Iris geometrical property extracting method based on property edge distribution
A feature edge and geometric feature technology, applied in the field of iris geometric feature extraction based on feature edge distribution, can solve the problems of unsatisfactory recognition accuracy, algorithm performance easily affected by the external environment, and good anti-interference
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[0060] The present invention is further described below by way of examples.
[0061] (1) Divide iris sub-regions.
[0062] First, normalize the iris image to obtain a rectangular iris texture image, such as Figure 9 , and divide the rectangular iris texture image into subregions, such as Figure 10 , to complete the iris image divided into sub-regions. Each iris texture sub-region is a minimum extraction unit of iris geometric features for feature matching.
[0063] (2) Using arcsine wavelet to extract edges.
[0064] Such as Figure 11 (a), for the 256-color iris original image without edge extraction, use Asbw9.9 as the wavelet basis function to perform multi-resolution edge extraction, resolution level i=-1,-2,-3,-4 ;Such as Figure 11 (b), an edge image generated for a set of edge pixels at four resolution levels, the image contains geometric edge information at each resolution; as Figure 11 (c) is the result of directly thresholding the edge pixel gradient modulu...
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