去噪工具包

				function Noisyim = GWNoisy2(im,sigma)
				%  GWNoisy2- Addition of a 2D Gaussian White Noise
				%  Usage
				%    Noisyim = GWNoisy2(im,sigma)
				%  Inputs
				%    im        Input simage
				%    sigma   s.d for additive GWN
				%  Outputs
				%    Noisyim    Noisy image
				%
				
				n=length(im);
				Noise=GWN2(n,sigma);
				Noisyim=im+Noise;
				
				% Written by Maureen Clerc and Jerome Kalifa, 1997
				% clerc@cmapx.polytechnique.fr, kalifa@cmapx.polytechnique.fr
				    
				    
				%   
				% Part of WaveLab Version 802
				% Built Sunday, October 3, 1999 8:52:27 AM
				% This is Copyrighted Material
				% For Copying permissions see COPYING.m
				% Comments? e-mail wavelab@stat.stanford.edu
				%