On intra coding using mode dependent 2D-KLT

H.265/HEVC intra coding scheme allows up to 35 prediction modes. In this paper, we propose intra-mode dependent residual transform using 2D-KLT for 4×4, 8×8, 16×16 and 32×32 blocks. Unlike H.265/HEVC and former standards, the transform is not separable and has higher degree of freedom. It does not require coefficient scanning process. Preliminary results demonstrate BD-rate gain of up to 2.30% (average except screen contents), 2.35% (all average) and 12.67% (maximum) compared to HM10.0 anchor.