Towards Image-Based Measurement of Perceived Lightness applied to Paintings Lighting.

A relevant problem in the evaluation of illumination conditions on ancient paintings and frescos is the needing of some kind of measure of the perceived light not only from a metrological point of view, but also considering the visual perception of the observers. In this paper, we propose a comparison between different lightness definitions applied to lighting measurements acquired by Imaging Luminance Measurement Device (ILMD) on paintings illuminated by daylight, in order to setup a more comprehensive system to evaluate the effective quality of the illumination of museums and art galleries. We actually considered some well-known lightness definitions working on the global image, but we want to investigate local adaptation algorithms