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JVET-N0468 3 (m47130)

14th Meeting: Geneva, March 2019 2019-03-23 17:20

AhG2 : Editorial Suggestion on the text specification for Inter and IBC mode

Authors: Hyeongmun Jang LGE Junghak Nam LGE N. Park LGE J. Lim LGE S. Kim LGE

Abstract

In VTM4.0, IBC mode is signalled as a separate CU prediction mode, and IBC mode has its own candidate list including IBC coded spatial neighbor blocks. This contribution introduces editorial suggestions to VVC WD specification for clarifying regarding IBC mode addition.

Meeting Notes

JVET-N0468 AhG2: Editorial suggestion on the text specification for inter and IBC mode [H. Jang, J. Nam, N. Park, J. Lim, S. Kim (LGE)]

In VTM4.0, IBC mode is signalled as a separate CU prediction mode, and IBC mode has its own candidate list including IBC coded spatial neighbour blocks. This contribution introduces editorial suggestions to VVC WD specification for clarifying regarding IBC mode addition.

The proponent said that all suggested changes are editorial in nature. Suggested changes are for inter and intra block copy, as follows:

#1. Derivation process for spatial merging candidates from the neighbouring spatial blocks which is coded MODE_INTER.

#2. Derivation process for spatial motion vector predictor candidates from the neighbouring spatial blocks which is coded MODE_INTER.

#3. Derivation process for IBC spatial merging candidates from the neighbouring spatial blocks which is coded MODE_IBC.

It was suggested that VTM software functions correctly, but the corresponding checks performed in the software are missing from the VVC draft spec.

The proponent said that they were not able to trace back to the contribution(s) that caused the mismatch between text and software.

The proponent suggested some text changes to fill in the missing part. The proponent also said that they had offline conversation with B. Bross. B. Bross confirmed that some problems exist in this part of the draft spec.