FG模型

一直没搞懂CvBGStatModel和CvFGDStatModel有什么区别。CvBGStatModel模型的创建用cvCreateGaussianBGModel，CvFGDStatModel模型的创建用cvCreateFGDStatModel，它们的更新都用cvUpdateBGStatModel。

#include<iostream>
#include<opencv2/opencv.hpp>
#include<opencv/cvaux.hpp>
using namespace std;

int main()
{
    IplImage *pFrame=NULL;
    IplImage *pFrImg=NULL;
    IplImage *pBkImg=NULL;
    CvCapture *pCapture=NULL;
    pCapture= cvCreateFileCapture("video.avi");

    cvNamedWindow("video",1);
    cvNamedWindow("background",1);
    cvNamedWindow("foreground",1);
    cvMoveWindow("video",30,0);
    cvMoveWindow("background",450,0);
    cvMoveWindow("foreground",900,0);

   CvFGDStatModel* fg_model=NULL;

    int nFrmNum=0;
    while(pFrame=cvQueryFrame(pCapture))
    {
        nFrmNum++;
        if(nFrmNum==1)
        {
            pBkImg=cvCreateImage(cvSize(pFrame->width, pFrame->height),IPL_DEPTH_8U,3);
            pFrImg=cvCreateImage(cvSize(pFrame->width, pFrame->height),IPL_DEPTH_8U,3);
            fg_model = (CvFGDStatModel*)cvCreateFGDStatModel(pFrame, 0);

        }
        else
        {
           cvUpdateBGStatModel(pFrame, (CvBGStatModel *)fg_model );
            pFrImg=fg_model->foreground;
            cvDilate(pFrImg,pFrImg);
//            cvErode(pFrImg,pFrImg);//腐蚀
            pBkImg=fg_model->background;

            cvShowImage("video",pFrame);
            cvShowImage("background",pBkImg);
            cvShowImage("foreground",pFrImg);

        }

        if(cvWaitKey(20)>=0)
            break;
    }

    cvReleaseBGStatModel((CvBGStatModel**)&fg_model);
    cvDestroyAllWindows();
    cvReleaseImage(&pFrame);
    cvReleaseImage(&pFrImg);
    cvReleaseImage(&pBkImg);
    cvReleaseCapture(&pCapture);
    return 0;
}

程序运行结果：