Fingerprint synthesis method based on orientation field model and Gabor filter

A synthesis method, technique of directional field

Inactive Publication Date: 2008-03-26
INST OF AUTOMATION CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it still cannot accurately represent the direction field, and in many cases can only achieve approximate results

Method used

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  • Fingerprint synthesis method based on orientation field model and Gabor filter
  • Fingerprint synthesis method based on orientation field model and Gabor filter
  • Fingerprint synthesis method based on orientation field model and Gabor filter

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Embodiment

[0063] Based on the method of the present invention, a fingerprint synthesis system is designed and realized by itself. The fingerprint synthesis system researched and developed is based on WindowXP / 2000, adopts object-oriented design method and software engineering specification, realizes with C++ language, and is an image processing and analysis system facing the field of fingerprint identification.

[0064] Utilize the device that the inventive method realizes as shown in Fig. 1 fingerprint synthesis system block diagram of the present invention, comprise:

[0065] The fingerprint template image unit 1 generates and outputs a binary fingerprint texture image from the input fingerprint information; and

[0066] The fingerprint pressing image unit 2 is configured to generate a fingerprint pressing image from the input binary fingerprint texture image.

[0067] As shown in the schematic diagram of the composition of the fingerprint template image generating unit of the presen...

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Abstract

This invention discloses a fingerprint synthesis method and system based on new direction module and improved Gabor filter, including steps: generate fingerprint template image, create fingerprint profile image for the first step, and on the second step generate fingerprint orientation field through new joint direction field module, the third step is to generate density map with a new presentation method of fingerprint density map, on the fourth step create fingerprint ridge texture through improved Gabor filter; fingerprint generated according to pressing image, a series of transformation has been generated on the fingerprint template images, including adding scratches, texture translation, the expansion or corrosion of the ridge, the elastic deformation of ridge line, noise and smooth of ridge line, translation and rotation of image, change contrast, add background noise. The system includes: fingerprint template image module and fingerprint image compression unit. The present invention can generate realistic image of the fingerprint. It plays an important value in biological identification technology.

Description

technical field [0001] The invention relates to pattern recognition, image processing and information processing technology, in particular to image filtering and method using direction field to realize fingerprint synthesis processing. Background technique [0002] Fingerprint identification is currently the most widely used biometric identification method. In the research of automatic fingerprint identification algorithm, a large-scale fingerprint database is needed to test and optimize the algorithm. However, there are many shortcomings in the traditional method of collecting fingerprints to build a database. First of all, it takes a lot of cost and a lot of time to collect a large number of fingerprints. Secondly, no matter for the person who collects fingerprints or the person whose fingerprints are collected, the collection process is very cumbersome and error-prone. Moreover, collecting fingerprints also involves personal privacy. If the method of synthetic fingerp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
Inventor 田捷胡瑾杨鑫
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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