Inspection of extremely slight aesthetic defects in a polymeric polarizer using the edge of light between black and white stripes
Inspection of extremely slight aesthetic defects in a polymeric polarizer using the edge of light between black and white stripes
复制标题
使用黑白条纹之间的光边缘检查聚合物偏光片中极轻微的美学缺陷
DOI：
10.1016/j.polymertesting.2017.11.019
复制
发表时间：
2018-02-01
期刊：
影响因子：
5.1
通讯作者：
Yu, Ci-long
中科院分区：
文献类型：
--
作者：
Deng, Yuan-long;Xu, Shao-peng;Yu, Ci-long
机器视觉系统以其自动化、非接触式检测等优点，在工业生产线上得到了广泛的应用。检测聚合物偏光片中的缺陷是机器视觉的典型应用。聚合物偏振器中极轻微的透明美学缺陷(ESTAD)无法使用传统照明(如白光和结构光)成像。因此，本研究提出了一种利用结构光照明中的光边缘来检测ESTADs的新的自动化检测方法，并发现这可以显著提高图像的对比度。建立了成像增强的光学模型，研究了成像增强机理。模拟结果与实验结果吻合较好，并确定了照明原理来解释成像现象。最后，通过主动光照扫描验证了该检测方案的可行性，该方法对于聚合物薄膜和产品缺陷的实时、原位检测是有效的。
Machine vision systems have been widely used on industrial production lines because of their advantages such as automation and contactless inspection. The detection of defects in a polymeric polarizer is a typical application of machine vision. Extremely slight transparent aesthetic defects (ESTADs) in a polymeric polarizer cannot be imaged using conventional illumination such as white light and structured light. Therefore, this study proposed a novel and automated inspection method for detecting ESTADs by employing the edge of light in structured light illumination, and this was found to drastically enhance the image contrast. An optical model was established to investigate the imaging enhancement mechanism. The simulation results were consistent with the experimental results, and the lighting principle was also determined to interpret the imaging phenomena. Finally, active lighting scanning was performed to demonstrate the feasibility of this inspection scheme; the proposed method is efficient for the real-time and in situ inspection of defects in polymer films and products.