OpenCV摄像头人脸识别

注：

从外设摄像装置中获取图像帧，把每帧的图片与人脸特征进行匹配，用方框框住识别出来的人脸

需要用到的函数：

CvHaarClassifierCascade* cvLoadHaarClassifierCascade( const char* directory, CvSize orig_window_size );

第一个参数：训练好的级联分类器的路径

第二个参数：级联分类器训练中采用的检测目标的尺寸

#include "stdafx.h"
#include "iostream"
using namespace std;
#include "opencv2/opencv.hpp"
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
#include "Windows.h"
void main()
{

    IplImage *pFrame = NULL;
    IplImage *pGrayImg = NULL;

    //加载Haar特征检测分类器
    const char *pCascadeFileName = "E:/C_VC_code/opencv/haarcascade_frontalface_alt2.xml";
    //CvHaarClassifierCascade *pHaarCascade  = (CvHaarClassifierCascade*)cvLoad(pCascadeFileName);
    CvHaarClassifierCascade *pHaarCascade  = cvLoadHaarClassifierCascade(pCascadeFileName,cvSize(,));  

    CvCapture *pCapture = cvCreateCameraCapture(); //获取摄像头
    cout<< "加载成功..." <<endl;
    int nFrmNum = ;

    if(!pCapture)
    {
        cout<<"加载失败..."<<endl;
        return ;
    }
    //create window
    cvNamedWindow("Video",);

    CvMemStorage *pcvMStorage;
    CvSeq *pCvSeq;

    while(pFrame = cvQueryFrame(pCapture))    //逐帧读取
    {
        pGrayImg = cvCreateImage(cvGetSize(pFrame), IPL_DEPTH_8U, );
        cvCvtColor(pFrame, pGrayImg, CV_BGR2GRAY);  

        //---------------人脸识别-------------------------
        if (pHaarCascade != NULL)
        {
            pcvMStorage = cvCreateMemStorage();
            cvClearMemStorage(pcvMStorage);

            // 识别
            pCvSeq = cvHaarDetectObjects(pGrayImg, pHaarCascade, pcvMStorage);   

            // 标记
            for(int i = ; i <pCvSeq->total; i++)
            {
                CvRect* r = (CvRect*)cvGetSeqElem(pCvSeq, i);
                CvPoint pt[];
                pt[] = cvPoint(r->x,r->y);
                pt[] = cvPoint(r->x+r->width,r->y);
                pt[] = cvPoint(r->x+r->width,r->y+r->height);
                pt[] = cvPoint(r->x,r->y+r->height);
                CvPoint* ppt=pt;
                int count=;
                cvPolyLine( pFrame, &ppt,&count,,,CV_RGB(,,),);//画矩形
            }  

            cvReleaseMemStorage(&pcvMStorage);
        }  

        cvShowImage("Video",pFrame);
        //---------------人脸识别-------------------------
        char c = cvWaitKey();    //按esc退出
        if(c==)
        {
            cvDestroyWindow("Video");
            cvReleaseImage(&pFrame);
            cvReleaseImage(&pGrayImg);
            return;
        }
    }
}