Paperboard Coating Detection Based on Full-Stokes Imaging Polarimetry

被引:3
作者
Bruges Martelo, Javier [1 ]
Lundgren, Jan [1 ]
Andersson, Mattias [2 ]
机构
[1] Mid Sweden Univ, Elect Design Dept, S-85170 Sundsvall, Sweden
[2] Mid Sweden Univ, Dept Design, S-83125 Ornskoldsvik, Sweden
关键词
imaging polarimetry; stokes parameters; extruded plastic coatings; support vector machines; POLARIZATION; SURFACE; REFLECTANCE;
D O I
10.3390/s21010208
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The manufacturing of high-quality extruded low-density polyethylene (PE) paperboard intended for the food packaging industry relies on manual, intrusive, and destructive off-line inspection by the process operators to assess the overall quality and functionality of the product. Defects such as cracks, pinholes, and local thickness variations in the coating can occur at any location in the reel, affecting the sealable property of the product. To detect these defects locally, imaging systems must discriminate between the substrate and the coating. We propose an active full-Stokes imaging polarimetry for the classification of the PE-coated paperboard and its substrate (before applying the PE coating) from industrially manufactured samples. The optical system is based on vertically polarized illumination and a novel full-Stokes imaging polarimetry camera system. From the various parameters obtained by polarimetry measurements, we propose implementing feature selection based on the distance correlation statistical method and, subsequently, the implementation of a support vector machine algorithm that uses a nonlinear Gaussian kernel function. Our implementation achieves 99.74% classification accuracy. An imaging polarimetry system with high spatial resolution and pixel-wise metrological characteristics to provide polarization information, capable of material classification, can be used for in-process control of manufacturing coated paperboard.
引用
收藏
页码:1 / 14
页数:14
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