摘要
条纹投影轮廓术期望被测表面反射率足够均匀以保证形貌测量精度,而数字图像相关技术则期望被测表面能够提供高对比度的纹理信息来确保图像匹配准确性和形变计算精度,二者对表面的纹理需求存在矛盾。针对这一矛盾,提出基于RGB模型的标记点纹理消隐与提取方法,通过计算特定的消隐系数与提取系数,同时提取高质量的条纹图案和纹理图案分别用于后续形貌和形变测量。实验结果表明,相较于已有方法,所提方法可以解决条纹投影轮廓术和数字图像相关技术对纹理要求的矛盾性问题,同时实现高精度的三维形貌和形变测量。
Objective In recent years,fringe projection profilometry(FPP)which can obtain dense threedimensional(3D)shape information of measured scenes and digital image correlation(DIC)technique that can realize accurate deformation tracking have been combined to form a new method for simultaneously measuring 3D shape and deformation.However,in this method,FPP expects the measured surface's reflectivity to be uniform enough to ensure high accuracy of shape measurement,while DIC requires the measured surface to provide highcontrast texture information to ensure the accuracy of image matching and deformation calculation.These two techniques have different requirements for surface texture,and the contradiction is difficult to be solved in the traditional intensity space.Therefore,we propose a marker point texture hiding and extraction method in RGB color space,and the color difference of objects and marker points in the color space is used to perform a fullfield linear transformation of color patterns.Finally,the contradiction in the texture requirements of FPP and DIC techniques is solved without the influence of color crosstalk and phaseshifting sinusoidal patterns,and accurate 3D shape and deformation measurement is achieved.Methods The basic idea of the method for achieving 3D shape and deformation measurement based on marker point hiding and extraction is to obtain hidden and extracted patterns of the marker points by using the color difference between the manmade color marker points and the object background,so that they can meet the requirements of the two techniques for the surface texture of the object.First,color marker points are made on the surface of the object according to the color of the measured object,and then graylevel structured light patterns are projected to the surface of the object.The deformed structured light patterns are collected by the color camera to obtain the texture pattern of the measured object.After that,according to the different intensity values of color marker points and backgrounds in t
作者
陈正东
张启灿
吴周杰
李训仁
王浩然
陈照升
Chen Zhengdong;Zhang Qican;Wu Zhoujie;Li Xunren;Wang Haoran;Chen Zhaosheng(College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,Sichuan,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第11期31-43,共13页
Acta Optica Sinica
基金
国家自然科学基金(62205226,62075143)
博士后创新人才支持计划(BX2021199)
中国博士后科学基金(2022M722290)
四川省重点研发计划(2021YFS0398)
中央高校基本科研业务费专项资金(2022SCU12010)。
关键词
测量
条纹投影轮廓术
三维形貌测量
数字图像相关
三维形变测量
measuremet
fringe projection profilometry
threedimensional shape measurement
digital image correlation
threedimensional deformation measurement
