Image coding with windowed modulated filter banks

Jelena Kovacevic, Didier J. Le Gall, Martin Vetterli

Research output: Contribution to journalConference articlepeer-review


Lapped orthogonal transforms (LOT) have been introduced to provide a solution to the problem of blocking that occurs with transform coding at low bit rate. For the purpose of image coding, a more general class of exact reconstruction filter banks, which that provides an additional degree of freedom in controlling ringing while relaxing the symmetry constraints of LOTs, is introduced. It is shown that windowed modulated filter banks are a very attractive candidate for image coding, since by allowing almost arbitrary selection of the window, they provide a control of the impulse response of the filters in the filter bank. The outputs of the windowed, modulated filter bank are quantized and entropy-coded in a way analogous to DCT (discrete cosine transform) coefficients. Comparisons are made between the filter bank and the DCT from the point of view of mean square error and subjective quality.

Original languageEnglish (US)
Pages (from-to)1949-1952
Number of pages4
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
StatePublished - 1989
Event1989 International Conference on Acoustics, Speech, and Signal Processing - Glasgow, Scotland
Duration: May 23 1989May 26 1989

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering


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