X axis and Y axis electric moving stages are driven to track object based on its position which is calculated by improved 3 frame difference algorithm.

通过改进的三帧差分法计算运动目标的位置，控制X、Y轴电动位移台跟踪目标。

youdao

I take the difference in the x-values, squared, the difference in the y-values, squared, add them up, take the square root of that.

好，是毕达哥拉斯定力对不对？,求x坐标的差，然后平方，求y坐标的差，然后平方，把它们加起来，开平方。

麻省理工公开课 - 计算机科学及编程导论课程节选