一种改进的夜间数字能见度测量方法

肖韶荣, 周佳, 吴群勇, 徐猛, 尚国庆, 石刘峰

肖韶荣, 周佳, 吴群勇, 徐猛, 尚国庆, 石刘峰. 一种改进的夜间数字能见度测量方法[J]. 应用光学, 2014, 35(6): 1016-1022.
引用本文: 肖韶荣, 周佳, 吴群勇, 徐猛, 尚国庆, 石刘峰. 一种改进的夜间数字能见度测量方法[J]. 应用光学, 2014, 35(6): 1016-1022.
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Xiao Shao-rong, Zhou Jia, Wu Qun-yong, Xu Meng, Shang Guo-qing, Shi Liu-feng. Improved method for nighttime visibility measurement based on digital photography[J]. Journal of Applied Optics, 2014, 35(6): 1016-1022.
Citation: Xiao Shao-rong, Zhou Jia, Wu Qun-yong, Xu Meng, Shang Guo-qing, Shi Liu-feng. Improved method for nighttime visibility measurement based on digital photography[J]. Journal of Applied Optics, 2014, 35(6): 1016-1022.
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一种改进的夜间数字能见度测量方法

  • 1.

    南京信息工程大学 物理与光电工程学院,江苏 南京 210044;

  • 2.

    南京信息工程大学 电子与信息工程学院,江苏 南京 210044

基金项目: 

科技部公益性（气象）行业专项(GYHY201203067);江苏省科技支撑计划(BE2010733)

详细信息
    通讯作者:

    肖韶荣(1958-)，男，江西吉安人，博士，教授，主要从事激光技术应用和光电系统信号处理的技术研究。 Email：sr.xiao@163.com

  • 中图分类号: TN948.41;TP274.2

Improved method for nighttime visibility measurement based on digital photography

  • 1.

    School of Physics and Optoelectronic Engineering,Nanjing University of Information Science andTechnology,Nanjing 210044,China;

  • 2.

    School of Electronics and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China

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    摘要
  • 摘要: 为降低背景光噪声对数字摄像法夜间能见度测量的不确定性影响，对双光源法能见度测量系统进行改进。该系统利用避光筒限制CCD相机视场角，拍摄2个位于不同距离的LED背光源，然后对摄取到的图像进行处理得到光源图像的灰度值，再根据阿拉德定律求得大气消光系数，计算出大气能见度值。通过在无背景光、有背景光未加避光筒和加避光筒3种条件下的比对实验，分析光源图像的灰度信息，并将实验结果进行处理，得出有避光筒和无避光筒时测得的能见度值与无背景光下测量结果的相关系数分别是0.911 3和0.322 7，均方根相对偏差分别是6.87% 和23.38%。结果表明：系统抑制背景光噪声的能力明显增强，能较准确地测量夜间能见度。
    Abstract: In order to reduce the uncertainty caused by background light noise when measuring nighttime visibility using digital photogrammetric method, the system based on double light sources was improved. An effective method was adopted to limit CCD field angle by using the shading cylinder. For obtaining the grayscales of the double LED backlights at different distances taken by CCD, computerized image processing was applied for captured images. Then the visibility was derived from extinction coefficient acquired by Allard-s law. The contrast test was done to analyze the gray information in three conditions: in dark background, with or without shading cylinder in light background. Taken the visibility measured in dark background as the standard value,compared with the results from using shading cylinder ,the correlation coefficient and average relative errors are 0.911 3 and 6.87%, while they are 0.322 7 and 23.38% without shading cylinder.It can be seen that, the ability of restraining interference from background noise is enhanced by using shading cylinder, thus more accurate results can be got with measuring nighttime visibility.
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    • 参考文献(1)
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  • 刊出日期:  2014-11-14

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