A wavelet codec with overlapped motion compensation for very low bit-rate environment

The paper describes theories on overlapped motion compensation and their applications to a wavelet codec aimed for the 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 the cascaded wavelet transform are introduced. Finally, the implementation of the codec on a video image signal processor (VISP) is discussed. >

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