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Phase displacement fuzzy difference binaryzation method in fingerprint digital picture processing

A digital image and phase shift technology, applied in character and pattern recognition, instruments, computer parts, etc., can solve the problem of missing fingerprint features, and achieve the effect of enhanced effect and good processing effect.

Inactive Publication Date: 2009-12-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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Problems solved by technology

However, after processing, in the process of obtaining an approximate bimodal fingerprint histogram, a large number of fingerprint features have been lost.

Method used

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  • Phase displacement fuzzy difference binaryzation method in fingerprint digital picture processing
  • Phase displacement fuzzy difference binaryzation method in fingerprint digital picture processing
  • Phase displacement fuzzy difference binaryzation method in fingerprint digital picture processing

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Embodiment Construction

[0034] The present invention will be further described now in conjunction with accompanying drawing:

[0035] The hardware environment used for implementation is: Pentium-2.66G computer, 1.00GB internal memory, 64M graphics card, and the running software environment is: Window XP. We have realized the method that the present invention proposes with VC++ and MATLAB 7.1 programming language.

[0036] Let I(i, j) be the original fingerprint image with size M×N.

[0037] Step 1. First, we perform phase shift processing on the original image I(i, j) with a size of 640×640.

[0038] J1(i, j), J2(i, j) are phase-shifted images respectively, and have a matrix M×N with the same size as I(i, j). For the image J1(i, j), the relationship between any pixel in J2(i, j) and the corresponding point in I is:

[0039] J 1 ( i , ...

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Abstract

The invention relates to a phase shift fuzzy difference binarization method in fingerprint digital image processing. The technical feature is that: adopting different phase shift methods in the upper left and upper right directions for the entire image, adopting smoothing processing for the original image, and using the smoothed image and the two images with phase offset are calculated separately, and the result of the difference calculation is two images with phase offset; the threshold value 1 is used to segment the two difference images respectively, and two binary images are obtained; one of them is The binary image is phase-shifted to another image so that the phases of the two binary images are consistent, and the enhanced binary image can be obtained by multiplying the phase-shifted binary image with another binary image. Beneficial effects: use the simplest image phase shift, smoothing, difference, threshold and product algorithms to complete the whole process of fingerprint binarization in the fastest time and with the largest retention of feature points. For low-quality fingerprint images, it also has a good processing effect, and has an obvious enhancement effect on the light-colored low-pixel areas in the fingerprint image.

Description

technical field [0001] The invention relates to a phase shift fuzzy difference binarization method in fingerprint digital image processing, belonging to the fields of digital image processing and pattern recognition. Background technique [0002] In various types of automatic fingerprint identification systems (Automated Fingerprint Identification System, AFIS), it is usually necessary to perform binarization on fingerprint images. Complexity. In the automatic fingerprint identification process, the change of feature points is the root cause of the problem, and the main reason for this problem is the binary processing method of the fingerprint. [0003] Binarization is the most basic method in the automatic identification process of digital fingerprints. The effect of binarization processing directly affects the performance of the algorithm. In the actual fingerprint library, the histogram of the fingerprint image generally has the characteristics of a single peak, which m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/38
Inventor 郭雷陈大海
Owner NORTHWESTERN POLYTECHNICAL UNIV