Basic HTML version of Foils prepared 22 February 97

Foil 6 All-pass Filters

From Wavelet Video Compression Rome Lab Quarterly Review for CIV -- October 1 96. by Miguel del Rosario *
1 All-pass polyphase filters:
  • All-pass filters are IIR a opposed to FIR for QMF filters.
  • Non-causal requirement for perfect reconstruction nullified due to finite extent of images.
  • All-pass polyphase design reduces high order QMF filter bank to 0th and 1st order filters (much lower complexity).
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