5.10Motion compensation interpolation filtering
JCTVC-B043 [A. Tanizawa, T. Chujoh, T. Yamakage (Toshiba)] Synergistic effect of high accuracy interpolation filter (HAIF) and quad-tree based adaptive loop filter (QALF)
Many kinds of interpolation filtering technique were proposed at the 1st JCT-VC meeting in Dresden in response to the Call for Proposals. The contribution JCTVC-A117 proposed the combination of High Accuracy Interpolation Filter (HAIF) and Quad-tree based Adaptive Loop Filter (QALF) to achieve additional coding gain compared to the stand-alone usage of each tool.
This contribution shows simulation results of HAIF, QALF, and the combination of HAIF and QALF. If only HAIF is introduced on top of AVC, there are a few sequences that show significant coding gain, while some sequences show loss. However, if HAIF is introduced in conjunction with QALF, additional gain on QALF was reportedly always observed. For the IPPP coding structure, a "synergistic" effect of HAIF and QALF was reported. In the experimental results, for the IPPP coding structure, the combination of HAIF and QALF reportedly achieved a gain of 2.3% beyond the sum of the gains aof HAIF only and QALF only.
The test results were reported from the KTA software context.
It was suggested that evaluations of motion compensation interpolation filtering should be performed with adaptive loop filtering enabled, and vice-versa.
Main suggestion made by the proponents is that in the context of investigating interpolation filters the loop filter should be switched on.
In general, the interdependency of loop filter and interpolation filter seems not to be fully understood.
Dostları ilə paylaş: |
