变分贝叶斯解卷积法在激光反射层析成像中的应用  

Application of Variational Bayesian Deconvolution Method in Laser Reflective Tomography Imaging

作　　者：谷雨[1,2] 胡以华[1,2] 郝士琦[1,2] 王金诚[1,2] 王迪[1,2] 

机构地区：[1]电子工程学院脉冲功率激光技术国家重点实验室,安徽合肥230037 [2]电子工程学院电子制约技术安徽省重点实验室,安徽合肥230037

出　　处：《光学学报》2016年第6期108-114,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61271353);安徽省自然科学基金(1308085QF123);脉冲功率激光技术国家重点实验室主任基金

摘　　要：基于距离分辨的激光反射层析成像是一种兼顾远距离和高分辨率成像特点的新型激光成像系统。激光发射脉冲宽度大于采样周期时,接收回波被视作反射率分布与发射脉冲的卷积。在重构目标反射率分布轮廓时成像分辨率降低。运用变分贝叶斯方法对1维探测回波信号进行非盲解卷积处理,对探测回波进行脉冲压缩,有效解决了由卷积效应带来的图像降质。设计了激光反射层析实验,并对实测数据进行了处理。重构图像表明此方法有效提高了系统成像分辨率。Range-resolving laser reflective tomography imaging is a new type of laser imaging system which takes both long-range and high-resolution imaging characteristics into account.When the pulse width of laser emission is larger than the sampling period,the received echo is regarded as the convolution of reflectance distribution and emission pulses.Imaging resolution can be reduced when the target reflectance distribution profile is reconstructed.Non-blind deconvolution of one-dimensional detected echo signal is carried out with variational Bayesian method.Pulse compression of the detected echo signal is done,and the issue of image degradation caused by the convolution effect is solved effectively.The laser reflective tomography experiment is designed and the measured data are processed.Reconstructed images show that the proposed method can effectively improve image resolution of the system.

关 键 词：成像系统 反射层析 解卷积 变分贝叶斯法 脉冲压缩 成像分辨率 

分 类 号：O439[机械工程—光学工程]