Best algorithm for motion detection? [closed] - matlab

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I wonder what is the best algorithm for motion detection of human subjects. Keeping in mind that the motion is detected for moving objects with tolerance of leaving out minor changes to the environment. Matlab/OpenCV sources would be great!
Thanks

A long time back i saw this page, where you can see the code of the thesis and the thesis of "A real-world system for human motion detection and tracking" maybe this can help you.
Thesis David Moore
This could to be a good point to begin.

Check out:
www.ensta-paristech.fr/~manzaner/Publis/icvgip04.pdf

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