Affine SKIP and MERGE modes for video coding

The latest video coding standard HEVC has already improved 40% coding efficiency than H.264/AVC, but it still follows the hybrid coding structure with the translational motion compensation scheme. In this paper, an affine motion representation is described first. The proposed algorithms to improve the motion vector coding for Affine SKIP/MERGE modes are also presented. The experimental results show that these algorithms can achieve on average 3.5%, 2.2%, and 1.4% BD-rate gains for low delay P, low delay B, and random access configurations, respectively, compared to HM 12.0. The BD-rate saving is up to 17.1% for sequences with complex motion.