question about command 'mat2cell'

dear all, I have an problem in terms of mat2cell command...

What i already know is how to deal with specific numbers, say for instance, the code for dividing image I (size 128*128 ) into non-overlapping blocks (size 8*8) is as the following:

c = mat2cell( I, [8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8], ...

[8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8]);

But I really struggled with how to write the code when there is no specific numbers, for example, divide an image I (size 128*128) into non-overlapping blocks (size n*n) , and the total amount of blocks is 128*128/n*n...

Could anyone help..? thx a lot !

Answer 1

[Bruno Luong]

I = rand(128,256);

n = 16;
mat2cell(I, n*ones(1,size(I,1)/n), n*ones(1,size(I,2)/n))

ans = 8×16 cell array
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}

[qing li]

thank you so much sir, that is really helpful !

Answer 2

[Steven Lord]

Use repmat to build your vector of tile heights or widths.

A = ones(8);
n = 2;
v = repmat(n, 1, 4) % You could compute the 4 for this line

v = 1×4

2 2 2 2

C = mat2cell(A, v, v)

C = 4×4 cell array
    {2×2 double}    {2×2 double}    {2×2 double}    {2×2 double}
    {2×2 double}    {2×2 double}    {2×2 double}    {2×2 double}
    {2×2 double}    {2×2 double}    {2×2 double}    {2×2 double}
    {2×2 double}    {2×2 double}    {2×2 double}    {2×2 double}

[qing li]

thank you so much sir, that is really helpful .