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结合暗通道原理和双边滤波的遥感图像增强

DOI: 10.11834/jig.20140218

Keywords: 暗通道|双边滤波|图像增强|遥感图像

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Abstract:

目的在遥感应用如目视解译等任务中,需要提高遥感影像的视觉质量,为此提出一种基于暗通道原理和双边滤波的遥感图像增强算法。方法由于暗通道模型的softmatting过程计算复杂性高,故使用双边滤波估计大气光幕,进而获得优化透射图,代替He算法中softmatting过程,提高了计算效率。针对将暗通道原理应用于遥感图像增强时所产生的色彩失真现象,提出透射图的改进算法,提高景深图像的取值,同时约束其最大值不大于1。最后,基于景深图像和暗通道原理获得增强后的遥感图像。结果实验结果表明,本文算法能够有效地增加图像的对比度。与基于双边滤波单尺度Retinex图像增强、四尺度Retinex增强、直方图均衡化及MSRCR增强的结果进行了比较,实验结果验证了算法的有效性。结论本文模型能够使处理后的遥感图像更符合视觉特性,以便于目视解译与分析。该算法适用于遥感图像的可视化增强。

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