Intra Prediction Mode Mapping Methods for BV-Based Prediction Tools Beyond VVC

The Joint Video Experts Group (JVET) conducts exploration research on technologies for the next-generation video coding standard beyond VVC, using the Enhanced Compression Model (ECM) as reference software. ECM integrates both extended and newly developed coding tools. These include BV-based prediction tools like IntraTMP, as well as modederivation tools such as TIMD and TMRL, which utilize intra prediction mode lists. In the current ECM, intra prediction mode lists are constructed using modes of neighboring blocks, and IntraTMP is conventionally mapped to the Planar mode, limiting diversity. This paper proposes a unified mapping framework that derives the IPM of BV-based prediction tools—IntraTMP as well as IBC—by referencing the intra mode of the block indicated by the BV. In addition, a multiple-position mapping strategy is introduced for IntraTMP to exploit several reference positions within the reference block. Experimental results show that the proposed method achieves a 0.03% BD-rate reduction in the luma component, demonstrating a slight coding efficiency through enhanced intra prediction mode diversity.