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Certainty coding method and system in fingerprint identification

A fingerprint recognition and fingerprint technology, applied in character and pattern recognition, instruments, computer parts, etc., can solve problems such as hidden safety hazards and low accuracy

Inactive Publication Date: 2009-03-18
TSINGHUA UNIV +1
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Problems solved by technology

Using this method, the deterministic coding features (fingerprint DNA) that are only related to individual fingerprints can be extracted from the fingerprint image, and the deterministic coding features can be used to achieve accurate matching in the process of fingerprint recognition, thereby overcoming the traditional fingerprint recognition system based on point patterns. The fuzzy matching algorithm has the disadvantages of low correct rate and potential safety hazards

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  • Certainty coding method and system in fingerprint identification
  • Certainty coding method and system in fingerprint identification
  • Certainty coding method and system in fingerprint identification

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Embodiment Construction

[0050] The deterministic encoding method in the fingerprint identification proposed in the present invention mainly includes the following steps, which are described in detail in conjunction with the accompanying drawings as follows:

[0051] figure 1 A computer system suitable for use with embodiments of the invention is described. The computer system includes a central processing unit (CPU) and some input and output devices, such as a keyboard, a mouse, a display, and may also include a fingerprint image collection device and the like. The software implementing the present invention is stored in the internal memory, and the CPU can access the internal memory and perform corresponding instructions to obtain the implementation result of the present invention.

[0052] figure 2 It is a flow chart of the deterministic coded fingerprint recognition system. The figure includes four parts: original image acquisition, image binarization and refinement, deterministic code extract...

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Abstract

The present invention belongs to the computer biometrics technology and relates to a method and a system which adopt certainty coding to accurately match fingerprints during the process of fingerprint comparison. The present invention has the accurate matching by using characteristic of the certainty coding that a characteristic area can be selected from the fingerprint image and the characteristic value corresponding to the characteristic area, such as the total length of fingerprint ridge line, the entropy of the main direction of the direction field of the ridge line and the direction field of the pixel point, to conduct matching work. The certainty coding method and the fingerprint identification system built by the method overcome the defects, such as low accuracy rate and potential safety problems which are caused by adopting fuzzy matching algorithm in the traditional point fingerprint identification system.

Description

technical field [0001] The invention belongs to the technical field of computer biometric identification, and in particular relates to a fingerprint identification method using deterministic coding and a fingerprint identification system constructed by the method. Background technique [0002] Existing fingerprint identification methods are fuzzy matching methods based on point patterns. Define the bifurcation point of the fingerprint ridge line and the endpoint of the fingerprint ridge line as the feature points of the fingerprint. In the article "Azriel Rosenfeld. Point pattern matching by relaxation" (Pattern Recognition, 1980, 12(5): 269-275), authors Ranade and Rosenfeld proposed a relaxation algorithm for point matching: define point set L1=P1... Pm and point set L2=Q1...Qm. For a pair of matching (Pi, Qj), a relative transformation Trij of the two point sets is defined. According to the matching degree of other points in the two point sets under TRij transformation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/46G06K9/68
Inventor 蔡莲红贾珈彭振云
Owner TSINGHUA UNIV
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