一种基于灰度级相位的指纹图像增强方法

摘要

图像增强是指纹识别系统中非常重要的一个步骤.本文提出了灰度级相位的概念,并实现了一个根据灰度级相位增强指纹图像的方法.该方法首先计算指纹区域内每个像素点的灰度级相位,然后对灰度级相位进行滤波,最后根据滤波后的灰度级相位构建指纹图像.测试结果表明该方法对低质量的指纹图像增强效果好.%Image enhancement is an important procedure in an automatic fingerprint recognition system. An item called gray-level phase is defined, and a gray-level phase based image enhancement approach is proposed. In this approach, gray-level phase of each pixel is obtained firstly; then a filter is designed for gray-level phase; finally, the enhanced image is obtained according to the filtered gray-level phase. The experimental results show that the proposed approach is promising for low quality fingerprint image.