WO2017091933A1

WO2017091933A1 - Fingerprint acquisition method, device, and electronic apparatus

Info

Publication number: WO2017091933A1
Application number: PCT/CN2015/095939
Authority: WO
Inventors: 牛溢华; 金锋
Original assignee: 宇龙计算机通信科技(深圳)有限公司
Priority date: 2015-11-30
Filing date: 2015-11-30
Publication date: 2017-06-08

Abstract

A fingerprint acquisition method, device, and electronic apparatus. The method comprises: capturing multiple fingerprint image frames while a finger of a user is sliding across a fingerprint sensor (S101); performing predetermined stitching processing on the multiple fingerprint image frames (S102); and extracting feature points from a user fingerprint obtained from the stitching, so as to obtain a user fingerprint feature (S103). Compared with acquiring a fingerprint by means of pressing, the provided fingerprint acquisition solution based on sliding (recording a fingerprint by sliding a finger) enables better continuity of the obtained image frames which generally include essential and proper overlapping regions, thereby reducing the likelihood of recording an isolated and invalid fingerprint, and effectively overcoming the issue of recording invalid images in the pressing technique. In addition, multiple continuous image frames can be obtained during one sliding process, and therefore, complete and comprehensive fingerprint information can be obtained without multiple repeated recording operations, thereby reducing the number of times that a user has to operate a sensor while providing a high recognition rate, and accordingly creating better user experience.

Description

Fingerprint collection method, device and electronic device

Technical field

The invention belongs to the technical field of fingerprint collection and processing, and in particular relates to a fingerprint collection method, device and electronic device.

Background technique

Fingerprint recognition technology is currently the most widely used biometric recognition technology. The technology realizes fingerprint recognition based on various feature points such as endpoints, bifurcation points, bifurcation points, isolated points, ring points and short lines contained in the fingerprint. Currently, some high-end mobile phones, tablets and other electronic devices have integrated fingerprint recognition.

The fingerprint identification technology includes fingerprint collection (refers to acquiring fingerprint images and extracting fingerprint features, including collection of fingerprint templates during registration and collection of subsequent fingerprints to be recognized), and matching and identification of fingerprints. The prior art generally collects fingerprints based on a pressed fingerprint sensor, and the pressing fingerprint collection is easy to generate an invalid fingerprint input problem, such as no overlap between fingerprint areas pressed multiple times, that is, an island fingerprint, or an overlapping area is too large, etc. The complete fingerprint is spliced, which causes the user to press the sensor multiple times to collect the fingerprint information that meets the normal demand. For example, for a sensor with a large sensing area (the larger the sensor area, the more fingerprint information is acquired by a single press. ), a fingerprint collection generally requires the user to press 5-6 times, and for a sensor with a smaller sensing area, more pressing operations are required, such as sometimes it may require the user to perform up to 20 presses to obtain a complete Fingerprint information.

It can be seen that the existing fingerprint-based fingerprint collection scheme has the following problems: the required number of user input is large, especially the sensor with a small fingerprint sensing area, and is prone to occur when the number of user input operations is small. The problem of low recognition rate.

Summary of the invention

In view of the above, the object of the present invention is to provide a fingerprint collection method, device and electronic device, which aim to solve the above problems existing in the prior art, and realize that the user needs to operate when the fingerprint collection is effectively reduced under the premise of supporting a higher recognition rate. The number of sensors.

In order to solve the above technical problems, the present invention discloses the following technical solutions:

A fingerprint collection method is applied to an electronic device, the electronic device includes a fingerprint sensor, and the method includes:

Obtaining a multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor;

Performing a preset splicing process on the multi-frame fingerprint image to obtain a user fingerprint;

Feature point extraction is performed on the user fingerprint to obtain a user fingerprint feature.

In the above method, preferably, the multi-frame fingerprint image generated when the user finger is slid on the fingerprint sensor includes:

A multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor is periodically captured based on the set time interval.

In the above method, preferably, the performing the splicing processing on the multi-frame fingerprint image comprises:

The fingerprint image of each frame is spliced based on the overlapping fingerprint regions between the fingerprint images.

The above method, preferably, further includes:

Determining whether the fingerprint of the user reaches a preset standard;

If the preset criterion is reached, encrypting and storing the fingerprint template formed by the user fingerprint feature of the user fingerprint, or identifying the user fingerprint based on the user fingerprint feature;

If the preset criteria are not met, the user is prompted to continue to enter the fingerprint.

In the above method, preferably, determining whether the user fingerprint reaches a preset standard comprises:

Determining whether the user fingerprint meets the following condition: the texture definition of the user fingerprint reaches a preset definition threshold, and the number of feature points included in the user fingerprint reaches a preset value.

A fingerprint collection device is applied to an electronic device, the electronic device includes a fingerprint sensor, and the device includes:

An acquiring module, configured to acquire a multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor;

a splicing processing module, configured to perform preset splicing processing on the multi-frame fingerprint image to obtain a user fingerprint;

The feature point extraction module is configured to perform feature point extraction on the user fingerprint to obtain a user fingerprint feature.

Preferably, the acquiring module includes:

The image capturing unit is configured to periodically capture a multi-frame fingerprint image generated when the user's finger slides on the fingerprint sensor based on the set time interval.

Preferably, the splicing processing module includes:

An image splicing unit, configured to splicing each frame based on an overlapping fingerprint area between the fingerprint images Fingerprint image.

The device, preferably, further includes a judgment processing module, where the judgment processing module includes:

a determining unit, configured to determine whether the fingerprint of the user reaches a preset standard;

a first processing unit, configured to: when the preset criterion is reached, encrypt and store a fingerprint template formed by a user fingerprint feature of the user fingerprint, or identify the user fingerprint based on the user fingerprint feature;

The second processing unit is configured to prompt the user to continue to input the fingerprint when the preset criterion is not reached.

Preferably, the determining unit comprises:

The determining subunit is configured to determine whether the user fingerprint meets the following condition: the texture definition of the user fingerprint reaches a preset definition threshold, and the number of feature points included in the user fingerprint reaches a preset value.

An electronic device, including a fingerprint sensor, further comprising a fingerprint collection device as described above.

According to the above solution, the fingerprint collection method disclosed in the present application includes: acquiring a multi-frame fingerprint image when a user's finger slides on the fingerprint sensor; performing preset splicing processing on the multi-frame fingerprint image; and performing splicing the obtained user fingerprint Feature point extraction to obtain user fingerprint features. It can be seen that the present application provides a fingerprint collection scheme based on a sliding mode (sliding input fingerprint). Compared with the pressing method, the images acquired by the sliding mode have good continuity, and generally there is a necessary and suitable overlapping area, which is difficult. The island fingerprint appears, which effectively overcomes the invalid entry problem in the pressing mode, and can obtain a multi-frame continuous image in one sliding process, and can obtain relatively complete and comprehensive fingerprint information without repeated recording, so that the application can be realized in support Under the premise of high recognition rate, the number of times the user operates the sensor is effectively reduced, and the user experience is better.

DRAWINGS

1 is a flowchart of a fingerprint collection method according to Embodiment 1 of the present invention;

2 is a flowchart of a fingerprint collection method according to Embodiment 2 of the present invention;

FIG. 4 is a schematic structural diagram of a fingerprint collection device according to Embodiment 3 of the present invention.

detailed description

For a better understanding of the present invention, the preferred embodiments of the present invention are described in conjunction with the embodiments of the invention. Limitations of the claims of the present invention.

Embodiment 1

A first embodiment of the present invention provides a fingerprint collection method, which can be applied to an electronic device including a fingerprint sensor, such as a smart phone, a tablet computer, a notebook computer, and the like. Referring to FIG. 1, the method may include the following steps. :

S101: Acquire a multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor.

The present application solves the problems of low recognition rate and large number of user input times in the existing push-type fingerprint collection scheme by providing a fingerprint collection scheme based on a sliding mode (sliding input fingerprint).

The fingerprint sensor used in the fingerprint acquisition of the present application may specifically be a capacitive fingerprint recognition sensor. The fingerprint sensor periodically captures the fingerprint image of the user during the sliding of the user's finger within the effective sensing area of the fingerprint sensor. The time interval used by the fingerprint sensor to periodically capture the fingerprint image may be set by the technician in advance based on the continuity requirement between the multi-frame images captured by one sliding process, and combined with the performance of the sensor, and the set time interval is set. In a process of sliding the finger as much as possible, it is possible to capture a set of consecutive images in which there is a certain degree of fingerprint pattern overlap between adjacent images (there is an overlapping area, but the overlapping area is not too large).

In this embodiment, the fingerprint sensor adopts a time interval of 20 ms to periodically capture a fingerprint image. For a sliding operation of the user, the sensor can obtain a continuous multi-frame fingerprint image by periodically capturing, so that when the fingerprint is entered, the user only needs to By sliding the finger over the effective sensing area of the sensor, sliding down, sliding left and right, etc., the sensor can capture all the fingerprint information of the sliding area. In theory, the application of the present application can be obtained by only one sliding operation. To fingerprint information that meets daily usage needs.

S102: Perform preset splicing processing on the multi-frame fingerprint image to obtain a user fingerprint.

For a set of consecutive fingerprint images obtained by the fingerprint sensor by periodically capturing, the fingerprint images may be spliced according to the overlapping fingerprint regions between adjacent images (ie, the same fingerprint lines between adjacent images). , a relatively complete user fingerprint containing more fingerprint information can be obtained.

S103: Perform feature point extraction on the user fingerprint to obtain a user fingerprint feature.

After splicing to obtain a relatively complete user fingerprint, this step continues to extract feature points of the user fingerprint, for example, extracting an endpoint, a bifurcation point, a bifurcation point, an isolated point, and a ring included in the user fingerprint. Various feature points such as points and short lines are finally collected, and the extracted feature points are finally collected to obtain a feature point set of the user fingerprint, thereby realizing user fingerprint collection.

Embodiment 2

The second embodiment continues to supplement the solution of the first embodiment. Referring to FIG. 2, in the embodiment, the fingerprint collection method may further include the following steps:

S104: Determine whether the fingerprint of the user reaches a preset standard.

S105: If the preset criterion is reached, encrypting and storing a fingerprint template formed by a user fingerprint feature of the user fingerprint, or identifying the user fingerprint based on the user fingerprint feature;

S106: If the preset criterion is not reached, the user is prompted to continue to input the fingerprint.

After feature extraction is performed on the user fingerprint obtained by the splicing, and the fingerprint is collected, the embodiment continues to determine whether the collected user fingerprint is complete and up to standard based on the preset fingerprint standard, specifically, for example, determining the texture definition of the user fingerprint. Whether the preset definition threshold is reached, and whether the number of feature points included in the user's fingerprint reaches a preset value or the like.

If the result of the determination is that the preset standard is reached, the fingerprint of the collected user fingerprint contains sufficient fingerprint information, so that the collected fingerprint feature information can be processed according to actual needs, for example, in the registration mode, the encrypted storage is performed by the The fingerprint template formed by the fingerprint feature information can be fingerprinted by matching the fingerprint feature information collected this time with the previously collected fingerprint template.

If the judgment result is that the preset criterion is not reached, the user fingerprint representing the collection fails to contain sufficient fingerprint information, so that the user can be prompted to continue to input the fingerprint, and then the fingerprint is recorded by combining two or three times. Entering the captured fingerprint information to obtain relatively complete fingerprint information. In theory, the application can obtain fingerprint information that meets daily use requirements with only one swipe, and in a few special cases, such as the user's finger at the sensor. Sensing the edge area to slide, or the user's finger and the sensor are not fully contacted during sliding, etc., and more complete fingerprint information can be captured by sliding 2-3 times.

Embodiment 3

This embodiment discloses a fingerprint collection device, which corresponds to the fingerprint collection method disclosed in the above embodiments.

Corresponding to the first embodiment, referring to FIG. 3, the fingerprint collection device may include an acquisition module 100, a splicing processing module 200, and a feature point extraction module 300.

The obtaining module 100 is configured to acquire a multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor.

The acquiring module 100 includes an image capturing unit, configured to periodically capture a multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor based on a set time interval.

The splicing processing module 200 is configured to perform preset splicing processing on the multi-frame fingerprint image to obtain a user fingerprint.

The splicing processing module 200 includes an image splicing unit for splicing the fingerprint images of each frame based on the overlapping fingerprint regions between the fingerprint images.

The feature point extraction module 300 is configured to perform feature point extraction on the user fingerprint to obtain a user fingerprint feature.

Corresponding to the second embodiment, referring to FIG. 4, the fingerprint collection device may further include a determination processing module 400, where the module includes a determination unit, a first processing unit, and a second processing unit.

The determining unit includes: a determining subunit, configured to determine whether the user fingerprint meets the following condition: the texture definition of the user fingerprint reaches a preset definition threshold, and the number of feature points included in the user fingerprint The preset value is reached.

For the fingerprint collection device disclosed in the third embodiment of the present invention, since it corresponds to the fingerprint collection methods disclosed in the first embodiment to the second embodiment, the description is relatively simple. For related similarities, refer to the first embodiment to the second embodiment. The description of the fingerprint collection method section can be omitted, and will not be described in detail here.

Embodiment 4

The fourth embodiment of the present invention discloses an electronic device, which may be a smart phone, a tablet computer, a notebook computer, and the like. The electronic device includes a fingerprint sensor, and further includes a fingerprint collection device as provided in the third embodiment.

In summary, the present application has the following advantages: a fingerprint acquisition scheme based on a sliding mode (sliding fingerprint input) is realized, and a continuous multi-frame fingerprint image can be obtained for a sliding operation of a user's finger, and a fingerprint is collected by using a sliding process. The continuity of the fingerprint information enables complete capture of the fingerprint information, thereby greatly reducing the number of times the sensor needs to be operated when the fingerprint is entered, while supporting a higher recognition rate, and bringing a better user experience to the fingerprint recognition function of the electronic device. Moreover, the present application can be widely applied to fingerprint sensors of various sizes, and particularly when applied to a small-sized fingerprint sensor, the advantages of the present application are more apparent.

It should be noted that each embodiment in the specification is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the embodiments are referred to each other. can.

For the convenience of description, the above devices are described as being divided into various modules or units by functions. Of course, the functions of each module and unit may be implemented in the same software or software and/or hardware when implementing the present application.

It will be apparent to those skilled in the art from the above description of the embodiments that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product in essence or in the form of a software product, which may be stored in a storage medium such as a ROM/RAM or a disk. , an optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present application or portions of the embodiments.

Finally, it should also be noted that in this context, relational terms such as first, second, third, fourth, etc. are only used to distinguish one entity or operation from another entity or operation, and not Any such actual relationship or order between these entities or operations must be required or implied. Furthermore, the term "comprises" or "comprises" or "comprises" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

A fingerprint collection method is characterized in that it is applied to an electronic device, and the electronic device includes a fingerprint sensor, and the method includes:

Obtaining a multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor;

Performing a preset splicing process on the multi-frame fingerprint image to obtain a user fingerprint;

Feature point extraction is performed on the user fingerprint to obtain a user fingerprint feature.
The method according to claim 1, wherein the acquiring a multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor comprises:

A multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor is periodically captured based on the set time interval.
The method according to claim 1, wherein the performing a predetermined splicing process on the multi-frame fingerprint image comprises:

The fingerprint image of each frame is spliced based on the overlapping fingerprint regions between the fingerprint images.
The method of claim 1 further comprising:

Determining whether the fingerprint of the user reaches a preset standard;

If the preset criterion is reached, encrypting and storing the fingerprint template formed by the user fingerprint feature of the user fingerprint, or identifying the user fingerprint based on the user fingerprint feature;

If the preset criteria are not met, the user is prompted to continue to enter the fingerprint.
The method according to claim 4, wherein the determining whether the user fingerprint reaches a preset criterion comprises:

Determining whether the user fingerprint meets the following condition: the texture definition of the user fingerprint reaches a preset definition threshold, and the number of feature points included in the user fingerprint reaches a preset value.
A fingerprint collection device is characterized in that it is applied to an electronic device, the electronic device includes a fingerprint sensor, and the device includes:

An acquiring module, configured to acquire a multi-frame fingerprint image generated when a user's finger slides on the fingerprint sensor;

a splicing processing module, configured to perform preset splicing processing on the multi-frame fingerprint image to obtain a user fingerprint;

a feature point extraction module, configured to perform feature point extraction on the user fingerprint, and obtain a user fingerprint Sign.
The device according to claim 6, wherein the obtaining module comprises:

The image capturing unit is configured to periodically capture a multi-frame fingerprint image generated when the user's finger slides on the fingerprint sensor based on the set time interval.
The device according to claim 6, wherein the splicing processing module comprises:

The image splicing unit is configured to splicing the fingerprint images of each frame based on the overlapping fingerprint regions between the fingerprint images.
The device according to claim 6, further comprising a judgment processing module, wherein the judgment processing module comprises:

a determining unit, configured to determine whether the fingerprint of the user reaches a preset standard;

a first processing unit, configured to: when the preset criterion is reached, encrypt and store a fingerprint template formed by a user fingerprint feature of the user fingerprint, or identify the user fingerprint based on the user fingerprint feature;

The second processing unit is configured to prompt the user to continue to input the fingerprint when the preset criterion is not reached.
The device according to claim 9, wherein the determining unit comprises:

The determining subunit is configured to determine whether the user fingerprint meets the following condition: the texture definition of the user fingerprint reaches a preset definition threshold, and the number of feature points included in the user fingerprint reaches a preset value.
An electronic device, comprising a fingerprint sensor, further comprising a fingerprint collection device according to any one of claims 6-10.