Patent
Method for dividing fingerprint image based on gradient projection and morphology
Mei Xie,Chengpu Yu +1 more
TLDR
In this article, a fingerprint image segmentation method based on gradient projection and morphology was proposed, which pertains to the technical field of image processing, and the fingerprint image was established on the gradient map of fingerprint, and therefore the calculated amount is relatively small.Abstract:
The invention relates to a fingerprint image segmentation method based on gradient projection and morphology, which pertains to the technical field of image processing. Firstly, lateral and longitudinal first difference images of an original fingerprint image Gx and Gy and a gradient image Del f, are calculated; then the lateral and longitudinal projection curves of the gradient image Del f are utilized to determine a foreground area a rough fingerprint; the foreground area of the rough fingerprint image is divided and fuzzy areas are removed by utilizing the consistency threshold value at the gradient direction; the gradient magnitude of the rough fingerprint foreground area image with fuzzy areas removed is binarized and a module, the size of which is more than the distance between two adjacent ridge lines is utilized to carry out close operation and open operation over the gradient binarized image so as to obtain a fingerprint segmentation template; finally, the original fingerprint image and the fingerprint segmentation template carry out point multiplication to obtain the final fingerprint foreground area image. The fingerprint image segmentation method of the invention is established on the gradient map of fingerprint, and therefore the calculated amount is relatively small and the fingerprint foreground contour after being operated by the morphology is relatively smooth.read more
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