PREPROCESSING IN AN AUTOMATIC FINGERPRINT IDENTIFICATION SYSTEM

Preprocessing is the first step of fingerprint identification system, and it influences the result of fingerprint identification directly. The preprocessing in an automatic fingerprint identification system is presented in four parts:filtration in gray image, binaryzation, filtration in binary image, and thinning. The algorithms introduced here have all been checked in practice and have good result, to that they have high value both in practice and in reference.