根据锁相环的原理，使用反射式光电传感器实现了系统的颜色识别。
According to the theory of phase-locked loop, we use reflected photoelectric sensor to carry out the color recognition.
前言： 《 建筑涂料色卡》是继《 漆膜颜色标准样卡》之后的又一项涂料色卡标准。简述了该标准的设计原理、标准结构、制作工艺和使用方法。
"Archtectural Coatings Color Card" is another coatings color card standard after Film Color Standard Sample Card, the design principle, structure, fabrication process and usage are sketched.
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