Search Results for "JVET-O0549"
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Abstract
This contribution proposes an encoder-only temporal filter. The filtering is done at the encoder side as a pre-processing step. Source pictures before and after the original picture to encode are read and an 8x8 block-based motion compensation method relative to the original picture is applied on those source pictures. Samples in the original picture are temporally filtered using source picture sample values after motion compensation. Only pictures at temporal sub layers 0 and 1 are filtered.
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JVET-O0549 AHG10: Encoder-only GOP-based temporal filter [P. Wennersten, R. Sjöberg, J. Enhorn (Ericsson)]
This contribution was discussed along with those in section 6.15 on Friday 5 July 1800–2130 in Track B (chaired by JRO).
This contribution proposes an encoder-only temporal filter. The filtering is done at the encoder side as a pre-processing step. Source pictures before and after the original picture to encode are read and an 8x8 block-based motion compensation method relative to the original picture is applied on those source pictures. Samples in the original picture are temporally filtered using source picture sample values after motion compensation. Only pictures at temporal sub layers 0 and 1 are filtered.
A similar method was proposed as JCTVC-AI0023 and adopted to HM at the previous JCT-VC meeting.
The method was reportedly tested under VTM-5.0 RA, LDB and LDP common test configurations. The average Y/U/V BD-rates for the common test conditions (CTC) are reported to be −3.49%/−6.96%/−6.53% (RA), −1.00%/−1.24%/−2.24% (LDB) and −1.47%/−1.95%/−2.78% (LDP). All BDR numbers were computed using unfiltered source sequences. The method is not proposed for AI encoding.
Version 2 of this document contains updated BDR numbers for RA.
It is proposed to adopt the proposed method into the VTM software but to disable it in the CTC.
Filtering strength is QP adaptive.
The proposal received support by several experts expressing interest.
This should not be in CTC (as preprocessing is usually undesirable for comparison), but interesting for experimentation. Could also be used for...
Decisions
adopted
Decision (SW): Adopt JVET-O0549 (not in the CTC).
Citation
Abstract
The encoder-only GOP-based temporal filter proposed in JVET-O0549 was adopted in the previous meeting in Gothenburg. This contribution provides performance numbers by enabling the filter on top of VTM-6.1. The average Y/U/V BD-rates for the common test conditions (CTC) for the filter on top of VTM-6.1 are reported to be −3.91%/−6.63%/−6.56% (RA), −0.96%/−1.30%/−2.18% (LDB) and −1.48%/−1.61%/−2.23% (LDP). This can be compared to the numbers compared in JVET-O0549-v2: −3.49%/−6.96%/−6.53% (RA), −1.00%/−1.24%/−2.24% (LDB) and −1.47%/−1.95%/−2.78% (LDP).
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JVET-P0328 AHG10: Performance of the GOP-based temporal filter in VTM-6.1 [J. Enhorn, R. Sjöberg, J. Ström, P. Wennersten (Ericsson)]
References:
Cited:
PATENTS:
WO/2022/146215
0.34
20240314307
0.33
119240246
0.32
WO/2022/206928
0.31
20240214565
0.30
WO/2016/209132
0.28
202117033699
0.27
20240357100
0.26
Decisions
JVET-P0328 AHG10: Performance of the GOP-based temporal filter in VTM-6.1 [J. Enhorn, R. Sjöberg, J. Ström, P. Wennersten (Ericsson)]
Citation
Abstract
This document summarizes the activities of AHG10: Encoding algorithm optimization, between the 23rd meeting (teleconference, 7-16 July 2021) and the 24th meeting (teleconference, 6-15 October 2021).
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JVET-X0010 JVET AHG report: Encoding algorithm optimization (AHG10) [P. de Lagrange, R. Sjöberg, A. Tourapis]
This document summarizes the activities of AHG10: Encoding algorithm optimization, between the 23rd meeting (teleconference, 7-16 July 2021) and the 24th meeting (teleconference, 6-15 October 2021).
Mandates
At the 23rd meeting of the ITU-T/ISO/IEC Joint Video Experts Team (JVET), an ad hoc group on Encoding algorithm optimization was established with the following mandates:
- Study the impact of using techniques such as tool adaptation and configuration, and perceptually optimized adaptive quantization for encoder optimization.
- Study the impact of non-normative techniques of pre processing for the benefit of encoder optimization.
- Study encoding techniques of optimization for objective quality metrics and their relationship to subjective quality.
- Study optimized encoding for reference picture resampling and scalability modes in VTM.
- Consider neural network-based encoding optimization technologies for video coding standards.
- Investigate other methods of improving objective and/or subjective quality, including adaptive coding structures and multi-pass encoding.
- Study methods of rate control and rate-distortion optimization and their impact on performance, subjective and objective quality.
- Study the potential of defining software configuration settings optimized for subjective quality, and coordinate such efforts with AHG3.
The regular JVET e-mail reflector was used for discussions (jvet@lists.rwth-aachen.de). No e-mail related to AHG10 activity was sent to the JVET reflector...
Decisions
The AHG recommended that the related input contributions be reviewed and to further continue the study of encoding algorithm optimizations in JVET.
Citation
Abstract
The document summarizes the activities of the AHG on Encoding algorithm optimizations between the 15th meeting in Gothenburg, SE (3-12, July 2019) and the 16th meeting in Geneva, CH (1-11, October 2019).
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JVET-P0010 JVET AHG report: Encoding algorithm optimization (AHG10) A. Duenas, A. Tourapis, S. Ikonin, A. Norkin, R. Sjöberg, J. Le Tanou, J.-M. Thiesse]
This AHG report was discussed Thursday 3 October (chaired by JRO).
No e-mail related to AHG10 activity was sent to the JVET reflector during the AHG period.
The following input documents were identified to be related to the AHG:
JVET-P0328: AHG10: Performance of the GOP-based temporal filter in VTM-6.1
The encoder-only GOP-based temporal filter proposed in JVET-O0549 was adopted in the previous meeting in Gothenburg. This contribution provides performance numbers by enabling the filter on top of VTM-6.1. The average Y/U/V BD-rates for the common test conditions (CTC) for the filter on top of VTM-6.1 are reported to be −3.91%/−6.63%/−6.56% (RA), −0.96%/−1.30%/−2.18% (LDB) and −1.48%/−1.61%/−2.23% (LDP). This can be compared to the number...
References:
Decisions
It was suggested to perform subjective viewing on some of the contributions (if possible).
Citation
Abstract
This document defines Core Experiment 8 (CE8) on 4:4:4 screen content coding tools, to be performed for the upcoming Oct 2019 JVET meeting.
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JVET-O2028 Description of Core Experiment 8 (CE8): 4:4:4 Screen Content Coding Tools [X. Xu, Y.-H. Chao, Y.-C. Sun, J. Xu]
It was noted that a CTC for 4:4:4 content has not been decided yet.
In the context of CE8, it was agreed that palette mode should be turned on in the anchors.
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 Tuesday of the first week and closing it on the Wednesday of the second week of the SG 16 meeting – a total of 9 meeting days), and
Otherwise meeting under ISO/IEC JTC 1/SC 29/WG 11 auspices when it meets (ordinarily starting meetings on the Wednesday prior to such meetings and closing it at lunchtime on the last day of the WG 11 meeting – a total of 9.5 meeting days).
In cases wh...
Decisions
Yun Zhou (ABS)
Citation
Abstract not available in document
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JVET-O1133 BoG report on PROF/BDOF harmonization contributions (CE4 & CE9 related) [S. Esenlik, H. Yang]
The BoG met in two sessions in order to discuss CE9 (decoder motion vector derivation) related contributions. The sessions were held on 7 July 2019 from 11:30 to 13:45 and from 15:00 to 17:00.
Presented in track B Tuesday 1130-1330
Recommended for adoption:
JVET-O1133 BoG report on PROF/BDOF harmonization contributions (CE4 & CE9 related) [S. Esenlik, H. Yang]
See section 6.9.
List of actions taken affecting the draft text of VVC, the VTM, and 360Lib
The following is a summary, in the form of a brief list, of the actions taken at the meeting that affect the text of the VVC draft text, VTM or 360Lib description. Both technical and editorial issues are included. This list is provided only as a summary – details of specific actions are noted elsewhere in this report and the list provide...
Decisions
adopted
Recommended for adoption:
It was reminded that in cases where the JVET document is also made available as MPEG output document, a separate version under the MPEG document header should be generated. This version should be sent to GJS and JRO for upload.
Citation
Abstract
In affine merge mode, for inherited candidates, BCW index is inherited from spatial neighbor block which is coded with affine mode while for constructed candidates, BCW index is derived from indices of the each CPs. In this proposal, the number of comparisons on BCW index derivation process for affine constructed merge mode, which was adopted in the previous meeting is reduced as follows.
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JVET-O0366 Non-CE4: Simplifications on BCW index derivation process [N. Park, J. Nam, H. Jang, J. Lim, S. Kim (LGE)]
JVET-O0366 (method 2): simplify BCW index derivation by setting it to the BCW index of the first candidate spatial neighbour block in the process of constructing an affine merge candidate.
JVET-O0681 (method 2) Disabled DMVR, BDOF and BCW for CIIP + inherit BCW index
Decision: The range of MVD shall be extended to [−217, 217−1] (no specific document was identified regarding this)
CE5: Loop filtering
Deblocking: Extensive subjective testing
CE5-2 Align deblocking with 4x4 grid
No need in case of chroma
Luma shows visual improvement, complexity evaluation of 2 different methods ongoing (one of them seems slightly better than the other concerning the number of cases of improvement over anchor)
CE5-3 MV difference threshold reduced to ½ pel
Visual benefit proven, adopt 0061
C...
Decisions
JVET-O0366 Non-CE4: Simplifications on BCW index derivation process [N. Park, J. Nam, H. Jang, J. Lim, S. Kim (LGE)]
It was agreed that picture dimensions are to be required to be a multiple of 8 – OK
Citation
Abstract
The document summarizes the activities of the AHG on Encoding algorithm optimizations between the 14th meeting in Geneva, CH (19-27, March 2019) and the 15th meeting in Gothenburg, SE (3-12, July 2019).
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JVET-O0010 JVET AHG report: Encoding algorithm optimizations (AHG10) [A. Duenas, A. M. Tourapis, C. Helmrich, S. Ikonin, A. Norkin, R. Sjöberg]
The document summarizes the activities of the AHG on Encoding algorithm optimizations between the 14th meeting in Geneva, CH (19-27, March 2019) and the 15th meeting in Gothenburg, SE (3-12, July 2019).
Relevant input contribution documents (5 in total) were listed and summarized in the AHG report.
JVET-O0256: Non-CE: Fast encoder with adjusted threshold in dependent quantization
JVET-O0432: AHG10: LMCS encoder improvement
JVET-O0549: AHG10: Encoder-only GOP-based temporal filter
JVET-O0635: AHG10 related: Optimized CTU level bit allocation in inter frames
JVET-O0888: AHG10: Adaptive Coding Sub-set for encoder optimization
It was remarked that there appear to be normative aspects in JVET-O088.
The AHG recommends that the related input contributio...
Decisions
The AHG recommends that the related input contributions are reviewed and to further continue the study of encoding algorithm optimizations in JVET.
Citation