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基于信号子空间的激光主动成像散斑去除

, PP. 1347-1352

Keywords: 信息处理技术,激光主动成像,信号子空间,散斑噪声,时域限制,同态变换

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Abstract:

为研究激光主动成像中散斑噪声的抑制问题,提出一种基于信号子空间TDC(Time-domainconstrained)的散斑去噪方法,并搭建一套基于距离选通ICCD的激光主动照明系统进行实验验证。首先使用同态变换将乘性噪声变为加性噪声,然后利用小波变换估计噪声的协方差;接着对含噪图像进行奇异值分解并估计信号子空间的维数,根据该维数对无噪图像的协方差矩阵进行特征值分解,计算出滤波估计矩阵。将滤波估计矩阵与含噪图像卷积,最后做同态逆变换,得到降噪后的图像。结果证明本文的去噪方法拥有比经典的Lee、Frost和Kuan算法更好的散斑噪声抑制效果,同时计算时间明显缩短。

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