Inter-layer intra mode coding for the scalable extension of HEVC

In this paper, two inter-layer intra mode coding tools are proposed for the all intra spatial scalable extension of High Efficiency Video Coding (HEVC). The proposed methods make use of the correlations between intra prediction mode information in base layer and enhancement layer to improve the intra mode coding in enhancement layer. The first approach directly utilizes the intra prediction mode from the corresponding prediction unit (PU) in base layer as the intra prediction mode of the enhancement layer PU, while the second approach uses the intra prediction mode of the corresponding base layer PU as an additional most probable mode candidate. Dyadic all intra spatial scalability with 2 layers is tested in our experiments. Compared to enhancement layer only, the experimental results show a maximal 1.2% luma BD-rate reduction for the test sequences relative to inter-layer intra prediction.