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

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11582/25329
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