Previous: De Valois & De Valois's color model Up: Color Models
In [Valberg et al. 1986], the authors investigate the relationship between a
psychophysical color space they have defined in earlier work and the
responses of color-sensitive cells in the Macaque LGN. They propose that a
combination of the responses of various types of spectrally opponent cells
of the Macaque LGN may be related to the equidistant color space they
defined, using their SVF color difference formula. They mathematically
simulate the responses of some cell types as linear combinations of
hyperbolic response functions of cone outputs, and compute the coordinates
of equidistant points in the Munsell and the OSA-UCS color spaces. They
conclude that neural correlates to elementary hues must probably be sought
in the visual cortex, not the LGN. In other words, some kind of
second-stage processing is necessary for the LGN cell responses to be
turned into something that can explain elementary hue sensations (red,
green, yellow, and blue). The color model I present in
Chapter can be thought of as such a second-stage
model. Valberg et al.'s models of LGN cell responses are not used for
computer vision work. Their work examines some properties of these
responses in isolation, while my work attempts to construct a complete
color space based on the responses, usable for computer vision work.