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Proceedings Paper

Diffuse imaging: replacing lenses and mirrors with omnitemporal cameras
Author(s): Ahmed Kirmani; Haris Jeelani; Vahid Montazerhodjat; Vivek K. Goyal
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Paper Abstract

Conventional imaging uses steady-state illumination and light sensing with focusing optics; variations of the light field with time are not exploited. We develop a signal processing framework for estimating the reflectance f of a Lambertian planar surface in a known position using omnidirectional, time-varying illumination and unfocused, time-resolved sensing in place of traditional optical elements such as lenses and mirrors. Our model associates time sampling of the intensity of light incident at each sensor with a linear functional of f. The discrete-time samples are processed to obtain ℓ2-regularized estimates of f. Using non-impulsive, bandlimited light sources instead of impulsive illumination significantly improves signal-to-noise ratio (SNR) and reconstruction quality.

Paper Details

Date Published: 27 September 2011
PDF: 6 pages
Proc. SPIE 8138, Wavelets and Sparsity XIV, 81380O (27 September 2011); doi: 10.1117/12.896718
Show Author Affiliations
Ahmed Kirmani, Massachusetts Institute of Technology (United States)
Haris Jeelani, Massachusetts Institute of Technology (United States)
Vahid Montazerhodjat, Massachusetts Institute of Technology (United States)
Vivek K. Goyal, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 8138:
Wavelets and Sparsity XIV
Manos Papadakis; Dimitri Van De Ville; Vivek K. Goyal, Editor(s)

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