colour.contrast.maximum_angular_size_Barten1999#

colour.contrast.maximum_angular_size_Barten1999(u: ArrayLike, X_0: ArrayLike = 60, X_max: ArrayLike = 12, N_max: ArrayLike = 15) → NDArrayFloat[source]#

Return the maximum angular size \(X\) of the object considered using Barten (1999) method.

Parameters:

  • u (ArrayLike) – Spatial frequency \(u\), the cycles per degree.

  • X_0 (ArrayLike) – Angular size \(X_0\) in degrees of the object in the x direction.

  • X_max (ArrayLike) – Maximum angular size \(X_{max}\) in degrees of the integration area in the x direction.

  • N_max (ArrayLike) – Maximum number of cycles \(N_{max}\) over which the eye can integrate the information.

Returns:

Maximum angular size \(X\) of the object considered.

Return type:

numpy.ndarray

References

[Bar99], [Bar03], [CKMW04], [InternationalTUnion15c],

Examples

>>> maximum_angular_size_Barten1999(4)  
3.5729480...