Frame Context Dependency of Intra-Prediction Modes of H.265/HEVC: An Analytical Study

The continuous increase of applications supporting the Ultra High Definition (UHD) resolution limits the use of current video coding standard (Advance Video Coding) AVC. To provide the considerably better coding efficiency as compared to the existing video coding standards, a next generation video coding standard High Efficiency Video Coding (HEVC) is released. HEVC introduces the concept of flexible Coding Unit (CU) size, and the number of intra-prediction angular modes i.e. 35. The newly introduced features highly contribute to the better performance of HEVC, but they also significantly increase the computational complexity. In this paper, a frame context based study of intra-prediction modes is carried out to investigate the behavior of different modes over different context frames, so that, the HEVC complexity reduction work can be abetted. As a performance metric, the frequency of different modes over different textured images and Sum of Absolute Difference (SAD) for randomly selected Prediction Blocks (PBs) are pictorially presented.