求翻译：Whilst optical flow systems vary in technique, they all try to solve the same essential problem which can be characterized as follows: given two functions F(x) and G(x) which are the respective pixel values at position x in the two images – for example a 5x5 window – the aim is to find the displacement vector h such th是什么意思？

待解决 悬赏分：1 - 离问题结束还有