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Hand vein image enhancement method

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

Active Publication Date: 2011-04-20
南通通迈自动化科技有限公司
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AI Technical Summary

Problems solved by technology

[0019] 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
  • Hand vein image enhancement method
  • Hand vein image enhancement method

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Embodiment Construction

[0036] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0037] 1. Blur enhances global contrast

[0038] In order to speed up the fuzzy enhancement algorithm, in the present invention, the optimization of the two parameters b and r is mainly carried out, and the two optimal parameters are determined, and then the optimal relationship function is determined. The expression of the relational function is as follows:

[0039] μ x r ( x : a , b , c ) =

[0040] = 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-parameterrelation 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 therequirement 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 characteristics is 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 collected sample images are characterized by low contrast, narrow gray value range, and extremely uneven distribution. Operability, accuracy, and stability will be greatly affected, so these problems must be solved first, which belongs to the process of sample enhancement in the field of biometric identification technology. [0003] There are many traditional methods to solve this kind of problem, the most commonly used one is local histogram enhancement, which is very effective for p...

Claims

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Application Information

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Patent Type & Authority Patents(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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