Scilab Wavelet Toolbox Function
Last update : Feburary 2006

idwt2 - two dimensional inverse fast discrete wavelet transform

Calling Sequence

a0=idwt(cA,cH,cV,cD,wavename,row,col,[extension_method])

Parameters

Description

This function performs two dimensional inverse fast discrete wavelet transform and provides a reconstructed version of signal. Extension method should be consistent with that of the decomposition procedure. Detailed algorithm is fully described in the userguide.

Examples


-->img=rand(64,64);
-->[cA,cH,cV,cD]=dwt2(img,'db2','symh');
-->a0=idwt2(cA,cH,cV,cD,'db2',64,64,'symh');
-->sum(abs(a0-img))
 ans  =
 
    4.693E-13


  

See Also

dwt ,   idwt ,   dwt2