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BackgroundsubtractorMOG2 result is not satisfactory.

I am using open cv to perform background subtraction. where i want to remove all moving objects from sequence of images. But at the end result image still contain some moving object. My code is below. Please suggest me how i can do it. thanks.

cv::Mat fgMaskMOG2;
cv::BackgroundSubtractorMOG2 pMOG2=cv::BackgroundSubtractorMOG2();

int i=1;
while (i<3) {
    NSString *path=[[NSBundle mainBundle]pathForResource:[NSString stringWithFormat:@"IMG_%d",i] ofType:@"JPG"];
   cv::Mat frame =cv::imread([path UTF8String]);
    pMOG2.operator()(frame, fgMaskMOG2);
    i++;![image description](http://)
}
cv::Mat output;
pMOG2.getBackgroundImage(output);
UIImage *imge=[self UIImageFromCVMat:fgMaskMOG2];
UIImage *imge2=[self UIImageFromCVMat:output];

Here are images which i am processing. image description Here is result which i am getting.