MATLAB: How can we divide an image into 16 sub images each of size 128×128

sub images

While the size of original image is 512×512

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See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F

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MATLAB: How to convert an image to binary matrix

P1 = reshape( permute(reshape( (dec2bin(P, 8) - '0').', 8, size(P,1), size(P,2)), [2 1 3]), size(P,1), size(P,2)*8);

This preserves rows and expands each column to 8 columns -- so like

P(1,1)bit1 P(1,1)bit2 P(1,1)bit3 P(1,1)bit4 P(1,1)bit5 P(1,1)bit6 P(1,1)bit7 P(1,1)bit8 P(1,2)bit1 P(1,2)bit2 and so on

Another approach would be:

P1 = reshape( cat(3, bitget(P,8), bitget(P,7), bitget(P,6), bitget(P,5), bitget(P,4), bitget(P,3), bitget(P,2), bitget(P,1)), size(P,1), size(P,2)*8);

This preserves rows, and places all of the most significant bits together, then the second most significant, then the third most, and so on,

P(1,1)bit1 P(1,2)bit1 P(1,3)bit1 ... P(1,256)bit1 P(1,1)bit2 P(1,2)bit2 .. P(1,256)bit2 P(1,1)bit3 P(1,2)bit3 and so on

MATLAB: How i can store a results of a loop FOR (are then Matrix’s) in a new Matrix

Ee = [-P(1)  e0  -P(3) P(2)
      -P(2)  P(3) e0  -P(1)
      -P(3) -P(2) P(1) e0];
  
  i = 0;        % adding counter index
  for it=2:4:52
      i = i + 1;
EeNew(1:3,1:4,i) = [-P(it+3)  P(it+2) -P(it+5)  P(it+4)    % storing evaluated matrices along the 3rd dim.
         -P(it+4)  P(it+2)  P(it+2) -P(it+3)
         -P(it+5) -P(it+4)  P(it+3)  P(it+2)];
  end
  EeNew = EeNew(:,:);                        % flattening 3rd dimension to make 3x(4*k) final matrix

Not sure i completely understood you question but maybe this is what you are looking for ?

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Related Solutions

MATLAB: How to convert an image to binary matrix

MATLAB: How i can store a results of a loop FOR (are then Matrix’s) in a new Matrix

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