Basic HTML version of Foils prepared November 29 98

Foil 13 Wavelets

From 3D Geographical Information Systems in Tango CEWES Tango Training -- November 17-18 98. by Remek Trzaska, Pawel Roman, Chris Walczak, Marek Podgorny
Wavelet decomposition extracts the most important information (low frequencies) and less meaningful details (higher frequencies)
to compress the wavelet coefficients we use Embedded Zerotree Algorithm:
  • the coefficients describing low frequencies are placed in the front of the stream, higher frequencies are placed further;
  • the coefficients can be roughly approximated using only the beginning of the stream, further part of the stream provides additional refinement information.

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