Experimental method of judging suitability of simulation model for dichromatic color appearance

摘要

There are color vision barrier-free conversion algorithms that are used to improve the contrast in images for dichromats. The algorithms focus on whether dichromats can distinguish a combination of colors and often use a simulation model of color appearance for dichromats. To adjust the algorithms for individual dichromats, it is necessary to investigate whether the simulation model used is suitable for them in the vicinity of the color discrimination threshold Theta; however, there have been few such studies. In this paper, we propose a method of judging the suitability of a simulation model for dichromatic color appearance in the vicinity of Theta using psychophysical measurements. In our method, gradually changing colors in the RGB color space are presented (Presentation A) to a dichromat and Theta(A) is obtained. Moreover, colors that are simulated by a target model are also presented (Presentation B) to the dichromat and Theta(B) is obtained. The suitability of the simulation model for the dirchromat is quantitatively judged by comparing Theta(A) and Theta(B) using statistical methods. An application example of the proposed method is also described to concretely show the procedure of the method.