彩色遥感影像阴影颜色特性分析

为了获得具有标识性且易于获取的阴影特征,总结了彩色图像常见的颜色模式,分析和研究了遥感影像中阴影的亮度、色调、饱和度以及阴影区B通道与G通道强度之间的关系等颜色特性.通过系列实验和分析可知:1)彩色遥感影像色调通道中的高亮值对阴影区域的位置具有一定程度的指示作用；2)低亮度是遥感影像中阴影的重要特征；3)同一幅遥感影像阴影区的饱和度在整体上具有一致性；4)同一幅遥感影像上,阴影区像素B通道强度与G通道强度的大小关系具有一定程度上的一致性.利用这四种特征进行自动阴影识别的初步结果,验证了这四种特征在对遥感影像阴影区的综合标识上是有效的,可以作为计算机阴影自动检测方法的建模基础.

Color Property Analysis of Remote Sensing Imagery

In order to acquire some identified shadow features which can be easily obtained,several common color models used in image color space were summarized,and then the intensity,the hue,the saturation,the relation between G magnitude and B magnitude of shadows in color remote sensed images were studied.Based on a series of experiments and theoretical analysis,several conclusions were obtained:1) higher-level values in hue channel can indicate the locations of shadow in a certain degree; 2) low intensity is an important property of shadows in remote sensed image; 3) the saturation distributions of most shadowed areas are similar in general; 4) to the different shadow areas in a same image,the G components are always higher than the B components or always lower than the B components in most cases,and also this relation keeps consistency in the statistical sense.Experiments indicate that these shadow features are useful for automatic shadow detection in color images and can be used as the basic features for model building.