文档中描述了用8个方向的SOBEL算子，实现图像中对象边缘的检测功能-The document describes the SOBEL operator with eight directions of objects in an image edge detection function

针对不同的算子进行边缘检测，得到不同的效果图，针对sobel算子进行梯度去噪。-Edge detection for different operators, different renderings, Sobel operator gradient de-noising.