The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/ sc 29/ wg 11 held its tenth meeting during 11-20 July 2012 at the City Conference Centre (ccc), a k. a
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- 5.8Deblocking filter
|
Video Sequence |
Y |
U |
V |
|
Church_HD |
‒30.4 |
‒30.7 |
‒17.1 |
|
Whale_Show_HD |
‒23.3 |
‒50.1 |
‒47.2 |
|
Marching_in_HD |
‒15.3 |
‒55.0 |
‒50.9 |
|
Overall |
‒23.0 |
‒45.3 |
‒38.4 |
5.8Deblocking filter
5.8.1General
Conclusions on de-blocking:
Subjective tests with 4 sequences Riverbed etc. as suggested in AHG (coordinator: T Suzuki)
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2 rates equivalent to QP 32, 37 -
4 proposals (286, 181prop1, 96, 90) -
A vs. B comparison: Proposal against anchor with max offset, need to compare at same rate points
Several experts expressed the opinion that there is a problem which needs to be resolved. The existence of that problem needs to first be confirmed by the subjective tests, and action to be taken should be discussed afterwards. This could also mean to further study possible solutions.
JCTVC-J0567 BoG Report: Report of subjective test on extended adaptability range of deblocking filter [T. Suzuki] [miss]
Presented verbally in Track B.
Tested: Anchor HM Main with maximum beta and tc offset, 4 proposals, HM with zero offset
22 participants were involved.
HM with maximum offset seems appropriate for these sequences (2 cases Riverbed where it is judged better than zero offset)
1 case Ducks QP37 where J0286 is better than HM with max offset
1 case Riverbed QP37 where J0181 is better than HM with max offset
For all other cases confidence intervals are overlapping (For J0286 the lower boundary of the conf. interval is “touching” the zero line in one case, for J0181 in two cases)
From the results, J0181 and J0286 seem to solve the problem best
Test methodology used appears to unveil reasonable results, more (critical) sequences would be desirable to be included.
J0286 has highest amount of changes (it is also reported that one mismatch was found between the software and the text description), but is the only algorithm which achieves this without changing parameters at the encoder.
Recommendation: Further study (CE) concentrating on J0181 and J0286 and combination, include more critical sequences, but also test with sequences from common test set. (cSuggested coordinators Andrey Norkin, Teruhiko Suzuki.)
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