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Analysis of Images with the APM System at Cambridge

Published online by Cambridge University Press:  12 April 2016

E. Kibblewhite ,
M. Bridgeland ,
P. Bunclark ,
M. Cawson  and
M. Irwin
E. Kibblewhite
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UK
M. Bridgeland
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UK
P. Bunclark
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UK
M. Cawson
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UK
M. Irwin
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UK

Extract

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The Automated Photographic Measuring (APM) system at Cambridge was started many years ago to analyse Schmidt plates, and its progress has been reported at a number of these conferences. Only brief details of its design will be given in this paper.

The system consists of a very accurate laser-beam scanning microdensitometer connected to a series of on-line computers. The microdensitometer (Figure 1) uses a 5500 kg x-y table to position the plate. The plate transmission is digitised to 12-bit accuracy at a rate of one sample every 4 microseconds, although the image processing hardware limits this speed in practice. Special-purpose hardware exists to convert the transmission measurements into density or intensity estimates, to smooth the spot-size digitally, to measure the background and to compute image parameters.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 78: Astronomy with Schmidt-type telescopes , 1984 , pp. 89 - 97
Copyright
Copyright © Reidel 1984

References

Cawson, M.G.M., 1983. Ph.D. thesis, Cambridge, England Google Scholar
Kibblewhite, E.J., Bridgeland, M.T., Hooley, T.A. & Horne, D., 1975. Image Processing Techniques in Astronomy, ed. de Jager, 245–246.Google Scholar
Kibblewhite, E.J., Bridgeland, M.T., Bunclark, P. & Irwin, M.J., 1983. Proc. Astronomical Microdensitometry Conference, Washington (in press).Google Scholar
Schneider, S.E., Helon, G., Salpeter, E.E. & Terzain, Y., 1983. Ap.J. Lett., 273, L1 - L5.CrossRefGoogle Scholar