中文说明：Roberts算子，Prewitt算子，Sobel算子，Marr算子，Canny算子之一对输入图像实现边缘检测，输出边缘图像并与matlab自带函数实现进行对比
English Description：
Roberts operator, Prewitt operator, Sobel operator, Marr operator, Canny operator one of the input image to achieve edge detection, output edge image and Matlab function to achieve comparison