印刷全画面检测图像定位辅助标记研究

目的研究基于全画面检测系统图像的定位辅助标记及其选用原则。方法制作四色油墨的渐变印刷样条,用分光密度计测试密度值,然后扫描输出RGB值,研究不同颜色辅助标记在不同密度值下,对CCD图像传感器RGB响应值的影响规律,并推导出图像定位边界特征显著性描述的相关公式。结果黄色、青色、品红色油墨分别与CCD相机的蓝色、红色、绿色响应呈良好的补色关系,黑色油墨与CCD相机的蓝色、红色、绿色响应呈良好的中性关系;补色通道上的标记响应与主体图像的响应反差较大,其定位边界显著性更突出。结论一般情况下,选择与主色调呈补色关系的单色油墨作为定位辅助标记,当主色调较难分辨时,可考虑使用较为通用的黑色标记。

Auxiliary Marker of Image Location for Print Whole Image Detection System

The aim of this work was to study the auxiliary marker of image location and its selection principle based on print whole image detection system. Bar specimens of four-color ink printing with density gradient were prepared. The density was tested using spectrodensiotometer, followed by scanning and output of RGB value. The influence law of different color auxiliary marker on the RGB response values of CCD image sensor under different density values was studied, and the relevant formula was deduced for describing the significance of image location boundary feature. It was found that yellow, cyan, magenta ink had a good complementary relationship respectively with blue, red, green response of CCD camera, while black ink had a good neutral relationship with these colors. The auxiliary marker response of complementary color channel was quite different from that of the body image, and its positioning boundary significance was more prominent. In conclusion, as a general rule, monochromatic color ink of complementary relationship with the main color should be chosen as the auxiliary marker of image location. When the main color is difficult to distinguish, a general black marker can be considered.