Patent ID: 8325804
Filing Date: 2012-12-04
Classification: H04N

Abstract:
1. Method for coding a sequence of pictures using predictive intra directional coding modes privileging different prediction directions, for coding a block of a picture, wherein for the determination of the coding mode of a macroblock constituted of picture blocks, the method carries out a pre-selection of intra directional predictive, or DC predictive coding modes of the blocks of a macroblock according to steps comprising: calculation of gradient activities of a block in the prediction directions, calculation of DC activity of a block that is a weighted average of the gradient activities in the different prediction directions for the block, pre-selection of intra directional coding mode(s) of a block for which the directions correspond to the gradient activity or activities of minimum value if the DC activity is higher than the minimum gradient activity or activities or pre-selection of the DC predictive mode in the contrary case.