A time-frequency field fingerprint enhancement technology and three-order spline curve fitting matching algorithm research

摘要

We present a fast fingerprint enhancement algorithm in the paper. In order to enhance the fingerprint images, the algorithm firstly estimate local ridge orientation and frequency of the fingerprint images and then apply an even-symmetric Gabor filter for fingerprint images, adaptively improve the clarity of the ridge and the furrow structures of input fingerprint images. At the same time, this paper gives out an algorithm which is based on three-order spline curve fitting curve of point matching, creation of some definitions and lemmas. The results indicate that the algorithm shows out excellent features in good velocity and precision.