relative extremum的用法和樣例：
例句
- However, the object function suffers from the local extremum induced by interpolation, which obstructs optimization algorithms and leads to the wrong result of registration.
但是當變換后像素坐標位于非采樣網(wǎng)格點(diǎn)時(shí)，插值算法有時(shí)會(huì )使目標函數產(chǎn)生局部極值，使得最優(yōu)化搜索終止于局部極值，得到錯誤的配準結果。
