International organisation for standardisation organisation internationale de normalisation
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4Explorations – 3D VideoA goal of the 3D video exploration activity is to enable the generation of interpolated views from available source views of multiview camera configurations. The target application is mostly seen as being for upcoming generations of various (auto-) stereoscopic displays, either requiring multiple views internally or providing means for baseline adjustment. In the new envisioned scheme, only a low number (1-3) of video sequences would be transmitted, and the rendering of additional views would be enabled by associated depth information. In the exploration experiments preceding the London meeting, further progress was made on improving (automatic) depth estimation and view rendering / interpolation. Two approaches were investigated, namely layered depth video (LDV, including background video plus depth) and stereo/multiview plus depth (MVD), both of which seem to be conceptually working. For the upcoming CfP, it was decided to concentrate from now on on one technology for producing anchors, namely MVD using MVC coding for both video and depth in parallel. For the first time, reasonable results were achieved in work on "Exploration Experiment number 4" (EE4), which is the coding experiment work, by performing the second step in anchor preparation for a CfP, which is coding experiments, using AVC/MVC for both video and depth map coding. However, due to the high amount of data that were provided (combining 5 rate points each for depth and video, which amounts to 25 combinations), it was not possible to select best combinations by viewing experiments. However, it was possible to identify useful ranges of rates for each sequence, by comparing the subjective behaviour at lowest and highest rate points. This is reflected in the new EE definition. To speed up the selection of optimum rate allocation for the video and depth components, participants of EE4 were requested to perform a preview at their home lab, and make a proposal about depth/video rate combination case by case. Further, the document “Applications and Requirements of 3D Video Coding” was slightly updated to better distinguish between representation and input/output formats (N 10857). Regarding the application cases of 3D Video coding, it is currently unclear whether the two envisaged application scenarios – 1. Enhanced Stereo (baseline adaptation), and 2. future enhanced view-range displays (multiview, autostereoscopic) – would require identical timelines, an also whether their technical requirements are identical. National bodies are kindly requested to provide more information on this, and also the Exploration Experiments (EEs) are now defined around the 2 scenarios to become able of better judging the maturity of available technical solutions. The planned exploration experiments are as follows, targeting the preparation of material for the CfP based on MVD technology (N 10720):
In particular, multiview sequences captured with moving cameras are needed, and in general it appears that some of the sequences available have too large static background parts. Documents reviewed (also see AHG meeting report)
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