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Non-EE2: Reconstruction-Reordered IBC for screen content coding
Abstract
This contribution proposes a Reconstruction-Reordered IBC (RR-IBC) mode for screen content video coding. When it is applied to an IBC coded block, the reconstruction block is flipped. Two symmetric flip methods, horizontal flip and vertical flip, are supported for RR-IBC coded blocks. Syntax flags are signalled for IBC AMVP, indicating whether the reconstruction block is flipped and how to flip it. For IBC merge, the flip type is inherited from neighbouring blocks without signalling. Moreover, a motion shift is added to a block vector candidate obtained from a neighbouring block according to a symmetric rule, in case that the neighbouring block is coded with RR-IBC. Simulation results based on ECM-4.0 are reported as below:
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