关键词: 指纹, 二值图像, Gabor滤波, 特征点

Abstract: During the preprocess of fingerprint images,Gabor filter shows prominent effect in image smoothing and segmentation.But Gabor filter is also very sensitive to the changes of ridge line direction and frequency,which leads to severe loses and changes of fingerprint feature in actual practice.To eliminate the defects,phase difference method are introduced in binarization,then Gabor filter is used for binary image enhancement.The proposed method not only reserves the Gabor filter’s advantages,such as connection of broken line and noise reduction,but also avoids its limitation,such as more sensitivity to the changes of frequency.So,in binarization process,it can effectively preserve fingerprint features.

Key words: fingerprint, binary image, Gabor filter, feature