原创 Opencv打开摄像头例子

#include "stdafx.h"
#include "highgui.h"
#include "cxcore.h"
int _tmain(int argc, char * argv[])
{
 CvCapture* capture = 0;//视频流捕获
 if(argc == 1 || (argc == 2 && strlen(argv[1]) == 1 && isdigit(argv[1][0])))
  capture = cvCaptureFromCAM(argc == 2 ? argv[1][0] - '0' : 0);//从摄像头获得视频流
 else if( argc == 2 )
  capture = cvCaptureFromAVI(argv[1]);//从文件获得视频流
 if(!capture)
   return 0;
 IplImage *current_frame_rgb = cvCreateImage(cvSize(320, 240), IPL_DEPTH_16U, 3);
 cvNamedWindow("Window 0", 0);
 while(capture)
 {
  current_frame_rgb = cvQueryFrame(capture);//获得一帧图象
  cvShowImage("Window 0",current_frame_rgb);
  if(cvWaitKey(1)==27)//等待ESC键
   break;
 }
 cvDestroyAllWindows();              
}