measure_ee¶
-
poppy.
measure_ee
(HDUlist_or_filename=None, ext=0, center=None, binsize=None, normalize='None')[source]¶ measure encircled energy vs radius and return as an interpolator
Returns a function object which when called returns the Encircled Energy inside a given radius, for any arbitrary desired radius smaller than the image size.
- HDUlist_or_filename : string
- Either a fits.HDUList object or a filename of a FITS file on disk
- ext : int
- Extension in that FITS file
- center : tuple of floats
- Coordinates (x,y) of PSF center. Default is image center.
- binsize:
- size of step for profile. Default is pixel size.
- normalize : string
- set to ‘peak’ to normalize peak intensity =1, or to ‘total’ to normalize total flux=1. Default is no normalization (i.e. retain whatever normalization was used in computing the PSF itself)
- encircled_energy: function
- A function which will return the encircled energy interpolated to any desired radius.
>>> ee = measure_ee("someimage.fits") >>> print "The EE at 0.5 arcsec is ", ee(0.5)