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#include <opencv2/core/utility.hpp>
#include <opencv2/tracking.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
#include <cstring>
using namespace std;
using namespace cv;
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 }"
"{@video_name | | video name }"
"{@start_frame |0| Start frame }"
"{@bounding_frame |0,0,0,0| Initial bounding frame}"};
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;
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\""
"-- pause video [p] and draw a bounding box around the target to start the tracker\n"
"Example of <video_name> is in opencv_extra/testdata/cv/tracking/\n"
"Call:\n"
"./tracker <tracker_algorithm> <video_name> <start_frame> [<bounding_frame>]\n"
"tracker_algorithm can be: MIL, BOOSTING, MEDIANFLOW, TLD\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 video_name = parser.get<String>( 1 );
int start_frame = parser.get<int>( 2 );
if( tracker_algorithm.empty() || video_name.empty() )
{
help();
return -1;
}
int coords[4]={0,0,0,0};
bool initBoxWasGivenInCommandLine=false;
{
String initBoundingBox=parser.get<String>(3);
for(size_t npos=0,pos=0,ctr=0;ctr<4;ctr++){
npos=initBoundingBox.find_first_of(',',pos);
if(npos==string::npos && ctr<3){
printf("bounding box should be given in format \"x1,y1,x2,y2\",where x's and y's are integer cordinates of opposed corners of bdd box\n");
printf("got: %s\n",initBoundingBox.substr(pos,string::npos).c_str());
printf("manual selection of bounding box will be employed\n");
break;
}
int num=atoi(initBoundingBox.substr(pos,(ctr==3)?(string::npos):(npos-pos)).c_str());
if(num<=0){
printf("bounding box should be given in format \"x1,y1,x2,y2\",where x's and y's are integer cordinates of opposed corners of bdd box\n");
printf("got: %s\n",initBoundingBox.substr(pos,npos-pos).c_str());
printf("manual selection of bounding box will be employed\n");
break;
}
coords[ctr]=num;
pos=npos+1;
}
if(coords[0]>0 && coords[1]>0 && coords[2]>0 && coords[3]>0){
initBoxWasGivenInCommandLine=true;
}
}
//open the capture
VideoCapture cap;
cap.open( video_name );
cap.set( CAP_PROP_POS_FRAMES, start_frame );
if( !cap.isOpened() )
{
help();
cout << "***Could not initialize capturing...***\n";
cout << "Current parameter's value: \n";
parser.printMessage();
return -1;
}
Mat frame;
paused = true;
namedWindow( "Tracking API", 1 );
setMouseCallback( "Tracking API", onMouse, 0 );
//instantiates the specific Tracker
Ptr<Tracker> tracker = Tracker::create( tracker_algorithm );
if( tracker == NULL )
{
cout << "***Error in the instantiation of the tracker...***\n";
return -1;
}
//get the first frame
cap >> frame;
frame.copyTo( image );
if(initBoxWasGivenInCommandLine){
selectObject=true;
paused=false;
boundingBox.x = coords[0];
boundingBox.y = coords[1];
boundingBox.width = std::abs( coords[2] - coords[0] );
boundingBox.height = std::abs( coords[3]-coords[1]);
printf("bounding box with vertices (%d,%d) and (%d,%d) was given in command line\n",coords[0],coords[1],coords[2],coords[3]);
rectangle( image, boundingBox, Scalar( 255, 0, 0 ), 2, 1 );
}
imshow( "Tracking API", image );
bool initialized = false;
int frameCounter = 0;
for ( ;; )
{
if( !paused )
{
if(initialized){
cap >> frame;
if(frame.empty()){
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++;
}
char c = (char) waitKey( 2 );
if( c == 'q' )
break;
if( c == 'p' )
paused = !paused;
}
return 0;
}
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