Now we have a motion-tracking function that is run for every frame of video that comes in. Let's retrieve the coordinates and draw a blue circle where there is motion.

现在有了一个运动跟踪函数，对于视频的每一帧都会运行它。

youdao

Anything you can do with an SDL Surface you can now do with your motion-tracked blue dot example.

可以用SDL Surface实现的任何事情，现在都可以用跟踪运动的蓝色圆示例来实现。

youdao

MEPs on the European Parliament's Environment Committee have tabled a motion calling for a ban on trade in blue fin tuna and polar bears.

BBC: Endangered species debate

He also noted in a patent filing that the process allowed the blue-screen procedure to cope with glassware, cigarette smoke, blowing hair and motion blur which had all caused problems for earlier efforts.

BBC: Blue and green-screen effects pioneer Petro Vlahos dies

If they wanted to make Superman appear to be flying, they would film Reeve against blue screens and zoom the camera in and out around him to simulate the actor in motion.

FORBES: Magazine Article