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Hand vein image enhancement method

A vein image, hand technology, applied in image enhancement, image data processing, computer parts and other directions, can solve the problems of narrow gray value, uneven gray value distribution, low contrast of vein samples, etc. Efficiency compliance, reducing the effect of redundant operations

Active Publication Date: 2009-10-28
南通通迈自动化科技有限公司
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Problems solved by technology

[0020] The purpose of the present invention is to provide a vein image enhancement method that can solve the problems of low contrast of vein samples, narrow gray value, uneven gray value distribution, etc.

Method used

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  • Hand vein image enhancement method
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Embodiment Construction

[0037] Hereinafter, the present invention will be described in more detail with examples in conjunction with the accompanying drawings:

[0038] 1. Blur enhances global contrast

[0039] In order to accelerate the fuzzy enhancement algorithm, the present invention mainly optimizes the two parameters b and r, determines the two optimal parameters, and then determines the optimal relationship function. The expression of the relation function is as follows:

[0040] μ X r ( x : a , b , c ) =

[0041] = 0 , if x ≤ a , ...

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Abstract

The invention provides a hand vein image enhancement method that includes an overall contrast enhancement and a local detail enhancement. Specifically, the method includes: step 1. using two-parameter relation function to convert a hand vein mode sample from a spatial domain to an ambiguity domain and enhancing the overall contrast of the sample; step 2. using a multiple dimensioned retinex algorithm to enhance the details of the hand vein mode in the ambiguity domain; and step 3. converting the hand vein mode from the ambiguity domain to the spatial domain and forming a result image. The method solves the problems of low contrast, narrow gray value, non-uniform gray value distribution and the like of the hand vein sample, and after improvement, the efficiency of the method conforms to the requirement of a mode identification system.

Description

(1) Technical field [0001] The invention relates to a biometric identification technology, in particular to a near-infrared vein pattern image enhancement method. (2) Background technology [0002] Research on identification technology based on hand vein pattern features has been a hot spot in the field of biometric identification technology in recent years. In view of the inherent characteristics of hand vein patterns, near-infrared devices are usually used for pattern sample collection. The characteristics of the collected sample images are low contrast, narrow gray value range and extremely uneven distribution. If directly processed, subsequent related algorithms can be used. The operability, accuracy, and stability will be greatly affected, so these problems must be solved first. In the field of biometric identification technology, it is a process of sample enhancement. [0003] There are many traditional methods to solve such problems. The most commonly used is local histogr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/20G06K9/36
Inventor 王科俊熊新炎冯伟兴管凤旭王晨晖李雪峰
Owner 南通通迈自动化科技有限公司
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