The improved OPTA thinning algorithm for fingerprint images was studied deeply. A new improved OPTA thinning algorithm was proposed to solve the problem that there is much spur in the after-thinning fingerprint images. In the new algorithm, various thinning orders were used for various line-angle and curve-direction, the remove templates were modified, and the reserve templates were improved. Through lots of experiments, the algorithm has been proved to be a better thinning algorithm, which inherits the advantages an...
