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Nonlinear Change of the Illuminant

Color Constancy M. Ebner 2007 John Wiley Sons, Ltd [Pg.255]

COMPUTING ANISOTROPIC LOCAL SPACE AVERAGE COLOR [Pg.256]

Figure 12.3 Even a nonlinear change of the illuminant can be considered to be linear provided the area of support is sufficiently small (a). However, in practice, we use quite large areas of support. Otherwise the gray world assumption would not be correct. In this case, the area of support will probably contain nonlinearities and the estimated local space average color will be incorrect (b). Figure 12.3 Even a nonlinear change of the illuminant can be considered to be linear provided the area of support is sufficiently small (a). However, in practice, we use quite large areas of support. Otherwise the gray world assumption would not be correct. In this case, the area of support will probably contain nonlinearities and the estimated local space average color will be incorrect (b).
Figure 12.4 Nonlinear change of the illuminant. The arrow shows the direction of the gradient. The line of constant illumination is perpendicular to the direction of the gradient. Figure 12.4 Nonlinear change of the illuminant. The arrow shows the direction of the gradient. The line of constant illumination is perpendicular to the direction of the gradient.
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