CAMERA-BASED VIDEO SYNCHRONIZATION FOR A FEDERATION OF MOBILE PROJECTORS
Kiarash Amiri, Shih Hsien Yang, Fadi Kurdahi, Magda El Zarki, Aditi MajumderAbstract
Ultra-portable projectors, called pico-projectors, are now being embedded in mobile devices like cell-phones. Such mobile devices are projected to be the primary device to be used by younger people for ubiquitous sharing of all possible media initiating novel social interaction paradigms. However, the pico-projectors offer a much lower resolution and brightness than a standard projector. On the other hand, images displayed from multiple such mobile devices can be tiled to create a dramatically improved display in both brightness and resolution. This will allow multiple users to view and share media at a much higher quality. In this demo, we present a camera-based video synchronization algorithm that allows a federation of projection enabled portable devices to together present a synchronized video stream, though only a smaller part of the video comes from each device. Since our synchronization does not happen on the mobile network, it is independent of network congestion and connectivity. We combined our method with existing techniques to register images across projectors and demonstrate a synchronized video stream for a federation of 2×2 array of four projectors. To the best of our knowledge, this is the first time camera-based techniques have been used to mitigate network uncertainties to achieve accurate video synchronization across multiple devices.
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