JVET-AP0111 AHG9: On spatial quality optimization in EOI SEI message [C. Kim, H. Tan, J. Lee, J. Nam, J. Lim, S. Kim (LGE)]

This contribution proposes additional signalling for spatial quality optimization in the encoder optimization information (EOI) SEI message. The proposed aspects are as follows:

• Item 1: To indicate the type of spatial quality optimization
• Item 2: To indicate the component(s) affected by spatial quality optimization
• Item 3: To indicate the impact level on spatial characteristics

In version 2, the name of the syntax proposed in Item 3 was incorrectly specified and has been corrected.

For item 1, it was suggested that the proposed semantics language is vague.

The existing semantics language doesn’t specify

For item 2, it was questioned why u(8) is used for bit masks for 3 colour components, and if the chroma components would be optimized separately.

For item 3, the quality indication is to describe pre-processing applied prior to encoding.

The decoder side impact of having this information is not clear.