中文说明：在指纹特征提取中，结合方向图和图像局部灰度方差对指纹图像进行分割，然后再进行阈值分割去处边缘效应得出较好的分割结果。
English Description：
In the fingerprint feature extraction, the fingerprint image is segmented by combining the directional image and the local gray variance of the image, and then the threshold segmentation is carried out to remove the edge effect to get a better segmentation result.