一种新的指纹图像模板细化方法*

OPTA方法是一个经典的指纹图像细化方法，针对OPTA的不足提出的改进OPTA方法能够得到完全细化的指纹图像，细化后图像纹线扭曲小。但是这两种模板细化方法均存在细化后图像容易产生毛刺的不足，究其原因是由于模板细化方向粗糙造成的。为此提出了16方向的细化模板，该模板以22.5°为角度单位对图像进行更细致的细化处理，得到的细化图像光滑几乎无毛刺，取得了更为理想的细化效果。

New template thinning method for fingerprint image

OPTA method is a classical thinning method for fingerprint image.Improved OPTA method,which was proposed to overcome the insufficiency of OPTA method,could obtain a complete thinning result,and could eliminate the distortion of the skeleton.But the above two template thinning methods had the deficiency of being easy to get burrs after thinning for the cause of thinning direction of the templates was not detail.In order to deal with this problem,this paper proposed a set of 16-direction thinning templates.New method uses 22.5 degrees as an angle unit to process image meticulously.The results show that thinned image is smooth and almost not has any burrs,more ideal thinning effect is obtained.