Template size self-adaptable Gabor fingerprint image enhancement method
An adaptive template and fingerprint image technology, which is applied in character and pattern recognition, instruments, computer components, etc., can solve the problems of inability to obtain enhancement effects, large changes in the direction and frequency of ridges, and the destruction of ridge structure information, etc. question
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[0036] Such as figure 1 Shown, the Gabor fingerprint image enhancement method of adaptive template size comprises the following steps:
[0037] 1.) Input the fingerprint image, divide the input image I(x, y) into W×W blocks that do not overlap with each other, and the default value of W×W is 8×8; extract the ridge direction of each block and ridge frequency;
[0038] 2.) Obtain the curvature of the ridges in the block;
[0039] 3.) Determine the size of the enhanced template;
[0040] 4.) Construct an enhanced template;
[0041] 5.) Enhance the fingerprint image to obtain the enhanced fingerprint image.
[0042] Wherein, in step 1.), the ridge direction and ridge frequency extraction method of each block are:
[0043] a. In each block, calculate the gradient value of the gray level of each pixel point (x, y) and
[0044] b. Use formula (1) to calculate the ridge direction value of each block,
[0045] θ W ( ...
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