错误：无法在Qt Opencv中分配抽象类型的对象

Question

我正在进行简单的背景减法。这是我的代码

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/video/background_segm.hpp>

using namespace cv;
using namespace std;

//global variables
int history = 1;
float varThreshold = 16;
bool bShadowDetection = true;

Mat src; //source image
Mat fgMaskMOG2; //fg mask generated by MOG2 method
Ptr<BackgroundSubtractor> pMOG2; //MOG2 Background subtractor

int main(int argc, char* argv[])
{
    //create GUI windows
    namedWindow("Source");
    namedWindow("FG Mask MOG 2");

    src = imread("bluePaper1.png", 1);

    //create Background Subtractor objects
    pMOG2 = new BackgroundSubtractorMOG2(history, varThreshold, bShadowDetection); //MOG2 approach
    pMOG2->setInt("nmixtures", 3);
    pMOG2->setDouble("fTau", 0.5);

    pMOG2->operator()(src, fgMaskMOG2);

    imshow("Source", src);
    imshow("FG Mask MOG 2", fgMaskMOG2);

    waitKey(0);

    return 0;
}

但是我收到了错误

  

无法分配抽象类型'cv :: BackgroundSubtractorMOG2'

的对象

在第pMOG2 = new BackgroundSubtractorMOG2(history, varThreshold, bShadowDetection); //MOG2 approach行