大曲率光学镜片视觉检测中打光光晕的产生与消除
2019-11-15
作者：朱宇栋，陈於学
单位：华中科技大学
摘要：在光学镜片表面瑕疵的视觉检测过程中，针对大曲率镜片在打光时产生光晕对瑕疵检测造成干扰的问题，从镜片曲率的角度定性地分析了随着镜片曲率的增大，光晕的产生不可避免。结合具体试验建立打光模型，从镜片焦距的角度定量地分析了光晕半径与镜片焦距的数学关系，给出了偏振片法和差分法两种光晕消除方法，均取得良好的效果。
关键词：光学镜片；光晕视觉检测；光晕消除
中图分类号：TG88；TH741；TN247文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.11.023
Generation and Elimination of Light Halo in High Curvature
Optical Glasses Visual Inspection
Zhu Yudong，Chen Yuxue
Abstract:In the process of detecting flaws which are on the surface of optical glasses through machine vision technology.About the problem that the halo generated when detecting high curvature optical glasses have a big influence on flaw detection.From the perspective of the curvature of the optical glasses，it is qualitatively analyzed that with the increase of the curvature of the optical glasses，the generation of halo is inevitable.Afterwards，a lighting model is established combining with the specific experiment，from the perspective of the focal length of optical glasses，it is quantitatively analyzed the mathematic relation between halo radius and optical glasses focal length.Finally，two methods which are polarization method and differential pretreatment are given to solve the halo and get good effect.It is a good basics for later flaw detection.
Keywords:optical glasses；flaws visual inspection；halo elimination