阴影是遥感影像的基本特征之一，它将干扰图像匹配、图象变化检测或图像中信息的提取，而去除阴影则是遥感图像处理的难题。
Shadow is one of the features in remote sensing image. It affects image matching, change detection or information extraction. But removing that is usually very hard in image processing.
由于先验知识并不是很容易获得的，所以在许多实际应用中非监督图象变化检测方法是一种基本方法。
The effective unsupervised change-detection method is fundamental in many applications in that the suitable ground-truth information is not always available.
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