数字全息测量系统的散斑噪声抑制  

Speckle Noise Suppression of Digital Holography Measuring System

作　　者：牛瑞 田爱玲 王大森 刘丙才 王红军 钱晓彤 刘卫国 Niu Rui;Tian Ailing;Wang Dasen;Liu Bingcai;Wang Hongjun;Qian Xiaotong;Liu Weiguo(Shaanxi Province Key Laboratory of Membrane Technology and Optical Test,School of Optoelectronic Engineering,Xi’an Technological University,Xi’an 710021,Shaanxi,China;The Ningbo Branch of Ordnance Science Institute of China,Ningbo 310022,Zhejiang,China)

机构地区：[1]西安工业大学光电工程学院陕西省薄膜技术与光学检测重点实验室,陕西西安710021 [2]中国兵器科学院宁波分院,浙江宁波310022

出　　处：《激光与光电子学进展》2022年第16期76-82,共7页Laser & Optoelectronics Progress

基　　金：基础科研项目(JCKY2018426C002,JSZL2018411C001);科技厅项目(2019KW-016)。

摘　　要：数字全息测量系统中,记录过程引入的散斑噪声严重影响全息图质量,导致三维重建结果存在误差。相位提取是数字全息三维测量系统中影响精度的关键技术,而相位解包是获得正确连续相位的关键环节。为了抑制数字全息测量系统中的散斑噪声,提出了一种处理包裹相位的散斑噪声抑制方法。首先应用二维高斯窗口在频域内对包裹相位进行局部分析,并基于窗口傅里叶基函数与包裹相位的高相关性选取阈值;然后根据阈值舍弃噪声频谱,获得低散斑噪声的包裹相位。以微透镜阵列为测试对象,实现了数字全息测量系统中散斑噪声的有效抑制。实验结果表明,所提方法保留了包裹相位的2π跳变边界,有效提高了数字全息测量系统的三维重建精度,与未去噪的结果相比,残差降低了28.35%(峰谷值)和20.23%(均方根)。In the digital holographic measurement system,the speckle noise introduced during recording severely affects the hologram quality,leading to errors in the three-dimensional(3D)reconstruction results.Phase extraction is instrumental in affecting accuracy in a digital holographic 3D measurement system,and the result of phase unwrapping is crucial in obtaining the correct continuous phase.To suppress the speckle noise in the digital holographic measurement system,this study proposes a suppression method dealing with the wrapped phase.A two-dimensional Gaussian window was used to locally analyze the wrapped phase in the frequency domain.The threshold was selected based on the high correlation between the window Fourier basis function and wrapped phase.According to the threshold,the noise spectrum was discarded to obtain the wrapped phase with low speckle noise.The digital holographic measurement system with effective speckle noise suppression was realized using the microlens array as the test object.Results show that the proposed method protects the 2πjump boundary of the wrapped phase and can effectively improve the 3D reconstruction accuracy of the digital holographic measurement system.Compared with the unfiltered result,the residual error of the proposed method is reduced by 28.35%(peak valley)and 20.23%(root mean square).

关 键 词：全息 数字全息 散斑噪声 二维高斯窗口 包裹相位 三维重建 

分 类 号：O438.1[机械工程—光学工程]