Finding energy from co-occurrence matrix

I am trying to find energy of an image using co occurrence matrix. Is this code correct? Is the method of calculating gray level co occurrence matrix correct?

offsets = [ 0 1; -1 1; -1 0; -1 -1]; 

T(i).energy = 0;        %initial energy of image (T(i)) is 0

Imag = T(i).data;      %Reading image into Imag 
glcm = graycomatrix(Imag,'Of',offsets); %calculating gray level co-occurrence matrix
glcm
[r c] = size(glcm);
for ctr=1:1:r
  for ctr2=1:1:c
      T(i).energy = T(i).energy+(glcm(ctr,ctr)).^2;        
  end
end
fprintf('energy is %li\n\n',T(i).energy);

Answer 1

[Sean de Wolski]

Just a quick comment: your line inside the for-loop never references ctr2, probably typo. You could vectorize both for-loops with the simple:

 T(i).energy = sum(gclm(:).^2);

-Sean

[fathi]

yes i think it is correct answer

Answer 2

[A]

offsets = [ 0 1; -1 1; -1 0; -1 -1];

T(i).energy = 0; %initial energy of image (T(i)) is 0

Imag = T(i).data; %Reading image into Imag

glcm = graycomatrix(Imag,'Of',offsets); %calculating gray level co-occurrence matrix

glcm

[r c] = size(glcm);

for ctr=1:1:r

for ctr2=1:1:c

T(i).energy = T(i).energy+(glcm(ctr,ctr)).^2;

end

end

fprintf('energy is %li\n\n',T(i).energy);