Evaluation of Smoothness in Color Gradation on Multiprimary Display

Author： Takiue Junya Sugino Shingo Murakami Yuri Obi Takashi Yamaguchi Masahiro Ohyama Nagaaki

Publisher： Society for Imaging Science and Technology

ISSN： 2166-9635

Source： Color and Imaging Conference, Vol.2004, Iss.1, 2004-01, pp. : 257-264

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Multiprimary displays, which are developed recently, enable to reproduce expanded color gamut using more than three primary colors. To reproduce an image using the multiprimary display, a color conversion algorithm is needed to generate multiprimary control signals from colorimetric tristimulus values. Several color conversion algorithms have been proposed, which give a unique set of multiprimary control signals to reproduce a specified color. When a smooth gradation is displayed, however, we sometimes perceive a contour-like artifact, which is called “pseudo contour.” The pseudo contour affects the image quality of multiprimary displays especially when smooth tonal change is reproduced. The pseudo contour is caused by the device profile error and the difference of the color matching functions of actual observers from the standard observer, but its appearance depends on the color conversion algorithms. Therefore, we propose a method to predict the appearance of the pseudo contour and evaluate the color conversion algorithms proposed before. The experimental results demonstrate that the predicted appearance of the pseudo contour is in good agreement with the visual observation.