International organisation for standardisation organisation internationale de normalisation

No.	Title	TBP
Available
12552	Text of ISO/IEC 23002-4/Amd.2 DCOR1	No	12/03/25
12553	Request for Subdivision: ISO/IEC 23002-5 Media Tool Library Reference Software and Conformance	No	12/02/10
12554	Text of ISO/IEC CD 23002-5 Media Tool Library Reference Software and Conformance	No	12/03/20

53D video coding

5.1AVC Core Experiments Category

5.1.13D-AVC-CE1: View synthesis prediction for texture and depth

m23681	Jaejoon Lee	3D-AVC-CE1 summary report on view synthesis prediction
m23629	Yin Zhao, Lu Yu	3D-AVC-CE1 results on simplified VSP for both texture and depth
m23658	Jin Young Lee, Jaejoon Lee, Du Sik Park	3D-AVC-CE1 results on Samsung's inter-view prediction using view synthesis
m23694	Shinya Shimizu	Cross check of 3D-AVC-CE1 on inter-view prediction using view synthesis (m23658)
m23812	Li Zhang, Ying Chen, Yang Yu, Marta Karczewicz	Complexity Reduction for View Synthesis Prediction in 3D-AVC
m23842	J. Jung, E. Mora	Cross check of 3D-AVC-CE1 results of Zhejiang Univ.
m23915	Dong Tian, Danillo Graziosi, Anthony Vetro	3D-AVC-CE1 results on VSP skip /direct mode by Mitsubishi

Summary report:

• 
  3 contributions, 2 cross-checks (additional cross-check from Ericsson expected)
  
• 
  Zhejiang: focus on low complexity, no coding gain
  
• 
  Samsung: skip mode based on synthesized picture
  
• 
  Mitsubishi: adaptive skip based on synthetic or non-synthetic skip
  
• 
  CE report recommends adopting Mitsubishi proposal based on higher coding gain (but cross-check is still needed) and continuing considering view synthesis prediction (VSP) simplifications and further coding efficiency improvement.
  

m23915 (Mitsubishi): proposed addition of a skip_flag in slice data to indicate whether a synthetic or non-synthetic reference picture will be used for skip and direct modes. This showed an average of 1.0-1.5% coding gain with maximum gains in 2-3% range; higher gains were achieved with larger motion sequences. There was reportedly a negligible increase in complexity.

m23629 (Zhejiang): proposed simplification of view synthesis in VSP. The proposal reports 30% savings in decoding time with less than 1% coding loss. Warping precision is limited to integer precision, and other simplifications are made in the forward warping process.

m23812 (Qualcomm): a CE1 related contribution on reducing complexity of warping process in view synthesis. The warping process was proposed to be simplified (removed block boundary detection, splatting, noise cleaning and warp enhancement) and the warping and hole-filling process were combined. The bit rate increase was in the range of 0.2-0.3%, with a decoding time savings of 15-17%. This contribution also reported benefits for decoding with VSP, i.e., 34% savings for generation of VSP reference.

Conclusions:

• 
  Adopt m23915 (adaptive reference skip).
  
• 
  Re-establish CE.
  
• 
  Focus on view synthesis simplifications from Zhejiang and Qualcomm, identifying some common components that may be combined and other aspects to be tested.