Organisation internationale de normalisation

CE10 cross checks (2)

13.0.0.1.1.1.1.1.172JCTVC-S0092 CE10: Cross-check of Hybrid 1-D/2-D Intra string search for HEVC screen content coding (JCTVC-S0161) [B. Li, J. Xu (Microsoft)] [late]
13.0.0.1.1.1.1.1.173JCTVC-S0245 CE10: Cross-check of S0083 (Result of Test 1 and 2) [W. Wang, M. Xu, Z. Ma, H. Yu (Huawei USA R&D)] [late]
13.0.0.1.1.1.1.1.174JCTVC-S0281 CE10: Crosscheck of JCTVC-S0192 Test 2 [F. Zou (Qualcomm)] [late]

5. Non-CE Technical Contributions (141)

   1. SCC (127)

      1. CE1 related (vector entropy coding) (2)

(Consideration of this topic was chaired by JRO on Sunday 10-19 p.m.)

13.0.0.1.1.1.1.1.175JCTVC-S0143 Non-CE1: Block vector coding for Intra block copy mode [K. Rapaka, M. Karczewicz, C. Pang (Qualcomm), K. Miyazawa, A. Minezawa, S. Sekiguchi (Mitsubishi)]

This contribution proposes a method to code intra block vector for intra block copy (IBC) mode. The proposed method combines aspects from CE1 Test 4.1 and JCTVC-R0182. The CE1 Test 4.1 combines binarization method from CE1 Test 1.1 with aspects in Test 1.3. It is argued that in some scenarios there exists redundancy on the IBC block vectors and removing these redundancies provides coding efficiency improvements. It is asserted that the proposed method effectively removes redundancies in block vector by inferring sign and absolute values of block vector components. It is reported that the proposed approach provides objective bit rate reductions of −1.0 %, −1.2% for All Intra 1080p text and graphics RGB and YUV categories, respectively over SCM-2.0 anchor.

By the time of the presentation of the contribution, a decision about the methods from CE1 has not been taken yet (BoG work not finished). The additional aspect of redundancy reduction is asserted to be interesting and should be further considered (CE).

One expert points out that the syntax should not become too complicated.

13.0.0.1.1.1.1.1.176JCTVC-S0225 Cross-check of ‘Non-CE1: Block vector coding for Intra block copy’ (JCTVC-S0143) by Mitsubishi and Qualcomm [C. Rosewarne, M. Maeda (Canon)] [late]

2.