中国激光, 2013, 40 (11): 1109001, 网络出版: 2013-10-20   

基于信号子空间谱域约束的激光主动成像散斑噪声去除

Speckle Noise Suppression for Laser Active Imaging Based on Spectrum-Domain Constrain in Signal Subspace
王灿进 1,2,3,*孙涛 1,2王锐 1,2王挺峰 1,2陈娟 1,2
作者单位
1 中国科学院长春光学精密机械与物理研究所光电部, 吉林 长春 130033
2 中国科学院长春光学精密机械与物理研究所激光与物质相互作用国家重点实验室, 吉林 长春 130033
3 中国科学院大学, 北京 100049
摘要
为有效抑制激光主动成像中的散斑噪声以及减少运算耗时,提出一种基于信号子空间谱域约束的散斑去噪方法。使用同态变换将乘性噪声变为加性噪声,对含噪图像进行奇异值分解并估计信号子空间的维数,根据该维数对含噪图像的协方差矩阵进行特征值分解,利用噪声子空间的特征值估计噪声的方差。根据信号子空间的特征向量计算出滤波估计矩阵,并与含噪图像卷积,做同态逆变换,得到降噪后的图像。为了去除后向散射和背景辐射对实验结果的影响,搭建一套基于距离选通ICCD的激光主动照明系统,采集不同散斑强度的主动照明图像进行实验。结果表明该方法拥有比经典的Lee、Frost和Kuan算法更好的散斑噪声抑制效果,同时运算时间在毫秒量级,满足激光主动成像算法实时性的需求。
Abstract
To suppress speckle noise efficiently and achieve less time consuming in laser active imaging, a denoising method based on spectrum-domain constraint in signal subspace is proposed. Homomorphic transform is performed to convert the multiplicative noise to additive noise. The noisy image is decomposed using singular value decomposing to estimate the dimension of signal subspace. Based on the dimension, the covariance matrix of the noisy image is decomposed using eigenvalue decomposing to estimate the covariance of speckle noise with the eigenvector in noise subspace. After that the denoising estimating matrix is computed with the eigenvector in signal subspace and is convolved with the noisy image. Inverse homomorphic transform is carried out and the denoised image is obtained. In order to eliminate the effect of backscatter and background radiation, a laser active imaging system based on range gating ICCD is constructed. The experiment is performed using images with speckle noise in different levels and the results show that compared with classical Lee, Frost and Kuan filters, the proposed method has advanced denoising performance and the computing time is in millisecond level, which meets the requirement of real-time operation for laser active imaging.

王灿进, 孙涛, 王锐, 王挺峰, 陈娟. 基于信号子空间谱域约束的激光主动成像散斑噪声去除[J]. 中国激光, 2013, 40(11): 1109001. Wang Canjin, Sun Tao, Wang Rui, Wang Tingfeng, Chen Juan. Speckle Noise Suppression for Laser Active Imaging Based on Spectrum-Domain Constrain in Signal Subspace[J]. Chinese Journal of Lasers, 2013, 40(11): 1109001.

本文已被 2 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!