Spatially scalable video encoding and decoding

Details Spatially scalable video encoding and decoding Spatially scalable video encoding and decoding

H - Electricity

04

N

H04N 7/12 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2127151

24 SPATIALLY SCALABLE VIDEO ENCODING AND DECODING Abstract of the Disclosure Video images of varying resolutions are derived from one video signal with high bandwidth efficiency, in accordance with the principles of the invention, by employing a new two-layer video coding technique using spatial scalability in which the prediction taken from one layer is combined with the prediction taken from the other layer, and the combined prediction is used to code one of the layers. In an illustrative example of the invention employing a base-layer and an enhancement-layer, the spatially interpolated base-layer is combined, by the selection of appropriate weights, with the motioncompensated temporal prediction of the enhancement layer to generate the prediction used to encode the enhancement-layer. Weights are selected based on a calculation of the sum of the absolute differences, or the sum of the squares of the differences between the prediction and reference macroblocks to produce the prediction giving the best bandwidth efficiency. This weighting process is called spatio-temporal weighting. (FIG. I )

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