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Method for preprocessing finger vein images

A technology of image preprocessing and finger veins, applied in instruments, character and pattern recognition, computer components, etc.

Active Publication Date: 2011-10-19
GUANGZHOU WEDONETECH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no research on how to obtain a refined image from the original image has been found in the field of finger vein authentication.

Method used

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  • Method for preprocessing finger vein images
  • Method for preprocessing finger vein images
  • Method for preprocessing finger vein images

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Embodiment Construction

[0080] The present invention will be described in more detail below with examples in conjunction with the accompanying drawings.

[0081] Such as figure 1 As shown, the finger vein image preprocessing method of the present invention comprises the following steps:

[0082] 1. Read in the original finger vein image. When reading in, the finger is required to be placed on a horizontal device stably.

[0083] 2. Extract the edge line of the finger vein image. Since the general edge detection method is very sensitive to noise, in order to remove the influence of noise at the boundary and detect the complete boundary as much as possible, it is necessary to perform a smoothing and denoising process on the original image, and most of the noise can be removed by simple template smoothing. The present invention uses 8-field weighted average method to carry out smoothing and its template is as follows:

[0084]

[0085] The smoothing formula is: ;

[0086] Use the Sobel operator...

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Abstract

The invention discloses a method for preprocessing finger vein images. The method comprises a series of continuous treatment processes of: reading in an original image; detecting finger brims; rotating and rectifying the vein images; redetermining the finger brims after rotation; denoising and enhancing the images; detecting the valley-shaped brims of the images and carrying out binaryzation on the images; carrying out filtering and denoising; shielding a background area; expanding and corroding the images; and thinning the images to obtain single-pixel thinned images. The processing method has better effect of processing the finger vein images, particularly the finger vein images with the low quality caused by nonuniform illumination, low image contrast and unclear veinprints, and the finally obtained thinned image basically contains the useful information of veinprint in the original image so as to provide the most useful vein information for thinned image based finger vein feature extraction and the matching method.

Description

technical field [0001] The invention relates to a biometric identification technology, in particular to a near-infrared finger vein image preprocessing method. Background technique [0002] Research on identification technology based on finger vein pattern characteristics is a hot spot in the field of biometric identification technology in recent years. Among the various finger vein feature extraction methods currently used, the finger vein pattern feature extraction method based on thinning is the most common and the most reliable and reasonable. However, in view of the inherent characteristics of finger vein patterns, near-infrared devices are usually used to collect pattern samples. 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 pretreatment in the field of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/54
Inventor 陈庆武郑伟锐林春漪
Owner GUANGZHOU WEDONETECH TECH CO LTD