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1 | #include <cv.h> |
2 | #include <highgui.h> |
3 | #include <stdio.h> |
4 | |
5 | CvHaarClassifierCascade* load_object_detector( const char* cascade_path ) |
6 | { |
7 | return (CvHaarClassifierCascade*)cvLoad( cascade_path ); |
8 | } |
9 | |
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10 | void detect_and_draw_objects(IplImage* image, |
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11 | CvHaarClassifierCascade* cascade, |
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12 | int do_pyramids) |
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13 | { |
14 | IplImage* small_image = image; |
15 | CvMemStorage* storage = cvCreateMemStorage(0); |
16 | CvSeq* faces; |
17 | int i, scale = 1; |
18 | |
19 | /* if the flag is specified, down-scale the input image to get a |
20 | performance boost w/o loosing quality (perhaps) */ |
21 | if( do_pyramids ) |
22 | { |
23 | small_image = cvCreateImage( cvSize(image->width/2,image->height/2), IPL_DEPTH_8U, 3 ); |
24 | cvPyrDown( image, small_image, CV_GAUSSIAN_5x5 ); |
25 | scale = 2; |
26 | } |
27 | |
28 | /* use the fastest variant */ |
29 | faces = cvHaarDetectObjects( small_image, cascade, storage, 1.2, 2, CV_HAAR_DO_CANNY_PRUNING ); |
30 | |
31 | /* draw all the rectangles */ |
32 | for( i = 0; i < faces->total; i++ ) |
33 | { |
34 | /* extract the rectangles only */ |
35 | //CvRect face_rect = *(CvRect*)cvGetSeqElem( faces, i, 0 ); |
36 | CvRect face_rect = *(CvRect*)cvGetSeqElem( faces, i); |
37 | cvRectangle( image, cvPoint(face_rect.x*scale,face_rect.y*scale), |
38 | cvPoint((face_rect.x+face_rect.width)*scale, |
39 | (face_rect.y+face_rect.height)*scale), |
40 | CV_RGB(255,0,0), 3 ); |
41 | } |
42 | |
43 | if( small_image != image ) |
44 | cvReleaseImage( &small_image ); |
45 | cvReleaseMemStorage( &storage ); |
46 | } |
47 | |
48 | // A Simple Camera Capture Framework |
49 | int main( int argc, char** argv ) |
50 | { |
51 | CvHaarClassifierCascade* cascade = load_object_detector(argv[1]); |
52 | |
53 | CvCapture* capture = cvCaptureFromCAM( CV_CAP_ANY ); |
54 | if( !capture ) { |
55 | fprintf( stderr, "ERROR: capture is NULL \n" ); |
56 | getchar(); |
57 | return -1; |
58 | } |
59 | |
60 | // Create a window in which the captured images will be presented |
61 | cvNamedWindow( "mywindow", CV_WINDOW_AUTOSIZE ); |
62 | |
63 | // Show the image captured from the camera in the window and repeat |
64 | while( 1 ) { |
65 | // Get one frame |
66 | IplImage* frame = cvQueryFrame( capture ); |
67 | if( !frame ) { |
68 | fprintf( stderr, "ERROR: frame is null...\n" ); |
69 | getchar(); |
70 | break; |
71 | } |
72 | |
73 | detect_and_draw_objects( frame, cascade, 1 ); |
74 | cvShowImage( "mywindow", frame ); |
75 | // Do not release the frame! |
76 | |
77 | //If ESC key pressed, Key=0x10001B under OpenCV 0.9.7(linux version), |
78 | //remove higher bits using AND operator |
79 | if( (cvWaitKey(10) & 255) == 27 ) break; |
80 | } |
81 | |
82 | // Release the capture device housekeeping |
83 | cvReleaseCapture( &capture ); |
84 | cvDestroyWindow( "mywindow" ); |
85 | return 0; |
86 | } |