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Flexible Voxels for Motion-Aware Videography

Flexible Voxels for Motion-Aware Videography. Mohit Gupta. Amit Agrawal. Ashok Veeraraghavan. Srinivasa G. Narasimhan. y. t. Sampling of the Space-Time Volume. Motion-Aware Camera. Why is Building Such a Camera Hard?. x. Conventional Sampling Scheme:. High SR, Low TR.

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Flexible Voxels for Motion-Aware Videography

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  1. Flexible Voxels for Motion-Aware Videography Mohit Gupta AmitAgrawal Ashok Veeraraghavan Srinivasa G. Narasimhan y t Sampling of the Space-Time Volume Motion-Aware Camera Why is Building Such a Camera Hard? x Conventional Sampling Scheme: High SR, Low TR Low SR, High TR Motion Aware Video High Frame Rate (500 fps) for Fast Moving Regions Sensor Plane Frame 1 Frame 2 Frame N High Spatial Resolution (1 MP) for Static Regions Camera Integration Time Time Our Sampling Scheme: Sensor Plane Frame 1 Frame 2 Frame N Thin and long voxels Fat and short voxels Flexible voxels Post-Capture control of frame rate and spatial resolution Motion-Aware video requires flexible voxels and a priori knowledge of the scene Camera Integration Time Time Post Capture Motion-Aware Interpretation of Data Captured Data Different Spatio-temporal Interpretations Diffusion Kernels High SR High TR Space TR = 1X SR = 1X TR = 2X SR = ½ X TR = 4X SR = ¼X High SR High TR Time Re-binning Optical Flow Red = Fast, Green = Slow, Blue = Stationary Diffusion Kernels Aligned Along Flow Directions Motion-Aware Reconstruction Pixel on Captured Frame Reduced Aliasing Increasing Temporal Resolution Pixel off Anisotropic diffusion Motion-Aware reconstruction using motion information Simple re-binning results in aliasing artifacts Hardware Implementation: Fast Per-pixel Shutter Motion-Aware Video Results Fan Rotating (‘Wagon-wheel effect’) Camera Integration Projector Pattern Scene Coded Motion Blur High TR High SR Pixel 1 Beam Splitter Image Plane Pixel 2 Projector Image Plane Pixel K [Mukaigawa et al] Time Camera Input Frame (Captured at 7.5 FPS) Reconstructed Frame (60 FPS) (1 out of 8) Future work: Passive implementation using LCoS Multi-Use Light Engine (MULE) Co-located projector camera setup Fast optical modulation Pico-Projector (1440Hz.) ($350)

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