1 January 1991 Intensified multispectral imaging measuring in the spatial, frequency, and time domains with a single instrument
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Traditional multispectral and intensified video technologies are a perfect match for a variety of applications. Described here is an instrument which combines these technologies with advanced microprocessor control and high-speed electronic gating to provide the core for a new type of measurement system. Such a system is particularly suited to remote-sensing work with small aircraft but its high sensitivity and calibration capabilities make it a flexible tool for multispectral measurement detection and classification applications in the laboratory or in the field. 1. A MULTISPECTRAL VIDEO PRIMER Multispectral imaging differs from ordinary imaging in that each scene is separated into several spectral " slices. " Thus a multispectral picture is a set of images from which we can extract not only spatial information but spectral content as well. With the proper image processing techniques objects or substances can be detected or classified by their spectral signatures on a pixel-by-pixel basis. In conventional multispectral video cameras a wheel housing a set of optical filters rotates in front of the camera''s image sensor. This filter wheel spins synchronously to the video scan rate so that for every image output by the camera a different filter exposes the image sensor. Thus the camera outputs a repeating sequence of images each measuring the response of the subject in a different region of the spectrum. The overall spectral response of a conventional multispectral camera is dictated by
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Benjamin J. Kennedy, Benjamin J. Kennedy, } "Intensified multispectral imaging measuring in the spatial, frequency, and time domains with a single instrument", Proc. SPIE 1346, Ultrahigh- and High-Speed Photography, Videography, Photonics, and Velocimetry '90, (1 January 1991); doi: 10.1117/12.23385; https://doi.org/10.1117/12.23385


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