A rapid side-to-side shaking motion is easily detected because, although the movements are relatively small, the accelerations are large enough for useful gesture acquisition.

可以很容易地检测到一次快速摇动，这是因为，尽管移动幅度相对较小，但是加速度比较大，足以捕捉到有用的动作。

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This system detected motion target using difference image method through threshold image segmentation, then automatically tracked target by using centroid tracking algorithm.

该系统运用差分图像法，通过阈值图像分割来检测运动目标，并采用形心跟踪算法来自动跟踪目标。

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Start recording when motion is detected.

开始录制时检测到运动。

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The app also provides email alerts, notifying you when motion is detected and sending you a snapshot of the motion in full HD.

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It works over a phone line and will capture images when motion is detected, without recording inactivity between events.

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And could it be trout farming below the dam at Dolores square plastic-lined pools in which writhing motion could be detected, as if someone were boiling a great stew of fish rather than breeding them?

NEWYORKER: Or Else