how do i divide image into subblocks in 1:2:1 proportion like shown in the figure

please help me with this

[Rik]

duplicated in: https://www.mathworks.com/matlabcentral/answers/380037-i-want-to-divide-into-subblocks-in-1-2-1-proportion-as-in-the-attached-fiures-how-do-i-do-that

Answer 1

[Walter Roberson]

[r, c, p] = size(YourImage);
rq = floor(r/4); rh = floor(r/2); rq3 = r - rq - rh;
rparts = [rq rh rq3];
cq = floor(c/4); ch = floor(c/2); cq3 = c - cq - ch;
cparts = [cq ch cq3];
blocks = mat2cell(YourImage, rparts, cparts, p);

I do operations this way because of the possibility that the size is not exactly divisible by 4, and wanting to be sure that we do not get an off-by-one due to round-off.