Gain normalization of lifted filter banks

  • Authors:
  • Christopher M. Brislawn;Brendt Wohlberg

  • Affiliations:
  • Computer and Computational Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545-1663, USA1;Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545-1663, USA

  • Venue:
  • Signal Processing
  • Year:
  • 2007

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Abstract

The DC and Nyquist responses of the filters in a two-channel perfect reconstruction filter bank are expressed in terms of the lifting filters in a lifting decomposition. The computation makes use of the cascade-form representation of lifting steps as lower- and upper-triangular factor matrices in the polyphase-with-advance representation. A functional relationship is derived connecting the DC and Nyquist responses via the polyphase determinant, and it is shown that the responses for a lifted filter bank can be computed recursively using the DC responses of the lifting filters. These results are applied to derive the filter bank normalization specifications in Part 2 of the ISO/IEC JPEG 2000 still image coding standard.