A novel imaging-enhancement-based inspection method for transparent aesthetic defects in a polymeric polarizer
A novel imaging-enhancement-based inspection method for transparent aesthetic defects in a polymeric polarizer
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一种基于成像增强的新型聚合物偏光片透明美学缺陷检测方法
DOI：
10.1016/j.polymertesting.2017.05.029
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发表时间：
2017-08-01
期刊：
影响因子：
5.1
通讯作者：
Lai, Wen-wei
中科院分区：
文献类型：
--
作者：
Deng, Yuan-long;Xu, Shao-peng;Lai, Wen-wei
聚合物偏振器的透明美学缺陷难以使用常规照明成像和表征。为了检测这种特殊的缺陷，自动检测方法进行了研究，采用结构化照明技术，以显着提高缺陷成像。该缺陷被建模为微尺度平凸透镜，其在其正常区域内具有轻微的折射率差异。将结构光源的二值条纹图案等效为一维光阑，模拟了缺陷的成像增强机理。实验结果与模拟结果吻合较好，表明该模型和机理是可行的。提出了一种新的空间纹理滤波算法，用于结构光图像的滤波处理。大约200个有缺陷的样品成功地成像、处理和表征。这种检测方法得到了最终实验结果的验证，并有可能在其他聚合物薄膜和产品的缺陷的实时和原位测试。(C)2017由Elsevier Ltd.出版
The transparent aesthetic defects of polymeric polarizers are difficult to image and characterize using conventional illumination. To inspect such special defects, an automated inspection method was studied that employs the structured lighting technique to markedly enhance defect imaging. The defect was modelled as a microscale piano-convex lens, which has a slight difference in refractive index within its normal region. The imaging enhancement mechanism of the defect was simulated with a model in which the binary stripe patterns of the structured-light source are equivalent to a one-dimensional diaphragm. The experimental results were in agreement with the simulation, suggesting that the model and mechanism are feasible. A novel spatial texture filtering algorithm with higher speed and higher accuracy is proposed to process the structured light images. Approximately 200 samples with defects were successfully imaged, processed and characterized. This inspection method was verified by the final experimental results and has potential for real-time and in situ testing of defects in other polymer films and products. (C) 2017 Published by Elsevier Ltd.