Organisation internationale de normalisation

Profile/level definitions (1)

Discussed in joint meeting with parent bodies Mon 16-18: One profile “3D Main” was agreed.Technical aspects are to be further discussed in JCT-3V, nested capability (i.e. decodability of MV Main) shall be implemented, which implies auxiliary pictures.

13.0.1.1.1.1.1.1.13JCT3V-J0106 Initial text for the specification of profiles, tiers, and levels in 3D-HEVC [G. Tech, K. Müller (HHI)] [late]

Initial text for the specification of profiles, tiers and levels in 3D-HEVC is provided, which was further discussed and refined at the meeting.

The current 3D-HEVC Draft 9 does not include text defining profiles, tiers and levels. To fill this gap an initial specification is provided in this document, which can be the basis for further discussion. The profile specification is based on the Multiview Main profile and has been modified to cover 3D-HEVC related aspects.

It was agreed to allow only monochrome for depth maps (chroma_format_idc equal to 0 if the SPS belongs to a depth map).

It was agreed to only allow auxiliary pictures with main profile decoding capability. Such auxiliary pictures should however be allowed to appear together with 3D-HEVC pictures and depth maps.

It was agreed to remove the constraint about 2 views.

It was agreed to remove the vertical disparity constraint. Due to the fact that more dependencies exist, and the constraint was enabled for parallelism in independent decoding processes, this is not necessary, but releasing the constraint also does not break decodability of MV-HEVC streams by 3D-HEVC decoders.

Agreed to keep the number of dependent layers to 4, but this may need to be re-considered when it includes texture/depth dependencies.

Agreed to restrict flexible coding order (i.e. only allow texture first), but further consideration may be necessary, as some tools have benefit also with independent coding of depth maps. (Aux_id needs to be added here)

Question: Is depth-only allowed? Currently not. May need further consideration.

Setting of max_monochrome_constraint_flag. Should be set to zero.

The contributor was requested to prepare a new version, which was presented during the plenary Friday AM. It was decided to require for each view that the depth layer follows the texture layer directly, as in current CTC. The other option (de-interleaved texture/depth layers) should be further studied.

Generally agreed to be adopted for draft.

Decision: Adopt JCT3V-J0106 (version 2 with the restriction as indicated above)

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