背景建模檢測

#include <stdio.h>
#include <cv.h>
#include <highgui.h>

int main( int argc, char** argv )
{
  //聲明IplImage指針
  IplImage* pFrame = NULL; 
  IplImage* pFrImg = NULL;
  IplImage* pBkImg = NULL;

  CvMat* pFrameMat = NULL;
  CvMat* pFrMat = NULL;
  CvMat* pBkMat = NULL;
  
  CvCapture* pCapture = NULL;
  //pCapture = cvCreateFileCapture("video.avi"); 
  pCapture = cvCreateFileCapture("seq-320-240.avi"); 
  int nFrmNum = 0;

  //創建窗口
  cvNamedWindow("video", 1);
  cvNamedWindow("background",1);
  cvNamedWindow("foreground",1);
  //使窗口有序排列
  cvMoveWindow("video", 30, 0);
  cvMoveWindow("background", 360, 0);
  cvMoveWindow("foreground", 690, 0);

  //if( argc != 2 )
  //  {
  //    fprintf(stderr, "Usage: bkgrd <video_file_name>\n");
  //    return -1;
  //  }

  ////打開視頻文件
  //if( !(pCapture = cvCaptureFromFile(argv[1])))
  //  {
  //    fprintf(stderr, "Can not open video file %s\n", argv[1]);
  //    return -2;
  //  }
  
  //逐幀讀取視頻
  	while(pFrame = cvQueryFrame( pCapture ))
    {
      	nFrmNum++;
      
      	//如果是第一幀，需要申請內存，並初始化
      	if(nFrmNum == 1)
		{
	  		pBkImg = cvCreateImage(cvSize(pFrame->width, pFrame->height),
  	IPL_DEPTH_8U,1);
	  		pFrImg = cvCreateImage(cvSize(pFrame->width, pFrame->height),  
IPL_DEPTH_8U,1);
pBkMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);
	  		pFrMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);
	  		pFrameMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);

	  		//轉化成單通道圖像再處理
	  		cvCvtColor(pFrame, pBkImg, CV_BGR2GRAY);
	  		cvCvtColor(pFrame, pFrImg, CV_BGR2GRAY);

	  		cvConvert(pFrImg, pFrameMat);
	  		cvConvert(pFrImg, pFrMat);
	  		cvConvert(pFrImg, pBkMat);
		}
      	else
		{
	  		cvCvtColor(pFrame, pFrImg, CV_BGR2GRAY);
	  		cvConvert(pFrImg, pFrameMat);
	  		//先做高斯濾波，以平滑圖像
	  		//cvSmooth(pFrameMat, pFrameMat, CV_GAUSSIAN, 3, 0, 0);
	  
	  		//當前幀跟背景圖相減
	  		cvAbsDiff(pFrameMat, pBkMat, pFrMat);

	  		//二值化前景圖
	  		cvThreshold(pFrMat, pFrImg, 60, 255.0, CV_THRESH_BINARY);

	  		//進行形態學濾波，去掉噪音  
	 		//cvErode(pFrImg, pFrImg, 0, 1);
	  		//cvDilate(pFrImg, pFrImg, 0, 1);

	  		//更新背景
	  		cvRunningAvg(pFrameMat, pBkMat, 0.003, 0);
	  		//將背景轉化爲圖像格式，用以顯示
	  		cvConvert(pBkMat, pBkImg);

	  		//顯示圖像
	  		cvShowImage("video", pFrame);
	  		cvShowImage("background", pBkImg);
	  		cvShowImage("foreground", pFrImg);

	  		//如果有按鍵事件，則跳出循環
	  		//此等待也爲cvShowImage函數提供時間完成顯示
	  		//等待時間可以根據CPU速度調整
	  		if( cvWaitKey(2) >= 0 )
	    		break;
		}  // end of if-else
    } // end of while-loop

  	//銷燬窗口
  	cvDestroyWindow("video");
  	cvDestroyWindow("background");
  	cvDestroyWindow("foreground");

  	//釋放圖像和矩陣
  	cvReleaseImage(&pFrImg);
  	cvReleaseImage(&pBkImg);

  	cvReleaseMat(&pFrameMat);
  	cvReleaseMat(&pFrMat);
  	cvReleaseMat(&pBkMat);

  	return 0;
}