| /**
* Display video from webcam and detect faces
*/
#include <stdio.h>
#include <opencv/cv.h>
#include <opencv/highgui.h>
CvHaarClassifierCascade *cascade;
CvMemStorage *storage;
void detectFaces( IplImage *img );
int main( int argc, char** argv )
{
CvCapture *capture;
IplImage *frame;
int key;
char *filename = "haarcascade_frontalface_alt.xml";
/* load the classifier
note that I put the file in the same directory with
this code */
cascade = ( CvHaarClassifierCascade* )cvLoad( filename, 0, 0, 0 );
/* setup memory buffer; needed by the face detector */
storage = cvCreateMemStorage( 0 );
/* initialize camera */
capture = cvCaptureFromCAM( 0 );
/* always check */
assert( cascade && storage && capture );
/* create a window */
cvNamedWindow( "video", 1 );
while( key != 'q' ) {
/* get a frame */
frame = cvQueryFrame( capture );
/* always check */
if( !frame ) break;
/* 'fix' frame */
// cvFlip( frame, frame, -1 );
frame->origin = 0;
/* detect faces and display video */
detectFaces( frame );
/* quit if user press 'q' */
key = cvWaitKey( 10 );
}
/* free memory */
cvReleaseCapture( &capture );
cvDestroyWindow( "video" );
cvReleaseHaarClassifierCascade( &cascade );
cvReleaseMemStorage( &storage );
return 0;
}
void detectFaces( IplImage *img )
{
int i;
/* detect faces */
CvSeq *faces = cvHaarDetectObjects(
img,
cascade,
storage,
1.1,
3,
0 /*CV_HAAR_DO_CANNY_PRUNNING*/,
cvSize( 40, 40 ) );
/* for each face found, draw a red box */
for( i = 0 ; i < ( faces ? faces->total : 0 ) ; i++ ) {
CvRect *r = ( CvRect* )cvGetSeqElem( faces, i );
cvRectangle( img,
cvPoint( r->x, r->y ),
cvPoint( r->x + r->width, r->y + r->height ),
CV_RGB( 255, 0, 0 ), 1, 8, 0 );
}
/* display video */
cvShowImage( "video", img );
} |
haarcascade_frontalface_alt.zip
