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whitebalPR – Automatic White Balancing (AWB) by Polarized Reflections

In digital photography it is common practice that white

balancing methods utilize the brightest areas of an image to estimate the color of illumination. The resulting estimates do not only depend on the illumination color but strongly on the image content as well, because common methods rely on sufficiently neutral objects within the scene. The Institute of Media and Phototechnology of the Cologne University of Applied Sciences recently developed a new method that automatically gains the illumination color by exact measurements directly from the photographed scene rather than to estimate it. The new measurement procedure uses the polarization of light reflected by body surfaces. It provides a spatially resolved analysis of the illumination of the scene photographed by the image sensor.

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