Method and apparatus for encoding an image into a video bitstream and decoding corresponding video bitstream with weighted residual predictions

摘要

Method and device for encoding an image according to a scalable encoding (SVC) scheme having an enhancement layer and a reference (or base) layer. The method comprises obtaining a block predictor candidate for predicting a coding unit within the enhancement layer and an associated first residual block corresponding to the prediction 5.1. A block predictor is determined in the reference layer that is co-located with the obtained block predictor candidate in the enhancement layer 5.2. The determined block predictor in the reference layer is used to determine a second residual block that is associated with a coding unit in the reference layer that is co-located with the coding unit in the enhancement layer 5.3. Finally a residual block is determined for the coding unit of the enhancement layer that corresponds to the difference between the first and the second residual blocks. A weighting factor is applied to at least one element among the obtained block predictor candidate, the determined block predictor and the reference layer residual block. Also disclosed is corresponding decoding method and device. The invention gives better handling of differences between enhancement layer motion and motion of the co-located block in the reference layer.