International organisation for standardisation organisation internationale de normalisation

5.2.53D-HEVC-CE5: In-Loop Filtering for Depth

m23685	Kwan-Jung Oh	3D-HEVC-CE5 summary report on in-loop filtering for depth
m23534	Fabian Jäger	3D-HEVC-CE5 Results on Trilateral Loop Filtering for Depth Coding
m23592	Nikolce Stefanoski	Cross check of ETRI's 3D-HEVC-CE5 results by DRZ
m23622	W. Lim, S. Yoo, J. Nam, D. Sim, G. Bang	3D-HEVC-CE5 - Region-based anisotropic filter for depth map
m23654	Fabian Jäger	3D-HEVC-CE5 Cross Check of Samsung's Region-based Adaptive Loop Filter
m23665	Ilsoon Lim, Jaejoon Lee, Du Sik Park	3D-HEVC-CE5 results on Samsung's region-based adaptive loop filter
m23677	Ilsoon Lim, Jaejoon Lee, Du Sik Park	Cross Check of 3D-HEVC-CE5 Aachen’s anisotropic median filter by Samsung

Summary report (3 proposals submitted):

• 
  RWTH: Trilateral Loop Filtering for Depth Coding
  
• 
  ETRI: Region-based anisotropic filter for depth map
  
• 
  Samsung: Region-based adaptive loop filter
  

Samsung proposed an adaptive bilateral filter with increased decoder complexity and 0.76% and 0.96% bit rate gains for 3-view and 2-view case. There were concerns about the high decoder complexity estimated at 250%.

ETRI proposed anisotropic filtering, with 0.34% and 0.20% benefits for 3-view and 2-view cases, without significant complexity impact.

RWTH proposed trilateral loop filtering, with slight losses in BD rates, and a huge decoder complexity increase.

Concern was expressed that the in-loop filtering in HEVC is still subject to changes.

Conclusions:

• 
  Discontinue CE.
  
• 
  Encourage further study on techniques yielding higher gains without significant complexity increases.