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denoising colored image using discrete wavelet transform

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anas qazaz
anas qazaz 2016-2-27
hi all, i want denoise colored image using discrete wavelet transform i use the following code
%Reading the image pic=imread('A1','jpeg'); figure, imagesc(pic);colormap(gray);
%Define the Noise Variance and adding Gaussian noise %While using 'imnoise' the pixel values(0 to 255) are converted to double in the range 0 to 1 %So variance also has to be suitably converted sig=100; V=(sig/256)^2;
npic=imnoise(pic,'gaussian',0,V); figure, imagesc(npic);colormap(gray);
%Define the type of wavelet(filterbank) used and the number of scales in the wavelet decomp filtertype='db4'; levels=5;
%Doing the wavelet decomposition [C,S]=wavedec2(npic,levels,filtertype);
%Define the threshold(universal threshold) M=size(pic,1)^2; UT=sig*sqrt(2*log(M));
%Hard thresholding %Doing the hard thresholding-threshold only detail coefficients!! hardC=[C(1:S(1,1)^2), hthresh(C(S(1,1)^2+1:length(C)),UT)];
%Reconstructing the image from the hard-thresholded wavelet coefficients newpich=waverec2(hardC,S,filtertype);
%Displaying the hard-denoised image figure, imagesc(newpich);colormap(gray);
%Soft thresholding softC=[C(1:S(1,1)^2), sthresh(C(S(1,1)^2+1:length(C)),UT)];
%Reconstructing the image from the soft-thresholded wavelet coefficients newpics=waverec2(softC,S,filtertype);
%Displaying the soft-denoised image figure, imagesc(newpics);colormap(gray);
the following error is displayed: ??? Error using ==> image Error using ==> image TrueColor CData contains element out of range 0.0 <= value <= 1.0
Error in ==> imagesc at 19 hh = image(varargin{1},'CDataMapping','scaled');
Error in ==> visuthresh at 50 figure, imagesc(newpich);colormap(gray);
>> thank in advance

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