| JCTVC-B030 [M. Wien, S. Kamp (RWTH Aachen Univ.)] TE1: RWTH partner report on DMVD
In this contribution, an RWTH tool description and simulation results for the contribution to the Tool Experiment TE1 on Decoder Side Motion Vector Derivation (DMVD) were provided. The technical description of the proposed tools in this document closely relates to the tool description provided as in the response to the Call for Proposals for HEVC.
Simulation results are provided relative to the defined TE1 simulation conditions. The accompanying spreadsheets provide rate-distortion measurements, BD-delta rate and SNR values, and complexity assessment data.
L-shaped region of width 4 samples luma for template search.
Inside the MB the residual is not included in the template representation; outside the MB it is.
Entropy coding is now independent of reconstruction in the design.
Send flag per partition – when set, the decoder infers the motion (no MVD ore ref idx in that case).
(didn't try using median of 3 candidates)
haven't yet tried larger block sizes
CS1 (random access) 4.1% for 32x32 MB size, 7.2% for 16x16 MB size.
CS2 (low delay) 4.2% for 32x32 MB size, 5.8% for 16x16 MB size.
BQTerrace 13% gain in CS2
Less gain when used with motion vector competition technique.
Factor of 2-5 in decoding time increase (may include pessimistic repetitive computations).
Skipping subpel refinement could save much of that, at about a 1% loss in performance.
Is it assumed that the whole picture is encoded in a single slice? Yes.
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