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新手小白请原谅。看了一下教程，frame_difference应该是可以做的。但是我想有没有更简单的，就是如何得到上一帧blob的坐标信息，这个可以计算每两帧之间的速度变化。请问可行吗？
可行，直接保存到全局变量里，做减法。