Importance of segment exposure for detection of faint objects

Details Importance of segment exposure for detection of faint objects Importance of segment exposure for detection of faint objects

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981crasb.292..837b&link_type=abstract

Academie des Sciences (Paris), Comptes Rendus, Serie II - Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Ter

Mathematics

Probability

Astronomical Photography, Faint Objects, Image Resolution, Imaging Techniques, Point Sources, Astronomical Photometry, Luminous Intensity, Probability Theory, Radiation Counters

Scientific paper

Photon counting TV receivers or photon counting cameras generate images by means of temporally segmented exposures. It is shown that in the case of faint objects against bright backgrounds, an image integrating all data supplies less information than temporal segment images each of which contains fewer events. The statistical probability method used to demonstrate this shows that two exposures reduce uncertainty in comparison with one and thus fewer photons are necessary to detect a point object while fainter objects can be detected. For the general case of several exposures it is shown that the maximum uncertainty gain is 1.91 which can be five or six exposures.

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