measure_centroid¶
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poppy.measure_centroid(HDUlist_or_filename=None, ext=0, slice=0, boxsize=20, verbose=False, units='pixels', relativeto='origin', **kwargs)[source]¶ Measure the center of an image via center-of-mass
The centroid method used is the floating-box center of mass algorithm by Jeff Valenti et al., which has been adopted for JWST target acquisition measurements on orbit. See JWST technical reports JWST-STScI-001117 and JWST-STScI-001134 for details.
- 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
- slice : int, optional
- If that extension is a 3D datacube, which slice (plane) of that datacube to use
- boxsize : int
- Half box size for centroid
- relativeto : string
- either ‘origin’ for relative to pixel (0,0) or ‘center’ for relative to image center. Default is ‘origin’
- units : string
- either ‘pixels’ for position in pixels or ‘arcsec’ for arcseconds. Relative to the relativeto parameter point in either case.
- CoM : array_like
- [Y, X] coordinates of center of mass.