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Proceedings Paper

An analysis of spatial distortion, calibration, and translation effects for a scene projector
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Paper Abstract

The effects of distortion in the complex optical system of an IR scene projector have motivated the development of methods for spatial calibration for scene projectors. A typical method utilizes the projection of a set of test images, with careful measurement of the location of points in the image. Given the projected and measured positions, a parametric model is used to describe the spatial “distortion” of the projection system. This distortion model can then be used for a variety of purposes, including pre-processing the images to be projected so that the distortion of the projection system is pre-compensated, and the distortion of the projection system is negated. This application and specific method have been demonstrated, and can compensate for a variety of distortion and alignment effects in the projector / sensor configuration. Personnel at the Kinetic Kill Vehicle Hardware-in-the-loop Simulator (KHILS) facility have demonstrated compensation and co-alignment of 2-color projection systems with sub-pixel precision using this technique. This paper describes an analysis of a situation in which pre-compensated images are translated (either mechanically or optically) to simulate motion of a target object or adjust alignment of the sensor and projector. The effect of physically translating images that had been pre-compensated for a different projector/sensor alignment was analyzed. We describe the results of a study of the translation and distortion effects, and characterize the expected performance of a testing procedure that requires translation of the pre-compensated images.

Paper Details

Date Published: 12 September 2003
PDF: 9 pages
Proc. SPIE 5092, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing VIII, (12 September 2003); doi: 10.1117/12.488451
Show Author Affiliations
Breck A. Sieglinger, Consultant for MacAulay-Brown, Inc. (United States)
David S. Flynn, Consultant for MacAulay-Brown, Inc. (United States)
George C. Goldsmith, Air Force Research Lab. (United States)
Rhoe A. Thompson, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 5092:
Technologies for Synthetic Environments: Hardware-in-the-Loop Testing VIII
Robert Lee Murrer, Editor(s)

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