JVET-F0055 Non-EE1: Explicit flag signalling for ARSS [V. Seregin, X. Zhao, M. Karczewicz (Qualcomm)]

This contribution proposes to indicate ARSS mode with a flag that is explicitly signalled instead of hiding it in the transform coefficients. Simulation results reportedly show 0.0% luma BD-rate change with 93% encoder running time on average for AI configuration. A combination with an ARSS explicit flag and EE1 Test1 and Test6 is also tested in this contribution.

The ARSS flag is signalled explicitly, and only signalled if the block has at least 3 coefficients

Following results are reported:

• Using the method standalone, reducing enc RT by 7%, no loss
• Using in combination with UWP (EE1 test 1), reducing enc RT by 7%, 0.1% BR reduction
• Using in combination with UWP and ARSS restrictions of EE1 test 6, enc. RT −20%, no loss.

Combination of the method with ARSS restrictions from EE1 test 6 seems to be an interesting tradeoff point. Further study in an EE was suggested.

Side activity (organized by E. Alshina) was requested to further discuss test cases in a next cycle of EE, including elements of F0024, F0033, F0054, F0055.