Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..538a&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 687, p. 538-550.
Astronomy and Astrophysics
Astronomy
16
Astronomical Photometry, Image Processing, Iue, Signal Processing, Signal To Noise Ratios, Wave Dispersion, Cosmic Rays, Power Spectra, Random Noise, Spectrum Analysis, Ultraviolet Astronomy, White Noise
Scientific paper
Photometrically corrected images from the IUE's two intensified vidicon cameras are used to explore the character of detector noise, and a protocol for the derivation of realistic noise models is proposed on the basis of available collections of UV-Flood calibration images. The incomplete removal of the pixel-to-pixel sensitivity pattern can lead to a factor-of-2 enhancement in apparent noise; even with good suppression of pixel granularity, the remaining random noise can exhibit saturation behavior which causes S/N to cease improving with increasing exposure. When all relevant effects are considered, underlying, 'pristine' noise models show virtually no dependence on spatial position.
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