colour.contrast.optical_MTF_Barten1999

colour.contrast.optical_MTF_Barten1999(u, sigma=0.01)[source]

Returns the optical modulation transfer function (MTF) \(M_{opt}\) of the eye using Barten (1999) method.

Parameters:
  • u (numeric or array_like) – Spatial frequency \(u\), the cycles per degree.
  • sigma (numeric or array_like, optional) – Standard deviation \(\sigma\) of the line-spread function resulting from the convolution of the different elements of the convolution process.
Returns:

Optical modulation transfer function (MTF) \(M_{opt}\) of the eye.

Return type:

numeric or array_like

References

[Barten1999], [Barten2003], [Cowan2004], [InternationalTelecommunicationUnion2015],

Examples

>>> optical_MTF_Barten1999(4, 0.01)  # doctest: +ELLIPSIS
0.9689107...