| JCTVC-B066 [S. Sekiguchi, K. Sugimoto, S. Yamagishi, Y. Yamada (Mitsubishi)] Report of Super Hi-Vision coding performance
This contribution reported the performance of Super Hi-Vision (SHV) coding with the design proposed in JCTVC-A107. That design supports fundamental coding tools that are similar to those that have been proposed in several CfP submissions and adopted in the TMuC at the last (Dresden) meeting. Experimental results reported in this document were asserted to show that use of these tools contributes to significant coding gain for super high vision (SHV) source video, which is an area of focus for the HEVC standard.
Substantial gain on such video was reported. The use of an extended block size and adaptive Wiener filtering were asserted to be important to this gain.
The contribution compared the JCTVC-A107 design against AVC anchors for the 8Kx4K test sequences "Steam Locomotive" (SL) and "Nebuta Festival" (NF). Roughly 57% BR reduction was reported for SL, and 25% for NF. It was reported that a substantial amount of larger-size blocks were used for both intra and inter coding in these experiments.
There was some discussion about the source video sequences.
Nebuta is a night capture – very noisy
The original video for this content was shot using quincunx sampling and then interpolation upsampling, while full sampling would be preferable. However, the provider indicated that this should not be a major problem. Eventually, source video from a full resolution 8Kx4K camera may become available, although it may contain significant source noise due to sensor characteristics. It was suggested that HEVC should be designed for robustness to such noise.
It was remarked that noise robustness seems to be increased by increasing the coding block sizes.
The study of coding behavior of the TMuC design on SHV sequences was suggested.
A participant remarked that the search range used in the experiments might be somewhat small for SHV. In regard to the "steam locomotive train" video sequence in particular, it was remarked that the motion search range for this sequence should be very large. 128x128 search range appears low for the case of 8Kx4K.
It was asked whether the SHV sequences have been studied to determine their actual native resolution: is the effective detail of the sequences really matching with 8Kx4K resolution? This does not seem to have yet been fully studied.
Further study of SHV coding behavior, especially in the TMuC context, was encouraged.
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