Video rate spectral imaging using a coded aperture snapshot spectral imager

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 significant advances in the design of the optical system, s...

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Bibliographic Details
Published in:Optics express 2009-04, Vol.17 (8), p.6368-6388
Main Authors: Wagadarikar, Ashwin A, Pitsianis, Nikos P, Sun, Xiaobai, Brady, David J
Format: Article
Language:English
Subjects:
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Image Interpretation, Computer-Assisted - instrumentation
Reproducibility of Results
Sensitivity and Specificity
Spectrum Analysis - instrumentation
Video Recording - instrumentation
Online Access:Get full text
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Summary: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 significant 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 configuration, 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 and compressed measurements. We utilize CASSI's snapshot ability to demonstrate a spectral image video of multi-colored candles with live flames captured at 30 frames per second.
ISSN:1094-4087
DOI:10.1364/OE.17.006368