prostheticknowledge:

MAP Visibility Estimation for Large-Scale Dynamic 3D Reconstruction

Interesting development for 3D video: a team at Carnegie Mellon University have developed a method of video photogrammetry to capture 3D motion, using a spherical array of video cameras at various angles within a space entitled ‘The Panoptic Studio’ - video embedded below:

Many traditional challenges in reconstructing 3D motion, such as matching across wide baselines and handling occlusion, reduce in significance as the number of unique viewpoints increases. However, to obtain this benefit, a new challenge arises: estimating precisely which cameras observe which points at each instant in time. We present a maximum a posteriori (MAP) estimate of the time-varying visibility of the target points to reconstruct the 3D motion of an event from a large number of cameras. Our algorithm takes, as input, camera poses and image sequences, and outputs the time-varying set of the cameras in which a target patch is visible and its reconstructed trajectory. We model visibility estimation as a MAP estimate by incorporating various cues including photometric consistency, motion consistency, and geometric consistency, in conjunction with a prior that rewards consistent visibilities in proximal cameras. An optimal estimate of visibility is obtained by finding the minimum cut of a capacitated graph over cameras. We demonstrate that our method estimates visibility with greater accuracy, and increases tracking performance producing longer trajectories, at more locations, and at higher accuracies than methods that ignore visibility or use photometric consistency alone.

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#shesketches #bees

Best thing about this loner read is the inherited Canadian Tire money bookmark.

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explore-blog:

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explore-blog:

On July 16, 1969, Neil Armstrong, Buzz Aldrin and Michael Collins launched to the moon aboard the Apollo 11. Gizmodo has put together a nice visual essay on how the iconic spacecraft was assembled. Also see how NASA marketed the moon mission to America and how the historic Apollo spacesuit was made.

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#sketch #shesketches

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