how to permute matrix here?

Hi.. I have an image 128x128pixels. then it is divided into 8x8 block. so that we get 16 subblocks. each 8x8 block, i would like to permute position(1,1) of matrix 8x8 from one subblock to another subblock with same position (1,1). do you know how to solve this problem? i don't know about permutation here. Thank you

Answer 1

[Image Analyst]

I don't even know what that means. Can you explain better and give an example? Can you also explain why you want to do this?

Otherwise, the only thing I can suggest is to get the row and column of each pixel in each block that you wish to swap and do the usual swap code:

savedPixelValue = grayImage(row1, column1);
grayImage(row1, column1) = grayImage(row2, column2);
grayImage(row2, column2) = savedPixelValue;

[Tia]

example
m=[1 2 3 4 5 6
   1 2 3 4 5 6
   1 2 3 4 5 6
   1 2 3 4 5 6
   1 2 3 4 5 6
   1 2 3 4 5 6]
it is divided into 3x3
b=[1 2 3 ; 1 2 3; 1 2 3];
so, we have 4 subblocks
m=[ 1 2 3   4 5 6
    1 2 3   4 5 6
    1 2 3   4 5 6

    1 2 3   4 5 6
    1 2 3   4 5 6
    1 2 3   4 5 6]
then, i want to move (1) to (4)
m=[(1)2 3  (4)5 6
    1 2 3   4 5 6
    1 2 3   4 5 6

    1 2 3   4 5 6
    1 2 3   4 5 6
    1 2 3   4 5 6]

what should i do?sorry make you confused.. i have an assignment. is it right to use permute here?

[Image Analyst]

Is the "b" a 4 by 4 array of blocks? Is it a cell array, or a 3D array of integers or doubles?

[Tia]

b is an array 3x3 from m. then,it become 4subblocks

b1=[ 1 2 3    b2=[4 5 6
     1 2 3         4 5 6
     1 2 3]        4 5 6]
b3=[1 2 3   b4=[4 5 6
    1 2 3        4 5 6
    1 2 3]       4 5 6]

it's a 2D array

[Image Analyst]

So why can't you adapt my code as follows:

row1 = 1;
column1 = 1;
savedPixelValue = b1(row1, column1);
b1(row1, column1) = b2(row2, column2);
b2(row2, column2) = savedPixelValue;