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一种新型高光谱实时异常检测算法

Keywords: 高光谱异常检测 实时算法 Woodbury引理

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Abstract:

异常检测是高光谱遥感技术应用的一个重要方向.然而随着高光谱数据量的增大, 实时处理成为高光谱异常检测方法所面临的主要问题.基于此, 文中提出了一种新型的高光谱图像实时异常检测方法.随着数据的实时下行传输, 该异常算子仅仅利用了待检测像元之前已获取的所有像元信息, 而并没有用到尚未获取的像元信息, 使得数据边传输边处理成为可能;同时, 利用卡尔曼滤波器的递归思想, 用Woodbury引理从上一时刻的状态更新目前信息, 避免了重新计算历史信息及存储所有像元, 在大大缩短算法运行时间的同时, 大大降低了所需的存储空间.接收机特性曲线显示, 与传统异常检测算法相比, 这种新型实时算法可获得几乎相同的检测精度.在不影响检测效果的前提下, 时间复杂度曲线和算子运行时间可显示提出算法的时效性.与此同时, 提出的的状态更新公式不需要重新计算已有像元信息, 因此只需两个存储单元存储前一时刻的状态(协方差矩阵或相关矩阵)以及当前的新像元信息, 从而大大降低了算法所需的存储空间

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