View source for Wavelets on Trees

== General Information ==

* This website provides source code for wavelet transforms on trees, with applications to:
** Distributed data compression for wireless sensor networks
** Image coding

* Publications describing these transforms can be found at:
**[http://biron.usc.edu/wiki/index.php/CompressionGroup/DSNProject Distributed Compression for Sensor Networks web page] for transforms used in WSN
**[http://biron.usc.edu/~godwinsh Godwin Shen's web page] for transforms used in image coding (and WSN)

* This page is maintained by Godwin Shen
** Email: godwinsh@usc.edu


== Source Code ==
* Comments, questions or concerns should be directed to: godwinsh@usc.edu

* [http://biron.usc.edu/~godwinsh/WSN_SampleCode_v4.zip MATLAB source code for wavelets on trees in WSN]
** Last Updated On: September 24, 2009
*** Fixed a bug in cost computations (9/24/09)
*** New cost computations added (8/20/09)
** This code provides implementations of the transforms described in the related publications shown below
** The main files to start with are Example_LossyCoding.m and Example_LosslessCoding.m


== Related Publications ==
<ul>
<li> G. Shen and A. Ortega, "Transform-based Distributed Data Gathering". <i>Submitted to IEEE Transactions on Signal Processing</i>.
[http://arxiv.org/abs/0909.5177v1 <small><b>arXiv:0909.5177v1</b></small>]</ul>

<ul>
<li> G. Shen, S. Pattem and A. Ortega, "Energy-efficient Graph-based Wavelets for Distributed Coding in Wireless Sensor Networks". <i>In Proc. of 2009 IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP'09),</i> Taipei, April 2009.
[http://biron.usc.edu/~godwinsh/Papers/ICASSP09_Broadcast.pdf <small><b>PDF format</b></small>]</ul>

<ul>
<li> G. Shen, S. Narang and A. Ortega, "Adaptive Distributed Transforms for Irregularly Sampled Wireless Sensor Networks". <i>In Proc. of 2009 IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP'09),</i> Taipei, April 2009.
[http://biron.usc.edu/~godwinsh/Papers/ICASSP09_Filter_Opt.pdf <small><b>PDF format</b></small>]</ul>

<ul>
<li> G. Shen and A. Ortega, "Optimized Distributed 2D Transforms for Irregularly Sampled Sensor Network Grids Using Wavelet Lifting". <i>In Proc. of 2008 IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP'08),</i> Las Vegas, April 2008.
[http://biron.usc.edu/~godwinsh/Papers/ICASSP08ShenOrtega.pdf <small><b>PDF format</b></small>]</ul>


== Related Links ==
* [http://anrg.usc.edu/SenZip/ SenZip]
* [http://biron.usc.edu/wiki/index.php/CompressionGroup/DSNProject Distributed Compression for Sensor Networks]
* [http://biron.usc.edu/wiki/index.php/CompressionGroup/ Compression Research Group]


== Acknowledgements ==
* This work was supported in part by NASA under grant AIST-05-0081