opencv3/C++ 使用Tracker实现简单目标跟踪

 static Ptr<TrackerMIL> create(const TrackerMIL::Params ¶meters);
 CV_WRAP static Ptr<TrackerMIL> create();

struct CV_EXPORTS Params
 {
 PARAMS（）;
  //采样器的参数
  float samplerInitInRadius; //初始收集正面实例的半径
  int samplerInitMaxNegNum; //初始使用负样本
  float samplerSearchWinSize; //搜索窗口的大小
  float samplerTrackInRadius; //在跟踪期间收集正面实例的半径
  int samplerTrackMaxPosNum; //在追踪期间使用正面样本
  int samplerTrackMaxNegNum; //在跟踪期间使用的负样本
  int featureSetNumFeatures; //特征

  void read（const FileNode＆fn）;
  void write（FileStorage＆fs）const;
 };

 static Ptr<TrackerBoosting> create(const TrackerBoosting::Params ¶meters);
 CV_WRAP static Ptr<TrackerBoosting> create();

 struct CV_EXPORTS Params
{
 PARAMS（）;
  int numClassifiers; //在OnlineBoosting算法中使用的分类器的数量
  float samplerOverlap; //搜索区域参数
  float samplerSearchFactor; //搜索区域参数
  int iterationInit; //初始迭代
  int featureSetNumFeatures; //特征
 //从文件读取参数
  void read（const FileNode＆fn）;
 //从文件写入参数
  void write（FileStorage＆fs）const;
 };

#include <opencv2/opencv.hpp>
#include <opencv2/video.hpp>
#include <opencv2/tracking.hpp>
#include <opencv2/tracking/tracker.hpp>

using namespace cv;

void draw_rectangle(int event, int x, int y, int flags, void*);
Mat firstFrame;
Point previousPoint, currentPoint;
Rect2d bbox;
int main(int argc, char *argv[])
{
 VideoCapture capture;
 Mat frame;
 frame = capture.open("/home/w/mycode/QT/img/runners.avi");
 if(!capture.isOpened())
 {
  printf("can not open ...\n");
  return -1;
 }
 //获取视频的第一帧,并框选目标
 capture.read(firstFrame);
 if(!firstFrame.empty())
 {
  namedWindow("output", WINDOW_AUTOSIZE);
  imshow("output", firstFrame);
  setMouseCallback("output", draw_rectangle, 0);
  waitKey();
 }
 //使用TrackerMIL跟踪
 Ptr<TrackerMIL> tracker= TrackerMIL::create();
 //Ptr<TrackerTLD> tracker= TrackerTLD::create();
 //Ptr<TrackerKCF> tracker = TrackerKCF::create();
 //Ptr<TrackerMedianFlow> tracker = TrackerMedianFlow::create();
 //Ptr<TrackerBoosting> tracker= TrackerBoosting::create();
 capture.read(frame);
 tracker->init(frame,bbox);
 namedWindow("output", WINDOW_AUTOSIZE);
 while (capture.read(frame))
 {
  tracker->update(frame,bbox);
  rectangle(frame,bbox, Scalar(255, 0, 0), 2, 1);
  imshow("output", frame);
  if(waitKey(20)=='q')
  return 0;
 }
 capture.release();
 destroyWindow("output");
 return 0;
}

//框选目标
void draw_rectangle(int event, int x, int y, int flags, void*)
{
 if (event == EVENT_LBUTTONDOWN)
 {
  previousPoint = Point(x, y);
 }
 else if (event == EVENT_MOUSEMOVE && (flags&EVENT_FLAG_LBUTTON))
 {
  Mat tmp;
  firstFrame.copyTo(tmp);
  currentPoint = Point(x, y);
  rectangle(tmp, previousPoint, currentPoint, Scalar(0, 255, 0, 0), 1, 8, 0);
  imshow("output", tmp);
 }
 else if (event == EVENT_LBUTTONUP)
 {
  bbox.x = previousPoint.x;
  bbox.y = previousPoint.y;
  bbox.width = abs(previousPoint.x-currentPoint.x);
  bbox.height = abs(previousPoint.y-currentPoint.y);
 }
 else if (event == EVENT_RBUTTONUP)
 {
  destroyWindow("output");
 }
}