Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/8.0.0/doc/omdetect/node21.html
Дата изменения: Wed Oct 22 17:31:26 2008
Дата индексирования: Tue Aug 18 14:53:45 2009
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Поисковые слова: rigel

XMM-Newton Science Analysis System


omdetect (omdetect-5.14.2) [???]

Meta Index / Home Page / Algorithm

General Comments

Omdetect will find sources on an image using both a peak-finding and connected-pixel algorithm. The former will mainly detect ``point'' sources and the latter ``extended'' sources. The peak-finding algorithm is used first to try to locate all point sources, in order of decreasing brightness. This algorithm mainly overcomes problems with modular-8 patterns around bright sources and scattered light features. When the detection algorithms have finished, photometry is performed on the sources and then the flagging algorithms are run.