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why wavelet filter used in DWTCT??

Asked by Sultan Mehmood on 24 Dec 2018
%load sculpture
%imagesc(X)
%colormap gray
[LoD,HiD] = wfilters('haar','d');
[cA,cH,cV,cD] = dwt2(X,LoD,HiD,'mode','symh');
subplot(2,2,1)
imagesc(cA)
colormap gray
title('Approximation')
subplot(2,2,2)
imagesc(cH)
colormap gray
title('Horizontal')
subplot(2,2,3)
imagesc(cV)
colormap gray
title('Vertical')
subplot(2,2,4)
imagesc(cD)
colormap gray

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