从多波段图像中获取大气透过率的测量方法

发布时间：2019-04-02 20:39

【摘要】：提出了一种基于单帧多波段图像测量非气体吸收波段和弱气体吸收波段大气透过率的方法,可应用于相关光电工程中评估和修正大气衰减影响.首先,利用经过绝对辐射定标的图像采集设备获得辐射图像;其次,基于大气中图像退化光学模型与暗通道先验统计理论得到辐射图像暗通道对应的宽波段平均大气透过率;最后,结合特定波段消光系数和宽波段平均消光系数间的关系得到特定波段的大气透过率.实验对比分析表明:本文方法与能见度仪、激光雷达测量结果相关性较高,其中与能见度仪相比,相关系数在0.89和0.95之间,与激光雷达相比,相关系数在0.95和0.97之间;在1km近距离条件下与能见度仪、激光雷达测量结果平均相对偏差最高分别为9%和6%,在远距离条件下,与能见度仪测量结果相比,4km和6km平均相对偏差最高分别为15%和30%,与激光雷达测量结果相比,4km和6km平均相对偏差最高分别为9%和18%.
[Abstract]:A method for measuring the atmospheric transmittance of non-gas absorption band and weak gas absorption band based on single frame multi-band image is presented. It can be used to evaluate and correct the atmospheric attenuation effect in correlative photoelectric engineering. Firstly, the radiation image is obtained by using the image acquisition equipment which has been calibrated by absolute radiation, secondly, the wide band mean atmospheric transmittance corresponding to the dark channel of the radiation image is obtained based on the optical model of image degradation in the atmosphere and the theory of dark channel priori statistics. Finally, the atmospheric transmittance of specific band is obtained by combining the relationship between the extinction coefficient of specific band and the average extinction coefficient of wide band. The experimental results show that this method has a high correlation with the visibility meter and lidar measurement results, and the correlation coefficient is between 0.89 and 0.95, compared with the lidar, and the correlation coefficient is between 0.89 and 0.95, compared with the lidar, and the correlation coefficient is between 0.89 and 0.95. The correlation coefficients are between 0.95 and 0.97; The average relative deviation between 1km and visibility meter is up to 9% and 6%, respectively. In long range, compared with visibility meter, the average relative deviation of Lidar measurement results is 9% and 6%, respectively, and compared with that measured by visibility meter at long distance. The average relative deviations of 4km and 6km are 15% and 30%, respectively. Compared with lidar measurements, the average relative deviations of 4km and 6km are 9% and 18%, respectively.
【作者单位】：中国科学技术大学环境科学与光电技术学院;中国科学院安徽光学精密机械研究所大气成分与光学重点实验室;光电对抗测试评估技术重点实验室;
【基金】：国家自然科学基金(No.41505023) 光电对抗测试评估技术重点实验室开放课题(No.GKCP2016002)资助~~
【分类号】：P412;TP391.41

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