Power spectrum analysis of astronomical photographs digitised with small apertures

Details Power spectrum analysis of astronomical photographs digitised with small apertures Power spectrum analysis of astronomical photographs digitised with small apertures

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984asph.conf..219s&link_type=abstract

In its Astron. Phot. 1984 p 219-236 (SEE N85-16102 07-35)

Astronomy and Astrophysics

Astronomy

2

Analog To Digital Converters, Astronomical Photography, Photographic Plates, Power Spectra, Spectrum Analysis, Apertures, Photographic Emulsions, Reproduction (Copying), Signal To Noise Ratios, Sky Surveys (Astronomy)

Scientific paper

Noise characteristics of images on 8 UK Schmidt Telescope plates, 2 Anglo-Australian Telescope prime focus plates, and 2 Palomar Observatory Sky Survey (POSS) copies (comprising 3 different emulsion types) were measured with a scanning aperture of 11 microns and a pixel spacing of 16 microns. Power spectrum analysis shows plate noise (except POSS plates) to correspond to almost white noise over the frequency range 0.1 to 60 cycles/mm. The signal-to-noise power spectrum is shown to be a useful tool for measuring the information content of an astronomical photograph. Macronoise computed over 8 x 8 mm regions on the plates varies as the minus half power of the aperture area. Information content of a survey quality IIIa-J plate and atlas quality copies on very fine-grained emulsion were compared. Analysis shows no significant degradation in emulsion noise or image content of the copy relative to the original.

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