OpenCv获取摄像头并显示摄像内容

转载自http://blog.youkuaiyun.com/augusdi/article/details/8762961

要做一个人脸识别与表情理解的系统，第一步先利用摄像头获取视频，看到这篇文章，受益匪浅。源代码在机器上运行不了，把代码改了一下，效果还不错

#include <opencv2\opencv.hpp>  
#include <iostream>
#include <highgui.h>
#include <cv.h>
#include <cxcore.h>

using namespace cv;

int main(int argc, char **argv)
{
	IplImage *pFrame = NULL;
	
	CvCapture  *pCapture = cvCreateCameraCapture(0);

	cvNamedWindow("video",1);

	while(1){
		pFrame = cvQueryFrame(pCapture);
		//if(!pFrame) break;
		cvShowImage("video",pFrame);
		char c = cvWaitKey(33);
		if(c == 27) break;
	}

	cvReleaseCapture(&pCapture);
	cvDestroyWindow("video");

}