一种彩色印刷图像套印检测新方法研究

提出了一种印刷品检测方法,用印刷图像信息取代套印控制条来检测套准。首先,把CCD采集到的印刷品图像从RGB色彩空间转换到CMYK色彩空间,并分解成C、M、Y、K(青、品、黄、黑)4个通道。之后求出C、M、Y、K通道图像的边缘,计算C、M、Y边缘图像和基准K边缘图像的距离边缘共生矩阵(distance edge cooccurrence matrix,DECM),即可求出四色套印偏差。通过仿真和实验证明本算法检测印刷品套准具有较高的精度,符合国家印刷行业标准规定的套准精度要求。为印刷机的工作状态的调整提供可靠的数据。

A New Method for Detecting Color Printing Image Registration Error

In this paper,we present a new printing image registration error detection method based on the DECM(Distant Edge Co-occurrence Matrix).We use printing image information to register errors.Firstly,we collect a printing image with the CCD camera and convert it from RGB color space to CMYK color space.Secondly,we separate the image into C,M,Y,K color channels and obtain the edge image of each channel.We calculate the translation distance between detecting the edge images(C,M,Y) and the reference edge image(K).The method proposed in this paper can easily compute the four-color overprint deviation.The simulation results and experimental results have good agreement,indicating that the method is correct and effective.