Estimation of Spectral Distribution of Scene Illumination from a Single Image

摘要

This article proposes an illuminant estimation algorithm that estimate the spectral power distribution of an incident light source from a single image. The proposed illumination recovery procedure has two phases. First, the surface spectral reflectances are recovered. In this case, the surface spectral reflectances recovered are limited to the maximum achromatic region (MAR) which is the most achromatic and highly bright region of an image, after applying intermediate color constancy process using a modified gray-world algorithm. Next, the surface reflectances of the maximum achromatic region are estimated using the prin- cipal component analysis method along with a set of given Munsell samples.