基于统计阈值法的凹版印刷质量检测技术研究-制浆造纸工程(印刷工程)专业论文.docxVIP

西安理工大学硕士学位论文Title：STUDY 西安理工大学硕士学位论文 Title：STUDY ON QUALITY INSPECTION TECHNIQUE FOR GRAVURE PRINTING BASED ON THE S．rlATISTlCAL THRESHOLD METHOD Major：Printing Engineering Name：Yanyan GUAN Signature：纽竺鱼“驯 Supervisor：Prof．Xin LIU SignatureI＆滥 Abstract 了地lligII speed and automation are the developmental trend of gravure technology,and the printing quality inspection technique and rote arc the key factors of gravure development． Although many experts in interior and exterior have done plentiful researches and required many productions，tllere are still lots of defects which coul血’t be detected．A new method inspecting gravure printing quality was put forward for improving the inspection efficiency, reducing the wastage,saving the cost and achieving the progress control in this paper． The model of gravure quality inspection system based on statistical threshold method was established with the technology of digital image processing，and defects of gravure image could be detected．The peak out signal—to-noise was used to evaluate the effect of the noise process algorithms．According to the match fight probability and time，the image registration algorithm is selected．The workflow of defect inspection was designed on the base of inspection demand． The variance analysis and histogram analysis were used to process experimental data。 Comparing with the five algorithms，the Gauss Filter Was chosen to wipe off noise．The match right probability and time of the three kinds of image registration algorithm weEe calculated。and the algorithm of twice integrate match with 1ligh match right probability and short time was selected．By analyzing image gray value fluctuation，the standard model image Was built and the gray threshold of each pixel Was gained．According to the workflow of defect inspection，the gravure quality inspection software was compiled to test and verify the statistical threshold methed． It has indicated：the peak out signal-to·noise of Gauss Filter was 28．89 dB，an