Then comparethe edge images which are gained separately after using the methods such asRobert, Sobel, Laplacian and Marr, and propose an improved method on Sobelto extract edge feature information.

• 然后对比采用了Robert、Sobel、Laplacian、Mart各种算子后得到的边缘图象，提出一种Sobel算子的改进算法来提取边缘的特征信息。