Research on the Key Technique of Image Preprocessing in the Fingerprint Identification

The theory and algorithms of fingerprint identification were firstly introduced. By comparing kinds of methods and analysing the characteristics of fingerprint image, the new preprocessing techniques based on histogram equalization of wavelet frequency division and multi-scale product of wavelet transform based on direction pattern were proposed. The experiment results showed that this algorithm formed single pixel edge of the fingerprint and achieved the effects of edge enhancement, noise cancellation, smooth, binarization and edge thinning as well as time complexity reduction.