For some sets of surfaces, the spatial ratios of cone-photoreceptor excitations produced by
light reflected from pairs of surfaces are almost invariant under illuminant changes. These …

Quantitative measurements of perceptual colour constancy show that human observers
have a limited and variable ability to match coloured surfaces in scenes illuminated by …

We gathered hyperspectral images of natural, foliage-dominated scenes and converted
them to human cone quantal catches to characterize the second-order redundancy present …

The spatial filtering applied by the human visual system appears to be low pass for
chromatic stimuli and band pass for luminance stimuli. Here we explore whether this …

Ratios of excitations in each cone–photoreceptor class produced by light reflected from pairs
of surfaces in a scene are almost invariant under natural illuminant changes. The stability of …

The human visual system encodes the chromatic signals conveyed by the three types of
retinal cone photoreceptors in an opponent fashion. This opponency is thought to reduce …

In natural complex environments, the elevation of the sun and the presence of occluding
objects and mutual reflections cause variations in the spectral composition of the local …

The evolution of visual pigment spectral sensitivities is probably influenced by the
reflectance spectra of surfaces in the animal's environment. These reflectances, we …

A system of photometry and colorimetry is proposed that is based upon cone action spectra.
Instead of X, Y, Z tristimulus values, the new system divides the visual stimulus into L, M, and …

The reflectance spectra of natural and man‐made surfaces are highly constrained. Statistical
analyses have been conducted that confirm that the surface reflectance spectra form a set of …