"\tc - stop the tracking\n"
"\tb - switch to/from backprojection view\n"
"\th - show/hide object histogram\n"
+ "\tp - pause video\n"
"To initialize tracking, select the object with mouse\n" << endl;
}
help();
- namedWindow( "Histogram", 1 );
- namedWindow( "CamShift Demo", 1 );
+ namedWindow( "Histogram", 0 );
+ namedWindow( "CamShift Demo", 0 );
setMouseCallback( "CamShift Demo", onMouse, 0 );
createTrackbar( "Vmin", "CamShift Demo", &vmin, 256, 0 );
createTrackbar( "Vmax", "CamShift Demo", &vmax, 256, 0 );
createTrackbar( "Smin", "CamShift Demo", &smin, 256, 0 );
- Mat hsv, hue, mask, hist, histimg = Mat::zeros(200, 320, CV_8UC3), backproj;
+ Mat frame, hsv, hue, mask, hist, histimg = Mat::zeros(200, 320, CV_8UC3), backproj;
+ bool paused = false;
for(;;)
{
- Mat frame;
- cap >> frame;
- if( frame.empty() )
- break;
+ if( !paused )
+ {
+ cap >> frame;
+ if( frame.empty() )
+ break;
+ }
frame.copyTo(image);
- cvtColor(image, hsv, CV_BGR2HSV);
-
- if( trackObject )
+
+ if( !paused )
{
- int _vmin = vmin, _vmax = vmax;
+ cvtColor(image, hsv, CV_BGR2HSV);
- inRange(hsv, Scalar(0, smin, MIN(_vmin,_vmax)),
- Scalar(180, 256, MAX(_vmin, _vmax)), mask);
- int ch[] = {0, 0};
- hue.create(hsv.size(), hsv.depth());
- mixChannels(&hsv, 1, &hue, 1, ch, 1);
-
- if( trackObject < 0 )
+ if( trackObject )
{
- Mat roi(hue, selection), maskroi(mask, selection);
- calcHist(&roi, 1, 0, maskroi, hist, 1, &hsize, &phranges);
- normalize(hist, hist, 0, 255, CV_MINMAX);
-
- trackWindow = selection;
- trackObject = 1;
-
- histimg = Scalar::all(0);
- int binW = histimg.cols / hsize;
- Mat buf(1, hsize, CV_8UC3);
- for( int i = 0; i < hsize; i++ )
- buf.at<Vec3b>(i) = Vec3b(saturate_cast<uchar>(i*180./hsize), 255, 255);
- cvtColor(buf, buf, CV_HSV2BGR);
-
- for( int i = 0; i < hsize; i++ )
+ int _vmin = vmin, _vmax = vmax;
+
+ inRange(hsv, Scalar(0, smin, MIN(_vmin,_vmax)),
+ Scalar(180, 256, MAX(_vmin, _vmax)), mask);
+ int ch[] = {0, 0};
+ hue.create(hsv.size(), hsv.depth());
+ mixChannels(&hsv, 1, &hue, 1, ch, 1);
+
+ if( trackObject < 0 )
{
- int val = saturate_cast<int>(hist.at<float>(i)*histimg.rows/255);
- rectangle( histimg, Point(i*binW,histimg.rows),
- Point((i+1)*binW,histimg.rows - val),
- Scalar(buf.at<Vec3b>(i)), -1, 8 );
+ Mat roi(hue, selection), maskroi(mask, selection);
+ calcHist(&roi, 1, 0, maskroi, hist, 1, &hsize, &phranges);
+ normalize(hist, hist, 0, 255, CV_MINMAX);
+
+ trackWindow = selection;
+ trackObject = 1;
+
+ histimg = Scalar::all(0);
+ int binW = histimg.cols / hsize;
+ Mat buf(1, hsize, CV_8UC3);
+ for( int i = 0; i < hsize; i++ )
+ buf.at<Vec3b>(i) = Vec3b(saturate_cast<uchar>(i*180./hsize), 255, 255);
+ cvtColor(buf, buf, CV_HSV2BGR);
+
+ for( int i = 0; i < hsize; i++ )
+ {
+ int val = saturate_cast<int>(hist.at<float>(i)*histimg.rows/255);
+ rectangle( histimg, Point(i*binW,histimg.rows),
+ Point((i+1)*binW,histimg.rows - val),
+ Scalar(buf.at<Vec3b>(i)), -1, 8 );
+ }
}
- }
- calcBackProject(&hue, 1, 0, hist, backproj, &phranges);
- backproj &= mask;
- RotatedRect trackBox = CamShift(backproj, trackWindow,
- TermCriteria( CV_TERMCRIT_EPS | CV_TERMCRIT_ITER, 10, 1 ));
+ calcBackProject(&hue, 1, 0, hist, backproj, &phranges);
+ backproj &= mask;
+ RotatedRect trackBox = CamShift(backproj, trackWindow,
+ TermCriteria( CV_TERMCRIT_EPS | CV_TERMCRIT_ITER, 10, 1 ));
+ if( trackWindow.area() <= 1 )
+ {
+ int cols = backproj.cols, rows = backproj.rows, r = (MIN(cols, rows) + 5)/6;
+ trackWindow = Rect(trackWindow.x - r, trackWindow.y - r,
+ trackWindow.x + r, trackWindow.y + r) &
+ Rect(0, 0, cols, rows);
+ }
- if( backprojMode )
- cvtColor( backproj, image, CV_GRAY2BGR );
- ellipse( image, trackBox, Scalar(0,0,255), 3, CV_AA );
+ if( backprojMode )
+ cvtColor( backproj, image, CV_GRAY2BGR );
+ ellipse( image, trackBox, Scalar(0,0,255), 3, CV_AA );
+ }
}
+ else if( trackObject < 0 )
+ paused = false;
if( selectObject && selection.width > 0 && selection.height > 0 )
{
else
namedWindow( "Histogram", 1 );
break;
+ case 'p':
+ paused = !paused;
+ break;
default:
;
}