Study on the pre-processing method for fingerprint image

Certain reasonable assumptions based on fingerprint structural property were proposed in connection with the difficulties induced by fingerprint image degradation. The corresponding processing algorithms were derived on this basis. The algorithms such as enhancing fingerprint image contrast, extracting the effective zone of fingerprint, segmenting image according to the orientation information and eliminating the bubble noise in image, etc. were proposed. The experiments show that these algorithms have the advantages of good processing effect, fast operating speed and simple programming. They have solved the problems in pre-processing degraded image.