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In this paper, the feasibility and efficiency of noncausal
prediction in a Pframe is examined, and based on the
findings, a new Pframe coding scheme is proposed. Motioncompensated
interframe prediction, which has been used
widely in lowbitrate television coding, is an efficient method
to reduce the temporal redundancy in a sequence of video
signals. Therefore, the proposed scheme combines motion
compensation with noncausal prediction based on an interpolative,
but not Markov, representation. However, energy
dispersion occurs in the scheme as a result of the interpolative
prediction transform matrix being nonorthogonal. To
solve this problem, we have introduced a new conditional pel
replenishment method. On the other hand, Rotation Scanning
is also applied as feedback quantization is the quantizer
in this paper. Simulation results show that the proposed coding
scheme achieves an approximate 0.3–2 dB improvement
when the entropy is similar to the traditional hybrid coding
method.
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