openpiv_cxx.interpolate.whittaker2D

openpiv_cxx.interpolate.whittaker2D(image, yi, xi, radius=3, keep_dtype=False)

Whittaker-Shanon (sinc) mapping

Perform Whittaker-Shannon mapping over a 2D regular mesh.

Parameters:

  • image (ndarray) – A two dimensionional array containing grey levels of an image.

  • xi (ndarray) – The x/y-coordinates at which to evaluate the interpolated values of shape (rows, cols).

  • yi (ndarray) – The x/y-coordinates at which to evaluate the interpolated values of shape (rows, cols).

  • radius (int) – The radius of the Whittaker interpolation kernel. Optimal radii is 3 and 5.

  • keep_dtype (bool) – Whether to cast the output to the original dtype or not.

Returns:

img_deform – The interpolated image frame.

Return type:

ndarray

References

[1] Wikipedia contributors. (2022, March 18). Whittaker-Shannon

interpolation formula. In Wikipedia, The Free Encyclopedia. Retrieved June 30, 2022, from https://en.wikipedia.org/w/index.php?title=Whittaker%E2%80%93Shannon_interpolation_formula&oldid=1077909297