International organisation for standardisation organisation internationale de normalisation
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5.17.3Intra mode coding5.17.3.1.1.1.1.1.1JCTVC-H0079 Non-CE6.c: Unified neighbouring positions for intra mode coding [S. Fukushima, H. Nakamura (JVC Kenwood)] Discussed in BoG – concern was expressed that the current PU size must be known to determine the position, and the benefit is not really clear. No action was taken on this. 5.17.3.1.1.1.1.1.2JCTVC-H0081 Non-CE6.c: Fixed length binarization of remaining intra prediction mode [T. Kumakura, S. Fukushima, M. Ueda (JVC Kenwood)] Discussed in BoG. 5.17.3.1.1.1.1.1.3JCTVC-H0085 Non-CE6.c: Cross-verification of unified neighbouring positions for intra mode coding (JCTVC-H0079 from JVC) [M. Zhou(TI)] 5.17.3.1.1.1.1.1.4JCTVC-H0098 Non-CE6: Modified definitions of intra mode and most probable mode [T. Yamamoto (Sharp)] Discussed in BoG. 5.17.3.1.1.1.1.1.5JCTVC-H0166 Non CE6: Unification of the number of intra prediction modes [H. L. Tan, C. Yeo, Y. H. Tan, Z. Li (I2R)] Discussed in BoG. 5.17.3.1.1.1.1.1.6JCTVC-H0322 Cross-check of I2R proposal on intra luma mode coding (JCTVC-H0166) [H. Yang (Huawei)]
Discussed in BoG. 5.17.3.1.1.1.1.1.8JCTVC-H0364 Non CE6: Cross-check of 35 intra prediction modes for intra 4x4 PU (JCTVC-H0342) [J. Xu (Microsoft)]
Discussed in BoG. 5.17.3.1.1.1.1.1.10JCTVC-H0717 Non-CE6: Cross-check report for Canon's proposal on intra mode coding (H0175) [X. Zheng, J. Zhou, H. Yu (Huawei)] [late 02-04]
Discussed in BoG. 5.17.3.1.1.1.1.1.14JCTVC-H0195 Non-CE6: Cross-check report for H0326 Huawei on Chroma Intra coding [H. L. Tan, C. Yeo, Y. H. Tan (I2R)] [late]
Discussed in BoG. 5.17.3.1.1.1.1.1.16JCTVC-H0632 Non-CE6: Cross-check of Postpone MPM sorting by Qualcomm (H0428); [C. Rosewarne, M. Maeda (Canon)] [late]
Discussed in BoG. 5.17.3.1.1.1.1.1.18JCTVC-H0493 Cross-verification of JCTVC-H0435: Intra mode coding with fixed length binarization [E. S. Ryu, Y. Ye (InterDigital)] [late]
Discussed in BoG. 5.17.3.1.1.1.1.1.20JCTVC-H0631 Non-CE6: Cross-check of Modifications of intra mode coding by Qualcomm (H0534) [C. Rosewarne, M. Maeda (Canon)] [late]
Discussed in BoG. 5.17.3.1.1.1.1.1.22JCTVC-H0596 Non-CE6: Cross-verification of Qualcomm intra mode coding simplification (JCTVC-H0563) [S. Fukushima, T. Kumakura (JVC Kenwood)] [late]
In this contribution, DC mode was proposed as a default intra mode. For this purpose, complexity and hit numbers between DC and planar mode were analysed. In HM5.0, the default intra mode is assumed as planar mode in the intra mode coding process. Previously, in HM4.0, DC mode was the default intra mode. According to tests, the ratio between the number of operations for (DC prediction + DC prediction filtering) and that of planar prediction is approximately 13.3. The hit rate of planar mode becomes higher when the default intra mode is set as planar mode rather than DC mode. In a similar fashion, the hit number of the DC mode becomes higher when the default intra mode is set as the DC mode rather than the planar mode. Combined with both results, it could be concluded that the complexity of a default DC mode case is lower (on average) than that of default planar mode case since DC mode has a higher number of hits with lower complexity than the planar mode would have. Average coding efficiency changes from this modification for each configuration were reportedly 0.0% (AI-HE), 0.0% (AI-LC), 0.0% (RA-HE), 0.0% (RA-LC), 0.0% (LD-HE), 0.0% (LD-LC) and 0.1% (RA-HE-10bit). Coding efficiency impact for Class F was -0.1%. Encoding and decoding times were reported as 100% and 99%, respectively. It was noted that a default DC mode is more efficient than a default planar mode, especially for class F since DC prediction is better than planar prediction to represent uniform regions for computer-generated video, such as screen content. Based on these results, it was proposed to use DC mode as the default intra mode in HM6.0. Decision: Adopted. 5.17.3.1.1.1.1.1.25JCTVC-H0613 Non-CE6: Cross-verification of Samsung DC mode as a default mode (JCTVC-H0242) [S. Fukushima, H. Nakamura (JVC Kenwood)] [late] 5.17.3.1.1.1.1.1.26JCTVC-H0405 Bypass coding in chroma Intra modes [E. Maani, A. Tabatabai (Sony)] Discussed in BoG. 5.17.3.1.1.1.1.1.27JCTVC-H0598 Cross-verification of Sony Bypass coding in chroma intra modes (JCTVC-H0405) [K. Chono, H. Aoki (NEC)] [late]
Discussed in BoG. 5.17.3.1.1.1.1.1.29JCTVC-H0107 Non-CE6: Crosscheck of intra mode coding (JCTVC-H0407) [T. Yamamoto (Sharp)] [late]
Discussed in BoG. 5.17.3.1.1.1.1.1.31JCTVC-H0665 Cross-check of Motorola Mobility proposal on intra mode coding (H0516) [C. Yeo, Y. H. Tan (I2R)] [late]
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