在此给出的是利用基于模板匹配和GVF的BSnake算法准自动提取面状道路的主要函数，程序执行的流程就是按照下面函数的调用顺序依次进行的。试验只需人工在每条道路上选取两个接近的种子点，便可自动提取这条道路。

Packet : 主要函数代码（遥感影像上面状道路的准自动提取算法）.txt filelist

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