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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 two spatial MV predictors used to construct the first STMVP candidate.
  • Pairwise average candidates are disallowed.
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