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Pre-processing of the image

PISAFIND expects there to be no background variation in the image array. Any such variations should be removed in advance with a suitable application, such as SURFIT in KAPPA [6]. The frame should also be clean of any defects and bad pixels.


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PISA [2.5ex Position Intensity and Shape Analysis
Starlink User Note 109
Peter W. Draper and Nicholas Eaton
23 October 2002
E-mail:ussc@star.rl.ac.uk

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