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function mse = MSERROR(A, B) 
 
% The function takes two equal images and calculates the mean square  
% difference inbetween the two. 
% Usage: 	MSE = MSERROR(A, B, NSIZE); 
% where		A: 	first image 
%		B:	second image 
%		NSIZE:	size of the images 
 
 
	diff = A - B;			% difference 
	diff_sq = diff .^ 2;		% difference squared 
	mse_clmn = mean(diff_sq);	% means square diff. of the columns; 
	mse = mean(mse_clmn);