In recent years, words like "intelligent printing", "cloud printing", "intelligent printing", "printing industry 4.0" and "printing industry Internet" have flooded all kinds of media, making printers excited for a bright future and confused for not knowing how to start. Today, let's introduce the factors that affect the visual defect detection of printing machine.

1、设备波动造成的纸张蛇形跑动问题

1. Paper snaking caused by equipment fluctuation

在印刷过程中，随着张力和速度的波动，纸张在前进过程中会产生蛇形跑动现象，表现在运动方向的不同程度的拉伸，以及宽度方向的不同程度的偏移，给图像的采集和对比造成困难。

In the printing process, with the fluctuation of tension and speed, the paper will produce serpentine running phenomenon in the process of moving, which is manifested in different degrees of stretching in the direction of motion and different degrees of deviation in the width direction, which makes it difficult to collect and compare images.

2、检测后的处理问题

2. Problems after detection

检测只是质量管理的手段，检测的目的是为了指导生产，及时杜绝连续废品的发生;同时也应当为成品出厂提供判断依据。目前在这方面国内外多数在线检测系统均未提出较好的方案。

Testing is only a means of quality management, the purpose of testing is to guide production, timely eliminate the occurrence of continuous waste; at the same time, it should also provide judgment basis for the delivery of finished products. At present, most of the on-line detection systems at home and abroad have not put forward a better scheme.

3、印刷材质问题

3. Printing material problems

印刷材质除了常见的白卡纸、铜版纸外，还存在很大比例的转移纸(包括金银卡纸、镭射纸)，纸上除了印刷外，还有素面烫金、全息定位烫金等印后工艺，其强反射特性给普通照明条件下的检测带来难度;而且压凸图案由于低色差特性也给检测带来困难。

In addition to the common white cardboard and coated paper, there are also a large proportion of transfer paper (including gold and silver cardboard and laser paper). Besides printing, there are also plain surface gilding, holographic positioning gilding and other post printing processes on the paper. The strong reflection characteristics bring difficulties to the detection under ordinary lighting conditions; and the low chromatic aberration characteristics also bring difficulties to the detection of embossed patterns.

以上就是影响印刷机器视觉缺陷检测的因素，另外印刷机是绝大多数印刷企业的资产，印刷效率决定了大部分企业的效益。目前，在印刷环节，还存在大量时间浪费在调整套准、调整颜色、擦橡皮布、洗印版上的情况。

These are the factors that affect the visual defect detection of printing machine. In addition, printing machine is the asset center of most printing enterprises, and printing efficiency determines the benefits of most enterprises. At present, in the printing process, there is still a lot of time wasted in adjusting the registration, adjusting the color, rubbing the blanket and developing the printing plate.