Improved H.264 video coding scheme
Xueming Li · Jisuanji gongcheng yu sheji · 2005
An improved H.264 video coding scheme is brought forward. According to the seven block modes of motion estimation in H.264, this new scheme applies an extending concept of transform coding called adaptive block transform (ABT) to inter prediction which associates the block size of motion estimation with that of the transform. As the high complexity being taken into account, the original ABT is simplified and adapted to meet the practical situation by restricting the maximal transform size. Meanwhile, intra pre- diction is also adjusted to accommodate the simplified ABT. In terms of the different probability distributions corresponding to the trans- formed coefficients of different block size, an adaptive universal variable length coding method with dynamic code table remapping is adopted to further improve the coding efficiency. The detailed description of the scheme is presented with the performance compared to current H.264. As a result of the simulation, the proposed scheme has significant capability at high bitrates, where maximal 2dB PNSR gain can be achieved.