Matlab绘图篇3

一、图像上画框

 

I = imread('lena.bmp');

Kuang = zeros(256,256);
Kuang(100:102,100:122) = 1;%画上横线
Kuang(100:120,100:102) = 1;%画左竖线
Kuang(120:122,100:122) = 1;%画下横线
Kuang(100:120,120:122) = 1;%画右竖线

imshow(imoverlay(I,Kuang,'white')),axis normal,set(gca,'position',[0 0 1 1])

二、放大图中部分像素

I = imread('lena.bmp');
imshow(I(100:120,100:120)),axis normal,set(gca,'position',[0 0 1 1])