CAJ | 학술논문

叠层纸张数量检测是包装印刷生产过程中重要的工艺环节，其计数精度直接影响企业经济效益。基于机器视觉成像的计数方法具有非接触、无物理损伤、实时测量等优点，在高端印刷产品质量控制中得到了广泛的应用。针对叠层纸张图像端面条纹检测难题，通过改进基于水平线方向引导增长的直线段提取算法，可以提高条纹识别的准确度和完整性，从而实现叠层数量的高精度测量。主要工作包括：引入单向梯度算子，消除同一条纹多重响应的问题；组合梯度幅值和水平线方向信息，并改善线支持区域增长；采用连接元分析，弥补条纹局部断裂异常。最后，通过大量不同类型印刷纸张的实际测量实验验证了算法性能。结果表明：长期测量误差小于0．75‰，完全可以满足工厂应用要求。
첩층지장수량검측시포장인쇄생산과정중중요적공예배절，기계수정도직접영향기업경제효익。기우궤기시각성상적계수방법구유비접촉、무물리손상、실시측량등우점，재고단인쇄산품질량공제중득도료엄범적응용。침대첩층지장도상단면조문검측난제，통과개진기우수평선방향인도증장적직선단제취산법，가이제고조문식별적준학도화완정성，종이실현첩층수량적고정도측량。주요공작포괄：인입단향제도산자，소제동일조문다중향응적문제；조합제도폭치화수평선방향신식，병개선선지지구역증장；채용련접원분석，미보조문국부단렬이상。최후，통과대량불동류형인쇄지장적실제측량실험험증료산법성능。결과표명：장기측량오차소우0．75‰，완전가이만족공엄응용요구。
Quantity measurement of stacked-sheet is an essential technical step in packaging and printing production process,and its counting accuracy has a direct impact on the economic efficiency of related companies.With its merits of noncontact,non-destructivity and real-time measurement,the counting method using machine vision imaging has been widely applied to quality control in high-end printing products.Aiming at the end face fringe detection problem in stacked-sheet images,it is able to improve the precision and completeness of fringe identification by improving the line-segment extraction algorithm which is based on guiding the growth along horizontal line direction,so as to realise the high accuracy measurement of stack quantity.Our work mainly consists of three parts:1 )Introducing the unidirectional gradient operator to eliminate the multiple responses on a single fringe;2)Combining the gradient magnitude and horizontal line direction, and improving the growth of line supported regions;3)Using connected element analysis to make up the anomaly of fringe’s partial rupture. At last,the performance of our algorithm is verified in experiments of actual measurements using a large number of various printed-papers. Results show that the long-term measurement error is less than 0.75‰ and it is sufficient to meet the requirement of factory applications.