I reshaped the image elements 256*256 into 16*1 linear array using the following code. There is 16 linear arrays in a variable (ex:tv). Now i need to retrieve the first array of variable (tv). ie, i need tv(1), tv(2)... tv(16). Please say the code.

I=imread('cameraman.tif'); I=double(I); Im=size(I); %find the size of the image [nr nc nd]=size(I); % Divide into blocks disp(nr); disp(nc);

% Divide into blocks m=64; n=64; row=1; column=1; i=1; j=1; sum=0; count=0; nnn=1; er1=0; for i=1:4:16

    for j=1:4:16

      block=I(i:i+3,j:j+3);
      disp(block)
      T = rand(16,16); % Size of all your vectors, concatenated
      Tr = reshape(T,[4,4,16])
      %convert 4X4 into 16X1 column vector
      tv=reshape(block,16,1);
      disp(tv)
     count=count+1

      column=column+4;

   end

   row=row+4;

end

Answer 1

[Image Analyst]

I didn't delve into your code but I see you creating a 16x1 vector in it:

tv=reshape(block,16,1);

so what's the problem?

[divya taru]

thank you sir for your reply. there are 16 vectors in the form of 16*1. now i want to access all vectors separately.. for ex, tv=reshape(block,16,1); tv has 16 vectors in the form of 16*1.i need to access tv(1),tv(2),... tv(16). please send code.. i am very new to matlab. please help me.

[Image Analyst]

Just make it a 2D array with indexing

tv = zeros(16, length(1:4:16)); % One column for each possible value of j
column = 1;
for j=1:4:16
    % Code......
    tv(:, column) = reshape(T,[4,4,16]);
    column = column + 1;
    % more code....
end

Now each one of those tv you have will be saved into one column instead of being overwritten during the next iteration.

[divya taru]

thank you sir for your reply again. i used your code. but i am having the following error sir. please guide me. because i am very new to matlab. sorry for the disturbance. please answer me sir. the error is: ??? Error using ==> reshape To RESHAPE the number of elements must not change.

Error in ==> array4 at 11 tv(:, column) = reshape(I,[4,4,16]);

[divya taru]

thank you sir. your answer is correct. i am so happy.. thank you so much sir.