Subject: DWT reconstruction From: Twilighter Date: 22 Jun, 2012 13:20:08 Message: 1 of 2 Hi I use this for a dwt decomp [C,S]=wavedec2(X,3,'db4'); cA3=appcoef2(C,S,'db4',3); cA2=appcoef2(C,S,'db4',2); cA1=appcoef2(C,S,'db4',1); [cH3,cV3,cD3] = detcoef2('all',C,S,3); [cH2,cV2,cD2] = detcoef2('all',C,S,2); [cH1,cV1,cD1] = detcoef2('all',C,S,1); I perform some process onthe detail coefficients in the 3 levels then i need to recover my original image back yousing this equation img= waverec2(C,S,'db4'); so i reshape every coeff matrix like cH3 = (cH3, 1, m*n) then i form a vector for every level decomposition V1 = [cA1, cH1, cV1, cD1] V2 = V3 = then i restore it back into the C at its copistion C(1:len3) = V3; C(len3+1 : len3+len2) = V2; C(len3+len2+1:end) = V1; but i performed a little test before doing the above step i found that when i add the length of those 3 vecotrs it's bigger than the size of C ? what's logicially wrong in here wrong in here? isn't C = [ A(N) | H(N) | V(N) | D(N) | ... H(N-1) | V(N-1) | D(N-1) | ... | H(1) | V(1) | D(1) ].
 Subject: DWT reconstruction From: Twilighter Date: 22 Jun, 2012 13:43:07 Message: 2 of 2 I figured it out, I should wouldnt consider cA at lower levels as they are already replaces by the decomposed higher levels my vectors should be   V1 = [cH1, cV1, cD1]  V2 = [cH2, cV2, cD2]  V3 = [cA3, cH3, cV3, cD3] Thank you, hope this may help anyone who is trying the same thing

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