Basic HTML version of Foils prepared 9 April 98

Foil 9 Wavelet image compression

From Command and Control Application in CIV Project Rome Laboratory CIV Final Review -- 9 April 98. by Marek Podgorny, Geoffrey Fox
Technology:
  • 9,7 biorthogonal filters, dyadic decomposition, floating point transform
  • zerotree quantization, order-1 adaptive arithmetic coder
Tradeoffs:
  • advantages: embedded format (streaming), fast decoding in smaller resolutions (search, thumbnails), distortions forgivable by human visual system (space/frequency balance), high compression ratios and good quality
  • disadvantages: computationally expensive (video), lossy even at low ratios (medicine)

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