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Proceedings Paper

Chemical plume detection with an iterative background estimation technique
Author(s): Eric Truslow; Steven Golowich; Dimitris Manolakis
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Paper Abstract

The detection of chemical vapor plumes using passive hyperspectral sensors operating in the longwave infrared is a challenging problem with many applications. For adequate performance, detection algorithms require an estimate of a scene’s background statistics, including the mean and covariance. Diffuse plumes with a large spatial extent are particularly difficult to detect in single-image schemes because of contamination of background statistics by the plume. To mitigate the effects of plume contamination, a first pass of the detector can be used to create a background mask. However, large diffuse plumes are typically not removed by a single pass. Instead, contamination can be reduced by using smoothed detection results as a background mask. In the proposed procedure, a detector bank is run on the cube, and a threshold applied to produce a binary image. The binary image can be modeled as a spatial point process consisting of high density and low density regions. By applying a spatial filter to the detection image, regions with overall higher intensity are detected as containing plume and can be removed from background statistic estimates. The key intuition is that regions with a higher density of hits are more likely to contain plume since plumes are spatially contiguous. We demonstrate with real plume data that this method can drastically improve detection performance over the single-pass method, and explore tradeoffs between different filter sizes and thresholds.

Paper Details

Date Published: 17 May 2016
PDF: 14 pages
Proc. SPIE 9840, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXII, 98401M (17 May 2016); doi: 10.1117/12.2224350
Show Author Affiliations
Eric Truslow, MIT Lincoln Lab. (United States)
Steven Golowich, MIT Lincoln Lab. (United States)
Dimitris Manolakis, MIT Lincoln Lab. (United States)

Published in SPIE Proceedings Vol. 9840:
Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXII
Miguel Velez-Reyes; David W. Messinger, Editor(s)

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