指纹图像的预处理算法

提出了一种基于Gabor滤波的指纹图像预处理算法,包括指纹图像的增强、背景的分割、二值化和细化等几部分;在指纹图像增强方面,利用指纹的方向特性设计出Gabor滤波器,使用Gabor滤波器对指纹进行滤波;在图像分割方面,采用了滤波后指纹图像4个角部灰度均值作为阈值的快速分割算法;在二值化和细化方面也做了探讨;实验结果表明,经过这种预处理算法提取出了纹线,并且很好地保留了纹线的关键信息.

Pre-processing Algorithm of Fingerprint Image

A set algorithm for pre-processing of fingerprint image based on Gabor filter is proposed in this paper. Fingerprint enhancement, background segmentation, binarization, filtration in binary image and thinning are all discussed in this set of algorithms. Using Gabor filter designed by ridge orientation of fingerprint implements fingerprint enhancement. As to segmentation of fingerprint image, a speedy approach is proposed which uses the average value gray in four corners as threshold. It also makes discussion in binarization and thinning. Experiments show that the ridge is extracted and the key information is saved after the pre-processing.