# 算法

## 质心算法

In physics, the center of mass of a distribution of mass in space is the unique point where the weighted relative position of the distributed mass sums to zero, or the point where if a force is applied it moves in the direction of the force without rotating.——Center of mass wiki

## 数值微分滤波

2阶形式为$g_2(x) = f(x-1) -f(x+1)$，这些滤波器的表现与数值微分滤波器相似。

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