Comparing experiments of digital photography visiometer

摘要

Abstract: This paper reports a digital photography visiometer (DPV), an automatic digital photography visibility system, that can directly measure and monitor horizontal visibility during daytime through digital shooting. After shooting a scene of given black object and background via its CCD digital camera, the system can capture and transfer photographic images in the camera to a computer, as well as process the digital images and calculate the value of visibility. The formulas for calculating visibility with this method and analyzing the effect of non-black object on measured result are also given. And then the comparison of DPV observations with a lidar-visibility measurements and visual observations are carried out. The results show that the average deviation and relative average deviation of visibility acquired by DPV from lidar-visibility measurements are respectively within 0.927 km and 6.68 percent. !5