A low-cost stereo-fisheye camera sensor for daylighting and glare control

Abstract

This study presents the development of a window-attached, low-cost fisheye-stereo camera sensor system for reliable daylighting controls in buildings. The stereovision sensor composed of two cameras can measure 3-D position and luminance of any exterior bright sources after photometric and geometric calibration. Also, by applying a neutral density sensor on one of the cameras and substituting the overflown pixels of the luminance map, a complete luminance map with a wide dynamic range can be retrieved. The new sensor exhibited promising results in validation of 3-D positioning and luminance acquisition, and can be used for real-time glare source detection, location and intensity measurements.