WO2017166318A1 - Procédé et appareil d'identification par empreintes digitales, et terminal - Google Patents

Procédé et appareil d'identification par empreintes digitales, et terminal Download PDF

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Publication number
WO2017166318A1
WO2017166318A1 PCT/CN2016/078384 CN2016078384W WO2017166318A1 WO 2017166318 A1 WO2017166318 A1 WO 2017166318A1 CN 2016078384 W CN2016078384 W CN 2016078384W WO 2017166318 A1 WO2017166318 A1 WO 2017166318A1
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WIPO (PCT)
Prior art keywords
fingerprint
image
sliding
pressing
area
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Ceased
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PCT/CN2016/078384
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English (en)
Chinese (zh)
Inventor
王信亮
钟志鑫
闵敬丹
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Huiding Technology Co Ltd
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Priority to CN201680000694.6A priority Critical patent/CN106062778B/zh
Priority to PCT/CN2016/078384 priority patent/WO2017166318A1/fr
Publication of WO2017166318A1 publication Critical patent/WO2017166318A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing

Definitions

  • the present invention relates to the field of fingerprint recognition technologies, and in particular, to a fingerprint identification method, apparatus, and terminal.
  • fingerprint recognition technology has also developed rapidly in the field of mobile terminals, involving functions such as fingerprint unlocking and fingerprint payment.
  • the user will face two fingerprint identification schemes: the first one is pressing registration, pressing recognition; the second is sliding registration, sliding recognition.
  • the disadvantage of the first solution is that the fingerprint sensor registration fingerprint template is required to be pressed by the finger multiple times during registration, resulting in a poor user experience; the second disadvantage is that the finger needs to slide on the fingerprint sensor during recognition, and the fingerprint sensor is not pressed. Convenience.
  • the embodiment of the invention provides a fingerprint identification method, which aims to organically integrate sliding registration and press recognition to enhance the user experience.
  • the first aspect provides a fingerprint identification method, including: acquiring m fingerprint sliding image sequences, where m is a natural number; and splicing the m fingerprint sliding image sequences into fingerprint images S1, S2, ..., Sm; Fingerprint images T1, T2, ..., Tn, n are extracted from the fingerprint images S1, S2, ..., Sm A natural number is obtained; a fingerprint pressing image is acquired; and the fingerprint pressing image is compared and matched with the fingerprint templates T1, T2, . . . , Tn.
  • the intercepting the fingerprint templates T1, T2, ..., Tn from the fingerprint images S1, S2, ..., Sm includes: pressing a scan
  • the size of the area is a search window, searching for the area with the largest effective area of the fingerprint in the horizontal direction of the fingerprint image Si, i traversing the integer in the interval [1, m]; and cutting the largest effective area of the fingerprint according to the size of the search window
  • the area is used as the fingerprint template Tj, j is an integer in the interval [1, n]; the search window translates a preset number of pixels in the vertical direction of the fingerprint image Si, and the above steps are repeated, and finally the fingerprint template T1, T2 is intercepted. ,...,Tn.
  • the preset number is greater than 1.
  • the sliding scan area of the acquired fingerprint sliding image sequence is smaller than the pressed scanning area of the acquired fingerprint pressing image.
  • the method further includes: replacing the fingerprint pressing image with the fingerprint template Ts if the fingerprint pressing image is successfully matched with the fingerprint template Ts
  • the fingerprint template Ts,s is an integer in the interval [1, n].
  • a second aspect provides a fingerprint identification device, comprising: an acquisition unit, configured to acquire m fingerprint sliding image sequences, where m is a natural number; and a splicing unit, configured to splicing the m fingerprint sliding image sequences into a fingerprint image S1 , S2, ..., Sm; intercepting unit, intercepting the fingerprint templates T1, T2, ..., Tn, n from the fingerprint images S1, S2, ..., Sm are natural numbers; the collecting unit is further configured to acquire a fingerprint pressing image; The identification unit is configured to compare and match the fingerprint pressing image with the fingerprint templates T1, T2, . . . , Tn.
  • a terminal including: a housing, a processor, a memory, a circuit board, and an electric a source circuit, wherein the circuit board is disposed inside a space enclosed by the housing, the processor and the memory are disposed on the circuit board; the power supply circuit is configured to supply power to each circuit or device of the terminal; and the memory is configured to store the executable program code;
  • the processor runs a program corresponding to the executable program code by reading executable program code stored in the memory for performing the following steps: acquiring m fingerprint sliding image sequences, m being a natural number; sliding the m fingerprints The image sequences are respectively spliced into fingerprint images S1, S2, ..., Sm; fingerprint templates T1, T2, ..., Tn, n are taken from the fingerprint images S1, S2, ..., Sm as natural numbers; fingerprint pressed images are acquired; The fingerprint pressing image is compared and matched with the fingerprint templates T1, T2, . . . , Tn.
  • the sliding registration and the pressing recognition are combined, and the captured sliding image sequence is spliced into larger fingerprint images S1, S2, . . . , Sm, and then intercepted in the fingerprint images for pressing identification.
  • the fingerprint template whereby the user can complete the fingerprint template registration by sliding the finger during registration, and only needs to press once to complete the fingerprint recognition, and organically integrates the fingerprint recognition scheme of the prior art.
  • FIG. 1A and FIG. 1B are schematic diagrams showing the arrangement of a sliding fingerprint sensor and a push type fingerprint sensor according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a fingerprint identification method according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of a sequence of collected and stitched fingerprint sliding images provided by an embodiment of the present invention.
  • FIG. 4 is a specific flow chart of step S203 of Figure 2;
  • FIG. 5 is a schematic diagram of intercepting a fingerprint image according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a sliding scanning area and a pressing scanning area according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of a fingerprint identification method according to Embodiment 2 of the present invention.
  • FIG. 8 is a schematic structural diagram of a fingerprint identification apparatus according to Embodiment 3 of the present invention.
  • Figure 9 is a schematic structural view of the intercepting unit of Figure 8.
  • FIG. 10 is a schematic structural diagram of another fingerprint identification apparatus according to Embodiment 3 of the present invention.
  • FIG. 11 is a schematic structural diagram of a terminal according to Embodiment 4 of the present invention.
  • fingerprint recognition technology has been widely used.
  • the user selects a finger to register on the smart phone according to his own usage habits, that is, the fingerprint sensor on the smart phone collects the fingerprint image of the user and saves it as a fingerprint template; subsequent users access the smart phone.
  • the fingerprint sensor on the smart phone collects the fingerprint image of the user in real time, and then matches it with the pre-saved fingerprint template. If the matching is successful, the user can perform corresponding operating.
  • they can be divided into sliding and pressing.
  • a strip-shaped sliding fingerprint sensor 11 is disposed on the front side of the smartphone; as shown in FIG. 1B, it is a square press. The fingerprint sensor is placed on the back of the smartphone.
  • the sliding fingerprint registration sequence is spliced into a larger fingerprint image after the sliding registration is combined with the sliding registration and the pressing recognition, and then the fingerprint template used for pressing recognition is intercepted in the fingerprint image. Therefore, the user can complete the fingerprint template registration by sliding the finger during registration, and only needs to press once to complete the fingerprint recognition, and organically integrates the fingerprint recognition scheme of the prior art.
  • FIG. 2 is a flowchart of a fingerprint identification method according to Embodiment 1 of the present invention. As shown in Figure 2, the method includes:
  • the sliding mode is adopted at the time of registration.
  • the sliding scanning area on the fingerprint sensor scans the slipped finger at a certain frequency, and collects a series of fingerprint sliding images with a relatively small area relative to the finger, as shown in FIG. Slide the image sequence for the fingerprint.
  • the size of each fingerprint sliding image is based on the size of the sliding scanning area. As shown in FIG. 3, the size of the sliding scanning area is W*Hs pixels, and the size of each fingerprint sliding image is also W*Hs pixels.
  • each fingerprint sliding image sequence includes multiple fingerprint sliding images; and multiple sliding sliding image sequences can be collected.
  • S202 splicing the m fingerprint sliding image sequences into fingerprint images S1, S2, . . . , Sm.
  • a fingerprint sliding image sequence is spliced into a larger fingerprint image S1
  • the fingerprint image S1 reflects fingerprint texture information in a larger area of the finger.
  • the fingerprint sliding image sequence obtained by the first sliding is spliced into the fingerprint image S1
  • the fingerprint sliding image sequence obtained by the second sliding is spliced into the fingerprint image S2; and so on, when m is greater than 2
  • the m fingerprint sliding image sequences are respectively spliced into fingerprint images S1, S2, ..., Sm. S1, S2, ..., Sm all reflect the fingerprint texture information in a large area of the finger, but the fingerprint texture information contained therein is different.
  • the splicing method here can adopt the existing splicing algorithm. Due to the possibility of offset during splicing, as shown in FIG. 3, the size of the fingerprint image S1 is Width*Height pixels, the Width is greater than W, and the Height is greater than Hs.
  • S203 The fingerprint templates T1, T2, ..., Tn, n are extracted from the fingerprint images S1, S2, ..., Sm as natural numbers.
  • S203 specifically includes the following steps:
  • S401 Searching for the size of the pressed scan area as a search window, searching for the area with the largest effective area of the fingerprint in the horizontal direction of the fingerprint image Si, i traversing the integer in the interval [1, m].
  • the size of the fingerprint template saved in advance should be the same as the size of the fingerprint compression image collected when the finger is pressed, and the size of the fingerprint compression image is based on the size of the pressed scanning area.
  • the direction is in the direction of Width.
  • S402 The area with the largest effective area of the fingerprint is intercepted according to the size of the search window as the fingerprint template Tj, and j is an integer in the interval [1, n].
  • a fingerprint template such as the fingerprint template T1 in FIG.
  • the search window translates a preset number of pixels in a vertical direction of the fingerprint image Si, and then repeats the above steps, and finally extracts the fingerprint templates T1, T2, . . . , Tn.
  • the search window shifts a preset number of pixels in the vertical direction, the vertical direction is in the Height direction, and then the process of searching and intercepting is repeated in the horizontal direction, thereby obtaining a plurality of fingerprint templates T2, ... , Tn.
  • the fingerprint template is extracted from the fingerprint large image (fingerprint image S1) spliced during the sliding registration, and the size of the fingerprint template is the same as the size of the fingerprint pressing image during the recognition, so that the sliding registration and the pressing recognition can be effectively performed. Connect.
  • the number of pixels in the search window that are translated in the vertical direction is greater than one. That is, when the image is translated in the vertical direction, the adjacent search windows may be overlapped or non-overlapping. For example, if the size of the search window is W*H pixels, the preset number of panning is less than or equal to H when overlapped, and the preset number of pans is greater than H when there is no overlap.
  • the pressing method is adopted: the finger is pressed on the fingerprint sensor, and the pressed scanning area on the fingerprint sensor scans the pressed finger at a certain frequency to collect a fingerprint pressing image.
  • the size of the fingerprint pressing image is based on the size of the pressing scanning area. As shown in FIG. 6 , the size of the pressing scanning area is W*H pixels, and the size of the fingerprint pressing image is also W*H pixels.
  • the sliding scan area for acquiring the fingerprint sliding image sequence is smaller than the pressing scanning area for acquiring the fingerprint pressing image. This is because when sliding registration, there is a slight relative movement between the finger and the sliding scanning area, and a certain deformation is introduced when splicing into the fingerprint image S1. At the same scanning frequency, the smaller the sliding scanning area is, the more deformation is generated. small.
  • the sliding registration will be obtained.
  • the fingerprint sliding image sequence is spliced into a larger fingerprint image S1, and then the fingerprint template used for pressing recognition is taken out in the fingerprint image, thereby the user can complete the registration of the fingerprint template by sliding the finger during registration, when identifying Fingerprint recognition can be completed only by pressing once, and the fingerprint recognition scheme of the prior art is organically integrated.
  • the finger slides on the fingerprint sensor multiple times, and a plurality of fingerprint sliding image sequences are acquired, that is, m is greater than 1.
  • Each fingerprint sliding image sequence is respectively spliced into a fingerprint large image (fingerprint image S1, S2, ..., Sm), and then the fingerprint image S1, S2, ..., Sm is subjected to the search and interception steps described above, and the fingerprint template T1 is intercepted. , T2,...,Tn,...
  • the multiple fingerprint sliding image sequences are collected during the sliding registration because the relative position of the finger and the sliding scanning area is shifted to different degrees each time the sliding is performed, and the fingerprinted large image is obtained (fingerprint images S1, S2, ... , Sm) is not the same, that is, each time the fingerprint texture information collected is not the same, more fingerprint templates can be intercepted from multiple fingerprint large images, including more fingerprint texture information, which is beneficial to the subsequent identification process. .
  • FIG. 7 is a flowchart of a fingerprint identification method according to Embodiment 2 of the present invention. As shown in FIG. 7, the method includes:
  • the cut fingerprint template is T1, T2, . . . , Tn. If the captured fingerprint pressing image matches the fingerprint template Ts successfully, the fingerprint template Ts is replaced by the fingerprint pressing image.
  • the matching method here can adopt an existing fingerprint image recognition algorithm, and judge whether the fingerprint pressing image and the fingerprint template match according to the magnitude of the similarity.
  • the similarity represents a degree of similarity between images, including but not limited to the number of feature point matches, the histogram distribution similarity, and the like. The greater the similarity, the graph The probability that the match is successful and recognized is greater.
  • the fingerprint template obtained by the sliding is replaced by the fingerprint pressing image because: compared with the fingerprint pressing image, the fingerprint template obtained by splicing and cutting the fingerprint sliding sequence has a certain deformation, thereby affecting the recognition rate; after each recognition is successful, The fingerprint pressing image replaces the fingerprint template obtained by sliding, and the fingerprint template obtained by sliding can be gradually replaced with the fingerprint template obtained by pressing, thereby reducing the influence of deformation and improving the recognition rate, and at the same time, the user is not required to perform additional Operation.
  • FIG. 8 is a schematic structural diagram of a fingerprint identification apparatus according to Embodiment 3 of the present invention.
  • the fingerprint identification device 80 includes an acquisition unit 81, a splicing unit 82, a clipping unit 83, and an identification unit 84.
  • the collecting unit 81 is located in the sensing area of the fingerprint sensor, and is used to acquire m fingerprint sliding image sequences, where m is a natural number.
  • the splicing unit 82 is configured to splicing the m fingerprint sliding image sequences into fingerprint images S1, S2, . . . , Sm, respectively.
  • the intercepting unit 83 intercepts the fingerprint templates T1, T2, ..., Tn, n from the fingerprint images S1, S2, ..., Sm as natural numbers.
  • the collecting unit 81 is further configured to acquire a fingerprint pressing image.
  • the identification unit 84 is configured to compare and match the fingerprint pressing image with the fingerprint templates T1, T2, . . . , Tn.
  • the intercepting unit 83 includes a search subunit 831, a truncation subunit 832, and a panning subunit 833.
  • the search sub-unit 831 is configured to search for the area where the effective area of the fingerprint is the largest in the horizontal direction of the fingerprint image Si by using the size of the pressed scan area as the search window, i traversing the integer in the interval [1, m].
  • the intercepting sub-unit 832 is configured to intercept the area with the largest effective area of the fingerprint as the fingerprint template Tj according to the size of the search window, and j is an integer in the interval [1, n].
  • the translation sub-unit 833 is configured to translate the search window by a preset number of pixels in the vertical direction of the fingerprint image Si, and then repeat the operations of the search sub-unit 831 and the intercept sub-unit 832, and finally intercept the fingerprint templates T1, T2, . . . , Tn.
  • the fingerprint template is extracted from the fingerprint large image (fingerprint image S1, S2, ..., Sm) obtained by splicing during the sliding registration, and the size of the fingerprint template is the same as the size of the fingerprint pressing image during the recognition, so that the sliding can be performed. Registration and press recognition are effectively articulated.
  • the preset number of translations of the search window in the vertical direction is greater than one in consideration of the correlation of the fingerprint templates obtained by the interception. That is, when the image is translated in the vertical direction, the adjacent search windows may be overlapped or non-overlapping.
  • the sliding scan area in the acquisition unit 81 is smaller than the pressed scan area. This is because when sliding registration, there is a slight relative movement between the finger and the sliding scanning area, and a certain deformation is introduced when splicing into the fingerprint images S1, S2, ..., Sm, and the scanning area is scanned at the same scanning frequency. The smaller the smaller the deformation, the smaller.
  • the fingerprint identification device 80 further includes a replacement unit 85 for replacing the fingerprint template Ts with the fingerprint pressing image if the fingerprint pressing image matches the fingerprint template Ts successfully.
  • s is an integer in the interval [1, n].
  • the fingerprint template obtained by the sliding is replaced by the fingerprint pressing image because: compared with the fingerprint pressing image, the fingerprint template obtained by splicing and cutting the fingerprint sliding sequence has a certain deformation, thereby affecting the recognition rate; after each recognition is successful, The fingerprint pressing image replaces the fingerprint template obtained by sliding, and the fingerprint template obtained by sliding can be gradually replaced with the fingerprint template obtained by pressing, thereby reducing the influence of deformation and improving the recognition rate, and at the same time, the user is not required to perform additional Fuck Work.
  • the sliding fingerprint registration sequence is spliced into a larger fingerprint image S1, S2, ..., Sm after the sliding registration is combined with the sliding registration and the pressing recognition, and then the fingerprint images are intercepted in the fingerprint images.
  • Pressing the fingerprint template used for identification the user can complete the fingerprint template registration by sliding the finger during registration, and only needs to press once to complete the fingerprint recognition, and organically integrates the fingerprint recognition scheme of the prior art.
  • the device in this embodiment corresponds to the foregoing method embodiment. Therefore, the specific content of each module of the device in this embodiment can be referred to the related description in the method embodiment, and is not described in detail herein.
  • FIG. 11 is a schematic structural diagram of a terminal according to Embodiment 4 of the present invention.
  • the terminal 1100 includes a housing 1101, a processor 1102, a memory 1103, a circuit board 1104, and a power supply circuit 1105.
  • the circuit board 1104 is disposed inside a space surrounded by the housing 1101, and the processor 1102 and
  • the memory 1103 is disposed on the circuit board 1104;
  • the power supply circuit 1105 is for supplying power to the respective circuits or devices of the terminal 1100;
  • the memory 1103 is for storing executable program code;
  • the processor 1102 is configured to read the executable program code stored in the memory 1103. Run the program corresponding to the executable code to perform the following steps:
  • the m fingerprint sliding image sequences are respectively spliced into fingerprint images S1, S2, ..., Sm.
  • the fingerprint templates T1, T2, ..., Tn, n are taken from the fingerprint images S1, S2, ..., Sm as natural numbers.
  • the fingerprint pressing image is compared and matched with the fingerprint templates T1, T2, ..., Tn.
  • the sliding registration will be obtained.
  • the fingerprint sliding image sequence is spliced into larger fingerprint images S1, S2, ..., Sm, and then the fingerprint template used for pressing recognition is taken out in the fingerprint images, thereby the user can complete the fingerprint template by sliding the finger during registration.
  • the registration can be completed only by pressing once, and the fingerprint recognition scheme of the prior art is organically integrated.
  • any process or method description in the flowcharts or otherwise described herein can be understood as representing code that includes one or more executable instructions for implementing the steps of a particular logical function or process. Modules, segments or portions, and the scope of the preferred embodiments of the invention includes additional implementations, which may not be in the order shown or discussed, including in a substantially simultaneous manner or in reverse order depending on the functionality involved. The functions are performed, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.
  • portions of the invention may be implemented in hardware, software, firmware or a combination thereof.
  • multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
  • a suitable instruction execution system For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.
  • each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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  • Collating Specific Patterns (AREA)

Abstract

L'invention concerne un procédé et un appareil d'identification par empreintes digitales, et un terminal. Le procédé d'identification par empreintes digitales comporte les étapes consistant à: acquérir m séquences d'images de glissement d'empreintes digitales (201); raccorder respectivement les m séquences d'images de glissement d'empreintes digitales pour donner des images S1, S2,…, Sm d'empreintes digitales (S202); intercepter des modèles T1, T2,…, Tn d'empreintes digitales à partir des images S1, S2,…, Sm d'empreintes digitales (S203); acquérir une image de pression d'empreinte digitale (S204); et comparer et confronter l'image de pression d'empreinte digitale avec les modèles T1, T2,…, Tn d'empreintes digitales (S205). Selon le procédé d'identification par empreintes digitales, en combinant un enregistrement par glissement avec une identification par pression, des séquences d'images de glissement d'empreintes digitales acquises sont raccordées pour donner des images S1, S2,…, Sm d'empreintes digitales relativement grandes après l'enregistrement par glissement, puis des modèles d'empreintes digitales sont interceptés à partir de ces images d'empreintes digitales en vue d'une utilisation dans l'identification par pression. Ainsi, un utilisateur peut accomplir un enregistrement de modèles d'empreintes digitales en faisant glisser un doigt pendant l'enregistrement, et l'identification par empreintes digitales peut être accomplie en une seule pression au cours de l'identification, ce qui intègre organiquement les solutions d'identification par empreintes digitales de la technique antérieure.
PCT/CN2016/078384 2016-04-01 2016-04-01 Procédé et appareil d'identification par empreintes digitales, et terminal Ceased WO2017166318A1 (fr)

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