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Sliding fingerprint sequence seamless joint method of extension phase correlated

A fingerprint sequence and phase correlation technology, applied in the field of image processing, can solve the problems of high sliding speed requirements, quality gap, high hardware cost, etc.

Inactive Publication Date: 2005-11-09
HANGZHOU JINGLIANWEN TECH
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Problems solved by technology

[0003] A search of prior art literature found that a swipe fingerprint collector containing 256 pressure sensing elements (Charlot, B.; Parrain, F.; Galy, N.; Basrour, S.; Courtois, B.; " Asweeping mode integrated fingerprint sensor with 256 tactile microbeams", Journal of Microelectromechanical Systems, 13(4), 2004, pp.636-644) was proposed, the fingerprint image quality obtained by the collector is relatively high, but it is not as good as the optical fingerprint collector ( For example, compared with the fingerprint image collected by U.are.U4000), there is still a certain gap in quality, and the cost of hardware implementation is too high, the requirement for sliding speed is also high, and the reliability is not enough

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  • Sliding fingerprint sequence seamless joint method of extension phase correlated
  • Sliding fingerprint sequence seamless joint method of extension phase correlated
  • Sliding fingerprint sequence seamless joint method of extension phase correlated

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Embodiment

[0031] 1. Detection of the pixel-level translation of the sliding fingerprint sequence

[0032] figure 2 The principle diagram of motion estimation based on block matching is shown. There are differences in the following three aspects among various block matching methods: 1) matching criterion; 2) search strategy; 3) selection of block size. The present invention adopts the maximum incremental symbol correlation as the matching criterion, and since it mainly involves binary operations, it is convenient to realize on hardware. Since the direction in which the finger slides on the surface of the sliding fingerprint collector is the same, it may be assumed that the finger slides from top to bottom. In this way, the lower area of ​​the previous frame of fingerprint image overlaps with the upper area of ​​the next frame of fingerprint image. Accordingly, the present invention is set according to table 1 (x 0 ,y 0 ) and (H b ×W b ) value to detect the value of the offset. i...

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Abstract

This invention relates to a method of sliding-fingerprint sequence seamless construction technology in the domain of image process. It estimates the picture element translation between adjacent two fingerprint images based on the movement of block matching, and then obtains the estimation of the sub-picture element translation quantity by relative correlation, at last progresses the aperture self-fitted elimination by construction of linearity elasticity model. It consists of these steps: 1. detecting of the picture element translation of fingerprint sequence; 2. detecting the sub-picture element translation quantity; 3. gap adaptive removing. The advantages is suitable for every sliding fingerprint collection module.

Description

technical field [0001] The invention relates to a method in the technical field of image processing, in particular to a method for seamless splicing of extended phase-correlated sliding fingerprint sequences. Background technique [0002] With the rapid development of computer technology, the use of biometric technology for identification and authentication has increasingly entered people's lives and work. Compared with other biometric authentication technologies, such as speech recognition and iris recognition, fingerprint recognition has many unique advantages, more importantly, it has high practicability and feasibility, and has been considered as an ideal identity authentication technology. It has a very broad application prospect and will be the mainstream of biometric identification technology in the future. As a part of automatic fingerprint identification technology, fingerprint collection technology has also been developed rapidly in recent years, and sliding finge...

Claims

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Application Information

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IPC IPC(8): G06K9/00
Inventor 张永良杨杰
Owner HANGZHOU JINGLIANWEN TECH
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