边缘提取\7.bmp ........\bacteria.BMP ........\bijiao1.m ........\canny1.m ........\ct1.jpg ........\log1.m ........\mri1.jpg ........\nm.jpg ........\prewitt1.m ........\sobel1.m ........\sobel2.m ........\suiyuzhi.m ........\yuzhifa.m 边缘提取