| 摘要 |
When a DPCM encoded video signal is spatially subsampled in order to reduce the amount of information that must be transmitted, the values of nontransmitted picture elements (pels) must nevertheless be reconstructed at both transmitter and receiver. In accordance with the present invention, reconstructed values are obtained by interpolation between nearby transmitted elements only in unpredictable ones of the picture. In regions where prediction errors are low, the predicted value of a nontransmitted element is instead used as a basis for the reconstruction. Increased efficiency is thus achieved at little increase in complexity, since the same prediction required for DPCM encoding is used for reconstruction of nontransmitted pels.
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