IDWT

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kush 2012-3-23

i am facing a problem that after doing dwt2 on image say X if i do idwt2 with same cA cH cV cD output doesnt come same will u plz help

Wayne King 2012-3-23

What do you mean by not the same?

load woman;
dwtmode('per');
[A,H,V,D] = dwt2(X,'db2');
Xrec = idwt2(A,H,V,D,'db2');
Y = Xrec-X;
max(Y(:))

This is on the order of 10^(-10) for the maximum difference between the two images. That is the same.

Are you changing the coefficients before you perform the inverse DWT?

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