#include <stdio.h>
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
int main( int argc, char** argv )
{
//声明IplImage指针
IplImage* pFrame = NULL;
IplImage* pFrImg = NULL;
IplImage* pBkImg = NULL;
CvMat* pFrameMat = NULL;
CvMat* pFrMat = NULL;
CvMat* pBkMat = NULL;
CvCapture* pCapture = NULL;
int nFrmNum = 0;
//创建窗口
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; }
//打开摄像头
if (argc ==1)
if( !(pCapture = cvCaptureFromCAM(-1))) //只有一个摄像头时为-1
{
fprintf(stderr, "Can not open camera./n"); return -2;
}
//打开视频文件
if(argc == 2)
if( !(pCapture = cvCaptureFromFile(argv[1])))
{
fprintf(stderr, "Can not open video file %s/n", argv[1]);
return -2;
}
//逐帧读取视频
while(pFrame = cvQueryFrame( pCapture )) //从摄像头或者文件中抓取并返回一帧
{
nFrmNum++;
//如果是第一帧,需要申请内存,并初始化
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); //分配矩阵 cvCreateMat(int rows,int cols, int type);
pFrMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);
pFrameMat = cvCreateMat(pFrame->height, pFrame->width, CV_32FC1);
//转化成单通道图像再处理
cvCvtColor(pFrame, pBkImg, CV_BGR2GRAY);
cvCvtColor(pFrame, pFrImg, CV_BGR2GRAY);
cvConvert(pFrImg, pFrameMat);//cvCvtColor一般是用来做不同depth图象之间的转换
cvConvert(pFrImg, pFrMat); //如8u的图象转换成32f的图象
cvConvert(pFrImg, pBkMat);
}
else
{
cvCvtColor(pFrame, pFrImg, CV_BGR2GRAY);//彩色空间转换cvCvtColor(src,dst,code) code:CV_RGB,BGR,GRAY,等等
cvConvert(pFrImg, pFrameMat);
//高斯滤波先,以平滑图像//
cvSmooth(pFrameMat, pFrameMat, CV_GAUSSIAN, 3, 0, 0);
//当前帧跟背景图相减
cvAbsDiff(pFrameMat, pBkMat, pFrMat);
//二值化前景图
cvThreshold(pFrMat, pFrImg, 60, 255.0, CV_THRESH_BINARY);
//进行形态学滤波,去掉噪音 //
cvErode(pFrImg, pFrImg, 0, 1); //
cvDilate(pFrImg, pFrImg, 0, 1);
//更新背景
cvRunningAvg(pFrameMat, pBkMat, 0.003, 0);
//将背景转化为图像格式,用以显示
cvConvert(pBkMat, pBkImg);
//显示图像
cvShowImage("video", pFrame);
cvShowImage("background", pBkImg);
cvShowImage("foreground", pFrImg);
//如果有按键事件,则跳出循环 //此等待也为cvShowImage函数提供时间完成显示
//等待时间可以根据CPU速度调整
if( cvWaitKey(2) >= 0 )
break;
}
}
//销毁窗口
cvDestroyWindow("video");
cvDestroyWindow("background");
cvDestroyWindow("foreground");
//释放图像和矩阵
cvReleaseImage(&pFrImg);
cvReleaseImage(&pBkImg);
cvReleaseMat(&pFrameMat);
cvReleaseMat(&pFrMat);
cvReleaseMat(&pBkMat);
cvReleaseCapture(&pCapture);
return 0;
}