However, the object function suffers from the local extremum induced by interpolation, which obstructs optimization algorithms and leads to the wrong result of registration.

• 但是当变换后像素坐标位于非采样网格点时，插值算法有时会使目标函数产生局部极值，使得最优化搜索终止于局部极值，得到错误的配准结果。