Camera based evaluation of photometric compensation methods on multi-projector displays

An important problem in achieving seamless multi-projector displays is the photometric (luminance) variation across the display. Currently, evaluation of the improvement in the quality of the imagery achieved by applying different photometric correction methods and a comparison between them is done by a subjective human user. In this paper, we present a camera-based method for relative evaluation of the luminance properties of the imagery on multi-projector displays, both before correction and after correction using different compensation techniques. To the best of our knowledge, this is the first camera-based method designed to evaluate the different photometric correction methods on a multi-projector display. We show that using our simple and automatic evaluation scheme the optimal photometric compensation parameter for a multi-projector display can be identified, which is not possible by subjective evaluation.