# Contrast Sensitivity¶

## Contrast Sensitivity¶

colour

 contrast_sensitivity_function([method]) Returns the contrast sensitivity $$S$$ of the human eye according to the contrast sensitivity function (CSF) described by given method. CONTRAST_SENSITIVITY_METHODS Supported contrast sensitivity methods.

## Barten (1999) Contrast Sensitivity Function¶

colour.contrast

 Returns the contrast sensitivity $$S$$ of the human eye according to the contrast sensitivity function (CSF) described by Barten (1999).

Ancillary Objects

colour.contrast

 optical_MTF_Barten1999(u[, sigma]) Returns the optical modulation transfer function (MTF) $$M_{opt}$$ of the eye using Barten (1999) method. pupil_diameter_Barten1999(L[, X_0, Y_0]) Returns the pupil diameter for given luminance and object or stimulus angular size using Barten (1999) method. sigma_Barten1999([sigma_0, C_ab, d]) Returns the standard deviation $$\sigma$$ of the line-spread function resulting from the convolution of the different elements of the convolution process using Barten (1999) method. retinal_illuminance_Barten1999(L[, d, …]) Returns the retinal illuminance $$E$$ in Trolands for given average luminance $$L$$ and pupil diameter $$d$$ using Barten (1999) method. maximum_angular_size_Barten1999(u[, X_0, …]) Returns the maximum angular size $$X$$ of the object considered using Barten (1999) method.