SHVC (16) General (2)
Discussed 01-09 p.m. (JRO).
14.1.97.1.1.1.1.1.268JCTVC-P0208 SHVC upsampling ratio constraint [K. Misra, A. Segall (Sharp)]
This contribution proposes a bitstream constraint on the upsampling ratio for SHVC. It was reported that the current SHVC draft allows the ratio of dimensions of the reference layer picture and its scaled representation to be greater than 1. In such an event the SHVC decoder operation was asserted to not be clear. The proposed bitstream constraint would bound this ratio to be less than or equal to 1.
Revision1 of the document includes the proposed bitstream constraint language.
Discussion: There is no technical problem in the current draft spec and software about supporting enhancement layer resolutions that are lower than the base layer resolution. There seemed to be no harm in allowing it.
No action.
14.1.97.1.1.1.1.1.269JCTVC-P0209 On chroma format scalability using spatial scaling [K. Misra, S. Deshpande, A. Segall (Sharp)]
This contribution proposes enabling chroma format scalability within the existing SHVC design through the use of spatial scalability. It is asserted that the desired functionality can be enabled with the proposed text.
This is not relevant for Scalable Main Profile. It could become relevant for a later combination (e.g. with Main Profile as base layer and some RExt based decoder in the enhancement layer). However, it should be a simple exercise to re-write the re-sampling process in a way that it supports different ratios for luma and chroma.
Further consideration would only be reasonable once a concrete request for an application case is made, and after RExt is finalized.
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