%調入與顯示RGB圖像
RGB = imread('peppers.png');
isrgb(RGB);
figure(1);
imshow(RGB);
%RGB圖轉換為灰度圖像
I = rgb2gray(RGB);
figure(2);
imshow(I);
colorbar('horiz');
isgray(I);
%邊緣檢測
ED = edge(I,'sobel',0.08);
figure(3)
imshow(ED);