AAS 207th Meeting, 8-12 January 2006
Session 29 Observation Processing, Calibration and Control
Poster, Monday, 9:20am-7:00pm, January 9, 2006, Exhibit Hall

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[29.05] Cosmic Ray Hit Rejection Using Fuzzy Logic Modeling

L. Shamir, R. Nemiroff (Michigan Tech)

The presence of cosmic ray hits in astronomical CCD frames is frequently considered as a disturbing effect. Cosmic rays add an undesirable signal to astronomical images and can weaken algorithms of astronomical image processing. Exposures taken at high altitude observatories get more cosmic ray hits than sea level observatories. This becomes even more significant in space-based telescopes located far from a planetary magnetic field.

By using fuzzy logic modeling we obtain an algorithm that aims to reject cosmic ray hits by simulating human perception. The proposed algorithm provides high accuracy in terms of rejection and false positives, but its main advantage over previously reported algorithms is its low computational complexity, which makes it suitable for autonomous robotic telescopes returning vast pipelines of data.

Experiments suggest that the algorithm can accurately reject 97.5 0.02

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