Enhancing color representation for anomalous trichromats on CRT monitors

Cathode my tube (CRT) displays are probably the most widely used color imag ing devices, and include TV sets and computer monitors. Although the CRT co lor representations are adequate for people with normal color vision, color -deficient users would be expected to experience problems of color identifi cation and discrimination with CRT images, just as they do with "real life" objects. A theoretical method is proposed for combining specially designed filters with the unique spectral emission characteristics of the CRT phosp hors for enabling certain types of color anomalous trichromats to see the c olor of the displayed images as a person with normal color vision would see the CRT. Given the spectral emission curves of the CRT phosphors and the s ensitivity curve of the color-deficient eye, the relative sensation levels of the L, M, and S cones can be calculated. Applying an optimized color fil ter and a neutral adaptation background illumination, the L, M, and S sensa tion ratios can be modified to achieve the normal values. A numerical metho d is presented to design the filter transmission curve and to verify the L, M, and S cone sensation ratios. (C) 2000 John Wiley Bi Sons, Inc.