基于散斑去模糊的数字图像相关深度量程拓展

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关键词：散斑去模糊;深度量程拓展;数字图像相关技术；离面位移；维纳滤波中图分类号：TP394.1;TH691.9 文献标识码：Adoi：10.37188/OPE.20253318.2857 CSTR：32169.14.OPE.20253318.2857

Depth range extension in digital image correlation through speckle deblurring

HUANGHaisheng，NIZihao，BAIYulei，DONGBo （School of Automation，Guangdong Uniuersity of Technology， Guangzhou 5lOoo6，China） *Corresponding author，E-mail： b. dong@gdut. edu. cn

Abstract：In the vibration measurement of two-dimensional digital image correlation technology（2DDIC），the limited depth range willcause speckle image blurring when the out-of-plane displacement of the speckle is too large. In order to realize the expansion of the depth range，this paper proposed a deblurring method for defocusing speckles that combined Wiener filtering and adaptive local smoothing. The method first analyzed the mechanism ofdefocus blur in speckle images and used Wiener filtering to restore the original blurred images. Subsequently，an adaptive local smoothing strategy was introduced to suppress the ringing effect caused by Wiener filter deconvolution. Finally，to verify the effectiveness of the proposed method，experiments were conducted on defocused speckle deblurring，out-of-plane displacement measurement，and vibration measurement. In the experiment of defocused deblurring effect，the speckle image obtained a higher average intensity gradients and a smaller optimal subset sizes，indicating that the new method could effectively improve the speckle contrast and produced high-quality restored images. In the out-of-plane displacement reconstruction experiment，the maximum dynamic measurement range was increased by 9% ，and the dispersion degree of the measured value of the out-of-plane displacement was reduced by 8.8% compared with the real value，which effectively extended the depth range of 2D-DIC. In the actual vibration measurement，the method improved the signal-to-noise ratio of periodic vibration by （204号 5.5% ，and reduced the mean error by 2.4% ，which effectively increased the measurement accuracy of 2D-DIC.The proposed method in this paper significantly expands the measurement capability of traditional 2D-DIC in the depth direction，and provides reliable technical support for ful-field vibration monitoring in complex dynamic scenarios.

Key Words： speckle deblurring；depth range extension；digital image correlation；out-of-plane displacement;wiener filtering

1引言

振动是机械系统运行状态的一个关键指标，它不仅反映了设备的健康状况和性能变化，而且对于预测性维护、故障诊断及优化设计等方面有着至关重要的意义。（剩余15224字）