JVET-L0155 CE3-related: Most Frequent Mode (MFM) for Intra Mode Coding [Y.-U. Yoon, D.-H. Park, J.-G. Kim (KAU), J. Lee, J. Kang (ETRI)]
At the last meeting, 3 MPMs and 67 modes are adopted in VTM 2.0.1 software. As the number of intra modes are increased, more efficient coding of intra mode is require. This contribution proposes the most frequent mode (MFM) for intra mode coding. The MFM means the most frequent mode to be derived from neighbours and is indicated by MFM_FLAG. The decoder parses MFM_FLAG and derives one mode from neighbours if MFM_FLAG is true, otherwise, parses MPM_FLAG. This contribution reports the performances on three test including the MFM in the RD-check list and adjusting the number of RD-checks for the MPM. Based on the same number of RD-checks as the current VTM-2.0.1 software, the proposed method reportedly shows 0.28% bitrate saving without increase of encoding/decoding running time.
No RA results had been provided yet
This is kind of “4 MPM”=”MFM+3MPM”. It has more context coded bins than the currently investigated 6 MPM proposals, and also higher complexity in deriving the MFM+MPMs. Performance when coding runtime is not increased is similar to 6 MPM proposals as well (around 0.3%).
No action was taken on this at this point.