added tutorials for KCF tracker

modules/tracking/samples/tutorial_multitracker.cpp

@@ -0,0 +1,99 @@
+/*----------------------------------------------
+ * Usage:
+ * example_tracking_multitracker <video_name> [algorithm]
+ *
+ * example:
+ * example_tracking_multitracker Bolt/img/%04d.jpg
+ * example_tracking_multitracker faceocc2.webm KCF
+ *--------------------------------------------------*/
+
+#include <opencv2/core/utility.hpp>
+#include <opencv2/tracking.hpp>
+#include <opencv2/videoio.hpp>
+#include <opencv2/highgui.hpp>
+#include <iostream>
+#include <cstring>
+#include <ctime>
+
+using namespace std;
+using namespace cv;
+
+int main( int argc, char** argv ){
+  // show help
+  if(argc<2){
+    cout<<
+      " Usage: example_tracking_multitracker <video_name> [algorithm]\n"
+      " examples:\n"
+      " example_tracking_multitracker Bolt/img/%04d.jpg\n"
+      " example_tracking_multitracker faceocc2.webm MEDIANFLOW\n"
+      << endl;
+    return 0;
+  }
+
+  // set the default tracking algorithm
+  std::string trackingAlg = "KCF";
+
+  // set the tracking algorithm from parameter
+  if(argc>2)
+    trackingAlg = argv[2];
+
+  // create the tracker
+  //! [create]
+  MultiTracker trackers(trackingAlg);
+  //! [create]
+
+  // container of the tracked objects
+  //! [roi]
+  vector<Rect2d> objects;
+  //! [roi]
+
+  // set input video
+  std::string video = argv[1];
+  VideoCapture cap(video);
+
+  Mat frame;
+
+  // get bounding box
+  cap >> frame;
+  //! [selectmulti]
+  selectROI("tracker",frame,objects);
+  //! [selectmulti]
+
+  //quit when the tracked object(s) is not provided
+  if(objects.size()<1)
+    return 0;
+
+  // initialize the tracker
+  //! [init]
+  trackers.add(frame,objects);
+  //! [init]
+
+  // do the tracking
+  printf("Start the tracking process, press ESC to quit.\n");
+  for ( ;; ){
+    // get frame from the video
+    cap >> frame;
+
+    // stop the program if no more images
+    if(frame.rows==0 || frame.cols==0)
+      break;
+
+    //update the tracking result
+    //! [update]
+    trackers.update(frame);
+    //! [update]
+
+    //! [result]
+    // draw the tracked object
+    for(unsigned i=0;i<trackers.objects.size();i++)
+      rectangle( frame, trackers.objects[i], Scalar( 255, 0, 0 ), 2, 1 );
+    //! [result]
+
+    // show image with the tracked object
+    imshow("tracker",frame);
+
+    //quit on ESC button
+    if(waitKey(1)==27)break;
+  }
+
+}