Abstract
The results of experimental observation in the field show that the luminance contrast threshold ((epsilon) ) and the color difference threshold ((Delta) (Epsilon) <SUP>*</SUP>) are respectively tending towards the constants of 0.05 and 0.8 U<SUP>*</SUP>V<SUP>*</SUP>W<SUP>*</SUP> unit of color difference when the angular subtense ((theta) ) of the sample is larger than 30 feet. Otherwise, under the condition of small angular subtense, both (epsilon) and (Delta) (Epsilon) <SUP>*</SUP> are the functions of (theta) . For the black-white sample, the visual threshold is equal to the contrast threshold (epsilon) which increases exponentially with the decrease of (theta) . For the color sample, the visual threshold of color difference is determined not only by contrast, but also by chromatic difference. The effect of (theta) on color difference is reflected in the weighted components of U<SUP>*</SUP>, V<SUP>*</SUP>, and W<SUP>*</SUP> in CIE 1964 U<SUP>*</SUP>V<SUP>*</SUP>W<SUP>*</SUP> uniform colorspace. Nine color samples are used to carry out the experiment and calculation. The results are quantitatively described in this paper. These principles can be applied to image generation, especially to the perspective drawing on computers.
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