Image processing with COSMOS

Details Image processing with COSMOS Image processing with COSMOS

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981s%26t....62..538s&link_type=abstract

Sky and Telescope, vol. 62, Dec. 1981, p. 538, 539.

Astronomy and Astrophysics

Astronomy

1

Analog To Digital Converters, Astronomical Photography, Automatic Control, Image Processing, Galaxies, Microcomputers, Microdensitometers, Minicomputers, Photographic Plates, Scanning, Stellar Luminosity

Scientific paper

It is noted that astronomers have for some time been fascinated by the possibility of automatic plate measurement and that measuring engines have been constructed with an ever increasing degree of automation. A description is given of the COSMOS (CoOrdinates, Sizes, Magnitudes, Orientations, and Shapes) system at the Royal Observatory in Edinburgh. An automatic high-speed microdensitometer controlled by a minicomputer is linked to a very fast microcomputer that performs immediate image analysis. The movable carriage, whose position in two coordinates is controlled digitally to an accuracy of 0.5 micron (0.0005 mm) will take plates as large as 356 mm on a side. It is noted that currently the machine operates primarily in the Image Analysis Mode, in which COSMOS must first detect the presence of an image. It does this by scanning and digitizing the photograph in 'raster' fashion and then searching for local enhancements in the density of the exposed emulsion.

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