^ Fernandez-Maloigne, Christine (2012)."A Spatial Processor Model for Object Colour Perception". The von Kries coefficient law can be expressed by the following equations: The specific amount that this number is reduced by is inversely related to the relative strengths of activation by the energy distribution of the particular light in question. Therefore, if one of the three cones are less stimulated than the others, the sensitivity is proportionally reduced. The law assumes that although the responses of the three cone types (R, G, and B) are affected differently by chromatic adaptation, the spectral sensitivities of each of the three cone mechanisms remains unchanged. There were frequently reported systematic discrepancies between prediction and experiment. (1957), and Macadam rejected his law as being insufficiently accurate. Many researchers, including Eileen Wassof (1959), Burnham et al. While von Kries and the other researchers did not have the means to test out the results of his stated law, others tested out his coefficient law by estimating the eigenvectors of the measured linear transformations. Activation of these cones in different combinations and to different degrees results in the perception of other colors. Helmholtz, along with Thomas Young, proposed the trichromatic theory, or the Young–Helmholtz theory, that stated that the retina contains three types of cones, which respond to light of three different wavelengths, corresponding to red, green, or blue. A German physicist and physician, Helmholtz asserted that “the nervous substance in question is less sensitive to reacting light falling on it than the rest of the retina that was not previously stimulated”. The von Kries coefficient law built upon theories and research done by Hermann von Helmholtz. History Helmholtz and the Young–Helmholtz theory While the law does not provide a precise indication of the correction, it typically provides a reasonable approximation. The von Kries coefficient law compensates for the illumination change using a purely diagonal scaling of the cone absorptions. It is the oldest and most widely used law to quantify color adaptation, and is used widely in the field of vision and chromatic adaptation. The law accounts for the approximate color constancy in the human visual system. The von Kries coefficient law in color adaptation describes the relationship between the illuminant and the human visual system sensitivity.
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