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Re: DWT2 Single-level 2-D wavelet transform
From: |
Stefan van der Walt |
Subject: |
Re: DWT2 Single-level 2-D wavelet transform |
Date: |
Wed, 23 Jun 2004 09:13:42 +0200 |
User-agent: |
Mozilla Thunderbird 0.5 (X11/20040306) |
Using WaveLab, you can do something similar to
octave:1> startup % load wavelab
octave:2> I = imread('lenna256.jpg'); % load an image
octave:3> qmf = MakeONFilter('Symmlet', 8); % create a quadrature mirror
%filter of the required type
octave:4> [n,J] = dyadlength(I); % get the dyadic length of the first
% row of I
octave:5> FWT2_PO(I, J-1, qmf); % do the forward wavelet transform
% (2 levels)
Regards
Stéfan
David Bateman wrote:
I don't think there is dwt2, but for wavelets on octave see the references
http://www-stat.stanford.edu/~wavelab/
http://wiki.octave.org/wiki.pl?WavelabOnOctave
Regards
David
According to Jean-Michel besnard <address@hidden> (on 06/22/04):
Hi,
I am porting a MATLAB source code to Octave and I wonder if there is a function
similar to the 'dwt2()' of MATLAB.
NB: this matlab function does a single level 2D wavelet decomposition.
Thanks,
Jean-Michel
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