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16th Meeting: Geneva, October 2019 2019-09-24 22:06
AHG8: Support of ROI (Region-Of-Interest) scalability
Authors: T. Lu Dolby F. Pu Dolby P. Yin Dolby Sean McCarthy Dolby W. Husak Dolby T. Chen Dolby
Abstract
This contribution proposes syntax to support region of interest (ROI) scalability in VVC. The proposed syntax uses the cropping parameter specified in the picture parameter set (PPS) multilayer extension syntax of SHVC. With the proposed syntax, both adaptive resolution change (ARC) within the same layer and ROI scalability for different layers can be supported by use of the existing reference picture resampling (RPR) mechanism. The required decoding process change is minimal: It only requires modification of the resampling scaling factor calculations (equation 8-753 and 8-754).
Meeting Notes
JVET-P0336 AHG8: Support of ROI (Region-Of-Interest) scalability [T. Lu, F. Pu, P. Yin, S. McCarthy, W. Husak, T. Chen (Dolby)]

In SHVC we have the proposed functionality, illustrated below. A basic functionality is to have controllable spatial offsets and scaling between the reference layer and the enhancement layer. The proposal might also involve having some different treatment based on location within enhancement layer. It might also involve changing the bounding box of picture extrapolation for motion compensation.

It was commented that JVET-P0219 and JVET-P0482 for RPR are related.

Further clarity on the details of what is proposed and consideration of such details is needed.

See the notes for the HLS BoG report JVET-P0968; this was planned for further study.

VPS and single-layer bitstreams/decoders (2)

Discussed Tuesday 1950 (GJS).

At the previous meeting, we had agreed in principle for VPS syntax to not be required to be present in a single-layer bitstream (and we actually had an ability to not have the VPS present, but did not properly specify what happened in that case).

References:
JVET-O0335 JVET-O0336 JVET-O2001
Cited:
JVET-P0008 JVET-P0968 JVET-R0217
ARCHIVE v1 :
JVET-P0336-specification-on-JVET-O2001-vE.docx JVET-P0336_ROI_scalability-v1.docx
Decisions
At the previous meeting, we had agreed in principle for VPS syntax to not be required to be present in a single-layer bitstream (and we actually had an ability to not have the VPS present, but did not properly specify what happened in that case).
Citation