Search Results for "JVET-V0098"
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JVET-V0098 EE2-related: Template-based intra mode derivation using MPMs [Y. Wang, L. Zhang, K. Zhang, Z. Deng, N. Zhang (Bytedance)]
This contribution proposes a template-based intra mode derivation (TIMD) method using most probable modes (MPMs). For each intra prediction mode in MPMs, the sum of absolute transformed differences (SATD) between the prediction and reconstruction samples of a template is calculated. The intra prediction mode with the minimum SATD is selected as the TIMD mode and used for intra prediction of current block. On top of the EE2 code of JVET-U0100, simulation results of the proposed method are reported as below:
Tool-on test (Anchor: VTM-11.0): AI: {-0.41%, 117%, 111%}; RA: {-0.23%, 109%, 107%}.
Tool-off test (Anchor: EE2 code): AI: {-0.27%, 118%, 109%}; RA: {-0.11%, 104%, 101%}.
Question: Was the MPM list derivation changed? Yes, but it is not using TM to construct the MPM list.
This is different from the current DIMD mode, and if tested in EE, it could also be tested in combination with ISP. There is no conflict with the aspect 1 from JVET-V0087.
It was clarified that the shape of the template depends on the CU size.
It was agreed to investigate this in in an EE.
JVET-V2024 Exploration Experiment on Enhanced Compression beyond VVC capability (EE2) [ V. Seregin, J. Chen, S. Esenlik, F. Le Léannec, L. Li, J. Ström, M. Winken, X. Xiu, K. Zhang] [WG 5 N 58] (2021-05-21)
An initial draft was reviewed and approved. Agreed to shorten sequences for LB and LP to 5 seconds (all classes). It was suggested to call the software ECM (enhanced compression model). V. Seregin and K. Zhang to coordinate the software.
Future meeting plans, expressions of thanks, and closing of the meeting
Future meeting plans were established according to the following guidelines:
- Meeting under ITU-T SG 16 auspices when it meets (ordinarily starting meetings on the Wednesday of the first week and closing it on the Wednesday of the second week of the SG 16 meeting – a total of 8 meeting days), and
- Otherwise meeting under ISO/IEC JTC 1/SC 29 auspices when its MPEG WGs meet (ordinarily starting meetings on the Friday prior to the main week of such meetings and closing it on the same day as other MPEG WGs – a total of 8 meeting days).
In cases where an exceptionally high workload is expected for a meeting, an earlier starting date may be defined. In case of online meetings, no sessions should be held on weekend days. This may imply an earlier starting date as well.
Some specific future meeting plans (to be confirmed) were established as follows:
JVET-V0087 EE2-Related: Improvements of Decoder-Side Intra Mode Derivation [J. Zhao, S. Paluri, S. Kim (LGE)]
This contribution presents methods to improve Decoder-side Intra Mode Derivation (DIMD) on top of EE2 common software/JVET-U0100.
Aspect 1), Combination of DIMD and ISP is not allowed.
Aspect 2), DIMD with multiple blend modes is proposed. Instead of one DIMD blend mode in JVET-U0100, in the proposed method, 3 blend modes are used. These 3 blend modes have different weights when blending the predictions from decoder derived intra modes and planar mode. An index is signalled to indicate which DIMD blend mode is to be used.
Experiments are performed using EE2 Tool-on test Base setting. Comparing to EE2 Base with only DIMD on, aspect 1 gives gain of -0.07%, -0.13%, -0.06% in AI configuration, and -0.04%, -0.09%, -0.04% in RA configuration for Y,U,V components respectively. There is no change of encoding and decoding time. Aspect 1 and 2 together gives gain of -0.23%, -0.17%, -0.16% in AI configuration, with 115% encoding time; and gives gain of -0.12%, -0.09%, -0.03% in RA configuration with 103% encoding time. There is no decoding time increase.
Gain on top of VTM is 0.67% for AI and 0.38% for RA (larger gain than on top of EE2 software)
The gain of aspect 1 comes from avoiding signalling a syntax element.
Aspect 2 introduces some new mode differentiation in addition.
It was mentioned that JVET-V0098 also investigates another modification of DIMD (including information from MPM list) which is claimed that it might work better also in the combination with ISP.
Investig...