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Volume: 48 | Article ID: art00008
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Estimation of Chromatic Characteristics of Scene Illumination in an Image by Surface Recovery from the Highlight Region
  DOI :  10.2352/J.ImagingSci.Technol.2004.48.1.art00008  Published OnlineJanuary 2004
Abstract

This article proposes an illuminant estimation algorithm that estimates the spectral power distribution of an incident light source using its chromaticity determined based on the perceived illumination and highlight region. The proposed algorithm is composed of three steps. First, the illuminant chromaticity of the global incident light is estimated using a hybrid method that combines the perceived illumination and highlight region. Second, the surface spectral reflectance is then recovered from the image after decoupling the global incident illuminant for each channel. The surface spectral reflectance calculation is limited to the MAR (maximum achromatic region), which is the most achromatic and brightest region in the image, and estimated using the PCA (principal component analysis) method along with a set of given Munsell samples. Third, the closest colors are selected from a spectral database composed of reflected-lights generated by the given Munsell samples and a set of illuminants. Finally, the illuminant of the image is calculated using the average spectral distributions of the reflected-lights selected for the MAR region and its average surface reflectance. Experimental results confirmed the accuracy of the estimates produced by the proposed method for various illuminants.

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Yun-Tae Kim, Yeong-Ho Ha, Cheol-Hee Lee, Jeong-Yeop Kim, "Estimation of Chromatic Characteristics of Scene Illumination in an Image by Surface Recovery from the Highlight Regionin Journal of Imaging Science and Technology,  2004,  pp 28 - 36,  https://doi.org/10.2352/J.ImagingSci.Technol.2004.48.1.art00008

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