prtools.zernike_remove#

zernike_remove(opd, mask, modes, order='noll', rho=None, theta=None, legacy=False)[source]#

Fit and remove a Zernike basis set from an OPD.

Parameters:

opd (array_like) – OPD to fit.
mask (array_like) – Binary mask defining the extent to compute the Zernike basis over.
modes (array_like) – List of modes to remove.
order ({'noll', 'fringe', 'ansi'}, optional) – Zernike ordering scheme. Default is ‘noll’.
rho (array_like, optional) – Radial coordinates of the mask array. rho should be 0 at the origin and 1 at the edge of the circle.
theta (array_like, optional) – Angular coordinates of the mask array in radians.
legacy (bool, optional) – If True, reproduce the Zernike convention of prtools 2.0.2 and earlier. Default is False. See the warning below for details.

Return type:

ndarray

Warning

prtools 2.0.2 and earlier computed Zernike polynomials in a coordinate system mirrored top-to-bottom (y -> -y). This results in modes with negative azimuthal order (sine terms: y tilt, 45 degree astigmatism, y coma, …) having a flipped sign. Modes with zero or positive azimuthal order are unaffected. The zernike_coeff_legacy() function converts between current and legacy conventions.