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。