A Wavelet Codec with Overlapped Motion Compensation for Very Low Bit-Rate Environment

Jiro Katto, Jun Ichi Ohki, Satoshi Nogaki, Mutsumi Ohta

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This paper describes theories on overlapped motion compensation and their applications to a wavelet codec aimed for very low bit-rate environment below 64 kb/s. The theories are concerned with the evaluation of prediction efficiency improved by overlapped motion compensation and also its smoothing effect on the discontinuities at block boundaries encountered when motion vectors do not coincide among neighboring blocks. They contribute to determine the optimum window shape for overlapped motion compensation in a developed wavelet codec, which suffers from reduction of coding efficiency when there are such discontinuities in a signal to be transformed. Regarding the wavelet codec, a new scanning method of transform coefficients and alternate use of normal and spatially-reversed basis functions for cascaded wavelet transform are introduced. Finally, the implementation of the codec on a Video Image Signal Processor (VISP) is discussed.

Original languageEnglish
Pages (from-to)328-338
Number of pages11
JournalIEEE Transactions on Circuits and Systems for Video Technology
Issue number3
Publication statusPublished - 1994 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Media Technology
  • Electrical and Electronic Engineering


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