Pre-processing Algorithm of Fingerprint Image

A set algorithm for pre-processing of fingerprint image is proposed in this paper. It is based on the analysis of the inherent feature of fingerprint and the limitation of traditional method in fingerprint image processing. Using Gabor filter designed by ridge orientation and ridge frequency of fingerprint,this algorithm implements fingerprint enhancement with perfect effect. It also makes improvement in other pre-processing steps such as image segmenting and two-domain image processing.