印刷过程中，张力变化范围小，套印精度就容易控制。
Printing process in tension variety the scope may be small, the set print accuracy easily controlled.
彩色印刷过程中，人工检测套印误差是一项费时且低效的工作。
In color printing, detecting printing registration deviation by man is time-consuming and inefficient.
检测并控制制版印刷过程中的网点面积（率），是提高印刷质量的重要课题。
To measure and control the dot area in plate-making and printing process is an important subject to improve print quality.
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