Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing
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, tim...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Institute of Electrical and Electronics Engineers (IEEE)
2012
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| Online Access: | http://hdl.handle.net/1721.1/72596 |
| _version_ | 1826192340782415872 |
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| author | Kirmani, Ahmed Jeelani, Haris Goyal, Vivek K. |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Kirmani, Ahmed Jeelani, Haris Goyal, Vivek K. |
| author_sort | Kirmani, Ahmed |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T09:09:41Z |
| format | Article |
| id | mit-1721.1/72596 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:09:41Z |
| publishDate | 2012 |
| publisher | Institute of Electrical and Electronics Engineers (IEEE) |
| record_format | dspace |
| spelling | mit-1721.1/725962022-09-26T10:53:50Z Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing Kirmani, Ahmed Jeelani, Haris Goyal, Vivek K. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Research Laboratory of Electronics Goyal, Vivek K. Kirmani, Ahmed Goyal, Vivek K. 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. National Science Foundation (U.S.). (Grant number 0643836) United States. Defense Advanced Research Projects Agency. Information in a Photon Program (United States. Army Research Office)(Award number W911-NF-10-1-0404) Texas Instruments Leadership University Consortium Program 2012-09-10T17:15:37Z 2012-09-10T17:15:37Z 2011-10 2011-08 Article http://purl.org/eprint/type/JournalArticle 1070-9908 http://hdl.handle.net/1721.1/72596 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. en_US http://dx.doi.org/10.1109/lsp.2011.2174222 IEEE Signal Processing Letters Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf Institute of Electrical and Electronics Engineers (IEEE) MIT web domain |
| spellingShingle | Kirmani, Ahmed Jeelani, Haris Goyal, Vivek K. Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing |
| title | Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing |
| title_full | Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing |
| title_fullStr | Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing |
| title_full_unstemmed | Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing |
| title_short | Diffuse Imaging: Creating Optical Images With Unfocused Time-Resolved Illumination and Sensing |
| title_sort | diffuse imaging creating optical images with unfocused time resolved illumination and sensing |
| url | http://hdl.handle.net/1721.1/72596 |
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