Discrete Sine Transform-Based Interpolation Filter

High Efficiency Video Coding (HEVC) uses an 8-point filter and a 7-point filter, which 7 are based on the discrete cosine transform (DCT), for the 1/2-pixel and 1/4-pixel interpolations, 8 respectively. In this paper, discrete sine transform (DST)-based interpolation filters (IF) are 9 proposed. The first proposed DST-based IFs (DST-IFs) use 8-point and 7-point filters for the 10 1/2-pixel and 1/4-pixel interpolations, respectively. The final proposed DST-IFs use 12-point and 11 11-point filters for the 1/2-pixel and 1/4-pixel interpolations, respectively. These DST-IF methods 12 are proposed to improve the motion-compensated prediction in HEVC. The 8-point and 7-point 13 DST-IF methods showed average BD-rate reductions of 0.7% and 0.3% in the random access (RA) 14 and low delay B (LDB) configurations, respectively. The 12-point and 11-point DST-IF methods 15 showed average BD-rate reductions of 1.4% and 1.2% in the RA and LDB configurations for the 16 Luma component, respectively. 17