Video rate spectral imaging using a coded aperture snapshot spectral imager

Ashwin A. Wagadarikar, Nikos P. Pitsianis, Xiaobai Sun, David J. Brady

Research output: Contribution to journalArticlepeer-review

279 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)6368-6388
Number of pages21
JournalOptics Express
Issue number8
StatePublished - Apr 13 2009
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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