用线阵 CCD 作为探测元件,对印张的十字线套印标记进行自动扫描。 采用交替处于 CCD 光敏面之前的红、绿、蓝 3 种滤色片来识别十字套准线的色彩,并根据加不同滤色片 CCD 输出电平的不同来判别 CMYK 印版的偏移方向。 实现了并行比较 A / D 变换电路对 CCD 输出电平进行 A / D 转换,并以代码形式在显示器上显示相应印版的套准误差及方向。

Sheet registration reticles were scanned automatically by detectors of linear array CCDs. The color of registration reticles was identified by red, green and blue filters arranged in turn on photosensitive surface of CCDs. Deviation direction of CMYK plates was recognized by CCD output level under different color filters. A / D conversion of CCD output level was realized with parallel comparison A / D conversion circuit. The registration error and deviation direction of detected plates were displayed on the screen directly.