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Proceedings Paper

Effect of a camera on scene correlation length
Author(s): James R. McManamey; Grayson W. Walker
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Paper Abstract

There has been much interest in scene correlation length as a tool for characterizing backgrounds. However, since a camera acts as a band-pass filter for spatial frequencies, with the high frequency cutoff determined by the resolution and the low frequency cutoff being determined by the field of view estimates of scene correlation length that have been calculated from digital images must be interpreted in terms of the pass-band of the camera used. The investigator must consider whether the pass band of the camera has significantly affected the spatial frequency spectrum and, as a result, the measured correlation length. In addition to filtering, the spatial frequency spectrum and the measured correlation length may be affected by aliasing. In general, high-pass filtering results in a reduction in the apparent correlation length while aliasing and low-pass filtering result in an increase in the apparent correlation length. Varying the position of the camera provides a means of detecting both filtering and aliasing, and the authors suggest criteria for determining whether these effects have significantly affected the spatial frequency spectrum and the resulting correlation length.

Paper Details

Date Published: 15 June 1994
PDF: 11 pages
Proc. SPIE 2223, Characterization and Propagation of Sources and Backgrounds, (15 June 1994); doi: 10.1117/12.177909
Show Author Affiliations
James R. McManamey, U.S. Army Belvoir Research, Development, & Engineering Ctr. (United States)
Grayson W. Walker, U.S. Army Belvoir Research, Development, & Engineering Ctr. (United States)


Published in SPIE Proceedings Vol. 2223:
Characterization and Propagation of Sources and Backgrounds
Wendell R. Watkins; Dieter Clement, Editor(s)

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