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- Achuta Kadambi
- Massachusetts Institute of Technology, Boston
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- Refael Whyte
- University of Waikato, Waikato, NZ and Massachusetts Institute of Technology, Boston
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- Ayush Bhandari
- Massachusetts Institute of Technology, Boston
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- Lee Streeter
- University of Waikato, Waikato, NZ
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- Christopher Barsi
- Massachusetts Institute of Technology, Boston
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- Adrian Dorrington
- University of Waikato, Waikato, NZ
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- Ramesh Raskar
- Massachusetts Institute of Technology, Boston
書誌事項
- タイトル別名
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- sparse deconvolution to address multipath interference and recover time profiles
この論文をさがす
説明
<jats:p>Time of flight cameras produce real-time range maps at a relatively low cost using continuous wave amplitude modulation and demodulation. However, they are geared to measure range (or phase) for a single reflected bounce of light and suffer from systematic errors due to multipath interference.</jats:p> <jats:p>We re-purpose the conventional time of flight device for a new goal: to recover per-pixel sparse time profiles expressed as a sequence of impulses. With this modification, we show that we can not only address multipath interference but also enable new applications such as recovering depth of near-transparent surfaces, looking through diffusers and creating time-profile movies of sweeping light.</jats:p> <jats:p>Our key idea is to formulate the forward amplitude modulated light propagation as a convolution with custom codes, record samples by introducing a simple sequence of electronic time delays, and perform sparse deconvolution to recover sequences of Diracs that correspond to multipath returns. Applications to computer vision include ranging of near-transparent objects and subsurface imaging through diffusers. Our low cost prototype may lead to new insights regarding forward and inverse problems in light transport.</jats:p>
収録刊行物
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- ACM Transactions on Graphics
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ACM Transactions on Graphics 32 (6), 1-10, 2013-11
Association for Computing Machinery (ACM)
