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Video rate spectral imaging using a CA snapshot spectral imager Brady 2009.pdf.pdf


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Video rate spectral imaging using a CA snapshot spectral imager Brady 2009.pdf.pdf
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Video rate spectral imaging using a coded aperture snapshot spectral imager Ashwin A. Wagadarikar a, Nikos P. Pitsianis abc, Xiaobai Sun b, David J. Brady a aDepartment of Electrical puter Engineering, Duke University, Durham, NC27708 bDepartment puter Science, Duke University, Durham, NC 27708, USA cDepartment of Electrical puter Engineering, Aristotle University, Thessaloniki,54124, Greece ******@duke.edu e.edu Abstract: We have previously reported on coded aperture snapshot spectral imagers (CASSI) that can capture a full frame spectral image in a snapshot. Here we describe the use of CASSI for spectral imaging of a dynamic scene at video rate. We describe signi?cant advances in the design of the optical system, system calibration procedures and reconstruction method. The new optical system uses a double Amici prism to achieve an in-line, direct view con?guration, resulting in a substantial improvement in image quality. We describe NeAREst, an algorithm for estimating the instantaneous three-dimensional spatio-spectral data cube from CASSI’s two-dimensional array of encoded pressed measurements. We utilize CASSI’s snapshot ability to demonstrate a spectral image video of multi-colored candles with live ?ames captured at30frames per second. ?2009 Optical Society of America OCIS codes:(300.6190) Spectrometers, (110.0110) Imaging systems, (120.6200) Spectrom- eters and spectroscopic instrumentation, (999.9999) Coded aperture spectral imaging References and links 1.J. Mooney, V. Vickers, and A. Brodzik, “High throughput hyperspectral infrared camera,” J. Opt. Soc. Am. A14, 2951–2961 (1997). 2.C. Volin, B. Ford, M. Descour, J. Garcia, D. Wilson, P. Maker, and G. Bearman, “High-speed spectral imager for imaging transient ?uorescent phenomena,” Applied Optics37(34), 8112–8119 (1998). 3.K. Hege, D. O’Connell, W. Johnson, S. Basty, and E. Dereniak, “Hyperspectral imaging for astronomy and space surveillance,” vol. 5159 ofProc. SPIE, pp. 380–391 (2003). 4.W. Johnson, D. Wilson, W. Fink, M. Humayun, and G. Bearman, “Snapshot hyperspectral imaging in ophthal- mology,” Journal of Biomedical Optics12(1), 0140,361–0140,367 (2007). 5.M. Descour, C. Volin, E. Dereniak, K. Thorne, A. Schumacher, D. Wilson, and P. Maker, “Demonstration of a high-speed nonscanning imaging spectrometer,” Optics Letters22(16), 1271–1273 (1997). 6.N. Gat, G. Scriven, J. Garman, M. D. Li, and J. Zhang, “Development of four-dimensional imaging spectrometers (4D-IS),” vol. 6302 ofProc. SPIE(2006). 7.A. Wagadarikar, R. John, R. Willett, and D. J. Brady, “Single disperser design for coded aperture snapshot spectral imaging,” Applied Optics47(10), B44–B51 (2008). 8.M. Gehm, R. John, D. J. Brady, R. Willett, and T. Schulz, “Single-pressive spectral imaging with a dual-disperser architecture,” Optics Express15(21), 14,013–14,027 (2007). 9.A. Wagadarikar, N. Pitsianis, X. Sun, and D. Brady, “Spectral Image Estimation for Code
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