colour.contrast.maximum_angular_size_Barten1999#

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

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

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

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

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

  • N_max (FloatingOrArrayLike) – 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.floating or numpy.ndarray

References

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

Examples

>>> maximum_angular_size_Barten1999(4)  
3.5729480...