Recovering three-dimensional shape around a corner using ultrafast time-of-flight imaging

Andreas Velten, Thomas Willwacher, Otkrist Gupta, Ashok Veeraraghavan, Moungi G. Bawendi and Ramesh Raskar ()
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Andreas Velten: MIT Media Lab, Massachusetts Institute of Technology
Thomas Willwacher: Harvard University
Otkrist Gupta: MIT Media Lab, Massachusetts Institute of Technology
Ashok Veeraraghavan: Rice University
Moungi G. Bawendi: Massachusetts Institute of Technology
Ramesh Raskar: MIT Media Lab, Massachusetts Institute of Technology

Nature Communications, 2012, vol. 3, issue 1, 1-8

Abstract: Abstract The recovery of objects obscured by scattering is an important goal in imaging and has been approached by exploiting, for example, coherence properties, ballistic photons or penetrating wavelengths. Common methods use scattered light transmitted through an occluding material, although these fail if the occluder is opaque. Light is scattered not only by transmission through objects, but also by multiple reflection from diffuse surfaces in a scene. This reflected light contains information about the scene that becomes mixed by the diffuse reflections before reaching the image sensor. This mixing is difficult to decode using traditional cameras. Here we report the combination of a time-of-flight technique and computational reconstruction algorithms to untangle image information mixed by diffuse reflection. We demonstrate a three-dimensional range camera able to look around a corner using diffusely reflected light that achieves sub-millimetre depth precision and centimetre lateral precision over 40 cm×40 cm×40 cm of hidden space.

Date: 2012
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DOI: 10.1038/ncomms1747

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