Abstract
Block motion compensation (MC) is widely used in hybrid coding schemes. The presence of motion discontinuities inside the blocks reduces the performances of the method. Moreover the displaced frame difference (DFD) image shows block discontinuities. This is the main difficulty in using block based MC in subband coding systems. This limitation does not appear in transform based algorithms, where the boundaries of the transform support coincide with the MC block boundaries. Overlapped window motion estimation and compensation have been proposed to overcome these limitations leading to a reduction of the DFD energy and of the blocking artifacts. Overlapped MC is equivalent to a linear combination of predictor based on neighboring block motion vectors. In this paper we extend the motion compensation scheme of MPEG2 with new overlapped window modes. We report the improvements achieved in terms of DFD energy reduction and block boundaries reduction. Then a complete hybrid coding system based on subband decomposition is defined to evaluate the performances of the extended MC scheme in terms of bit rate reduction, SNR, and perceived visual quality.
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