[AstroPy] Centering saturated images

Russell Owen rowen at uw.edu
Tue Jul 30 10:30:34 EDT 2013


An implementation of centroiding by finding the point of maximum symmetry is available here: 
<http://www.astro.washington.edu/users/rowen/PyGuide/Manual.html>. Be sure to mask out saturated pixels.

-- Russell

On Jul 30, 2013, at 5:54 AM, Ian Crossfield <ianc at mpia-hd.mpg.de> wrote:

> Maria,
> 
> A few ideas:
> --One possibility might be to use a "least-asymmetry" centering approach 
> after masking out the saturated pixels (described, at least briefly, in 
> http://arxiv.org/abs/1010.4591).
> --If your sources are bright enough to show diffraction spikes, these 
> should go through the PSF center and you may be able to calculate a 
> centroid from this.
> 
> Good luck,
> -Ian Crossfield
> 
> 
> On 7/30/13 2:19 PM, Maria de Juan Ovelar wrote:
>> Dear AstroPy-ers,
>> 
>> I am a PhD student working on imaging polarimetry.
>> Sorry if this is a too basic question for the mailing list but I would like to know what is, in your opinion, the best way to center images that have the central ~20 pixels saturated and if there are tools in python that can help wit this specific task.
>> Me and another student were playing a bit with fitting a moffat profile (with saturated pixels masked) but it seems that it is not accurate enough.
>> Any ideas? would a cross-correlation work better? and do the cross-correlation work with saturated pixels masked?
>> 
>> Thank you very much!
>> Maria
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> 
> 
> -- 
> Ian Crossfield
> http://www.mpia-hd.mpg.de/homes/ianc/
> Max-Planck-Institut für Astronomie
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> 
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