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In this paper, an image-based luminance measurement system(LMS) is proposed to measure the luminance of outdoor signboards. We design the LMS that can improve disadvantages of efficiency of the point-luminance meter and portability of face-luminance meter using the image of DSLR camera and print out the luminance value by using the proposed luminance analysis algorithm in real time. Outdoor signboards have various size and shape, and are also installed on the various place. Luminance of the signboard is influenced by measurement location, angle, color, etc. Therefore, we measure the change of luminance value in accordance with measurement location for accurate luminance measurement and then consider the lumi-nance value according to the measurement distance. We obtain a numerical relation between luminance value and measure-ment location. The proposed LMS is verified through comparative experiment with point-luminance meter.Key Words : Luminance measure system, Outdoor advertisement sign, Image of DSLR camera, Measurement position, Luminance correction algorithm

A Study on the Image-Based Luminance Measurement System Using the Measuring Position