为了便于在matlab中调用susan算法的c实现函数，对Stephen Smith写的susan2.1 c源码进行简单编辑剪裁，并提供常用susan函数的matlab mex接口函数，使用者在matlab中简单编译后就能使用了。-Matlab in order to facilitate call susan algorithm realize the c function, written by Stephen Smith on susan2.1 c source code for simp