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Reinterpretable Imager: Ultimate Post-Capture Control in Photography

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Uploaded on Apr 27, 2010

Take a photo: Decide later if it stays a photo, becomes a video or turns into a lightfield so you can digitally refocus. Ultimate post-capture control in software.

Amit Agrawal (MERL), Ashok Veeraraghavan (MERL) and Ramesh Raskar

We describe a novelmultiplexing approach to achieve tradeoffs in space, angle and time resolution in photography. We explore the problem of mapping useful subsets of time-varying 4D lightfields in a single snapshot. Our design is based on using a dynamic mask in the aperture and a static mask close to the sensor. The key idea is to exploit scene-specific redundancy along spatial, angular and temporal dimensions and to provide a programmable or variable resolution tradeoff among these dimensions. This allows a user to reinterpret the single captured photo as either a high spatial resolution image, a refocusable image stack or a video for different parts of the scene in post-processing.

A lightfield camera or a video camera forces a-priori choice in space-angle-time resolution. We demonstrate a single prototype which provides flexible post-capture abilities not possible using either a single-shot lightfield camera or a multi-frame video camera. We show several novel results including digital refocusing on objects moving in depth and capturing multiple facial expressions in a single photo.

More details http://www.umiacs.umd.edu/~aagrawal/e...

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