Daubechies-4 wavelet transform in MATLAB

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Article #2640

#2640

From: Mariya
Date: Wed, 14 Apr 2010 21:04

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Hello:

I have a 4x4 matrix which I wish to decompose into 4 frequency bands
(LL, HL, LH, HH where L=low, H=high) by using a one-level Daubechies-4
wavelet transform. As a result of the transform, each band should
contain 2x2 coefficients. How can I do this in MATLAB? I know that
MATLAB has dbaux and dbwavf functions. However, I'm not sure how to
use them and I also don't have the wavelet toolbox.

I have read the wikipedia article (http://en.wikipedia.org/wiki/
Daubechies_wavelet) and also this paper (http://www.springerlink.com/
content/57540u87733k1861/fulltext.pdf). I have no prior experience
necessary so any help is greatly appreciated.

Thanks.

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From: Mariya <mariya.nagorna@gmail.com>
Newsgroups: comp.dsp,free.it.comp.lang.matlab
Subject: Daubechies-4 wavelet transform in MATLAB
Date: Wed, 14 Apr 2010 14:04:46 -0700 (PDT)
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