Basic HTML version of Foils prepared 22 February 97

Foil 4 Wavelets

From 3D Geographic Information System Rome Lab Quarterly Review for CIV -- October 1 96. by Remek Trzaska, Pawel Roman, Chris Walczak *
1 Wavelet decomposition extracts the most important information (low frequencies) and less meaningful details (higher frequencies)
2 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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