Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..375a&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 92, June 1980, p. 375-381.
Astronomy and Astrophysics
Astronomy
2
Autoradiography, Image Enhancement, Image Intensifiers, Image Processing, Photographic Film, Quantitative Analysis, Thioureas, Digital Data, Photographic Emulsions, Signal To Noise Ratios, Wiener Filtering
Scientific paper
Photographic images enhanced by the method of Thiourea-S35 autoradiography are evaluated in terms of signal-to-noise ratio, detective quantum efficiency (DQE), and Wiener spectrum analysis using digitized images. It is determined that the original signal-to-noise ratio is not degraded by the intensification process which allows an increase in the practical working DQE as a function of density. These results apply at all spatial frequencies that were tested. The advantage given by autoradiography is the ability to produce usable images from emulsions originally exposed to the low densities corresponding to maximum DQE and movement of faint image densities above the level of the threshold for detection.
Askins B. S.
Odell C. R.
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