measure_radial¶

poppy.measure_radial(hdulist_or_filename=None, ext=0, center=None, binsize=None)[source]¶

measure azimuthally averaged radial profile of a PSF.

Returns a function object which when called returns the mean value at a given radius.

Parameters:

hdulist_or_filenamestring: what it sounds like.
extint: Extension in FITS file
centertuple of floats: Coordinates (x,y) of PSF center. Default is image center.
binsize:: size of step for profile. Default is pixel size.

Returns:

radial_profile: function: A function which will return the mean PSF value at any desired radius.

Examples

>>> rp = measure_radial("someimage.fits")  
>>> radius = np.linspace(0, 5.0, 100)
>>> plt.plot(radius, rp(radius), label="PSF")  