerprint verification.
Description
Technical Field
The present invention relates to the field of information processing technologies, and in particular, to a method and an apparatus for updating a fingerprint template.
Background
With the rapid development of biometric technology, more and more devices are beginning to use fingerprint sensors to verify the identity of a user. The fingerprint sensor can collect the fingerprint characteristics of the same finger of a user for multiple times in advance, and a fingerprint template is generated according to the fingerprint characteristics obtained by the multiple times of collection.
In the related art, when a fingerprint sensor detects that newly acquired user fingerprint characteristics are matched with a certain pre-stored fingerprint template, verification can be confirmed to be passed; when the fingerprint sensor detects that the newly acquired user fingerprint features do not match the pre-stored fingerprint template, verification failure can be confirmed, and the newly acquired user fingerprint features are discarded.
However, when a user enters fingerprint features, the accuracy of the fingerprint template generated by the fingerprint sensor is low due to the influence of irregular actions or environmental temperature, and the like, so that the accuracy of the fingerprint sensor in verification according to the fingerprint template is low.
Disclosure of Invention
The invention provides a method and a device for updating a fingerprint template, which aim to solve the problem of low accuracy in fingerprint verification in the related art. The technical scheme is as follows:
in a first aspect, a method for updating a fingerprint template is provided, where the method includes:
when the fingerprint features of the user are collected, detecting whether a fingerprint template matched with the fingerprint features of the user exists in a fingerprint template library or not;
when the fingerprint template matched with the user fingerprint characteristics does not exist in the fingerprint template base, generating an alternative fingerprint template according to the user fingerprint characteristics, and recording the alternative fingerprint template in an alternative template base;
detecting whether an alternative fingerprint template with the similarity larger than a preset threshold with any fingerprint template in the fingerprint template library exists in the alternative template library;
and when the alternative fingerprint template with the similarity larger than a preset threshold value with the target fingerprint template in the fingerprint template library exists in the alternative template library, updating the target fingerprint template by adopting the alternative fingerprint template.
In a second aspect, an apparatus for updating a fingerprint template is provided, the apparatus comprising:
the first detection module is used for detecting whether a fingerprint template matched with the fingerprint characteristics of the user exists in a fingerprint template library or not when the fingerprint characteristics of the user are collected;
the recording module is used for generating an alternative fingerprint template according to the fingerprint characteristics of the user when the fingerprint template does not exist in the fingerprint template base, and recording the alternative fingerprint template in an alternative template base;
the second detection module is used for detecting whether the alternative template library has an alternative fingerprint template with the similarity larger than a preset threshold with any fingerprint template in the fingerprint template library;
and the first updating module is used for updating the target fingerprint template by adopting the alternative fingerprint template when the alternative fingerprint template with the similarity larger than a preset threshold value with the target fingerprint template in the fingerprint template library exists in the alternative template library.
The technical scheme provided by the invention has the beneficial effects that:
the invention provides a method and a device for updating a fingerprint template, wherein the method for updating the fingerprint template can be used for generating an alternative fingerprint template by adopting the fingerprint characteristics of a user when the fingerprint template matched with the fingerprint characteristics of the user does not exist in a fingerprint template library, and recording the alternative fingerprint template in the alternative template library. When the alternative fingerprint template with the similarity larger than the preset threshold with the fingerprint template in the fingerprint template library exists in the alternative template library, the fingerprint template can be updated according to the alternative fingerprint template. The method provided by the invention can continuously update the fingerprint template in the process of fingerprint verification of the user, thereby improving the precision of the fingerprint template and further improving the accuracy of the fingerprint verification.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for updating a fingerprint template according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for updating a target fingerprint template according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an apparatus for updating a fingerprint template according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another apparatus for updating a fingerprint template according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for updating a fingerprint template according to an embodiment of the present invention, and with reference to fig. 1, the method includes:
step 101, when the fingerprint features of the user are collected, detecting whether a fingerprint template matched with the fingerprint features of the user exists in a fingerprint template library.
When no fingerprint template matching with the fingerprint feature of the user exists in the fingerprint template library, step 102 may be executed; step 108 may be performed when the fingerprint template matching the fingerprint feature of the user exists in the fingerprint template library.
In the embodiment of the present invention, at least one fingerprint template is recorded in the fingerprint template library, and the at least one fingerprint template is a fingerprint template that is pre-stored in the fingerprint identification module and is used for verifying the fingerprint of the user. When the fingerprint identification template collects the fingerprint characteristics input by the user, the fingerprint characteristics of the user can be compared with each fingerprint template in the fingerprint template library one by one so as to detect whether the fingerprint template matched with the fingerprint characteristics of the user exists.
In an optional implementation manner, each fingerprint template may include a plurality of feature points, and after the fingerprint identification template acquires the user fingerprint features, image processing and feature extraction may be performed on the user fingerprint features to extract feature points in the user fingerprint features, and the extracted feature points are compared with the feature points in each fingerprint template. When the number of the repeated feature points in the user fingerprint feature and the fingerprint template is greater than a preset number threshold, the fingerprint identification module can determine that the user fingerprint feature is matched with the fingerprint template; when the number of the repeated feature points in the user fingerprint feature and each fingerprint template is not greater than the preset number threshold, the fingerprint identification module can determine that no fingerprint template matched with the user fingerprint feature exists in the fingerprint template library.
In another alternative implementation manner, each fingerprint template may include a fingerprint pattern, and after the fingerprint identification template acquires the fingerprint features of the user, the similarity between the fingerprint features of the user and the fingerprint patterns in each fingerprint template may be calculated. When the similarity between the fingerprint features of the user and the fingerprint patterns in the fingerprint template is greater than a preset similarity threshold, the fingerprint identification module can determine that the fingerprint features of the user are matched with the fingerprint template; when the similarity between the fingerprint features of the user and the fingerprint patterns in each fingerprint template is not greater than the preset similarity threshold, the fingerprint identification module may determine that no fingerprint template matching the fingerprint features of the user exists in the fingerprint template library.
It should be noted that, in addition to the above two implementation manners, the fingerprint identification module may also use other fingerprint identification algorithms to detect whether the fingerprint template exists in the fingerprint template library, which is not limited in the embodiment of the present invention.
And 102, detecting whether an alternative fingerprint template matched with the fingerprint characteristics of the user exists in an alternative template library.
The alternative fingerprint templates recorded in the alternative template library are all generated according to the collected alternative fingerprint characteristics, and the alternative fingerprint characteristics are not matched with the fingerprint templates in the fingerprint template library.
In the embodiment of the present invention, when there is no fingerprint template matching the user fingerprint feature in the fingerprint template library, the fingerprint identification module may further compare the user fingerprint feature with the alternative fingerprint templates in the alternative template library one by one, so as to detect whether there is an alternative fingerprint template matching the user fingerprint feature in the alternative template library. When the alternative template library does not have an alternative fingerprint template matching the fingerprint features of the user, the fingerprint identification module may execute step 103; when an alternative fingerprint template matching the user fingerprint feature exists in the alternative template library, the fingerprint identification module may execute step 104.
The specific process of the fingerprint identification module detecting whether the candidate fingerprint template matching the fingerprint feature of the user exists may refer to step 101, which is not described herein again.
And 103, generating an alternative fingerprint template according to the user fingerprint characteristics, and recording the alternative fingerprint template in the alternative template library. Step 105 is performed.
When the alternative template library does not have an alternative fingerprint template matched with the user fingerprint characteristics, the fingerprint identification module can generate a new alternative fingerprint template according to the user fingerprint characteristics and record the new alternative fingerprint template in the alternative template library.
And 104, updating the alternative fingerprint template by adopting the user fingerprint characteristics. Step 105 is performed.
When the alternative template library has the alternative fingerprint template matched with the user fingerprint feature, the fingerprint identification module can update the alternative fingerprint template matched with the user fingerprint feature by adopting the latest acquired user fingerprint feature. Specifically, the fingerprint identification module may add the newly added fingerprint features of the user fingerprint features to the matched alternative fingerprint template. The newly added fingerprint features refer to fingerprint features carried in the user fingerprint features and not recorded in the alternative fingerprint template.
And 105, detecting whether the alternative template library has an alternative fingerprint template with the similarity with any fingerprint template in the fingerprint template library larger than a preset threshold.
Further, the fingerprint identification module may compare each alternative fingerprint template in the alternative template library with each fingerprint template in the fingerprint template library one by one to detect whether there is an alternative fingerprint template in the alternative template library whose similarity with a certain fingerprint template is greater than a preset threshold. When there exists an alternative fingerprint template in the alternative template library, where the similarity between the alternative fingerprint template and the target fingerprint template in the fingerprint template library is greater than a preset threshold, the fingerprint identification module may perform step 106; when the similarity between the alternative fingerprint template in the alternative template library and each fingerprint template in the fingerprint template library is not greater than the preset threshold, the fingerprint identification module can end the operation, that is, the fingerprint identification module can wait for the user to input the fingerprint characteristics again.
It should be noted that, in the step 105, the fingerprint identification module may preferentially detect the alternative fingerprint template updated in the step 104, that is, detect whether the similarity between the updated alternative fingerprint template and a certain fingerprint template in the fingerprint template library is greater than a preset threshold.
And step 106, updating the target fingerprint template by adopting the alternative fingerprint template. Step 107 is performed.
In the embodiment of the present invention, if the similarity between a certain alternative fingerprint template in the alternative fingerprint module library and the target fingerprint template in the fingerprint template library is greater than the preset threshold, the fingerprint identification module may update the target fingerprint template with the alternative fingerprint template, so as to further improve the target fingerprint module and improve the accuracy of the fingerprint identification module in fingerprint verification.
Fig. 2 is a flowchart of a method for updating a target fingerprint template according to an embodiment of the present invention, and referring to fig. 2, a process of updating the target fingerprint template by the fingerprint identification module using an alternative fingerprint template may include:
In the embodiment of the present invention, when the candidate fingerprint template and the target fingerprint template have recorded equal feature points, the fingerprint identification module may respectively extract feature points in the candidate fingerprint template and the target fingerprint template, and detect whether new feature points not recorded in the target fingerprint template exist in the feature points of the candidate fingerprint template; when the alternative fingerprint template and the target fingerprint template are both recorded with fingerprint patterns, the fingerprint identification module can directly detect whether new fingerprint lines which are not recorded in the target fingerprint template exist in the fingerprint patterns of the alternative fingerprint template.
For example, the fingerprint identification module may add the new feature points or the new fingerprint lines to the target fingerprint template, thereby updating the target fingerprint template.
In the embodiment of the invention, after the fingerprint identification module detects that the matching between the fingerprint features input by the user and the fingerprint templates in the fingerprint template library fails, the alternative fingerprint template can be generated according to the fingerprint features of the user with the matching failure, and the alternative fingerprint template is stored in the alternative template library. When the fingerprint identification module detects the fingerprint features of the user with failed matching again, the fingerprint features of the user with failed matching can be compared with the alternative fingerprint templates in the alternative template library, and the alternative fingerprint templates can be updated and perfected according to the fingerprint features of the user with failed matching. When the updated alternative fingerprint template can be matched with a certain fingerprint template in the fingerprint template library, the fingerprint identification module can further update and perfect the fingerprint template according to the updated alternative fingerprint template. Compared with the prior art that the fingerprint template is updated only by adopting the successfully matched user fingerprint characteristics, the method provided by the embodiment of the invention greatly improves the updating efficiency of the fingerprint template.
Step 107, deleting the alternative fingerprint template from the alternative fingerprint template library.
And after the fingerprint identification module adopts the alternative fingerprint template to update the target fingerprint template in the fingerprint template library, the alternative fingerprint template can be deleted from the alternative fingerprint template library.
Step 108, updating the fingerprint template by using the fingerprint characteristics of the user.
In the step 101, if the fingerprint identification module detects that the fingerprint template matching the fingerprint feature of the user exists in the fingerprint template library, the fingerprint template can be directly updated by using the fingerprint feature of the user, so as to enrich the fingerprint feature in the fingerprint template and improve the identification accuracy.
It should be noted that, in the step 101 and the step 102, matching thresholds (for example, a preset number threshold or a preset similarity threshold) referred by the fingerprint identification module when detecting a matching template in the fingerprint template library or the candidate template library may be the same or different from each other, and the specific size of the matching threshold in each step is not limited in the embodiment of the present invention.
It should be further noted that, the order of the steps of the method for updating a fingerprint template provided in the embodiment of the present invention may be appropriately adjusted, and the steps may also be increased or decreased according to the situation. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure is covered by the protection scope of the present disclosure, and thus, the detailed description thereof is omitted.
In summary, the embodiments of the present invention provide an updating method of a fingerprint template, where the updating method may generate an alternative fingerprint template by using a user fingerprint feature when a fingerprint template matching the user fingerprint feature does not exist in a fingerprint template library, and record the alternative fingerprint template in an alternative template library. When the alternative fingerprint template with the similarity larger than the preset threshold with the fingerprint template in the fingerprint template library exists in the alternative template library, the fingerprint template can be updated according to the alternative fingerprint template. The method provided by the invention can continuously update the fingerprint template in the process of fingerprint verification of the user, thereby improving the precision of the fingerprint template and further improving the accuracy of the fingerprint verification.
Fig. 3 is a schematic structural diagram of an apparatus for updating a fingerprint template according to an embodiment of the present invention, and referring to fig. 3, the apparatus may include:
the first detection module 301 is configured to detect whether a fingerprint template matching the fingerprint feature of the user exists in the fingerprint template library when the fingerprint feature of the user is collected.
A recording module 302, configured to, when there is no fingerprint template matching the user fingerprint feature in the fingerprint template library, generate an alternative fingerprint template according to the user fingerprint feature, and record the alternative fingerprint template in an alternative template library.
The second detecting module 303 is configured to detect whether there is an alternative fingerprint template in the alternative template library, where a similarity between the alternative fingerprint template and any fingerprint template in the fingerprint template library is greater than a preset threshold.
A first updating module 304, configured to update the target fingerprint template with the alternative fingerprint template when there is an alternative fingerprint template in the alternative template library, where a similarity between the alternative fingerprint template and the target fingerprint template in the fingerprint template library is greater than a preset threshold.
Fig. 4 is a schematic structural diagram of another apparatus for updating a fingerprint template according to an embodiment of the present invention, and referring to fig. 4, the apparatus may further include:
a third detecting module 305, configured to detect whether an alternative fingerprint template matching the fingerprint feature of the user exists in the alternative template library.
The recording module 302 is specifically configured to generate an alternative fingerprint template according to the fingerprint feature of the user when the alternative fingerprint template matching the fingerprint feature of the user does not exist in the alternative template library.
The apparatus may further include:
a second updating module 306, configured to update the alternative fingerprint template with the user fingerprint feature when an alternative fingerprint template matching the user fingerprint feature exists in the alternative template library.
Optionally, the apparatus may further include:
a third updating module 307, configured to update the fingerprint template with the user fingerprint feature when there is a fingerprint template matching the user fingerprint feature in the fingerprint template library.
Optionally, the first updating module 304 may be specifically configured to:
detecting whether new fingerprint features which do not exist in the target fingerprint template exist in the alternative fingerprint template; when the new fingerprint feature exists in the alternative fingerprint template, the new fingerprint feature is added to the target fingerprint template.
Optionally, the first updating module 304 may be further configured to:
the alternative fingerprint template is deleted from the library of alternative fingerprint templates.
In summary, the embodiments of the present invention provide an updating apparatus for a fingerprint template, where the updating apparatus may generate an alternative fingerprint template by using a user fingerprint feature when there is no fingerprint template matching the user fingerprint feature in a fingerprint template library, and record the alternative fingerprint template in an alternative template library. When the alternative fingerprint template with the similarity larger than the preset threshold with the fingerprint template in the fingerprint template library exists in the alternative template library, the fingerprint template can be updated according to the alternative fingerprint template. The method provided by the invention can continuously update the fingerprint template in the process of fingerprint verification of the user, thereby improving the precision of the fingerprint template and further improving the accuracy of the fingerprint verification.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for updating a fingerprint template, the method comprising:
when the fingerprint features of the user are collected, detecting whether a fingerprint template matched with the fingerprint features of the user exists in a fingerprint template library or not;
when the fingerprint template matched with the user fingerprint characteristics does not exist in the fingerprint template base, generating an alternative fingerprint template according to the user fingerprint characteristics, and recording the alternative fingerprint template in an alternative template base;
detecting whether an alternative fingerprint template with the similarity larger than a preset threshold with any fingerprint template in the fingerprint template library exists in the alternative template library;
when the alternative template library has an alternative fingerprint template with the similarity with a target fingerprint template in the fingerprint template library larger than a preset threshold, updating the target fingerprint template by using the alternative fingerprint template;
the generating of the alternative fingerprint template according to the user fingerprint features comprises:
when the alternative template library does not have an alternative fingerprint template matched with the user fingerprint characteristics, generating an alternative fingerprint template according to the user fingerprint characteristics;
the method further comprises the following steps:
and when the alternative template library has the alternative fingerprint template matched with the user fingerprint characteristics, updating the alternative fingerprint template by adopting the user fingerprint characteristics.
2. The method of claim 1, wherein prior to generating an alternative fingerprint template from the user fingerprint features, the method further comprises:
and detecting whether the alternative fingerprint template matched with the user fingerprint feature exists in the alternative template library.
3. The method of claim 1, wherein after detecting whether a fingerprint template matching the user fingerprint feature exists in a fingerprint template library, the method further comprises:
and when a fingerprint template matched with the user fingerprint characteristics exists in the fingerprint template library, updating the fingerprint template by adopting the user fingerprint characteristics.
4. The method according to any one of claims 1 to 3, wherein the updating the target fingerprint template with the alternative fingerprint template comprises:
detecting whether new fingerprint features which do not exist in the target fingerprint template exist in the alternative fingerprint template;
when the new fingerprint features exist in the alternative fingerprint template, adding the new fingerprint features to the target fingerprint template.
5. A method according to any one of claims 1 to 3, wherein after updating the target fingerprint template with the alternative fingerprint template, the method further comprises:
and deleting the alternative fingerprint template from the alternative fingerprint template library.
6. An apparatus for updating a fingerprint template, the apparatus comprising:
the first detection module is used for detecting whether a fingerprint template matched with the fingerprint characteristics of the user exists in a fingerprint template library or not when the fingerprint characteristics of the user are collected;
the recording module is used for generating an alternative fingerprint template according to the user fingerprint characteristics and recording the alternative fingerprint template in an alternative template library when the fingerprint template matched with the user fingerprint characteristics does not exist in the fingerprint template library;
the second detection module is used for detecting whether the alternative template library has an alternative fingerprint template with the similarity larger than a preset threshold with any fingerprint template in the fingerprint template library;
the first updating module is used for updating the target fingerprint template by adopting the alternative fingerprint template when the alternative fingerprint template with the similarity larger than a preset threshold value with the target fingerprint template in the fingerprint template library exists in the alternative template library;
the recording module is used for generating an alternative fingerprint template according to the user fingerprint characteristics when the alternative fingerprint template matched with the user fingerprint characteristics does not exist in the alternative template library;
the device further comprises:
and the second updating module is used for updating the alternative fingerprint template by adopting the user fingerprint characteristics when the alternative fingerprint template matched with the user fingerprint characteristics exists in the alternative template library.
7. The apparatus of claim 6, further comprising:
and the third detection module is used for detecting whether the alternative fingerprint template matched with the fingerprint characteristics of the user exists in the alternative template library.
8. The apparatus of claim 6, further comprising:
and the third updating module is used for updating the fingerprint template by adopting the fingerprint characteristics of the user when the fingerprint template matched with the fingerprint characteristics of the user exists in the fingerprint template library.
9. The apparatus according to any one of claims 6 to 8, wherein the first updating module is configured to:
detecting whether new fingerprint features which do not exist in the target fingerprint template exist in the alternative fingerprint template;
when the new fingerprint features exist in the alternative fingerprint template, adding the new fingerprint features to the target fingerprint template.
10. The apparatus of any one of claims 6 to 8, wherein the first updating module is further configured to:
and deleting the alternative fingerprint template from the alternative fingerprint template library.
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| CN101794386A (en) * | 2010-03-24 | 2010-08-04 | 成都方程式电子有限公司 | Fingerprint identification system and method for resisting remaining fingerprint |
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: Qingdao Hisense Mobile Communication Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE MOBILE COMMUNICATIONS TECHNOLOGY Co.,Ltd. |