Based on particle filters, a head elliptical contour tracking method applicable to complex background, large distance range and arbitrary pose is proposed in this paper.

结合粒子滤波思想，给出了一种适用于复杂背景和较远距离下跟踪任意姿态人体头部椭圆轮廓的方法。

youdao

Let's ask, what's the range? Range is that distance.

那么射程是多少,射程就是这个距离

耶鲁公开课 - 基础物理课程节选

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