clcclearclose?all;
img?=?imread（‘sjtu.jpg‘）;%讀取原圖像
gray?=?rgb2gray（img）;
grayPic?=?mat2gray（gray）;
[mn]?=?size（grayPic）;
newGrayPic?=?grayPic;
PrewittNum=0;%經(jīng)Prewitt算子計(jì)算得到的每個(gè)像素的值
hold?=?[0.2?0.5?0.8];
sort?=?2;
subplot（221）imshow（gray）;
title（‘oringinal‘）;
name?=?{‘?‘‘0.2‘‘0.5‘‘0.8‘}
for?PrewittThreshold?=?hold;
for?j=2:m-1?%進(jìn)行邊界提取
????for?k=2:n-1
????????PrewittNum=abs（grayPic（j-1k+1）-grayPic（j+1k+1）+grayPic（j-1k）-grayPic（j+1k）+grayPic（j-1k-1）-grayPic（j+1k-1））+abs（grayPic（j-1k+1）+grayPic（jk+1）+grayPic（j+1k+1）-grayPic（j-1k-1）-grayPic（jk-1）-grayPic（j+1k-1））;
????????if（PrewittNum?>?PrewittThreshold）
????????????newGrayPic（jk）=255;
????????else
????????????newGrayPic（jk）=0;
????????end
????end
end
subplot（22sort）;imshow（newGrayPic）;
title（name{sort}）;
sort?=?sort+1;
end

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件?????????854??2018-04-10?12:00??Exp3_Prewitt.m
?????文件?????????721??2018-04-10?12:01??Exp3_Roberts.m
?????文件?????????886??2018-04-10?12:01??Exp3_Sobel.m