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Firstly this paper discusses drawbacks of traditional adjacent frame difference motion detection method. Then we propose to restore video sequence background using image energy, higher order statistics theory, plus some background constrains criteria. Lastly, instead of using adjacent frame difference method, background based difference is used to detect moving regions. Our tests indicate the proposed method is more precise, and is independent of the speed of the moving target. The method is extremely useful for the scenarios where moving targets are in high mobility.