IEEE Trans Image Process - Color constancy for multiple light sources.

Tópicos

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Resumo

Color constancy algorithms are generally based on the simplifying assumption that the spectral distribution of a light source is uniform across scenes. However, in reality, this assumption is often violated due to the presence of multiple light sources. In this paper, we will address more realistic scenarios where the uniform light-source assumption is too restrictive. First, a methodology is proposed to extend existing algorithms by applying color constancy locally to image patches, rather than globally to the entire image. After local (patch-based) illuminant estimation, these estimates are combined into more robust estimations, and a local correction is applied based on a modified diagonal model. Quantitative and qualitative experiments on spectral and real images show that the proposed methodology reduces the influence of two light sources simultaneously present in one scene. If the chromatic difference between these two illuminants is more than 1?, the proposed framework outperforms algorithms based on the uniform light-source assumption (with error-reduction up to approximately 30%). Otherwise, when the chromatic difference is less than 1? and the scene can be considered to contain one (approximately) uniform light source, the performance of the proposed method framework is similar to global color constancy methods.

Resumo Limpo

color constanc algorithm general base simplifi assumpt spectral distribut light sourc uniform across scene howev realiti assumpt often violat due presenc multipl light sourc paper will address realist scenario uniform lightsourc assumpt restrict first methodolog propos extend exist algorithm appli color constanc local imag patch rather global entir imag local patchbas illumin estim estim combin robust estim local correct appli base modifi diagon model quantit qualit experi spectral real imag show propos methodolog reduc influenc two light sourc simultan present one scene chromat differ two illumin propos framework outperform algorithm base uniform lightsourc assumpt errorreduct approxim otherwis chromat differ less scene can consid contain one approxim uniform light sourc perform propos method framework similar global color constanc method

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