25 September 2014 A lighting metric for quantitative evaluation of accent lighting systems
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Accent lighting is critical for artwork and sculpture lighting in museums, and subject lighting for stage, Film and television. The research problem of designing effective lighting in such settings has been revived recently with the rise of light-emitting-diode-based solid state lighting. In this work, we propose an easy-to-apply quantitative measure of the scene's visual quality as perceived by human viewers. We consider a well-accent-lit scene as one which maximizes the information about the scene (in an information-theoretic sense) available to the user. We propose a metric based on the entropy of the distribution of colors, which are extracted from an image of the scene from the viewer's perspective. We demonstrate that optimizing the metric as a function of illumination configuration (i.e., position, orientation, and spectral composition) results in natural, pleasing accent lighting. We use a photorealistic simulation tool to validate the functionality of our proposed approach, showing its successful application to two- and three-dimensional scenes.
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Cyril O. Acholo, Kenneth A. Connor, Richard J. Radke, "A lighting metric for quantitative evaluation of accent lighting systems", Proc. SPIE 9190, Thirteenth International Conference on Solid State Lighting, 91900K (25 September 2014); doi: 10.1117/12.2062190; https://doi.org/10.1117/12.2062190

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