全天空数字相机观测云量的初步研究

Preliminary Study on Cloud-Cover Using an All-Sky Digital Camera

采用带有鱼眼镜头的数字相机拍摄全天空图像 ,对图像进行处理并分析 ,实现根据图像获取云量的目的。介绍了工作的基本原理和方法并给出初步实验结果。结果表明 ,用目前分析图像所获取的算法计算云量 (与观测员记录相比 ) ,平均误差在1 5%以内 ,结果的准确度受地面能见度影响较大 ,对能见度达 1

By processing and analyzing the images taken by a digital camera with 'fish-eye',we obtain the cloud-cover.The fundamental and method to obtain the cloud-cover are introduced,and the results are given.Compared with the observation,the results have an average error less than 15%.The accuracy is mainly affected by the visibility and the best result will be obtained when the visibility is larger than 15km.