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Re: Discrete Wavelet Transform with Daubechies wavelet
From: |
Laurent Jacques |
Subject: |
Re: Discrete Wavelet Transform with Daubechies wavelet |
Date: |
Tue, 12 Aug 2003 21:59:20 +0200 |
User-agent: |
KMail/1.5.2 |
Hi,
I think that Wavelab developed by S. Mallat et al. is working on Octave.
It is exactly what you need, it is free (GPL ?) and available here
http://www-stat.stanford.edu/~wavelab/
Bye,
Laurent.
On Tuesday 12 August 2003 19:09, Robert Leach wrote:
> Hi,
>
> I'm fairly new on this wavelet stuff and need to do a DWT using a
> daubechies wavelet (my first wavelet foray). I have a few questions:
>
> Is there a free package that implements DWT and IDWT? (I found
> libwaili for debian - but is there a port for Mac OS X?)
>
> How do I construct a daubechies wavelet with 10 vanishing moments for
> use with DWT or is there a good resource for learning how to do this?
>
> I'm confused about what's a coefficient. I know that DWT yields a
> series of coefficients and to produce a scalogram, you plot the energy
> versus wavelet scale. My understanding is that energy is the sum of
> the squares of the coefficients at each scale level, but don't I only
> have one coefficient per scale level? I'm going to go to the library
> today to read the daubechies '92 paper, so I may end up finding these
> answers, but if anyone can explain it, I'd appreciate it.
>
> Thanks,
> Rob
>
> =====================================================================
> = Robert W. Leach =
> = Los Alamos National Lab =
> = Bioscience Division: Bioinformatics & Computational Biology Group =
> = MS M888 =
> = Los Alamos, NM 87545 =
> = address@hidden =
> = 505-667-2307 =
> =====================================================================
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