CN105718214A - Access method and device for fingerprint mask image - Google Patents
Access method and device for fingerprint mask image Download PDFInfo
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- CN105718214A CN105718214A CN201510688243.3A CN201510688243A CN105718214A CN 105718214 A CN105718214 A CN 105718214A CN 201510688243 A CN201510688243 A CN 201510688243A CN 105718214 A CN105718214 A CN 105718214A
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- mask image
- boundary information
- masked areas
- fingerprint
- code following
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0608—Saving storage space on storage systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/0643—Management of files
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Abstract
The invention is suitable for the technical field of fingerprint recognition and provides an access method and device for a fingerprint mask image. The method comprises the following steps: obtaining boundary information of a mask region in the fingerprint mask image; storing the boundary information into a file; when the fingerprint mask image needs to be transferred, reading the boundary information in the file; and restoring the fingerprint mask image according to the boundary information. According to the access scheme for the fingerprint mask image, on one hand, the occupied storage space is extremely small and storage resources are well saved; and on the other hand, the fingerprint mask image can still be restored at original accuracy, so that the recognition accuracy of a whole fingerprint recognition system is ensured; and the balance between the space occupation and the storage accuracy in the access process of the fingerprint mask image is well achieved.
Description
Technical field
The invention belongs to fingerprint identification technology field, particularly relate to access method and the device of fingerprint mask image.
Background technology
In recent years, fingerprint identification technology has been successfully applied to the every field of social life, for instance, the technical field such as smart mobile phone, gate control system, ecommerce, attendance checking system, payment mechanism and identity authentication.In the work process of fingerprint recognition system, need from fingerprint image, be partitioned into fingerprint mask image and store, so that performing the sequence of operations such as the image enhaucament of fingerprint image, orientation field computation, binaryzation and feature extraction subsequently through reading fingerprint mask image, to obtain more accurate fingerprint recognition result.
The access method of fingerprint mask image conventional at present includes: directly fingerprint mask image is saved in file as a binary system array and is directly read, and after fingerprint mask image is sampled, sampled result be saved in file and read by interpolation method, the former is owing to being fully retained the precision of fingerprint mask image, make to preserve file excessive, the consuming of storage resource is increased, and the latter reduces the precision of fingerprint mask image, thus also the arithmetic accuracy of fingerprint recognition being created impact.
Summary of the invention
In view of this, embodiments provide access method and the device of fingerprint mask image, to solve the problem that existing fingerprint mask image access method cannot realize space hold and storage both precision balance.
First aspect, it is provided that the access method of a kind of fingerprint mask image, including:
Obtain the boundary information of masked areas in fingerprint mask image；
Described boundary information is saved in file；
When needs call described fingerprint mask image, read the described boundary information in described file；
Described fingerprint mask image is restored according to described boundary information.
Second aspect, it is provided that the access device of a kind of fingerprint mask image, including:
Acquiring unit, for obtaining the boundary information of masked areas in fingerprint mask image；
Storage unit, for being saved in described boundary information in file；
Read unit, for when needs call described fingerprint mask image, reading the described boundary information in described file；
Restoration unit, for restoring described fingerprint mask image according to described boundary information.
The access plan of the fingerprint mask image that the embodiment of the present invention provides, on the one hand that taking of memory space is minimum, save storage resource well, still can restore fingerprint mask image with original precision on the other hand, thus ensure that the accuracy of identification of whole fingerprint recognition system, solve space hold and storage precision balance therebetween in fingerprint mask image access procedure well.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flowchart of the access method of the fingerprint mask image that the embodiment of the present invention provides；
Fig. 2 is the fingerprint image exemplary plot that the embodiment of the present invention provides；
Fig. 3 is the fingerprint mask image exemplary plot that the embodiment of the present invention provides；
Fig. 4 is the mask border exemplary plot of the fingerprint mask image that the embodiment of the present invention provides；
Fig. 5 be the embodiment of the present invention provide fingerprint mask image access method S101 implement flow chart；
Fig. 6 be the embodiment of the present invention provide fingerprint mask image access method S104 implement flow chart；
Fig. 7 is the structured flowchart of the access device of the fingerprint mask image that the embodiment of the present invention provides.
Detailed description of the invention
In order to technical solutions according to the invention are described, illustrate below by specific embodiment.In being described below, in order to illustrate rather than in order to limit, it is proposed that the such as detail of particular system structure, technology etc, in order to thoroughly cut and understand the embodiment of the present invention.But, it will be clear to one skilled in the art that and can also realize the present invention in the other embodiments do not have these details.In other situation, omit the detailed description to well-known system, device, circuit and method, in order to avoid unnecessary details hinders description of the invention.
What Fig. 1 illustrated the access method of the fingerprint mask image that the embodiment of the present invention provides realizes flow process, and details are as follows:
In S101, obtain the boundary information of masked areas in fingerprint mask image.
In the present embodiment, first pass through fingerprint sensor and collect fingerprint image as shown in Figure 2, and further this fingerprint image is split, obtain the fingerprint mask images of this fingerprint image as shown in Figure 3.Described fingerprint mask image is bianry image, such as, if the pixel value comprising the region of finger print information in fingerprint mask image is 0, the pixel value then not comprising the region of finger print information is 1, otherwise, if the pixel value comprising the region of finger print information in fingerprint mask image is 1, then the pixel value not comprising the region of finger print information is 0.And the boundary information of masked areas, what can express is the bianry image that contains only masked areas border in fingerprint mask image, such as, the pixel value on masked areas border is 0, then the pixel value in other region is 1, otherwise, the pixel value on masked areas border is 1, then the pixel value in other region is 0, therefore, boundary information according to masked areas, it is possible to draw out the bianry image about masked areas border as shown in Figure 4.
In embodiments of the present invention, the boundary information of described masked areas, include but not limited to the information such as directional chain-code and boundary image on the coordinate of any point on the origin coordinates on masked areas border, border, border.
As one embodiment of the present of invention, in S101, the acquisition process of the boundary information of masked areas can be realized by mode as shown in Figure 5:
In S501, position the described origin coordinates of described masked areas.
In the present embodiment, it is possible to the pixel coordinate of first masked areas accessed is defined as the origin coordinates of this masked areas.Further, the pixel of this first masked areas accessed can be searched by the mode of traversal fingerprint mask image, the path of traversal includes but not limited to: travel through from top to bottom from left to right from the upper left corner of fingerprint mask image, travel through from top to bottom from right to left from the upper right corner of fingerprint mask image, travel through from bottom to top from left to right from the lower left corner of fingerprint mask image, or travel through from bottom to top from right to left from the lower right corner of fingerprint mask image, until first time have access to pixel value by 0 to 1 or by 1 to 0 catastrophe point, and this point is defined as the origin coordinates of masked areas.
In S502, from described origin coordinates, described masked areas is carried out chain code following, until again navigating to the described origin coordinates of described masked areas.
In S503, obtain the directional chain-code of the described masked areas produced in described chain code following process.
After the origin coordinates getting masked areas, from this origin coordinates, adopt chain code following algorithm that masked areas is carried out chain code following, till again running into this origin coordinates, whole chain code following process can obtain the directional chain-code of a series of masked areas according to the path followed the tracks of, and the directional chain-code of acquisition and origin coordinates have together constituted with the boundary information that masked areas is most basic.
As one embodiment of the present of invention, described chain code following includes the chain code following of 4 connections or the chain code following of 8 connections.
As another embodiment of the present invention, described chain code following includes clockwise chain code following or chain code following counterclockwise.
In S102, described boundary information is saved in file.
After the boundary information getting masked areas, for fingerprint mask image, only this boundary information is saved in preassigned file in the present embodiment, call for subsequent fingerprint identification system, the direct scheme being undertaken fingerprint mask image preserving compared in prior art, the preservation process of the embodiment of the present invention is minimum to taking of memory space, has saved storage resource well.
In S103, when needs call described fingerprint mask image, read the described boundary information in described file.
In S104, restore described fingerprint mask image according to described boundary information.
When needs call fingerprint mask image, such as, when needing fingerprint user inputted to mate with the fingerprint template preserved in system, from preassigned file, then read out the boundary information of masked areas in the fingerprint mask image pre-saved, restore the fingerprint mask image needed for fingerprint comparison further according to this boundary information.
As shown in Figure 6, the process according to boundary information recovery fingerprint mask image is as follows:
In S601, restore the border of described masked areas according to described boundary information.
Specifically, according to the origin coordinates in boundary information, first orient the starting point on the border of masked areas, further according to the directional chain-code in boundary information, restore the border of masked areas as shown in Figure 4 by anti-chain code tracking.
In S602, adopt region-filling algorithm to carry out area filling on the border of described masked areas, restore described fingerprint mask image.
After the border restoring masked areas, pass through region-filling algorithm, the border of masked areas as shown in Figure 4 is carried out area filling, thus restoring fingerprint mask image as shown in Figure 3, wherein, region-filling algorithm includes but not limited to the algorithm based on region growing or the algorithm based on morphological operation, etc..
Can be seen that from the read schemes of above-mentioned fingerprint mask image, although in storage fingerprint mask image, the data volume of storage is compared fingerprint mask image and itself is reduced a lot, but, restored by border and area filling, still can restore fingerprint mask image with original precision, thus ensure that the accuracy of identification of whole fingerprint recognition system.
Should be understood that in above-described embodiment, the size of the sequence number of each step is not meant to the priority of execution sequence, the execution sequence of each process should be determined with its function and internal logic, and the implementation process of the embodiment of the present invention should not constituted any restriction.
Access method corresponding to the fingerprint mask image described in foregoing embodiments, Fig. 7 illustrates the structured flowchart of the access device of the fingerprint mask image that the embodiment of the present invention provides, and the access device of described fingerprint mask image can be built in the unit that software unit in fingerprint recognition system, hardware cell or soft or hard combine.For the ease of illustrating, illustrate only part related to the present embodiment.
With reference to Fig. 7, this device includes:
Acquiring unit 71, obtains the boundary information of masked areas in fingerprint mask image；
Storage unit 72, is saved in described boundary information in file；
Read unit 73, when needs call described fingerprint mask image, read the described boundary information in described file；
Restoration unit 74, restores described fingerprint mask image according to described boundary information.
Alternatively, described boundary information includes origin coordinates and the directional chain-code of described masked areas, and described acquiring unit 71 includes:
Locator unit, positions the described origin coordinates of described masked areas；
Chain code following subelement, from described origin coordinates, carries out chain code following to described masked areas, until again navigating to the described origin coordinates of described masked areas；
Obtain subelement, obtain the directional chain-code of the described masked areas produced in described chain code following process.
Alternatively, described chain code following includes the chain code following of 4 connections or the chain code following of 8 connections.
Alternatively, described chain code following includes clockwise chain code following or chain code following counterclockwise.
Alternatively, described restoration unit 74 includes:
Subelement is restored on border, restores the border of described masked areas according to described boundary information；
Area filling subelement, carries out area filling to the border of described masked areas, restores described fingerprint mask image.
Those skilled in the art is it can be understood that arrive, for convenience of description and succinctly, only it is illustrated with the division of above-mentioned each functional unit, module, in practical application, as desired above-mentioned functions distribution can be completed by different functional units, module, it is divided into different functional units or module, to complete all or part of function described above by the internal structure of described device.Each functional unit in embodiment, module can be integrated in a processing unit, can also be that unit is individually physically present, can also two or more unit integrated in a unit, above-mentioned integrated unit both can adopt the form of hardware to realize, it would however also be possible to employ the form of SFU software functional unit realizes.It addition, the concrete title of each functional unit, module is also only to facilitate mutually distinguish, it is not limited to the protection domain of the application.The specific works process of unit, module in said system, it is possible to reference to the corresponding process in preceding method embodiment, do not repeat them here.
Those of ordinary skill in the art are it is to be appreciated that the unit of each example that describes in conjunction with the embodiments described herein and algorithm steps, it is possible to being implemented in combination in of electronic hardware or computer software and electronic hardware.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel specifically can should be used for using different methods to realize described function to each, but this realization is it is not considered that beyond the scope of this invention.
In embodiment provided by the present invention, it should be understood that disclosed apparatus and method, it is possible to realize by another way.Such as, system embodiment described above is merely schematic, such as, the division of described module or unit, being only a kind of logic function to divide, actual can have other dividing mode when realizing, for instance multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can ignore, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connect the INDIRECT COUPLING that can be through some interfaces, device or unit or communication connects, it is possible to be electrical, machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, namely may be located at a place, or can also be distributed on multiple NE.Some or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, it would however also be possible to employ the form of SFU software functional unit realizes.
If described integrated unit is using the form realization of SFU software functional unit and as independent production marketing or use, it is possible to be stored in a computer read/write memory medium.Based on such understanding, part or all or part of of this technical scheme that prior art is contributed by the technical scheme of the embodiment of the present invention substantially in other words can embody with the form of software product, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment (can be personal computer, server, or the network equipment etc.) or processor (processor) perform all or part of step of method described in each embodiment of the embodiment of the present invention.And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (ROM, Read-OnlyMemory), the various media that can store program code such as random access memory (RAM, RandomAccessMemory), magnetic disc or CD.
Embodiment described above only in order to technical scheme to be described, is not intended to limit；Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the embodiment of the present invention.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (10)
1. the access method of a fingerprint mask image, it is characterised in that including:
Obtain the boundary information of masked areas in fingerprint mask image；
Described boundary information is saved in file；
When needs call described fingerprint mask image, read the described boundary information in described file；
Described fingerprint mask image is restored according to described boundary information.
2. the method for claim 1, it is characterised in that described boundary information includes origin coordinates and the directional chain-code of described masked areas, and in described acquisition fingerprint mask image, the boundary information of masked areas includes:
Position the described origin coordinates of described masked areas；
From described origin coordinates, described masked areas is carried out chain code following, until again navigating to the described origin coordinates of described masked areas；
Obtain the directional chain-code of the described masked areas produced in described chain code following process.
3. method as claimed in claim 2, it is characterised in that described chain code following includes the chain code following of 4 connections or the chain code following of 8 connections.
4. method as claimed in claim 2, it is characterised in that described chain code following includes clockwise chain code following or chain code following counterclockwise.
5. the method for claim 1, it is characterised in that described according to described boundary information restore described fingerprint mask image include:
The border of described masked areas is restored according to described boundary information；
The border of described masked areas is carried out area filling, restores described fingerprint mask image.
6. the access device of a fingerprint mask image, it is characterised in that including:
Acquiring unit, for obtaining the boundary information of masked areas in fingerprint mask image；
Storage unit, for being saved in described boundary information in file；
Read unit, for when needs call described fingerprint mask image, reading the described boundary information in described file；
Restoration unit, for restoring described fingerprint mask image according to described boundary information.
7. device as claimed in claim 6, it is characterised in that described boundary information includes origin coordinates and the directional chain-code of described masked areas, and described acquiring unit includes:
Locator unit, for positioning the described origin coordinates of described masked areas；
Chain code following subelement, for, from described origin coordinates, carrying out chain code following to described masked areas, until again navigating to the described origin coordinates of described masked areas；
Obtain subelement, for obtaining the directional chain-code of the described masked areas produced in described chain code following process.
8. device as claimed in claim 7, it is characterised in that described chain code following includes the chain code following of 4 connections or the chain code following of 8 connections.
9. device as claimed in claim 7, it is characterised in that described chain code following includes clockwise chain code following or chain code following counterclockwise.
10. device as claimed in claim 7, it is characterised in that described restoration unit includes:
Subelement is restored on border, for restoring the border of described masked areas according to described boundary information；
Area filling subelement, for the border of described masked areas is carried out area filling, restores described fingerprint mask image.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510688243.3A CN105718214B (en) | 2015-10-21 | 2015-10-21 | The access method and device of fingerprint mask image |
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| CN201510688243.3A CN105718214B (en) | 2015-10-21 | 2015-10-21 | The access method and device of fingerprint mask image |
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| CN105718214A true CN105718214A (en) | 2016-06-29 |
| CN105718214B CN105718214B (en) | 2019-02-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112507987A (en) * | 2021-02-03 | 2021-03-16 | 深圳阜时科技有限公司 | Fingerprint identification method, storage medium and computer equipment |
| CN113204527A (en) * | 2021-05-28 | 2021-08-03 | 苏州大学 | Slice compression method based on forming area pixel coordinate mark |
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| CN1595428A (en) * | 2004-07-15 | 2005-03-16 | 清华大学 | Fingerprint identification method based on density chart model |
| CN101052989A (en) * | 2005-09-06 | 2007-10-10 | 索尼株式会社 | Image processing unit, mask generation method, and program |
| CN101763500A (en) * | 2008-12-24 | 2010-06-30 | 中国科学院半导体研究所 | Method applied to palm shape extraction and feature positioning in high-freedom degree palm image |
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| US20040120555A1 (en) * | 2002-12-20 | 2004-06-24 | Lo Peter Zhen-Ping | Slap print segmentation system and method |
| CN1595428A (en) * | 2004-07-15 | 2005-03-16 | 清华大学 | Fingerprint identification method based on density chart model |
| CN101052989A (en) * | 2005-09-06 | 2007-10-10 | 索尼株式会社 | Image processing unit, mask generation method, and program |
| CN101763500A (en) * | 2008-12-24 | 2010-06-30 | 中国科学院半导体研究所 | Method applied to palm shape extraction and feature positioning in high-freedom degree palm image |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112507987A (en) * | 2021-02-03 | 2021-03-16 | 深圳阜时科技有限公司 | Fingerprint identification method, storage medium and computer equipment |
| CN113204527A (en) * | 2021-05-28 | 2021-08-03 | 苏州大学 | Slice compression method based on forming area pixel coordinate mark |
| WO2022247085A1 (en) * | 2021-05-28 | 2022-12-01 | 苏州大学 | Slice compression method based on marking of pixel coordinates of molding region |
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| CN105718214B (en) | 2019-02-26 |
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