Study on Evaluation Method of Solar Shading for Blind Control Based on Luminance Images

Abstract

For the saving energy of the illumination, it is necessary to use day light effectively. In general, office has only side window to get day light and Venetian blinds are installed in the window for solar shading. In the automatic blind control system installed at the large scale building, slats of blind are uniformly controlled by illuminance censor fixed on the top of the building. We devised technique to detect not only the direct sunlight but also the dazzling borrowed light from adjacency building based on a luminance image provided with a CCD camera for the purpose of the development of the higher precise judgment of solar shading. We built the system which could perform shading immediately at the time of the detection and introduced it into the actual work place. Here, we report a detection method and an experimental data of the precision of the system.