Does melanopsin help to explain color constancy in natural environments?

• Autores: Barrionuevo, Pablo Alejandro; Cao, Dingcai
• Año de publicación: 2019
• Idioma: inglés
• Tipo de recurso: documento de conferencia
• Materia: COLOR CONSTANCY; MELANOPSIN; NATURAL ENVIRONMENT
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

The aim of this work was to assess whether melanopsin excitation could help to achieve a better color constancy in natural environments. Data from hyperspectral natural images and 21 daylight illuminants were used to compute L-, M-, S-cone and melanopsin excitations for each pixel. The geometrical distance in the cone chromaticity diagram [L/(L+M) and S/(L+M)] was computed between daylight illuminants and the reference illuminant (D65) for each pixel in each image. These distances were related to melanopsin excitation. Our analysis showed that to achieve a better color constancy, melanopsin contribution to afferent chromatic pathways depends on the correlated color temperature (CCT) of illuminants. For CCT values related to clear sky conditions, signals in the S/(L+M) axis need a positive melanopsin contribution, and the L/(L+M) axis a negative contribution. Instead, scenes such as those related with dawn and dusk, have worse constancy when melanopsin is considered.
Fil: Barrionuevo, Pablo Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Investigación en Luz, Ambiente y Visión. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Instituto de Investigación en Luz, Ambiente y Visión; Argentina
Fil: Cao, Dingcai. University of Illinois; Estados Unidos
International Colour Association Midterm Meeting
Ciudad Autónoma de Buenos Aries
Argentina
Grupo Argentino del Color