Plastics are usually marked with an identification code that shows a recycling symbol and a number from 1 to 7.

塑料通常标有一个标识码，上面有一个回收符号和一个从1到7的数字。

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This peper points out that usual identification flame has three types: symbol set, ordered statement set and closed interval of real number.

本文指出常用辨识框可分为符号集合型、有序命题集合型和实数闭区间型。

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To improve the efficiency of symbolic recognition and enhance the robustness of identification methods, a symbol recognition method based on the characteristics of the centroid is presented.

为提高面结构光检测中符号识别效率和增强识别方法的鲁棒性，提出了一种基于形心特征面结构光符号识别方法。

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