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Proceedings Paper

Infrared passive ranging using sea background for accurate sensor registration
Author(s): J. Patrick Reilly; Larry T. Younkins; Robert Joseph Taylor
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Paper Abstract

Target range can be determined via triangulation with two IR sensors located along a known baseline. Achievable range accuracy depends on the baseline length, camera height, accuracy of relative orientation of cameras, and the accuracy of the angular position of the target. This paper investigates a method for determining the relative azimuth pointing angles of two IR cameras using a novel method in which sea background contrast features are used for registration. The method employs scene matching of sea contrast features with correction for optical distortion of the images and parallax. To evaluate this technique, IR scenes containing a target over the sea were acquired with two focal plane array IR sensors separated by about 30 m, and placed 30 m above sea level. Cross correlation functions were used for camera registration, and target range was calculated. Even with low sea-state conditions and low contrast irradiance, sufficient contrast features existed to generate meaningful cross-correlation functions. A requirement of the method is that the horizon must be accurately located in one of the two image pairs. The paper discusses experimental procedures, errors, data processing, and some results.

Paper Details

Date Published: 2 June 1995
PDF: 12 pages
Proc. SPIE 2469, Targets and Backgrounds: Characterization and Representation, (2 June 1995); doi: 10.1117/12.210600
Show Author Affiliations
J. Patrick Reilly, Johns Hopkins Univ. (United States)
Larry T. Younkins, Johns Hopkins Univ. (United States)
Robert Joseph Taylor, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 2469:
Targets and Backgrounds: Characterization and Representation
Wendell R. Watkins; Dieter Clement, Editor(s)

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