Return motion from webcam as a number?

edited April 2014 in How To...

Hi, I am trying to figure out how to use the webcam to detect motion, but I want to be able to detect the amount of motion in order to determine the Y position of something (i.e lots of motion: y position goes up, little or no motion: y position goes down and remains steady). If anyone could point me in the right direction that would be great!

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