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<p>—We present a methodology for calibrating multiple light source locations in 3D from images. The procedure involves the use of a novel calibration object that consists of three spheres at known relative positions. The process uses intensity images to find the positions of the light sources. We conducted experiments to locate light sources in 51 different positions in a laboratory setting. Our data shows that the vector from a point in the scene to a light source can be measured to within <tmath>$2.7 \pm .4 ^{\circ }$</tmath> at <tmath>$ \alpha =.05 $</tmath> (6 percent relative) of its true direction and within <tmath>$0.13 \pm .02 $</tmath> m at <tmath>$ \alpha =.05 $</tmath> (9 percent relative) of its true magnitude compared to empirically measured ground truth. Finally, we demonstrate how light source information is used for color correction.</p>

D. Goldgof, M. Powell and S. Sarkar, "A Simple Strategy for Calibrating the Geometry of Light Sources," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 23, no. , pp. 1022-1027, 2001.
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