A Large Image Database for Color Constancy
Ciurea, F. and Funt,B., "A Large Image Database for Color Constancy
Proceedings of the Eleventh Color Imaging Conference, Scottsdale, Nov.
We present a study on various statistics relevant to research on color
constancy. Many of these analyses could not have been done before
simply because a large database for color constancy was not available.
Our image database consists of approximately 11,000 images in which the
RGB color of the ambient illuminant in each scene is measured. To build
such a large database we used a novel set-up consisting of a digital
video camera with a neutral gray sphere attached to the camera so that
the sphere always appears in the field of view. Using a gray sphere
instead of the standard gray card facilitates measurement of the
variation in illumination as a function of incident angle. The study
focuses on the analysis of the distribution of various illuminants in
the natural scenes and the correlation between the rg-chromaticity of
colors recorded by the camera and the rg-chromaticity of the ambient
illuminant. We also investigate the possibility of improving the
performance of the naïve Gray World algorithm by considering a
sequence of consecutive frames instead of a single image. The set of
images is publicly available and can also be used as a database for
testing color constancy algorithms.
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