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Intra prediction with 1D macroblock partitioning for image and video coding

The H.264/AVC1 standard of the Video Coding Experts Group (VCEG) and the Moving Pictures Experts Group (MPEG), also known as MPEG-4 AVC, achieves significant compression gain compared to its predecessors. Not only Inter yet also Intra coding has been greatly improved. Today VCEG encourages coding efficiency improvements through the KTA (Key Technical Area) software,2 a collection of tools that improves the H.264/AVC standard, to prepare the next generation video codec. The work proposed in this paper has been designed in this context. An Intra coding scheme is proposed. A macroblock is split in 1D partitions to reduce the distance between the pixel to encode and its predictors. Three scan orders for the partitions are available: a raster scan, a bidirectional scan and a hierarchical scan. Predictors adapted to the shape and characteristics of the 1D partitions are defined and finally a 1D-DCT is applied to the residual signal. Experimental results report an average bitrate savings of 8.6% compared to the H.264/AVC standard (up to 19% on a particular sequence).