International organisation for standardisation organisation internationale de normalisation

Lossless compression (beyond version 1)

Reviewed in RExt BoG.

4.2.0.1.1.1.1.1.294JCTVC-L0114 AHG7: Coefficient coding for lossless coding [Y. Piao, J. Min, S. Lee (Samsung)]

4.2.0.1.1.1.1.1.295JCTVC-L0426 Cross-check of Samsung's proposal on coefficient coding for lossless coding (L0114) [X. Zheng, Y. Lin (Hisilicon)] [late]
4.2.0.1.1.1.1.1.296JCTVC-L0117 AHG7: Residual DPCM for HEVC lossless coding [S. Lee, I.-K. Kim, C. Kim (Samsung)]
4.2.0.1.1.1.1.1.297JCTVC-L0427 Cross-check of Samsung's proposal on residual DPCM for HEVC lossless coding (L0117) [X. Zheng, Y. Lin (Hisilicon)]
4.2.0.1.1.1.1.1.298JCTVC-L0118 AHG7: Residual quadtree for HEVC lossless coding [T. Lee, S. Lee (Samsung)]
4.2.0.1.1.1.1.1.299JCTVC-L0161 Intra prediction for lossless coding [Peter Amon, Andreas Hutter (Siemens), Andreas Weinlich, André Kaup (Univ. Erlangen)]
4.2.0.1.1.1.1.1.300JCTVC-L0176 AHG7: Sample-based angular intra prediction for HEVC range extension [M. Zhou (TI)]
4.2.0.1.1.1.1.1.301JCTVC-L0275 AHG7: Cross-verification report on JCTVC-L0176 entitled "Sample-based angular intra prediction for HEVC range extension" [K.Tokumitsu, K.Chono (NEC)] [late]
4.2.0.1.1.1.1.1.302JCTVC-L0302 AHG8: Lossless coding test results for the 4:4:4 screen content sequences [H. Yu (Huawei), W. Gao, J. Ye, Y. Cao, X. Wang]
4.2.0.1.1.1.1.1.303JCTVC-L0428 AHG8: Impact of transform skip on new screen content material [R. Cohen, A. Vetro (MERL)] [late]
4.2.0.1.1.1.1.1.304JCTVC-L0303 AHG8: P2M based dual-coder extension of HEVC [Tao Lin, Shuhui Wang, Peijun Zhang, Kailun Zhou (Tongji Univ.)]
4.2.0.1.1.1.1.1.305JCTVC-L0313 AHG8: P2M and P2M+SAP as lossless coding tools for screen content coding [Peijun Zhang, Tao Lin, Shuhui Wang, Kailun Zhou (Tongji Univ.)]
4.2.0.1.1.1.1.1.306JCTVC-L0362 Cross-verification of JCTVC-L0313 [M. Zhou (TI)] [late]

9. Interlaced scan and field-based video coding

4.2.0.1.1.1.1.1.307JCTVC-L0187 HEVC Software modifications for field based coding [Zineb Agyo, Jean-Marc Thiesse, Jérôme Viéron]

This contribution describes non-normative changes made to the HEVC reference software (HM 9.1) in order to facilitate the handling of interlaced content in case of field coding.

These changes include field separation at the encoder input so that each field can be compressed separately. This way, the interlaced source can be fed to the encoder directly without any preliminary external processing. At the encoder output side, re-interlacing is performed and frame based PSNR computation is also added in order to facilitate performance evaluation.

The contribution also presents a new GOP structure that is asserted to be more suitable for interlaced content; hence additional modifications have been made in the software so it can support this kind of structure.

These changes were suggested to be helpful for assessment of HEVC interlace coding.

A 15% gain over the current HM capability and 9% was estimated from using the modified coding scheme for four particular test sequences.

The impact on the software was asserted to be manageable. Decision (SW): Adopt into HM (software coordinator is delegated the discretion to check the manageability of the code and to prioritize its integration).

4.2.0.1.1.1.1.1.308JCTVC-L0442 Crosscheck of JCTVC-L0187 on HEVC Software modifications for field based coding [Gordon Clare, Félix Henry] [late]

4.2.0.1.1.1.1.1.309JCTVC-L0378 Performance evaluation of HEVC on YUV4:2:2 interlace video sources [A. Minezawa, K. Sugimoto, S. Sekiguchi (Mitsubishi)] [late]

Reviewed in RExt BoG.

10. Non-normative: Encoder optimization, decoder speed improvement, post filtering, loss concealment, rate control

    1. Rate control

4.2.0.1.1.1.1.1.310JCTVC-L0033 Bug fix for rate control algorithm in HM [B. Li, L. Li, H. Li (USTC)]

This contribution presents several bug fixes and improvements of the R-lambda model based rate control algorithm in HM. With the bug fixes, both the R-D performance and bitrate accuracy are reportedly improved.

Trying a minimum of 1 bit rather than 0 bit allocation was suggested. The proponent was asked to test and determine the appropriate value.

The software change is reported to be only about 10 lines of code.

Decision (SW): Adopted (not high priority).

For future minor fixes like this, it was suggested that filing a bug report might be an efficient way to make such changes.

4.2.0.1.1.1.1.1.311JCTVC-L0392 Cross-check of JCTVC-L0033 [J. Xu (Microsoft)] [late]

2. Encoder optimization

4.2.0.1.1.1.1.1.312JCTVC-L0034 Cleanup for motion estimation process in HM [B. Li, H. Li (USTC)]

The combined list was removed because of the adoption of JCTVC-I0125. But there are still some lines of code related to the combined list in HM-9.0. This contribution proposes to remove the code related to the former "combined list" scheme from the HM software. The experimental results reportedly show that there is no impact on the low delay cases and the impact on random access cases is about 0.04% and −0.02% on average, in terms of Y BD-Rate for RA-Main and RA-HE10 respectively.

A net reduction of about 150 lines of code was reported.

It was noted that L0167 includes a bug report that may be related. However, it was commented during the discussion that this bug fix only affects a very unusual corner case that is not typically tested. The contributor of L0034 indicated that the bug would be removed by the cleanup, since the affected lines of code were removed.

The gratitude of the group was expressed for the cleanup effort.

Decision (SW): Adopted (not high priority), subject to discretion of code quality check by the software coordinator.

For future minor fixes like this, it was suggested that filing a bug report might be an efficient way to make such changes.

4.2.0.1.1.1.1.1.313JCTVC-L0305 Crosscheck for cleanup of ME process in HM (JCTVC-L0034) [W. Zhang, L. Xu, Y. Han, Z. Deng, X. Cai, Y. Chiu (Intel)] [late]

11.