METHOD FOR DECODING A SCALABLE VIDEO BIT-STREAM, AND CORRESPONDING DECODING DEVICE

摘要

The invention relates to video compression of scalable video (11). Where the base layer (14) is decoded using temporal prediction and the enhancement layer (20) has no temporal prediction, the decoding of the enhancement layer comprises: decoding (331), from the bit-stream EBS, and dequantizing (332) DCT coefficients formula (I) of the enhancement layer; using the motion information Ml of the base layer to predict (405) coefficients of the enhancement layer; and transforming the predicted coefficients into DCT predicted coefficients Y; using parameters a,ß in the bit-stream to obtain a probabilistic distribution GGD(ai,ßi) of the DCT coefficients; obtaining a probabilistic distribution GGD(an,ßn) of the differences between the dequantized DCT coefficients formula (I) and the DCT predicted coefficients Y; and merging (38) these coefficients, based on the obtained probabilistic distributions. This improves the rate-distortion ratio of encoded scalable video.