Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing
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Goyal_Diffuse Imaging.pdf
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Author(s)
Kirmani, Ahmed
Jeelani, Haris
Goyal, Vivek K.
Date Issued
October 2011
Journal
IEEE Signal Processing Letters
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Kirmani, Ahmed et al. “Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing.” IEEE Signal Processing Letters 19.1 (2012): 31–34.
Version
Author's final manuscript
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 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 . The discrete-time samples are processed to obtain -regularized estimates of . Improving on previous work, using nonimpulsive, bandlimited light sources instead of impulsive illumination significantly improves signal-to-noise ratio (SNR) and reconstruction quality. Our simulations suggest that practical diffuse imaging applications may be realized with commercially-available temporal light intensity modulators and sensors used in standard optical communication systems.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1109/lsp.2011.2174222
