人脸检测

void CLookFace::detect_and_draw()
{
CvHaarClassifierCascade *pHaarClassCascade;
pHaarClassCascade = (CvHaarClassifierCascade*)cvLoad(pcascadeName);

//load the test image
IplImage *pSrcImage = cvLoadImage("D:\\24.jpg", CV_LOAD_IMAGE_UNCHANGED);
IplImage *pGrayImage = cvCreateImage(cvGetSize(pSrcImage), IPL_DEPTH_8U, 1);
if (pSrcImage == NULL || pGrayImage == NULL)
{
printf("can't load image!\n");
return;
}
cvCvtColor(pSrcImage, pGrayImage, CV_BGR2GRAY);

if (pHaarClassCascade != NULL && pSrcImage != NULL && pGrayImage != NULL)
{
const static CvScalar colors[] =
{
CV_RGB(0, 0, 255),
CV_RGB(0, 128, 255),
CV_RGB(0, 255, 255),
CV_RGB(0, 255, 0),
CV_RGB(255, 128, 0),
CV_RGB(255, 255, 0),
CV_RGB(255, 0, 0),
CV_RGB(255, 0, 255)
};

CvMemStorage *pcvMemStorage = cvCreateMemStorage(0);
cvClearMemStorage(pcvMemStorage);

//detect the face
int TimeStart, TimeEnd;
TimeStart = GetTickCount();
CvSeq *pcvSeqFaces = cvHaarDetectObjects(pGrayImage, pHaarClassCascade, pcvMemStorage);
TimeEnd = GetTickCount();

printf("the number of faces: %d\nSpending Time: %d ms\n", pcvSeqFaces->total, TimeEnd - TimeStart);

//mark the face
for (int i = 0; i <pcvSeqFaces->total; i++)
{
CvRect* r = (CvRect*)cvGetSeqElem(pcvSeqFaces, i);
CvPoint center;
int radius;
center.x = cvRound((r->x + r->width * 0.5));
center.y = cvRound((r->y + r->height * 0.5));
radius = cvRound((r->width + r->height) * 0.25);
cvCircle(pSrcImage, center, radius, colors[i % 8], 2);
}
cvReleaseMemStorage(&pcvMemStorage);
}

const char *pstrWindowsTitle = "FaceDetect Demo";
cvNamedWindow(pstrWindowsTitle, CV_WINDOW_AUTOSIZE);
cvShowImage(pstrWindowsTitle, pSrcImage);

cvWaitKey(0);

cvDestroyWindow(pstrWindowsTitle);
cvReleaseImage(&pSrcImage);
cvReleaseImage(&pGrayImage);

}