Abstract
Wavelength discrimination was measured from 480 to 660 nm using wavelength-modulated square-wave gratings. When adjacent grating bars are matched in brightness, wavelength-difference thresholds in all regions of the spectrum increase with spatial frequency within the range of 2.4–19.9 cycles per degree (cpd). Unlike luminance-modulated gratings, no sign of low-frequency attenuation was found. Wavelength differences alone do not yield good visual acuity. Small brightness mismatches between adjacent grating bars generally improve wavelength discrimination and cause low-frequency attenuation in the wavelength modulation vs spatial-frequency function so that it resembles conventional luminance modulation vs spatial-frequency functions.
© 1970 Optical Society of America
Full Article | PDF ArticleMore Like This
Joel Pokorny and Vivianne C. Smith
J. Opt. Soc. Am. 60(4) 562-569 (1970)
R. L. Hilz, G. Huppmann, and C. R. Cavonius
J. Opt. Soc. Am. 64(6) 763-766 (1974)
Cornells Noorlander, Mathijs J. G. Heuts, and Jan J. Koenderink
J. Opt. Soc. Am. 70(9) 1116-1121 (1980)