subplot(2,2,1) imshow(I) title( 原始图象 )

subplot(2,2,2) imshow(BW1) title( prewitt 边缘检测后的图象 )

subplot(2,2,3) imshow(BW2) title( canny 边缘检测后的图象 )

subplot(2,2,4) imshow(BW3) title( sobel 边缘检测后的图象 )

-subplot (2,2, 1) imshow (I) title (original image) subplot (2,2, 2) imshow (BW1) title (prewitt edge detection of images) subpl ot (2,2, 3) imshow (BW2) title (canny edge detection of images) subplot (2') imshow (BW3) title (segmentation edge detection, the image)