Browsing by Author "Hagen, Nathan"

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    Image mapping spectrometry: calibration and characterization
    (Society of Photo-Optical Instrumentation Engineers, 2012) Bedard, Noah; Hagen, Nathan; Gao, Liang; Tkaczyk, Tomasz S.
    Image mapping spectrometry (IMS) is a hyperspectral imaging technique that simultaneously captures spatial and spectral information about an object in real-time. We present a new calibration procedure for the IMS as well as the first detailed evaluation of system performance. We correlate optical components and device calibration to performance metrics such as light throughput, scattered light, distortion, spectral image coregistration, and spatial/spectral resolution. Spectral sensitivity and motion artifacts are also evaluated with a dynamic biological experiment. The presented methodology of evaluation is useful in assessment of a variety of hyperspectral and multi-spectral modalities. Results are important to any potential users/ developers of an IMS instrument and to anyone who may wish to compare the IMS to other imaging spectrometers.
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    Snapshot advantage: a review of the light collection improvement for parallel high-dimensional measurement systems
    (Society of Photo-Optical Instrumentation Engineers, 2012) Hagen, Nathan; Kester, Robert T.; Gao, Liang; Tkaczyk, Tomasz S.
    The snapshot advantage is a large increase in light collection efficiency available to highdimensional measurement systems that avoid filtering and scanning. After discussing this advantage in the context of imaging spectrometry, where the greatest effort towards developing snapshot systems has been made, we describe the types of measurements where it is applicable. We then generalize it to the larger context of high-dimensional measurements, where the advantage increases geometrically with measurement dimensionality.