基于Freeman 链码的直线识别方法，该文将Freeman 针对直线编码提出的3 个约束条件应用到直线的识别之中，取得了较好的效果。

通过两次直线段的合并操作较好地解决了短线段过多的问题-Freeman chain code based on the linear identification method, the paper will propose Freeman coding for the three linear constraints being applied to the line identification, to obtain good results. Straight line through the merger of two operating segments to better solve the problem of excessive short-term