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1.中国科学院大学,北京 100049
2.中国科学院 长春光学精密机械与物理研究所,吉林 长春 130033
[ "韩昊男 (1993-),男,吉林白山人,博士研究生,2016年于哈尔滨工业大学获得理学学士学位,主要从事计算机视觉和图像处理方面的研究。E-mail:hanhaonan16@mails.ucas.edu.cn" ]
[ "钱锋 (1987-),男,湖南长沙人,博士研究生,2011年于中国科学技术大学获得工学学士学位,主要研究方向为图像处理与目标识别。E-mail: zilgard@126.com" ]
[ "吕建威 (1993-),男,辽宁大连人,博士研究生,2016年于大连理工大学获得理学学士学位,主要从事计算机视觉和图像处理方面的研究。E-mail: 1637804619@qq.com" ]
[ "张葆 (1964-),男,研究员,1989年获长春理工大学理学学士学位,1994年获长春理工大学理学硕士学位。2004年在中国科学院长春精密机械与物理研究所获得博士学位。2004年5月至8月,曾任澳大利亚悉尼大学、阿德莱德大学高级访问学者。主要研究方向:图像处理、光学设计、目标识别与跟踪。E-mail:zhangb@ciomp.ac.cn" ]
收稿日期:2019-11-26,
录用日期:2020-2-5,
纸质出版日期:2020-06-15
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韩昊男, 钱锋, 吕建威, 等. 改进暗通道先验的航空图像去雾[J]. 光学精密工程, 2020,28(6):1387-1394.
Hao-nan HAN, Feng QIAN, Jian-wei LÜ, et al. Aerial image dehazing using improved dark channel prior[J]. Optics and precision engineering, 2020, 28(6): 1387-1394.
韩昊男, 钱锋, 吕建威, 等. 改进暗通道先验的航空图像去雾[J]. 光学精密工程, 2020,28(6):1387-1394. DOI: 10.3788/OPE.20202806.1387.
Hao-nan HAN, Feng QIAN, Jian-wei LÜ, et al. Aerial image dehazing using improved dark channel prior[J]. Optics and precision engineering, 2020, 28(6): 1387-1394. DOI: 10.3788/OPE.20202806.1387.
目前较为流行的去雾算法都存在着过度增强以及增强不足,容易造成光晕效应以及色彩严重失真。提出一种基于四叉树细分的改进大气光估计方法以及一种改进的引导滤波用来解决这些问题。首先,对非重叠暗通道使用四叉树细分方法估计更加可靠的大气光值。然后,分析引导滤波在边缘区域的光晕效应产生的原因,对其加入自适应权重因子,用改进后的引导滤波对初始传输图进行优化。最后,用估计的大气光值和优化后的传输图根据大气散射模型得到去雾图像。实验结果表明:去雾后的图像颜色较为可靠,边缘区域光晕效应减弱。从颜色可靠性和细节增强度来说,提出的算法比现阶段的去雾算法有较为出众的表现。
Most existing dehazing algorithms suffer from under-or over-enhancement
color distortion
and halo artifacts. An improved method of atmospheric light estimation using quad-tree subdivision and an improved guided filter were proposed to solve these problems. First
a more faithful estimate of global atmospheric light was produced by quad-tree subdivision using a non-overlapped dark channel. Then
the reasons for the existence of halo artifacts in edge regions were discussed and an adaptive weight was added to the guided image filter. The improved guided image filter was used to refine the raw transmission map. Finally
based on the atmospheric scattering model
a dehazed image was obtained using the estimated atmospheric light value and refined transmission map. Experimental results indicate that the color of the dehazed image is more reliable and halo artifacts in edge regions are reduced. The proposed algorithm performs better than state-of-the-art haze removal algorithms in terms of color fidelity and detail enhancement.
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