基于多尺度双边滤波Retinex的非均匀光照散斑图像矫正  

Non-uniform illumination speckle image correction based on multi-scale bilateral filtering Retinex

作　　者：陈松 温宇鑫 安浩铭 CHEN Song;WEN Yuxin;AN Haoming(College of Mechanical Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学机械工程学院,贵阳550025

出　　处：《激光技术》2025年第1期33-40,共8页Laser Technology

基　　金：贵州省科技支撑计划资助项目(黔科合支撑[2023]一般205);贵州省基础研究计划自然科学基金资助项目(黔科合基础-ZK[2022]一般117);贵州大学人才引进项目(2020-026)。

摘　　要：为了解决场景中非均匀光照导致散斑图像质量下降,进而影响数字图像相关测试精度的问题,采用多尺度双边滤波Retinex算法对散斑图像进行光学校正,实现光照不均匀场景下位移场与应力场的高精度光学测量;进行了模拟散斑图像的亚像素位移的实验,并与现有图像光学校正算法进行对比,取得了相应散斑图像位移均值误差、标准偏差以及质量评价指标数据。结果表明,所提出的算法对于非均匀光照散斑图像具有良好的校正效果,可以解决图像边界模糊和局部过度校正的问题,校正后散斑图像的平均灰度梯度从12.986上升到14.574,位移标准偏差从0.0443下降到0.0335。该方法可以增强散斑质量,保证光照不均匀场景下数字图像相关方法的测试精度和稳定性,提高复杂光照场景下数字图像相关方法的测试精度,为实际环境中光照突变的非接触测量提供了参考。In order to solve the problem of speckle image quality degradation caused by non-uniform lighting in the scene,which affects the testing accuracy of digital image correlation,the multi-scale bilateral filtering Retinex algorithm was used to perform optical correction on speckle images,achieving high-precision optical measurement of displacement and stress fields in non-uniform lighting scenes.Experiments were conducted to simulate sub-pixel displacement of speckle images and compared them with existing image optical correction algorithms,the corresponding speckle image displacement mean error,standard deviation,and quality evaluation index data were respectively obtained.The results show that the proposed algorithm has a good correction effect on non-uniform illumination speckle images,and the problems of image boundary blur and local overcorrection can be solved.The average grayscale gradient of the corrected speckle image increased from 12.986 to 14.574,and the displacement standard deviation decreased from 0.0443 to 0.0335.This method can effectively enhance the quality of speckle,ensure the testing accuracy and stability of digital image correlation methods in scenarios with uneven lighting,improve the testing accuracy of digital image correlation methods in complex lighting scenarios,and provide reference for non-contact measurement of lighting mutations in actual environments.

关 键 词：图像处理 非均匀光照校正 双边滤波 RETINEX算法 数字图像相关 

分 类 号：O439[机械工程—光学工程] TP391[理学—光学]