METHOD FOR DECODING A STREAM OF CODED DATA REPRESENTATIVE OF A SEQUENCE OF IMAGES AND METHOD FOR CODING A SEQUENCE OF IMAGES

摘要

The invention relates to a method for decoding a stream of coded data (F) representative of a sequence of images comprising the following steps for a current block: reconstructing (10) a residual block, determining (12) a prediction block, and reconstructing (14) the current block by merging the residual block and the prediction block weighted by a weighted prediction parameter. According to the invention, the weighted prediction parameter is determined as follows: calculating (2) the average of the prediction block (avrpred), reconstructing (4) a DC coefficient of the current block (IresDC), calculating (6) an average (avrcr_dec) of the current block from the average of the prediction block (avrpred) and the DC coefficient (IresDC), and calculating (8) the weighted prediction parameter being the ratio of the average of the current block and the average of the prediction block (avrpred). The invention also relates to a method for coding.