VI (visibility index) measurement using image processing - a study of multipurpose usage of in-tunnel CCTV images

摘要

This study investigates multipurpose usage of CCTV images inside and outside highway tunnels by applying image processing technology in order to collect useful road management information, and to this end goal, collects, analyzes, and evaluates image data for each purpose. We recorded images of an experimental in-tunnel CCTV in Ipponmatsu tunnel of Nagano expressway, and analyzed and evaluated the results of image-processing for each purpose. For VI (Visibility Index) measurement, we calculated VI values by image processing based on collected images, and analyzed their measurement accuracy and flow of smoke.