Composite thinning algorithm for fingerprint image
指纹图像细化的复合式算法

Fingerprint image thinning is an essential step in the fingerprint recognition system, which plays a key role in the feature extraction. In order to thin the fingerprint image efficiently, we analyze the underlying causes of the disadvantages of the existing fast parallel thinning algorithm and the improved OPTA thinning algorithm, and then present a new composite fingerprint image thinning algorithm is presented in this paper. A set of preprocessing templates are designed to smooth images after fast thinning. In addition, the improved OPTA algorithm is optimized for speed. A large number of experimental results show that, the presented algorithm has high thinning speed, and can obtain good thinning quality.