The experimental data consists of (basically) the same scene, under three different conditions of illumination :
Three different scenes are lighted by the test illuminants, having different overall color balances (and accidentally, some specularities.) These are labeled by the color gamut present in the scene: all colors, little blue, and little red.
The video camera used was a Sony DXC-3000, which produced a composite video signal. The video was then digitized using a Digital Equipment Co. AV321 video card.
One problem with this test set is that the different illuminations were not co-located, causing shadows to be located in different positions. Another is that the same camera (and therefore sensor responses) was used throughout.
Two dimensional histograms of the test images are available: chromaticity and Red vs. Blue. In addition, the luminance edges, which are used by some Color Constancy algorithms, are identified.
|Illuminant A||Illuminant B||Illuminant C|