曲面拟合函数，实验数据文件master_slave_cut.diff_unw’是解缠后的干涉图master_slave_cut.diff_unw’是真实形变区域的掩模文件-Surface fitting function, the experimental data file master_slave_cut.diff_unw ' is unwrapping the interferogram master_slave_cut.diff_unw after' is true def