Background subtraction

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Hi!

Can anyone suggest me a fast way of getting the four-ground image?

Currently i am using BackgroundSubtractorMOG2 class to do this. it is very slow. and my task doesn't need that much complex algorithm.

i can get a image of the background in the binging. camera position will not change. so i believe that there is a easy way to do this.

i need to capture a blob of the object moving in front of the camera. and there will be only one object always.

thank you