[1] [1] Zeng Shu’er, Wang Gaili. Observation and instrument of visibility ［J］. Quarterly Journal of Applied Meteorlogy, 1999, 10(2): 207-212(in Chinese).

[2] [2] Lin Ye. Atmospheric Sounding ［M］. Beijing: China Meteorological Press, 1995: 93-97(in Chinese).

[3] [3] Wang Jingli, Cheng Conglan, Xu Xiaofeng. Comparative experiment of digital photography visiometer system ［J］. Meteorological Science and Technology, 2002, 30: 353-357(in Chinese).

[4] [4] Steffens C. Measurement of visibility by photographic photometry ［J］. Industrial Engineering Chemistry, 1949, 41(11): 2396-2399.

[5] [5] Lv Weitao, Tao Shanchang, Liu Yifeng, et al. Measuring meteorological visibility based on digital photography-dual differential luminance method and experimental study ［J］. Chinese Journal of Atmospheric Science, 2004, 28(4): 559-569(in Chinese).

[6] [6] Zhang Yujin. Image Processing ［M］. Beijing: Tsinghua University Press, 2005: 128-132(in Chinese).

[7] [7] Griggs D J, Jones D W, Ouldridge M, et al. The First WMO Intercomparison of Visibility Measurements: Final Report ［R］. Instruments and Observing Methods Report No.41, Geneva, 1990, WMO/TD-No.4.