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无人机影像局部增强方法及其在影像匹配中的应用

DOI: 10.6046/gtzyyg.2013.04.09, PP. 53-57

Keywords: 无人机影像,局部增强,匹配,可变窗口,梯度差

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Abstract:

无人机影像的质量与成像时的光线、成像角度及所拍摄地物的特征有着密切关系。很多影像都存在着视觉对比度差、影像畸变大及分辨率低等缺点,给后续影像匹配和正射纠正带来困难。为了提高无人机影像的匹配效果,首先利用原始影像的离散灰度信息计算每个像元灰度值与整个影像灰度平均值的离散程度,并把影像划分为不同区域;然后利用距离加权插值方法计算的变换函数对各区域影像进行不同程度的增强处理,对增强后影像的直方图进行修正;最后利用核线约束法对影像进行匹配和均匀度检验。研究结果表明,由于增强后影像的灰度梯度差变大,在畸变较大及灰度变化较小的林地分布区域,影像的匹配成功率和均匀度都有一定程度的提高。

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