Improved directional filter and flexible matching based recognition method
A technology of directional filtering and recognition methods, which is applied in the directions of character and pattern recognition, instruments, computer parts, etc., can solve the problems of great influence on the accuracy of recognition results, large amount of calculation, and great influence on image quality recognition results, etc., to achieve The effect of high reliability, high precision and high use value
Active Publication Date: 2014-10-29
华正清圆(天津)科技有限公司
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Abstract
The invention relates to an improved directional filter and flexible matching based recognition method. The gray level difference between finger vein image blood vessels collected under the near-infrared light conditions and the background is small, the contrast ratio is low, and accordingly the subsequent matching recognition of a finger vein image is affected. The improved directional filter and flexible matching based recognition method comprises designing out the neighborhood direction which is suitable for every pixel point of the read finger vein image through the directional characteristics of vein patterns to form a direction template; solving a directional pattern of the vein image through the template; performing direction filtering on the image according to the direction of the pixel points; extracting detail feature points of the image on the basis of the direction filtering; implementing the matching recognition between the feature points within the polar angle range and the polar radius range through the flexible matching thought, wherein the polar angle range is selected to be 1 to 4 degrees and the polar radius range is selected to be 1 to 4 pixel points. The improved directional filter and flexible matching based recognition method is applied to the mode recognition technical field.
Application Domain
Character and pattern recognition
Technology Topic
Near infrared lightGray level +3
Image
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