how we can select 1/4th part of picture in matlab

[per isakson]

Why tagged as "class"?

[Image Analyst]

What picture? The surf.gif picture you posted? Do you want 1/4 of that rendered picture, or do you want to plot just 1/4 of the data that was plotted in that picture. What does "select" mean exactly. Come on, you need to be more precise and descriptive in what you want if you want meaningful help.

Answer 1

[Wayne King]

Use imcrop() if you have the Image Processing Toolbox.

Answer 2

[Azzi Abdelmalek]

h=imread('pout.tif');
imshow(h)
[n,m]=size(h)
h4=h(1:round(n/2),1:round(m/2))
figure;imshow(h4)   %top left corner

or bottom left corner

h4=h(round(n/2):end,1:round(m/2))
imshow(h4)

or bottom righ corner

h4=h(round(n/2):end,round(m/2):end)
imshow(h4)

or top right corner

h4=h(1:round(n/2),round(m/2):end)
imshow(h4)