基于彩色正交条纹的串扰与色差补偿方法  

Compensation Method for Crosstalk and Chromatic Aberration Based on Color Orthogonal Fringe Patterns

作　　者：马凤 倪育博 孟召宗 高楠[1] 杨泽青[1] 张国锋[2] 尹伟[3] 赵洪伟 张宗华[1] MA Feng;NI Yubo;MENG Zhaozong;GAO Nan;YANG Zeqing;ZHANG Guofeng;YIN Wei;ZHAO Hongwei;ZHANG Zonghua(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China;School of Mechanical Engineering,Xi′an Jiaotong University,Xi′an 710049,China;National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi′an 710065,China)

机构地区：[1]河北工业大学机械工程学院,天津300401 [2]西安交通大学机械工程学院,西安710049 [3]中国飞机强度研究所强度与结构完整性全国重点实验室,西安710065

出　　处：《光子学报》2024年第8期236-246,共11页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.U2341275,52075147);河北省教育厅科学研究项目(No.JZX2024021)。

摘　　要：提出一种基于彩色正交条纹逐像素校正串扰及色差的方法。通过投影正交彩色条纹图,建立串扰系数与平均光强、背景光强的数学模型及不同光通道间的像素匹配关系,完成串扰的消除及通道间色差的校正。对提出的方法进行实验,结果表明所提方法使得测量标准台阶的测量误差从未补偿时的0.647 mm降低为0.031 mm。与传统的串扰和色差补偿方法相比,本文所提方法的测量精度提高了0.014 mm,且所需采集的条纹图的数量减少为原来的一半,能够有效地提高条纹投影技术的测量效率及测量精度。Fringe projection technology has attracted widespread attention in academic research and engineering applications because of its advantages of non-contact,high precision,and high efficiency.On this basis,to enhance the measurement efficiency of the system,multi-channel fringe projection technology has emerged.It encodes sinusoidal fringe patterns in the red,green,and blue channels,significantly reducing the number of images captured by a camera.However,the characteristic of multichannel usage introduces both crosstalk and chromatic aberration into the system,becoming critical factors affecting measurement accuracy.Therefore,it is crucial to compensate for both crosstalk and chromatic aberration.The existing methods mostly separately correct crosstalk and chromatic aberration,which has the disadvantages of capturing multiple images,multiple procedures,and complex operations.In order to solve this problem,this paper proposes a pixel-by-pixel correction method based on orthogonal color fringes for crosstalk and chromatic aberration.Firstly,the fringe intensity information from each channel is extracted by projecting orthogonal color fringe patterns.A mathematical model is then established for crosstalk coefficients in relation to average intensity and background intensity.Then fringe intensity is corrected,thereby achieving the elimination of crosstalk.Secondly,the unwrapped phase is computed for each channel in both horizontal and vertical directions.Based on this,pixel matching relationships between different color channels are constructed.Chromatic aberration correction is then accomplished through interpolation.Using a color camera and projector,a fringe projection system has been constructed to conduct experiments on the proposed method.Measurements were performed on two objects of a plane and a standard step,indicating that the proposed method significantly enhances the measurement accuracy and efficiency.Moreover,it outperforms traditional methods in terms of measurement precision and efficiency.When measurin

关 键 词：光学系统 三维测量 串扰 色差 误差补偿 

分 类 号：TH741[机械工程—光学工程]