% Computes the Mean Absolute Difference (MAD) for the given two blocks% Input%       currentBlk : The block for which we are finding the MAD%       refBlk : the block w.r.t. which the MAD is being computed%       n : the side of the two square blocks%% Output%       cost : The MAD for the two blocks%% Written by Aroh Barjatyafunction cost = costFuncMAD(currentBlk,refBlk, n)%currentBlk=double(currentBlk);%refBlk=double(refBlk);err = 0;for i = 1:n    for j = 1:n        err = err + abs((currentBlk(i,j) - refBlk(i,j)));    endendcost = err / (n*n);