摘要
系统焦距是光学系统中一项重要的技术指标,通常采用光栅二次调焦或摩尔条纹同向法进行测量,其过程繁琐、周期长。本文提出基于玻罗板图像处理技术的焦距测量方法,CCD获取平行光管的玻罗板的分划线图像,采用放大率法结合分划线亚像素的定位技术检测系统焦距,普通算法的精度只能达到像素级,本文采用投影法和二项式曲线拟合相结合的算法,使定位精度达到了亚像素级。试验结果表明该方法具有标校过程简单、快速,标校精度高等优点,其标定误差小于0.5mm。
Focus is an important technical indicators in the optical system,it is usually？measured by the measurement of the second focusing lens measuring focal length with grating and identical direction Moire fringe,and the process of messurement is usually fussy and costs a long time.The paper puts foward a focus detection measurement of optical system based on Porro board image processing technology,this methord gets images of Porro board by CCD,detects system focus using the method of magnification and subpixel of reticle orientation Technology.The orientation precision of general algorithms can only achieve pixel level,the orientation precision of the algorithm adopted by the paper,using projective geometry and binomial curve fitting,has reached subpixel level.The experiment results indicate that this method has advantages of simplicity,speed and high precision,the calibration error is less than 0.5mm.
出处
《长春理工大学学报（自然科学版）》
2011年第4期16-19,共4页
Journal of Changchun University of Science and Technology(Natural Science Edition)
关键词
系统焦距
放大率法
图像处理
玻罗板
focus
the method of magnification
image processing
Porro board
