Alternative depth formats (1)
14.1.1.1.1.1.1.1.165JCT3V-G0107 Technically improved texture and depth view packing SEI message in 3D-AVC [Takanori Senoh, Koki Wakunami, Yasuyuki Ichihashi, Hisayuki Sasaki, Kenji Yamamoto, Masayuki Tanimoto (NICT/NISRI), Ying Chen (Qualcomm)]
This document provides technically improved texture and depth view packing SEI message in 3D-AVC. The document is improved based on the editor’s comments at the 6th JCT-3V meeting.
The new version of the SEI message has new syntax elements for homography mapping data, expressed via camera parameters. The syntax of the camera parameters is similar to the existing camera parameter SEI message (different in the length of the exponent of the float representation).
Discussion whether the homography mapping could be expressed more compactly. However, the camera parameters are further needed to determine the pixel shifts from the depth values in the synthesis process.
It is suggested that the camera parameters should be identical in syntax and semantics to the existing SEI message
Position of the residual views in the frame packing should be changed to:
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R1 at 0,0
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R2 at W/2, 0
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R3 at 0, H/2
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R4 at W/2, H/2
If there is only one residual view, it will be at R1, if there are two, they are at R1 and R2 etc.
It does not matter where the physical views are, and how they are associated with the residual views, as the camera parameters are describing that.
Remove Figures J1 and J2, and do not associate the base view with #3.
The changed document was uploaded. The parent bodies gave advice to defer further consideration for the next meeting, also identifying relation with MPEG’s FTV exploration.
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