基于液晶分划和数字图像处理的正透镜焦距测量研究  

Study focus measurement based on LCD and digital image processing

作　　者：黄声野[1] 林家明[1] 沙定国[1] 苏大图[1] 

机构地区：[1]北京理工大学光电工程系,北京100081

出　　处：《光学技术》2002年第1期74-76,共3页Optical Technique

摘　　要：讨论了一种基于LCD、CCD和数字图像处理的正透镜焦距测量方法 ,是光电法自动化测量光学系统多个参数的一种有益的探讨。用液晶屏显示分划图形取代平行光管的分划板 ,用CCD在接收方采集数字图像并送入计算机 ,通过图像处理和分析得出被测透镜的焦距。运用叠加的方法提高图像的信噪比 ;结合重心法和平行线拟合方法求取平行线对的间距 ;应用高精度焦距标准透镜标定数字图像和实际像之间的比例关系。详细介绍了测量和图像处理的方法 ,进行了公式推导和误差分析 。A novel method of measuring plus lens's focus is given, which is based on LCD, CCD, and digital image processing It is also a discussion on photoelectric method of automatically measuring parameters of an optic system In this method, a LCD is used as a reticle of the collimator, while the image on the accepting side is transformed into digital image and is sent into a computer The focus can finally be calculated out through digital image processing and analysis The method of measurement is introduced in detail, and derivation of formulae, error analysis and experimental result are also provided

关 键 词：焦距测量 LCD CCD 数字图像处理 放大率法 平行线拟合 液晶 

分 类 号：O435[机械工程—光学工程]