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Thus human color perception is determined by a specific, non-unique linear mapping from the infinite-dimensional Hilbert space H color to the 3-dimensional Euclidean space R 3 color. Technically, the image of the (mathematical) cone over the simplex whose vertices are the spectral colors, by this linear mapping, is also a (mathematical) cone in ...
The identification of human skin bindings has been attempted by examining the pattern of hair follicles, to distinguish human skin from that of other animals typically used for bookbinding, such as calf, sheep, goat, and pig. This is a necessarily subjective test, made harder by the distortions in the process of treating leather for binding.
Primates, as an order of mammals, began to emerge around the beginning of the Paleogene Period. Primates have re-developed trichromatic color vision since that time, by the mechanism of gene duplication , being under unusually high evolutionary pressure to develop color vision better than the mammalian standard.
A uniform color space (UCS) is a color model that seeks to make the color-making attributes perceptually uniform, i.e. identical spatial distance between two colors equals identical amount of perceived color difference. A CAM under a fixed viewing condition results in a UCS; a UCS with a modeling of variable viewing conditions results in a CAM.
The opponent process is a color theory that states that the human visual system interprets information about color by processing signals from photoreceptor cells in an antagonistic manner. The opponent-process theory suggests that there are three opponent channels , each comprising an opposing color pair: red versus green , blue versus yellow ...
Howler monkeys are perhaps the most folivorous of the New World monkeys. Fruits make up a relatively small portion of their diet, [30] and the type of leaves they consume (young, nutritive, digestible, often reddish in color), are best detected by a red-green signal. Field work exploring the dietary preferences of howler monkeys suggest that ...
YUV: as human eyes have lower resolution in their color perception, it is more economic to put more of the bandwidth in encoding Luma. The same principle is used in YCC. In YCC, separating also has the added benefit of removing most of the correlation between the input channels, therefore providing better compression.
Chromatic adaptation is the human visual system’s ability to adjust to changes in illumination in order to preserve the appearance of object colors. It is responsible for the stable appearance of object colors despite the wide variation of light which might be reflected from an object and observed by our eyes.