Here we compute optical flow for a short clip of this dog fetching a water bottle on a beach.

在这里，我们计算了这只狗在海滩上取水瓶的短片的光流。

We trained a vision algorithm on those feeds based on a technique called " optical flow, " to analyze the collective density, direction, dwell and velocity states of urban movement.

基于一种“光流技术”，我们训练了一种视觉算法，来分析收集到的人流密度，城市流动的方向，速度状态以及居住方式。