MATLAB: Calculating energy of an image

image processing

I have a code for dual tree 3D,in that i want to calculate energy for each subband ,please help how to calculate energy
   x = rand(64,64,16);
    J = 1;
    [Faf, Fsf] = FSfarras;
    [af, sf] = dualfilt1;T=10;
    w = dualtree3D(x, J, Faf, af);
  y = idualtree3D(w, J, Fsf, sf);

Best Answer

You can calculate the energy as follows
    x = rand(64,64,16);
    J = 1;
    [Faf, Fsf] = FSfarras;
    [af, sf] = dualfilt1;T=10;
    w = dualtree3D(x, J, Faf, af);
    details = w{1}{1}{1};
    energy = sum(abs(details(:)).^2);
w{2}{:}{:} contains the approximation coefficients
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