应用科学学报 ›› 2010, Vol. 28 ›› Issue (2): 136-141.

• 信号与信息处理 • 上一篇    下一篇

高分辨率遥感影像阴影检测与补偿的主成分分析方法

  

  1. 武汉大学遥感信息工程学院,武汉430079
  • 收稿日期:2010-01-29 修回日期:2010-03-01 出版日期:2010-03-30 发布日期:2010-03-21
  • 作者简介:王玥,博士生,研究方向:高分辨率遥感影像自动解译,E-mail: Redflower_yue@126.com;王树根,教授,博导,研究方向:摄影测量与遥感,E-mail: wangsg@whu.edu.cn

Detection and Compensation of Shadows in High Resolution Remote Sensing Images Using PCA

  1. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China
  • Received:2010-01-29 Revised:2010-03-01 Online:2010-03-30 Published:2010-03-21

摘要:

根据高分辨率遥感影像中阴影区的性质,提出一种基于主成分分析的阴影检测和补偿方法. 首先对第1主分量与原始的蓝色分量进行比值运算,采用直方图阈值法分割阴影区和非阴影区,并进行形态学处理,得到较完整的阴影区. 采用膨胀方法确定各独立阴影区中的同质区域,根据阴影同质区特性对阴影区进行线性相关拉伸,并对补偿后的阴影区进行平滑处理和主成分逆变换. 实验结果表明该方法简单有效.

关键词: 遥感, 主成分分析, 阴影检测, 阴影补偿

Abstract:

From the shadow region properties, a new algorithm of shadow detection and compensation based on principal component analysis (PCA) is proposed for high resolution remote sensing images. The ratio between the original blue band and the first principal component is computed. Shadow and non-shadow regions are segmented using the histogram-thresholding method. A morphological algorithm is used to produce an accurate shadow mask, and a dilation operation is performed to find the surrounding homogeneous region of a shadow. Each shadow region is matched to its adjacent homogeneous region to achieve shadow compensation. Finally,image smoothing and inverse PCA transformation are performed on the compensated image. Experimental results show that the algorithm is effective.

Key words: remote sensing, principal component analysis, shadow detection, shadow compensation

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