This is a technical report, that investigate the relation between two models for describing the variation of the colors due to a photmetric change. Abstract: Planckian illuminants and the von Kries diagonal model are commonly assumed by many computer vision algorithms for modeling the color variations between two images of a same scene captured under two different illuminants. In this work we provide a method to estimate a von Kries transform approximating a Planckian illuminant change and we show that the Planckian assumption constraints the von Kries coefficients to belong to a ruled surface depending on physical cues of the lights. Moreover, we provide an approximated parametric representation of such a surface, making evident the dependence of the von Kries transform on the light color temperature and on the intensity.
Von Kries Model Under Planckian Illuminants: An Empirical Analysis
Lecca, Michela;Messelodi, Stefano
2011-01-01
Abstract
This is a technical report, that investigate the relation between two models for describing the variation of the colors due to a photmetric change. Abstract: Planckian illuminants and the von Kries diagonal model are commonly assumed by many computer vision algorithms for modeling the color variations between two images of a same scene captured under two different illuminants. In this work we provide a method to estimate a von Kries transform approximating a Planckian illuminant change and we show that the Planckian assumption constraints the von Kries coefficients to belong to a ruled surface depending on physical cues of the lights. Moreover, we provide an approximated parametric representation of such a surface, making evident the dependence of the von Kries transform on the light color temperature and on the intensity.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
