Specular Highlights Detection and Reduction with Multi-Flash Photography

Rogerio FerisRamesh RaskarKar-Han TanMatthew Turk

We present a novel method to reduce the effect of specularitiesin digital images. Our approach relies on a simplemodification of the capture setup: a multi-flash camerais used to take multiple pictures of the scene, each onewith a differently positioned light source. We then formulatethe problem of specular highlights reduction as solvinga Poisson equation on a gradient field obtained fromthe input images. The obtained specular reduced imageis further refined in a matting process with the maximumcomposite of the input images. Experimental results aredemonstrated on real and synthetic images. The entiresetup can be conceivably packaged into a self-containeddevice, no larger than existing digital cameras.

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