colour.contrast.pupil_diameter_Barten1999

colour.contrast.pupil_diameter_Barten1999(L: ArrayLike, X_0: ArrayLike = 60, Y_0: TypeAliasForwardRef('ArrayLike') | None = None) → NDArrayFloat

Compute the pupil diameter for the specified luminance and object or stimulus angular size using the Barten (1999) method.

Parameters:

• L (ArrayLike) – Average luminance \(L\) in \(cd/m^2\).

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

• Y_0 (TypeAliasForwardRef('ArrayLike') | None) – Angular size of the object \(Y_0\) in degrees in the y direction.

Returns:

Pupil diameter.

Return type:

numpy.ndarray

References

[Bar99], [Bar03], [CKMW04], [InternationalTUnion15c], [WY12]

Notes

• The Log function is using base 10 as indicated by [WY12].

Examples

>>> pupil_diameter_Barten1999(100, 60, 60)
2.7931307...