Characteristic curves of photographic data made with a film scanner.

Details Characteristic curves of photographic data made with a film scanner. Characteristic curves of photographic data made with a film scanner.

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999rnaoj...4..107i&link_type=abstract

Rep. Natl. Astron. Obs. Jpn., Vol. 4, No. 2, p. 107 - 113

Astronomy and Astrophysics

Astronomy

Image Processing: Photographs

Scientific paper

Thanks to the development of CCD camera and digital technologies, photographic observations in astronomy has been getting less popular and hence facilities to analyze the photographic data such as micro-densitometers are disappearing. Instead, a film scanning device with a linear CCD array (a film scanner), which can be controlled by a personal computer, becomes available and much more popular for a personal use. Hence, it is worth while examining the digitization accuracy of the commercial-based film scanner and seeking the possibility to replace the micro-densitometer with it. The authors found that the film scanner gives good accuracy in comparison with the micro-densitometer if the data are handled properly. They describe the method and technique how to calibrate photographic data using the film scanner.

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