Resizing an image and dividing it into blocks

%matlab code
I = imread(image);
[x y] = size(I);
x,y
[m n] = size(I); 
J = imresize(I, [256 256]); 
[x1 y1] = size(J);
x1,y1

I'm getting the output in the first case as x=400, y=2100 and in the second case as x1=256(expected), y1=768(unexpected). Additionally, I need to divide this image into 4 blocks of 128 x 128 pixels each. Can anyone please help me out?

Answer 1

[Walter Roberson]

Read the documentation about what the output of size() is when the number of output arguments is not the same as the number of dimensions of the array.

To divide the image into so few pieces, just index it as needed.

More generally see mat2cell

[Monsij Biswal]

Thanks a ton!