Daylight spectrum model under weather conditions from clear sky to cloudy

This paper proposes a daylight spectrum model under weather conditions from clear sky to cloudy. Various color constancy theories have been proposed to estimate the spectral properties of the illumination and objects in a scene from color information obtained by a camera. A finite dimensional linear model is used to model the spectral properties. When the range of wavelength obtained by a hyperspectral camera is wide, e.g. 300nm-1000nm, the wavelength range of the conventional basis vectors of daylight (300nm-830nm) is insufficient. Bird Model is a daylight spectrum model with wide range of wavelength from 300nm to 4000nm. However, it is not practical since it can be applied only under clear sky. In this study, this restriction in the weather is solved by taking the behavior of daylight passing through clouds into consideration. Experimental results show that the proposed model is promising.