Video-signal coder with dpcm and adaptive prediction

Details Video-signal coder with dpcm and adaptive prediction Video-signal coder with dpcm and adaptive prediction

H - Electricity

04

N

350/33

H04N 7/36 (2006.01) G06T 9/00 (2006.01)

Patent

CA 1321010

Abstract Video-Signal Coder with DPCM and Adaptive Prediction For a video-signal-coding facility using adaptive DPCM in which switching is effected block by block between different predictors, a circuit configuration is given for the case where switching is to be effected between a two-dimensional intraframe predictor and a pure interframe predictor (Fig. 1). Uniform processor elements (PE1, PE0) cooperate with predictor loops (Pr1, Pr2, 10, 11), and means are provided which ensure that the appropriate reconstructed sample values (x0', x1') are used after switching has been effected. The values of the intraframe prediction are calculated in two separate loops, as is known per se. In a preferred embodiment (Fig. 3), the decision on the best suited coder is de- layed by one block, whereby the maximum processing speed is substantially increased. Means (PE2, 12, 13, S3, S4, S4') are provided which ensure that even in case of such a delayed decision, the correct recon- structed sample values (x0', x1', x2') are used after a switchover. P.Pirsch 5

564436

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