VERY-LOW BIT-RATE COLOR VIDEO CODING USING ADAPTIVE SUBBAND VECTOR QUANTIZATION WITH DYNAMIC BIT ALLOCATION

In this correspondence a novel adaptive vector quantization (VQ) based subband coding scheme for very low bit rate coding of video sequences is presented, Overlapped block motion estimation/compensation is empl oyed to exploit interframe redundancy. A two-dimensional (2-D) wavelet transform (WT) is applied ro the resulting displaced frame difference (DFD) signal. The WT coefficients are encoded using an adaptive subba nd vector quantization (ASBVQ) scheme in combination with a dynamic bi t allocation strategy based on marginal analysis. Fixed rate co;ling i s provided. Comparative experimental results of the ASBVQ codec with t he H.261 and the recently defined H.263 video coding standards are giv en.