2) Directly laser marking experiment: The experiment of tool mark identification is based on the single factor experimentation, which is used for confirming the best parameter of 1D bar code and 2D bar code.

• 2) 激光直接标识实验 为了确定一维和二维条码的最佳标刻参数，本文基于单因子实验法进行标识实验，并在对实验结果进行统计分析的基础上设定出标刻和识读的最佳参数。