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  //
  //  !!! this sample requires the opencv_datasets module !!!
  //
  
  #include "opencv2/opencv_modules.hpp"
  #ifdef HAVE_OPENCV_DATASETS
  
  #include "opencv2/datasets/track_vot.hpp"
  #include <opencv2/core/utility.hpp>
  #include <opencv2/tracking.hpp>
  #include <opencv2/videoio.hpp>
  #include <opencv2/highgui.hpp>
  #include <opencv2/imgproc.hpp>
  #include "samples_utility.hpp"
  
  #include <iostream>
  
  using namespace std;
  using namespace cv;
  using namespace cv::datasets;
  
  #define NUM_TEST_FRAMES 300
  #define TEST_VIDEO_INDEX 1		//TLD Dataset Video Index from 1-10
  //#define RECORD_VIDEO_FLG
  
  static Mat image;
  static Rect2d boundingBox;
  static bool paused;
  static bool selectObject = false;
  static bool startSelection = false;
  
  static const char* keys =
  { "{@tracker_algorithm | | Tracker algorithm }"
  "{@dataset_path     |true| Dataset path     }"
  "{@dataset_id     |1| Dataset ID     }"
  };
  
  static void onMouse(int event, int x, int y, int, void*)
  {
  	if (!selectObject)
  	{
  		switch (event)
  		{
  		case EVENT_LBUTTONDOWN:
  			//set origin of the bounding box
  			startSelection = true;
  			boundingBox.x = x;
  			boundingBox.y = y;
  			boundingBox.width = boundingBox.height = 0;
  			break;
  		case EVENT_LBUTTONUP:
  			//sei with and height of the bounding box
  			boundingBox.width = std::abs(x - boundingBox.x);
  			boundingBox.height = std::abs(y - boundingBox.y);
  			paused = false;
  			selectObject = true;
  			break;
  		case EVENT_MOUSEMOVE:
  
  			if (startSelection && !selectObject)
  			{
  				//draw the bounding box
  				Mat currentFrame;
  				image.copyTo(currentFrame);
  				rectangle(currentFrame, Point((int)boundingBox.x, (int)boundingBox.y), Point(x, y), Scalar(255, 0, 0), 2, 1);
  				imshow("Tracking API", currentFrame);
  			}
  			break;
  		}
  	}
  }
  
  static void help()
  {
  	cout << "\nThis example shows the functionality of \"Long-term optical tracking API\""
  		"TLD dataset ID: 1~10, VOT2015 dataset ID: 1~60\n"
  		"-- pause video [p] and draw a bounding box around the target to start the tracker\n"
  		"Example:\n"
  		"./example_tracking_tracker_dataset <tracker_algorithm> <dataset_path> <dataset_id>\n"
  		<< endl;
  
  	cout << "\n\nHot keys: \n"
  		"\tq - quit the program\n"
  		"\tp - pause video\n";
  }
  
  int main(int argc, char *argv[])
  {
  	CommandLineParser parser(argc, argv, keys);
  	string tracker_algorithm = parser.get<string>(0);
  	string datasetRootPath = parser.get<string>(1);
  	int datasetID = parser.get<int>(2);
  	if (tracker_algorithm.empty() || datasetRootPath.empty())
  	{
  		help();
  		return -1;
  	}
  
  	Mat frame;
  	paused = false;
  	namedWindow("Tracking API", 0);
  	setMouseCallback("Tracking API", onMouse, 0);
  
  	//Create Tracker
      Ptr<Tracker> tracker = createTrackerByName(tracker_algorithm);
  	if (!tracker)
  	{
  		cout << "***Error in the instantiation of the tracker...***\n";
  		getchar();
  		return 0;
  	}
  
  	//Init Dataset
  	Ptr<TRACK_vot> dataset = TRACK_vot::create();
  	dataset->load(datasetRootPath);
  	dataset->initDataset(datasetID);
  
  	//Read first frame
  	dataset->getNextFrame(frame);
  	frame.copyTo(image);
  
  	rectangle(image, boundingBox, Scalar(255, 0, 0), 2, 1);
  	imshow("Tracking API", image);
  
  
  	bool initialized = false;
  	paused = true;
  	int frameCounter = 0;
  
  	//Time measurment
  	int64 e3 = getTickCount();
  	for (;;)
  	{
  		if (!paused)
  		{
  			//Time measurment
  			int64 e1 = getTickCount();
  			if (initialized){
  				if (!dataset->getNextFrame(frame))
  					break;
  				frame.copyTo(image);
  			}
  
  			if (!initialized && selectObject)
  			{
  				//initializes the tracker
  				if (!tracker->init(frame, boundingBox))
  				{
  					cout << "***Could not initialize tracker...***\n";
  					return -1;
  				}
  				initialized = true;
  			}
  			else if (initialized)
  			{
  				//updates the tracker
  				if (tracker->update(frame, boundingBox))
  				{
  					rectangle(image, boundingBox, Scalar(255, 0, 0), 2, 1);
  				}
  			}
  			imshow("Tracking API", image);
  			frameCounter++;
  			//Time measurment
  			int64 e2 = getTickCount();
  			double t1 = (e2 - e1) / getTickFrequency();
  			cout << frameCounter << "\tframe :  " << t1 * 1000.0 << "ms" << endl;
  		}
  
  		char c = (char)waitKey(2);
  		if (c == 'q')
  			break;
  		if (c == 'p')
  			paused = !paused;
  
  
  
  		//waitKey(0);
  	}
  
  	//Time measurment
  	int64 e4 = getTickCount();
  	double t2 = (e4 - e3) / getTickFrequency();
  	cout << "Average Time for Frame:  " << t2 * 1000.0 / frameCounter << "ms" << endl;
  	cout << "Average FPS:  " << 1.0 / t2*frameCounter << endl;
  
  
  	waitKey(0);
  
  	return 0;
  }
  
  
  
  #else // ! HAVE_OPENCV_DATASETS
  #include <opencv2/core.hpp>
  int trackerDataset() {
  	CV_Error(cv::Error::StsNotImplemented , "this sample needs to be built with opencv_datasets !");
  	return -1;
  }
  #endif // HAVE_OPENCV_DATASETS
  