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## Discrete Wavelet Transform with Daubechies wavelet

 From: Robert Leach Subject: Discrete Wavelet Transform with Daubechies wavelet Date: Tue, 12 Aug 2003 11:09:28 -0600

```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:
```
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Is there a free package that implements DWT and IDWT? (I found libwaili for debian - but is there a port for Mac OS X?)
```
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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?
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```
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                                              =
= 505-667-2307                                                      =
=====================================================================
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