Divide a matrix into submatrices in MATLAB

Question

I have an RGB image of size 412x550. I want to divide it into sub matrices of size 2x2. I have tried using mat2cell function but it is

Answer 1

In general, you can use the following code to divide the image into blocks (for compression process or whatever)

    A=imread('image.bmp'); % i assume 8-bit gray scale image
    [m,n,k]=size(A); % and m=n with 1 channel k=1
    ImageSize=m*n;
    BlockD=2; % i assume 2x2 block
    BlockSize=BlockD*BlockD;
    NoOfBlock=ImageSize/BlockSize;
    SubB=zeros(BlockD,BlockD,NoOfBlock); %arrays of blocks.
    B=double(A); important to convert uint8 to double when dialing with image.
    % thats what ru asking for.
    k=1;
    for i=1:BlockD:m
    for j=1:BlockD:n
        SubB(:,:,k)=B(i:i+BlockD-1,j:j+BlockD-1); k=k+1;
    end
    end
    %compare between first submatrix A with first block.. its the same elements.
    B(1:2,1:2)
    SubB(:,:,1)