How Does Motion Detection Work?

Here is the scenario: license plate reader camera mounted on a thin pole that seems to move with the wind. I think the pole is actually rigid conduit. Not our doing. (we tend to use something a tad stronger than conduit for a pole...) The camera is connected to Milestone license plate recognition software. When the camera moves, the software tries to read the ground, and we get hundreds of false reads.

I assume motion is based on pixels changing. Since the entire camera is moving, every pixel is changing. My first thought was to adjust sensitivity but after thinking about it, I wonder if sensitivity adjustments would do any good?

Is it based on how many pixels change, or how much they change?

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