opencv background substraction

Question

I have an image of the background scene and an image of the same scene with objects in front. Now I want to create a mask of the object in the foreground with background sub

Answer 1

I think when I'm doing it like this I get the right results: (in the YCrCb colorspace) but accessing each px is slow so I need to find another algorithm

    cv::Mat mask(image.rows, image.cols, CV_8U, cv::Scalar(0,0,0));

    cv::Mat_::const_iterator itImage= image.begin();
    cv::Mat_::const_iterator itend= image.end();
    cv::Mat_::iterator itRef= refRoi.begin();
    cv::Mat_::iterator itMask= mask.begin();

    for ( ; itImage!= itend; ++itImage, ++itRef, ++itMask) {
        int distance = abs((*itImage)[0]-(*itRef)[0])+
                        abs((*itImage)[1]-(*itRef)[1])+
                        abs((*itImage)[2]-(*itRef)[2]);

        if(distance < 30)
            *itMask = 0;
        else
            *itMask = 255;
    }