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| nk |
01/16/2015 12:57PM (Read 1084 times)
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Status: offline
Registered: 01/05/2015
Posts: 1
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Hello
Is there any way in iraf to list pixels in a circular aperture (defined by its radius) ?
(as far as I know, "listpix" in iraf allows to list pixels either for the whole image or for a rectangular area)
Thank you
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| fitz |
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01/16/2015 04:38PM
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Status: offline
Registered: 09/30/2005
Posts: 4040
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As far as I know it can't be done directly, but could be scripted easily. The steps would be as follows:
- Create a mask of the circular aperture desired
- Apply the mask to the image, setting pixels outside the mask to some known constant
- Run LISTPIX on the entire image but filter out the known constant
For example
PHP Formatted Code
cl > type expr .dat
circle (256.,256.,10.) ? 1 : 0
cl > mskregions expr .dat mask .pl dev $pix
cl > imexpr "(a ? b : 99999)" new.fits a =mask .pl b =dev $pix
cl > listpix new.fits | match 99999 STDIN stop +
This should list only the pixels in a 10 pixel radius around (256,256) of the dev$pix image.
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listing pixels in a circular aperture
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