基于双光源图像特征的夜间能见度观测方法研究  

Research on Night Visibility Estimation Method Based on Image Features of Dual Light Sources

作　　者：戴庞达[1] 张玉钧[1] 鲁昌华[2] 周毅[1] 刘晶[1] 肖雪[1] 刘文清[1] 王京丽[3] 

机构地区：[1]中国科学院安徽光学精密机械研究所,中国科学院环境光学与技术重点实验室,安徽合肥230031 [2]合肥工业大学,安徽合肥230009 [3]中国气象局北京城市气象研究所,北京100089

出　　处：《光谱学与光谱分析》2014年第1期1-5,共5页Spectroscopy and Spectral Analysis

基　　金：公益行业(气象)科研专项(GYHY201106047)资助

摘　　要：以视觉方法观测能见度为研究核心,提出了基于双光源图像特征的夜间能见度观测方法,完成在各种不同天气情况下,对能见度的大范围、高精度、高鲁棒观测。首先分析多次散射条件下,光源图像亮度变化与大气消光之间的关系,得出反演能见度的基本模型,接着,研究了准确获取与能见度相关的光源图像特征提取算法,并提出了一种能消除光源波动的双光源能见度计算方法。最后,使用基于双光源图像特征的能见度观测系统在不同气象条件下进行实验,结果表明,在采用35m基线长度,设定观测上限为15 000m时,观测误差均小于20%,能够满足气象与交通部门的要求。Haze, rain and snow bring a lot of inconvenience in our daily life, especially produce serious potential safety hazard for night transport. In the present paper the authors propose the vision-based dual light sources visibility method to estimate night visibility. This method is significantly advantaged with wide range, high precision and low cost, and has a good robustness in many kinds of weather conditions. Firstly, the authors give the basic visibility estimation model under the atmosphere multiple scattering theory. Secondly, the authors propose the dual light sources method to remove the luminance fluctuations of light sources and the atmosphere light effect, and formulize the algorithm to accurately gain information of light sources from the dual light sources image. At last, the authors design the dual light sources system and conduct a long time experiments under various atmosphere conditions. The experiments show that, with the baseline of 35 m, the visibility range is up to 15 000 m, and rela- tive error is below 20%. This method and system can satisfy the demand of meteorological department and transport agency.

关 键 词：夜间能见度 消光系数 双光源 视觉方法 光源图像特征 

分 类 号：TN911.73[电子电信—通信与信息系统]