中文说明：
准备常规的边缘提取功能。通过输入不同的参数，可以实现Sobel算子，Prewitt算子，Roberts算子，Marr算子和Canny边缘检测。实验图片可选。
English Description：
Preparation of a common edge extraction function. By entering different parameters to achieve the Sobel operator, Prewitt operator, Roberts, operator, operator of Marr and Canny edge detection. Experimental image optional.