In order to avoid luminance flicker at equal luminance of two alternating colored stimuli de Lange found that a phase shift of the stimuli with respect to each other has to be introduced.
This compensation for the phase shift occurring in the retina–cortex system has been measured for a large number of wavelength combinations at a retinal illuminance of 2 trolands and a 2° field. The phase angles are approximately additive.
An analysis is given in terms of more basic phase shifts between the red and green systems according to the Young–Helmholtz theory.
A fixed phase-shift-vs-frequency relationship between these systems explains the phase shifts measured, although second-order nonlinear effects cause small distortions of this simple model.
© 1964 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
Tapas K. Sen
J. Opt. Soc. Am. 54(3) 386-393 (1964)
H. de Lange Dzn
J. Opt. Soc. Am. 48(11) 784-789 (1958)
Gerard J. C. van der Horst
J. Opt. Soc. Am. 59(9) 1213-1217 (1969)