我正在尝试编写一些简单的实时人脸检测代码,但不知何故它不起作用。(我在图像上尝试了面部检测代码并且它可以工作,但是使用下面的代码我在屏幕上得到一个灰色图像并且代码失败)
这是我尝试过的代码(它会打印“检测到面部!”一次到输出窗口)
CvHaarClassifierCascade *cascade;
CvMemStorage *storage;
char *face_cascade="haarcascade_frontalface_alt2.xml";
CvRect* r;
const CvArr* img_size;
IplImage *grayscale;
void detectFacialFeatures( IplImage *img)
{
grayscale = cvCreateImage(cvGetSize(img), 8, 1);
cvCvtColor(img, grayscale, CV_BGR2GRAY);
CvMemStorage* storage=cvCreateMemStorage(0);
cvClearMemStorage( storage );
cvEqualizeHist(grayscale, grayscale);
cascade = ( CvHaarClassifierCascade* )cvLoad( face_cascade, 0, 0, 0 );
CvSeq* faces = cvHaarDetectObjects(grayscale, cascade, storage, 1.1, 3, CV_HAAR_DO_CANNY_PRUNING, cvSize( 50, 50 ) );
if(faces)
{
printf("face detected!");
r = ( CvRect* )cvGetSeqElem( faces, 0 );
cvRectangle( img,cvPoint( r->x, r->y ),cvPoint( r->x + r->width, r->y + r->height ), CV_RGB( 255, 0, 0 ), 1, 8, 0 );
}
}
int _tmain(int argc, _TCHAR* argv[])
{
int c;
IplImage* color_img;
CvCapture* cv_cap = cvCreateCameraCapture(0);
cvSetCaptureProperty(cv_cap, CV_CAP_PROP_FRAME_WIDTH, 640);
cvSetCaptureProperty(cv_cap, CV_CAP_PROP_FRAME_HEIGHT, 480);
cvNamedWindow("Video",1); // create window
for(;;) {
color_img = cvQueryFrame(cv_cap); // get frame
if(color_img==0)
break;
cvFlip(color_img, 0, 1); //mirror image
detectFacialFeatures(color_img);
cvShowImage("Video", color_img); // show frame
c = cvWaitKey(10); // wait 10 ms or for key stroke
if(c == 27)
break; // if ESC, break and quit
}
/* clean up */
cvReleaseCapture( &cv_cap );
cvDestroyWindow("Video");
}