How to divide 256X256 matrix into sixteen 16X16 blocks?

Khloe - 2020-10-23T09:50:06+00:00

Question: How to divide 256X256 matrix into sixteen 16X16 blocks?

I am having pixel value of an image as 256X256 matrix. I want to divide it into sixteen 16X16 matrix (ie)an image into sub blocks. It is needed to compare each 16X16 with other.

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Expert Answer

Prashant Kumar answered . 2025-11-20

You need to use mat2cell:

X = reshape(1:20,5,4)'
C = mat2cell(X, [2 2], [3 2])
celldisp(C)

This code returns

X =
     1     2     3     4     5
     6     7     8     9    10
    11    12    13    14    15
    16    17    18    19    20

C = 
    [2x3 double]    [2x2 double]
    [2x3 double]    [2x2 double]

C{1,1} =
     1     2     3
     6     7     8

C{2,1} =
    11    12    13
    16    17    18

C{1,2} =
     4     5
     9    10

C{2,2} =
    14    15
    19    2

In your case:

A = rand(256); % your matrix here
N = 16*ones(1,16);
B = mat2cell(A,N,N);

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