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Дата изменения: Wed Oct 22 17:31:26 2008
Дата индексирования: Tue Aug 18 14:53:47 2009
Кодировка:
The detection algorithms XMM-Newton SAS Home Page
XMM-Newton Science Analysis System


omdetect (omdetect-5.14.2) [???]

Summary of the algorithm Algorithm Point-source detection algorithm Home Index

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The detection algorithms

Omdetect uses two different algorithms for source-detection - one is optimised for detecting point-like sources, and the second is optimised for detecting extended sources.

To make the program execute as quickly as possible, all arrays are implemented as pointers, to avoid unnecessary copying.

Because it is not known how many sources may be detected, and to save memory, omdetect uses two linked-lists to store parameters of detected sources- one for probable point-sources and one for probable extended sources. Two separate lists are used mainly because the detection algorithms for point and extended sources are different, and also because the photometry of the two types is done differently.

The linked-lists store a structure for each source that contains, amongst other things, the following entries:



Subsections
Summary of the algorithm Algorithm Point-source detection algorithm Home Index
XMM-Newton SOC/SSC -- 2008-10-22