| JCTVC-M0117 Non-SCE1: Weighted intra prediction [C. Kim, B. Jeon (LG)]
This contribution presents weighted intra prediction (WIP) that uses reconstructed base layer texture to improve the enhancement layer sample predictor. It is only applied on intra CU. A CU level on/off flag is signalled for WIP. Simulation results reportedly show 0.2% and 0.1% BD-rate savings on average for AI-2x and AI-1.5x, respectively, compared with SHM 1.0 anchors.
Interesting, but gain does not seem significant.
JCTVC-M0374 Non-SCE1: Cross-check for weighted intra prediction (JCTVC-M0117) [D.-K. Kwon (TI)] [late]
JCTVC-M0139 Non SCE1 : Inter-layer Intra Mode Prediction [X. Zuo, L. Yu (Zhejiang University)]
This contribution presents a method to exploit the correlation of intra modes from different layers to improve the coding efficiency of the enhancement layer (EL) in SHVC. It uses both the intra modes of EL neighbors and the collocated base layer (BL) block to predict that of EL block by adding them into the EL MPM list (denoted as MPM[x] with x=0, 1, 2). Two methods of how to rank these intra modes in the MPM list are described in this contribution. It is reported that 0.5% and 0.1% gain can be achieved for enhancement layer stream in AI 2x and AI 1.5x cases, respectively, with both methods.
For the presented two methods, the second method seemed better.
The proposal seemed roughly similar in concept to several things tested in SCE 1. For example, there is one method in the SHM, and there is one in M0326, and there is a removal of the MPM process using differential coding of the EL mode relative to the BL mode. The various methods tend to have about 0.3% gain. This proposal had a somewhat more elaborate scheme with reportedly a (very) little bit better compression performance.
It was noted that storage of the BL intra mode requires some memory.
No action.
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