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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 6 — Mar. 15, 2014
  • pp: 1705–1708

Resolving multipath interference in time-of-flight imaging via modulation frequency diversity and sparse regularization

Ayush Bhandari, Achuta Kadambi, Refael Whyte, Christopher Barsi, Micha Feigin, Adrian Dorrington, and Ramesh Raskar  »View Author Affiliations

Optics Letters, Vol. 39, Issue 6, pp. 1705-1708 (2014)

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Time-of-flight (ToF) cameras calculate depth maps by reconstructing phase shifts of amplitude-modulated signals. For broad illumination of transparent objects, reflections from multiple scene points can illuminate a given pixel, giving rise to an erroneous depth map. We report here a sparsity-regularized solution that separates K interfering components using multiple modulation frequency measurements. The method maps ToF imaging to the general framework of spectral estimation theory and has applications in improving depth profiles and exploiting multiple scattering.

© 2014 Optical Society of America

OCIS Codes
(100.6890) Image processing : Three-dimensional image processing
(110.6880) Imaging systems : Three-dimensional image acquisition
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(150.5670) Machine vision : Range finding

ToC Category:
Machine Vision

Original Manuscript: November 12, 2013
Revised Manuscript: February 5, 2014
Manuscript Accepted: February 7, 2014
Published: March 14, 2014

Ayush Bhandari, Achuta Kadambi, Refael Whyte, Christopher Barsi, Micha Feigin, Adrian Dorrington, and Ramesh Raskar, "Resolving multipath interference in time-of-flight imaging via modulation frequency diversity and sparse regularization," Opt. Lett. 39, 1705-1708 (2014)

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