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Optical Engineering

A Single-Lens Multiband Camera
Author(s): Robert K. Brooke
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Paper Abstract

The advent of multispectral remote sensing in the 1960s1 evoked interest in its possible application as an acquisition tool, providing information needed to produce topographic and special-purpose thematic maps for civil and military use. Subsequently, the U. S. Army Engineer Topographic Laboratories initiated a program to investigate optimization of this technology by studying the options and tradeoffs. In the course of the investigation, it was determined that the per-formance characteristics of existing multiband cameras and multispectral scanners were unacceptable for evaluating the full potential of multiband imagery for mapping applications for several reasons. With conventional multi-lens and multi-camera photographic systems,293 the primary shortcomings became evident when additive color techniques4 were employed to display the spectrally separated images. The additive color display requires the superposition of several images, projected through spectral filters (nominally red, green, and blue) to exhibit color and false color renditions of a recorded scene. Severe restrictions on the permissible relative distortion between images must be imposed if high-quality displays are to be achieved. The difficulties encountered in shutter synchronization, boresighting, and lens matching are inher-ent sources of relative distortion which must be overcome to obtain coincident, spectrally isolated imagery using conventional camera systems. On the other hand, multispectral scanners, while avoiding some of the distortion problems, lacked resolving power. In order to avoid the limitations imposed by existing equipment, it was decided that a high-performance, experimental multiband camera would be built to provide input imagery for the evaluation. The goal would be to obtain multispectral imagery with minimum relative distortion and maximum resolution for display using additive color techniques.

Paper Details

Date Published: 1 August 1975
PDF: 4 pages
Opt. Eng. 14(4) 144347 doi: 10.1117/12.7971843
Published in: Optical Engineering Volume 14, Issue 4
Show Author Affiliations
Robert K. Brooke, U. S. Army Engineer Topographic Laboratories (United States)

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