基于条纹对比度和背景光校准的正交复合光三维测量方法  

A 3-D Measurement Method with Orthogonal Composite Light Based on Fringe Contrast and Background Calibration

作　　者：何宇航[1] 曹益平[1] 翟爱平[1] 

机构地区：[1]四川大学光电科学技术系,四川成都610064

出　　处：《光学学报》2010年第11期3191-3196,共6页Acta Optica Sinica

基　　金：国家863计划(2007AA01Z333);国家科技重大专项(2009ZX02204-008);四川省科技攻关项目(2006Z01-028)资助课题

摘　　要：提出了一种对条纹对比度和背景光进行校准的正交复合光三维测量方法。从参考平面的复合光栅像中解调获得各帧相移正弦条纹,通过频域滤波的方法获取条纹的零频和基频分量,计算出各帧相移正弦条纹相对第一帧正弦条纹的对比度和背景光比例系数,并以此系数对实物测量时解调出来的各帧变形条纹对比度和背景光进行校准,建立了新的三维测量数学模型。实验证明该方法能降低传统正交复合光三维测量方法中的解相误差,提高系统的测量精度。A three dimensional（3-D） measurement method with orthogonal composite grating based on fringe contrast and background calibration is presented.We get the phase-shifted sine fringes from the composite grating image captured on the reference plane,and the zeroth order spectrum and first order spectrum of the phase-shifting sinusoidal fringes can be obtained by filtering in spatial frequency domain,then the ratio coefficients of contrast and background between the sinusoidal fringes can be calculated out.When an object is measured,the contrast and background of the demodulated deformed fringes can be calibrated by these ratio coefficients,and new 3-D measurement mathematical model is set up.Experiments prove that the new method can effectively reduce phase error,and improve measurement accuracy.

关 键 词：测量 复合结构光 三维测量 正弦条纹 频谱混叠 相位算法 

分 类 号：O436[机械工程—光学工程]