Diffuse imaging: Replacing lenses and mirrors with omnitemporal cameras
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, t...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Society of Photo-optical Instrumentation Engineers
2012
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| Online Access: | http://hdl.handle.net/1721.1/71839 https://orcid.org/0000-0001-8735-3631 |
| _version_ | 1811091776180584448 |
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| author | Kirmani, Ahmed Jeelani, Haris Montazerhodjat, Vahid 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 Montazerhodjat, Vahid 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 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. |
| first_indexed | 2024-09-23T15:07:45Z |
| format | Article |
| id | mit-1721.1/71839 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:07:45Z |
| publishDate | 2012 |
| publisher | Society of Photo-optical Instrumentation Engineers |
| record_format | dspace |
| spelling | mit-1721.1/718392022-09-29T12:53:30Z Diffuse imaging: Replacing lenses and mirrors with omnitemporal cameras Kirmani, Ahmed Jeelani, Haris Montazerhodjat, Vahid 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. Goyal, Vivek K. Kirmani, Ahmed Montazerhodjat, Vahid 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. National Science Foundation (U.S.) (Grant No. 0643836) United States. Defense Advanced Research Projects Agency (InPho program through the US Army Research Office award W911-NF-10-1-0404) Texas Instruments Incorporated (Leadership University Program) Massachusetts Institute of Technology (Esther and Harold E. Edgerton Career Development Chair) 2012-07-26T15:44:15Z 2012-07-26T15:44:15Z 2011-08 Article http://purl.org/eprint/type/JournalArticle 9780819487483 0819487481 0277-786X http://hdl.handle.net/1721.1/71839 Kirmani, Ahmed et al. “Diffuse Imaging: Replacing Lenses and Mirrors with Omnitemporal Cameras.” Wavelets and Sparsity XIV Conference, August 21, 2011, San Diego, California, USA (Proc. SPIE 8138), 2011. 81380O–81380O–6. Web. https://orcid.org/0000-0001-8735-3631 en_US http://dx.doi.org/10.1117/12.896718 Wavelets and Sparsity XIV, Conference 2011 Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Society of Photo-optical Instrumentation Engineers SPIE |
| spellingShingle | Kirmani, Ahmed Jeelani, Haris Montazerhodjat, Vahid Goyal, Vivek K. Diffuse imaging: Replacing lenses and mirrors with omnitemporal cameras |
| title | Diffuse imaging: Replacing lenses and mirrors with omnitemporal cameras |
| title_full | Diffuse imaging: Replacing lenses and mirrors with omnitemporal cameras |
| title_fullStr | Diffuse imaging: Replacing lenses and mirrors with omnitemporal cameras |
| title_full_unstemmed | Diffuse imaging: Replacing lenses and mirrors with omnitemporal cameras |
| title_short | Diffuse imaging: Replacing lenses and mirrors with omnitemporal cameras |
| title_sort | diffuse imaging replacing lenses and mirrors with omnitemporal cameras |
| url | http://hdl.handle.net/1721.1/71839 https://orcid.org/0000-0001-8735-3631 |
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