Add preprocessor directive to use flann

modules/tracking/samples/multitracker.cpp

@@ -3,19 +3,28 @@
  * example_tracking_multitracker <video_name> [algorithm]
  *
  * example:
- * example_tracking_multitracker Bolt/img/%04.jpg
+ * example_tracking_multitracker Bolt/img/%04d.jpg
  * example_tracking_multitracker faceocc2.webm KCF
+ *
+ * Note: after the OpenCV libary is installed,
+ * please re-compile this code with "HAVE_OPENCV" parameter activated
+ * to enable the high precission of fps computation
  *--------------------------------------------------*/
 
+#define HAVE_OPENCV
+
 #include <opencv2/core/utility.hpp>
 #include <opencv2/tracking.hpp>
 #include <opencv2/videoio.hpp>
 #include <opencv2/highgui.hpp>
-#include "opencv2/flann/timer.h" // it should be opencv2/flann.hpp
 #include <iostream>
 #include <cstring>
 #include <ctime>
 
+#ifdef HAVE_OPENCV
+#include <opencv2/flann.hpp>
+#endif
+
 #define RESET   "\033[0m"
 #define RED     "\033[31m"      /* Red */
 #define GREEN   "\033[32m"      /* Green */
@@ -60,14 +69,22 @@ int main( int argc, char** argv ){
     cout<<
       " Usage: example_tracking_multitracker <video_name> [algorithm]\n"
       " examples:\n"
-      " example_tracking_multitracker Bolt/img/%04.jpg\n"
+      " example_tracking_multitracker Bolt/img/%04d.jpg\n"
       " example_tracking_multitracker faceocc2.webm MEDIANFLOW\n"
+      " \n"
+      " Note: after the OpenCV libary is installed,\n"
+      " please re-compile with the HAVE_OPENCV parameter activated\n"
+      " to enable the high precission of fps computation.\n"
       << endl;
     return 0;
   }
 
   // timer
+#ifdef HAVE_OPENCV
   cvflann::StartStopTimer timer;
+#else
+  clock_t timer;
+#endif
 
   // for showing the speed
   double fps;
@@ -118,15 +135,26 @@ int main( int argc, char** argv ){
       break;
 
     // start the timer
+#ifdef HAVE_OPENCV
     timer.start();
+#else
+    timer=clock();
+#endif
 
     //update the tracking result
     trackers.update(frame);
 
     // calculate the processing speed
+#ifdef HAVE_OPENCV
     timer.stop();
     fps=1.0/timer.value;
     timer.reset();
+#else
+    timer=clock();
+    trackers.update(frame);
+    timer=clock()-timer;
+    fps=(double)CLOCKS_PER_SEC/(double)timer;
+#endif
 
     // draw the tracked object
     for(unsigned i=0;i<trackers.objects.size();i++)