脚本是oldpic = imread('1.jpg');newpic = oldpic;[r c d] = size(newpic);for row = 1:r for col = 1:c if newpic(row,col,1) > 200 newpic(row,col,1:3)=[200 200 200]; end if newpic(row,col,1) < 200 newpic(row,col,1:3)=[255 255 255]; end if newpic(row,col,1) < 240 newpic(row,col,1:3)=[0 0 0]; end endendimwrite(newpic,'2.jpg');现在我要处理文件夹里的所有图片(要用到路径吗?路径如图)如何实现?百度了好多都解决不了