基于模板匹配的彩色印品套印偏差检测方法

A Method for Color Overprint Deviation Inspect Based on Template Matching

研究彩色印刷品套印偏差检测问题,可有效提高印刷品质量,但是传统的套印标识定位方法效率低、精度不高,无法满足工业需求。为解决上述问题,提出一种改进模板匹配的套印偏差检测算法。首先利用Canny边缘检测获取图像的边缘信息,根据定义的相似性度量,通过采用边缘方向的形状匹配定位出色标的候选位置,然后在候选位置的基础上再利用色标的颜色信息进行精确定位,在匹配过程中采用高斯金字塔分层搜索以及加速终止匹配策略大大提高算法速度。仿真结果表明:改进算法套印偏差自动检测的精度达到0.003mm,高于国家印刷行业标准规定的套印精度要求,而且满足工业印刷检测的实时性要求。

AThe paper researched the overprint deviation inspection for color printing to improve the quality of print. A new algorithm based on template matching was put forward. Firstly, Canny＇s edge detection method was used to get image edges, and the candidate region of color code was found by template matching the shapes along edge＇s direction according to the similarity measure. Secondly, the color information of candidate region was used to get accu- rate position, and Gaussian pyramid decomposition and acceleration termination matching strategies were adopted to improve speed of the algorithm in the process of template matching. Experimental results show that the precision of the algorithm reaches 0. 003 millimeter in the automatic inspection of overprint deviation inspection, and it is higher than overprint precision requirements of national printing industry standard and can meet the real - time requirement in the industrial printing inspection.