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