An Efficient Designing Method of Spectral Distribution of Illuminant for the Enhancement of Color Discrimination

摘要

In this study, we propose a method for designing an illuminantrnfor supporting color discrimination with maintaining the arbitraryrnilluminant color. It was applied to the problem of foreignrnsubstances detection in blueberry jam because it is especially difficultrnand essential for quality assurance. To obtain the optimalrnilluminant, a spectral dataset of metameric illuminants was constructedrnand a combination of the metameric illuminants with arngiven chromaticity was derived to maximize the color differencesrnbetween the jam and foreign substances (leaf, branch, and stone).rnA color appearance model (CIECAM02) was used to evaluate difficultyrnof the substance discrimination. The designed illuminantrnwas implemented using a synthesized spectral light source, whichrnclearly showed that the color discrimination of jam and foreignrnsubstances was enhanced. The application field for this techniquernis not limited to foreign substance detection in blueberry jam becausernit could also be applied to quality control processes of otherrnindustrial products, medical imaging, and so on.