[News] sub window statistics

[Oliver-Mark Cordes]

Hi!

>From the previous mails I think that somebody are concerned that smaller 
subwindows lead to poor statistics in the case of science frames when 
stars are laying in this fields. To avoid stars in whatever sized 
subwindow you can compute the mode of the subwindow/ccd which gives you 
the "mean" value of the background which only is important to characterize 
the image. We are doing this in Bonn in our pipeline. For this case the 
mode can't be determined  by only doing some straight statistics, you have 
to do some fitting which costs time. So a  smaller number of windows, e.g. 
9 or 16 would be sufficient.

Cheers,
 	Oliver





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  Dr. Oliver-M. Cordes       E-Mail:   ocordes at astro.uni-bonn.de
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