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Proceedings Paper

Performance Verification Of An Automated Image Cataloging System
Author(s): J. F. Jarvis; J. A. Tyson
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Paper Abstract

A system, FOCAS (Faint Object Classification and Analysis System), designed to automatically detect and catalog stellar and galactic images on photographic plates is described. FOCAS was designed and is used to find all objects brighter than a limiting magnitude (24th on nitrogen baked IIIaJ plates exposed for one hour on the KPNO 4m telescope) and classify each image as stellar (nonresolved) or galactic (resolved). An important task in the implementation of this system is to verify that it performs as designed and to establish its limitations. The following internal tests were made to establish confidence in the automated cataloging system. Processing and comparing objects from two plates of the same field yields information about object detection efficiency and classification consistency. Processing synthesized dim stellar images provides detection efficiency information. Classification of synthesized stellar and galactic images gives information regarding classification accuracy. Processing a uniformly fogged plate establishes the magnitude where emulsion irregularities begin being detected as images. Comparison of FOCAS results with deeper CCD and video camera images corroborates these internal tests.

Paper Details

Date Published: 21 November 1980
PDF: 8 pages
Proc. SPIE 0264, Applications of Digital Image Processing to Astronomy, (21 November 1980); doi: 10.1117/12.959808
Show Author Affiliations
J. F. Jarvis, Bell Laboratories (United States)
J. A. Tyson, Bell Laboratories (United States)


Published in SPIE Proceedings Vol. 0264:
Applications of Digital Image Processing to Astronomy
Denis A. Elliot, Editor(s)

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