astrowisp.fake_image.piecewise_bicubic_psf module

Class Inheritance Diagram

Defines the PiecewiseBicubicPSF class.

class astrowisp.fake_image.piecewise_bicubic_psf.PiecewiseBicubicPSF(boundaries, psf_parameters)

Bases: PiecewisePSF

A piecewise PSF class where the PSF over each piece is a bi-cubic function.

__init__(boundaries, psf_parameters)

Initialize a PiecewiseBicubicPSF with the given shape.

Parameters:

• boundaries – Dictionary (keys x and y) listing the cell horizontal/vertical boundaries.

• psf_parameters –

  A dictionary of 2x2 structures with keys:

  • values: The values of the piece bi-cubic polynomial af the

    intersections of the horizontal & vertical boundaries.

  • d_dx: The x derivatives of the piece bi-cubic polynomial af

    the intersections of the horizontal & vertical boundaries.

  • d_dy: The y derivatives of the piece bi-cubic polynomial af

    the intersections of the horizontal & vertical boundaries.

  • d2_dxdy: The x,y cross-derivatives of the piece bi-cubic

    polynomial af the intersections of the horizontal & vertical boundaries.

Returns:

None

static _create_piece(boundaries, psf_parameters)

Return a BicubicPSFPiece satisfying the given constraints.

Parameters:

__init__ (The same as the arguments of)

Returns:

A BicubicPSFPiece instance with parameters as specified by psf_parameters.

Return type:

psf_piece