JVET-AD0081 Non-EE2: An extrapolation filter-based intra prediction mode [L. Xu, Y. Yu, H. Yu, D. Wang (OPPO)]

This contribution proposes an extrapolation filter-based Intra Prediction (EIP) mode. First, the extrapolation filter coefficients are obtained from the neighbouring reconstructed pixels of the current block with a pre-determined template. Then, the extrapolation is processed position by position from top-left to bottom-right within the current block to form a prediction block. The proposed method was implemented on top of ECM-8.0 software. The simulation results are summarized as follows,

AI: -0.27%/-0.19%/-0.20% Y/U/V, 108%/101% EncT/DecT,

RA:

9 different configurations are possible (selecting the reconstructed area) for determining the coefficients (algorithm similar as CCCM). The selected set is signalled, and coefficients are determined at decoder for only the signalled one. Therefore, the encoder runtime is more increased than decoder.

MTS similar to MIP.

It is pointed out that a significant number of cycles may be needed to compute the prediction. It might be necessary to disable for large block sizes.

It was agreed to study this in an EE. Also investigate restriction to smaller blocks. Reduction of encoding runtime should be studied,