图像匹配技术在套印误差自动检测中的应用

准确检测套印偏差是印刷机自动套印系统中最为关键的技术;针对印刷色标图案的特点,提出了一种新的基于图像匹配的套印误差检测方法,通过相关匹配处理获取各单色色标的位置,并巧妙利用色标圆线的直径确定了系统的标称分辨率,进而计算出各色组问纵向和横向的套印误差;文中详细给出了算法原理和实验结果;相对于经典的边缘检测方法,图像匹配技术充分利用了色标图案的整体信息;实验结果表明,该方法对像素灰度的变化和系统噪声具有鲁棒性,检测精度高。

Application of Image Matching Technology in Automatic Detecting Printing Registration Deviation

Detecting registration deviation accurately plays an important role in the automatic overprint control system.A new method based on image matching for detecting printing registration deviation is presented according to the feature of printing color mark image,the position of each single color mark is acquired with correlation matching;Meanwhile,the system's nominal resolution is determined by the di- ameter of mark circle,then the horizontal and vertical registration deviations are measured.The algorithm is described in particular and the experiment is implemented.Comparing with basic edge detection methods,Image Matching Technology can fully take use of whole color mark.The experimental result shows that the new method is robust to the transformation of pixel grey value and the noise of the image sys- tem,and has high detecting precision.