Re: Discrete Wavelet Transform with Daubechies wavelet

[Laurent Jacques]

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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