Q {colourvision}R Documentation

Total photon capture

Description

Total photoreceptor photon capture for a given irradiance, reflectance and photoreceptor sensitivity curve. This function is used internally in colour vision models.

Usage

Q(R,I,C,interpolate,nm)

Arguments

R

Reflectance of observed object. A data frame with two columns only: first column corresponding to wavelength values and second column with reflectance values.

I

Irradiance spectrum. A data frame with two columns only: first column corresponding to wavelength values and second column with irradiance values. Irradiance values must be in quantum flux units.

C

Photoreceptor sensitivity curve. A data frame with two columns only: first column corresponding to wavelength values and second column with photoreceptor absorbance values.

interpolate

Whether data files should be interpolated before further calculations. See approx.

nm

A sequence of numeric values specifying where interpolation is to take place. See approx.

Value

Gives the total photoreceptor photon capture.

Author(s)

Felipe M. Gawryszewski f.gawry@gmail.com

References

Backhaus, W., and R. Menzel. 1987. Color distance derived from a receptor model of color vision in the honeybee. Biological Cybernetics 55:321-331.

Chittka, L. 1992. The colour hexagon: a chromaticity diagram based on photoreceptor excitations as a generalized representation of colour opponency. J Comp Physiol A 170:533-543.

Endler, J. A., and P. Mielke. 2005. Comparing entire colour patterns as birds see them. Biol J Linn Soc 86:405-431.

Vorobyev, M., and D. Osorio. 1998. Receptor noise as a determinant of colour thresholds. Proceedings of the Royal Society B 265:351-358.

See Also

Qr, CTTKmodel, EMmodel, RNLmodel, RNLthres,GENmodel


[Package colourvision version 2.0.3 Index]