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Candace Berrett - Brigham Young University

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” Hyperspectral Image Analysis Using a Bayesian Nonparametric Model”
06 February 2014 from 4:00 PM to 5:00 PM
201 Thomas Building
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Abstract: Long wave infrared (LWIR) hyperspectral imagers (HSI) image a scene by collecting high-resolution spectra at each pixel.  The data are similar to a camera image but have a large number of narrow spectral bands rather than the familiar broad three bands of red-green-blue in a traditional digital camera. The measured spectra are a convolution of the material spectra (emissivity), the black body temperature (Planck curve), other interacting environmental spectral sources, and measurement error.  One approach to material identification is temperature-emissivity separation (TES), which separates or deconvolves the material spectra from the temperature curve.  To accomplish this task, we develop a unique flexible model which combines the mathematical model of the physical processes within a Bayesian nonparametric framework.  In addition to offering interpretable estimates of model parameters, this model is able to identify material emissivity spectra and cluster pixels into appropriate material groups.  We demonstrate our method using both a synthetic and measured data set.

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