colour.contrast.maximum_angular_size_Barten1999¶
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colour.contrast.
maximum_angular_size_Barten1999
(u, X_0=60, X_max=12, N_max=15)[source]¶ Returns the maximum angular size \(X\) of the object considered using Barten (1999) method.
Parameters: - u (numeric) – Spatial frequency \(u\), the cycles per degree.
- X_0 (numeric or array_like, optional) – Angular size \(X_0\) in degrees of the object in the x direction.
- X_max (numeric or array_like, optional) – Maximum angular size \(X_{max}\) in degrees of the integration area in the x direction.
- N_max (numeric or array_like, optional) – 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: numeric or ndarray
References
[Bar99], [Bar03], [CKM+04], [InternationalTUnion15c],
Examples
>>> maximum_angular_size_Barten1999(4) # doctest: +ELLIPSIS 3.5729480...