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Proceedings Paper

Clutter characterization algorithms for Fourier transform hyperspectral imagers
Author(s): Robert D. Sears; James C. Fraser; M. Winings; Leonard John Otten; Theodore S. Turner; John R. O'Hair
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Paper Abstract

Background clutter and target signatures have traditionally been described by parameters derived form measurements of spatial structure and spectral ratios derived from fixed spectral bandpass images. The advent of hyperspectral imagery requires descriptions of background clutter in a mixed wavelength-spatial or Fourier-transformed (FT) spectral - spatial framework because the data stream may contain simultaneous spatial - spectral, or FT spectral - spatial clutter components. We have developed and tested analytical routines for characterizing the background clutter and target signatures observed by Fourier-transform instruments, without requiring production of a hyperspectral data cube having spectra wavelength and 2D spatial image dimensions. The Kestrel Fourier-transform hyper spectral imager, a Sagnac format interferometer produces a data stream consisting of the Fourier spectra of the background in the in-track focal plane dimension and the spatial information int he cross-track dimension. The temporal data stream thus consists of a time series of frames in FT- spectral vs. spatial dimensions. Spectral wavelength filtering and guard-band subtraction can be accomplished in FT space by binary shift and add algorithms without prior transformation of the data into a hyperspectral data cube. Spatial filtering in the cross track dimension can similarly benefit from efficient binary operations. This paper summarizes some of the target and background clutter characterization algorithms developed and their evaluation against an example atmospheric gas detection scenario.

Paper Details

Date Published: 4 August 1997
PDF: 9 pages
Proc. SPIE 3071, Algorithms for Multispectral and Hyperspectral Imagery III, (4 August 1997); doi: 10.1117/12.280590
Show Author Affiliations
Robert D. Sears, Vanguard Research Inc (United States)
James C. Fraser, Vanguard Research Inc (United States)
M. Winings, Vanguard Research Inc (United States)
Leonard John Otten, Kestrel Corp. (United States)
Theodore S. Turner, Air Force Phillips Lab. (United States)
John R. O'Hair, Air Force Phillips Lab. (United States)


Published in SPIE Proceedings Vol. 3071:
Algorithms for Multispectral and Hyperspectral Imagery III
A. Evan Iverson; Sylvia S. Shen, Editor(s)

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