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Other technical contributions on coding layer
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Other technical contributions on coding layer
15.0.1.1.1.1.1.1.282JCT3V-E0064 On low-delay checking process for MV-HEVC [X. Xiu, Y. Ye, Y. He, Y. He (InterDigital), Y. Lin, X. Zheng, X. Chen, J. Zheng (HiSilicon)] In this contribution, the low-delay checking process in MV-HEVC is modified to reportedly improve the efficiency of temporal motion vector prediction (TMVP) for dependent view coding. More specifically, the low-delay flag is set to true if inter-view reference picture is used as the co-located picture for the TMVP derivation, such that the motion vector (MV) of the co-located prediction unit (PU) always comes from the same reference picture list of the target MV of the current PU for better TMVP prediction. The proposed modification is a slice-level change as the low-delay flag is determined per slice and referred to by all the PUs of a coded picture. Experimental results show that the proposed change reportedly achieves 0.7% BD-rate savings on average for 3-view coding, and 2.1% BD-rate saving for single dependent view coding, compared to the anchor of MV-HEVC. The co-located MV from the reference view is used as TMVP. Results are reported for 3-view case: 0.7% rate. Comparison made against CTC. There are two changes. One is change of the ref_idx, the second is usage of lowdelay flag for the purpose of TMVP. No action for MV-HEVC. With the current HLS-only approach, it is likely that existing decoder implementations can be used “as is” at the picture level. This would no longer be possible when the proposal would be adopted, whereas the benefit in terms of compression is relatively low (with the current test set, MV-HEVC for the 3-view case has around 42% less bit rate than simulcast). 15.0.1.1.1.1.1.1.283JCT3V-E0226 Modification of Binarization for Depth Intra Mode [X. Chen, X. Zheng, Y. Lin, J. Zheng, (Hisilicon)] D0195 proposes a unified intra mode signalling design for all the new Intra modes added into 3D-HEVC, including Depth Modeling Mode (DMM) modes, the Chain Coding Mode (CCM) and Simplified Depth Coding (SDC) modes. This contribution proposes a modification of binarization for depth intra mode, which is more suitable for signalling 4×4 and 8×8-32×32 depth intra mode. Solution1 achieves 0.04% or 0.05% BD-rate gains and 0.02% or 0.03% video gain compared to 3DV-HTM7.0r1 under CTC without complexity improvement. Solution2 achieves 0.01% BD-rate gains and 0.05% video lost compared to 3DV-HTM7.0r1 under CTC without complexity improvement. Coding efficiency proposal with no gain. No action. 15.0.1.1.1.1.1.1.284JCT3V-E0292 Crosscheck on Modification of Binarization for Depth Intra Mode (JCT3V-E0226) [X. Zhao (Qualcomm)] [late] 15.0.1.1.1.1.1.1.285JCT3V-E0138 AHG 12: Proposal on interlace conformance bitstream for MVC+D [C.-C. Lin, F.-C. Chen (ITRI)] This document proposes disabling up-sampling and post dilation filter for generating a conformance test bitstream related to interlace coding mode for MVC+D extension of AVC. No need for specific presentation, handled in context of conformance AHG; new conformance streams disabling the post filter and interpolation filter will be generated 15.0.1.1.1.1.1.1.286JCT3V-E0303 Editor's proposed draft text of MVC plus depth conformance [T. Suzuki, D. Rusanovskyy] This document is a working draft of new amendment to ITU-T Rec. H.264.1 | ISO/IEC 14496-4 adding conformance test of MVC plus depth extension of AVC. No need for detailed review was identified – input toward updated conformance draft (WG 11 Study of DAM status in ISO/IEC).
15.0.1.1.1.1.1.1.287JCT3V-E0099 JCT-3V AHG 5: Checklist for HTM software integration [G. Tech (HHI)] In this document a checklist for HTM software integration is proposed. The list includes requirements and rules that need to be regarded during software integration process. It is suggested that the list is used by software integrators and cross checkers to check HTM integrations and to report compliance to software coordinators. It is decided that the new checklist is mandatory to be used.
Viewing was performed Monday from 18:00-20:00. Sequences from all three contributions were inspected by approximately 20 experts. Sequence samples of E0119 and E0299 were AVC coded and originally interlaced (fields combined into frames), displayed progressively, where in some cases interlaced artifacts became visible. Some sequences had a significant amount of motion, water. Offline activity was conducted by Shimizu, Dmytro, Sehoon, and Peter to prepare an initial list of material that could be interesting from E0119/E0299 for further inspection/experimentation. See also BoG report JCT3V-E0313 which was reviewed in this context. 15.0.1.1.1.1.1.1.288JCT3V-E0119 3D Test Material from Deutsche Telekom [Peter List (DT)] Deutsche Telekom offers HD stereo material of more than 36 minutes length for the selection of a number of test clips for the use in JCT-3V. Interested parties may examine the sequences and choose any number of useful excerpts that would be delivered to JCT-3V as test clips for non commercial use. 15.0.1.1.1.1.1.1.289JCT3V-E0299 AHG11: New stereo test sequences from Korean Broadcasting System (KBS) [S. Yoo, S. J. Kim] [late] In this contribution, a new set of stereo test sequences was presented and recommended for use in standardization development. 15.0.1.1.1.1.1.1.290JCT3V-E0210 AHG11: NICT-3D test sequences [S. Sugimoto, S. Shimizu (NTT)] This contribution reports the current situation on the use of NICT-3D test sequence presented in JCT3V-C0101. Two CG sequences including depth maps and camera parameters are prepared based on the viewing results of previous meeting. New licence statement allows using these test sequences for the purpose of developing, testing and promulgating the JCT-3V technology standards and for academic usage. It is also asserted that there are some problems on encoding and rendering. Graphics sequences (Shark, MicroWorld) were suggested to have good depth maps and perfect camera parameters. However, due to convergent axes of the virtual cameras some small vertical disparities exist which cause problems in coding and rendering for the case of Micro World. The Shark sequence has problem with inpainting artifacts with the current view synthesis software (which could be a bug). It was agreed to include Shark in the default test set (as mandatory, but for the upcoming meeting cycle not to include it in average computations.) Further investigation necessary about support for non-rectified / non-coplanar camera configurations. Include this in the study of AHG15 (Shimizu as additional chair). 15.0.1.1.1.1.1.1.291JCT3V-E0313 BoG report on viewing of new test sequences [S. Shimizu (NTT), S. Yea (LGE)] This document reports the viewing results of new test sequences offered at the Vienna meeting. The viewing was held on July 29th and approximately 20 people were joined. Since the provided sequences contain several minutes for each, some cuts were pre-selected and recommended for further investigations. The results of the pre-selection are available in attached Excel files. It was recommended to have these cuts with 10-15 seconds long for further investigations. |