Abstract— A color‐conversion method, which converts an XYZ tristimulus value to a set of display signals for a multi‐primary display, has been developed. It is necessary for a display‐device driver in a color‐management system to select an optimal set of display signals that presents a given colorimetric value on a display screen. A multi‐primary display, which has more than four primaries, has more than two sets of display signals that generate the same colorimetric value theoretically. A display‐device driver, therefore, has to be designed according to a certain rule in order to choose a unique set of display signals for one colorimetric value only. To meet the requirement, a linear interpolation method, which uses three points on an equi‐luminance plane in XYZ tristimulus value space, has been developed. The developed method assigns three points on an equi‐luminance plane in XYZ tristimulus value space to ensure smoothness of a continuous gradation of display signals. The colorimetric accuracy of the developed method was evaluated with a six‐primary DLP™ projector. Colorimetric error in CIELAB space between the targets and reproductions is about 0.8 on average and 2.9 at maximum.
We propose a color video generation method for spatio-temporal high-resolution video imaging in dark conditions. The proposed method consists of two steps. First, RGB-separated video sequences with different spatio-temporal resolution sets are captured to increase the amount of captured light. Second, a high spatiotemporal resolution color video is reconstructed from those input video sequences in the regularization framework. We show the advantages of our method using a prototype camera system and simulation results.
The validity of color name matching in analyzing gamut mapping algorithms is described in this paper. The performances of three types of gamut mapping algorithms (cusp scaling, clipping, and categorical weighting) are evaluated in a psychophysical experiment from the viewpoint of color name matching. Based on this evaluation, we have found that cusp-scaling algorithm is capable of controlling lightness reasonably well, compensating for a decrease in chroma caused by the difference in the size of device gamut between a source and a destination device. Ranking of reproducible performance by the three gamut mapping algorithms in the psychophysical experiment is arrived at on the basis of color name matching.
Color-naming modelA color-naming model was introduced to obtain a color name for any arbitrary color. The following color names were used in this paper: (1) achromatic, (2) red, (3) brown, (4) pink, (5) orange, (6) yellow, (7) green, (8) blue, and (9) purple. These color names were selected from 11 categorical basic color names. 2 In this paper, white, black, and gray are referred to as the achromatic. Matching a given test color to one the nine color names is described by Mahalano-
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