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13th Meeting: Marrakech, January 2019 2019-01-09 13:17
CE4: STMVP without scaling (tests 4.2.2)
Authors: Fabrice Le Léannec Technicolor Tangi Poirier Technicolor Franck Galpin Technicolor
Abstract
This contribution reports the results of the non-scaling STMVP motion vector prediction method, initially proposed in JVET-L207.
Meeting Notes
JVET-M0106 CE4: STMVP without scaling (tests 4.2.2) [F. Le Léannec, T. Poirier, F. Galpin (Technicolor)]

Test 4.2.2.a

The proposed STMVP technique is based on JVT-L0207. It consists in constructing the STMVP merge candidate as follows.

  • One top-neighbouring motion vector (MV) of current CU is selected among spatial position (w/2,-1), (2*w,-1) and (w-1,-1). The first found position where all available MVs use the reference picture index 0 is selected.
  • One left-neighbouring motion vector (MV) of current CU is selected among spatial position (-1,h/2), (-1,2*h) and (-1,h-1). The first found position where all available MVs use the reference picture index 0 is selected.
  • The same temporal MV predictor as in JVET-L0207 is used. The temporal candidate is set as always available, given that the Right-Bottom position of the current block is inside the picture. The y-position of the temporal candidate is clipped to ensure it lies inside the current CTU row.
  • The STMVP candidate is considered as available if at least 2 spatial-temporal MV predictors are found. If only one neighbouring MV is retrieved, no STVMP candidate is included into the merge list.
  • No MV scaling is applied.
  • The STMVP candidate is computed as the average between the 2 or 3 retrieved spatial and temporal MV predictors.

Test 4.2.2.c

Test 4.2.2.c involves 2 additional aspects over test 4.2.2.a.

  • A second STMVP candidate is added to the merge candidate list, if 3 motion vectors (thus including the temporal predictor) had been used to generate the first STMVP candidate. The additional STMVP candidate consists in the average of...
References:
JVET-L0207 JVET-L207 JVT-L0207
Cited:
JVET-M0024 JVET-M0713
PATENTS:
JP2023011591A 0.71 2023-01-24 US12489892B2 0.71 2025-12-02 CN113170139A 0.71 2021-07-23 TWI725445B 0.70 2021-04-21 EP4325859A2 0.70 2024-02-21 US12206850B2 0.30 2025-01-21 US12167018B2 0.27 2024-12-10 US11962799B2 0.25 2024-04-16
ARCHIVE v4 :
CE4.2.2.a_ls6_0.1_tester.xlsm CE4.2.2.a_ls6_tester.xlsm CE4.2.2.a_ls8_0.1_tester.xlsm CE4.2.2.b_ls6_tester.xlsm CE4.2.2.b_ls6_tester_0.1.xlsm CE4.2.2.b_ls8_tester_0.1.xlsm JVET-M0106 - r2.docx JVET-M0106-text-r1.docx
Decisions
Pairwise average candidates are disallowed.
Citation
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