opencv 3.2 中的KCF 跟踪算法 如何判断目标跟丢？？？？

[大大的道道的]

如下代码中的isFound 一直为true， 并不能判断是否跟丢

/*----------------------------------------------
 * Usage:
 * example_tracking_kcf <video_name>
 *
 * example:
 * example_tracking_kcf Bolt/img/%04.jpg
 * example_tracking_kcf faceocc2.webm
 *--------------------------------------------------*/

#include <opencv2/core/utility.hpp>
#include <opencv2/tracking.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
#include <cstring>
#include "samples_utility.hpp"

using namespace std;
using namespace cv;

int main( int argc, char** argv ){
  // show help
  if(argc<2){
    cout<<
      " Usage: example_tracking_kcf <video_name>\n"
      " examples:\n"
      " example_tracking_kcf Bolt/img/%04.jpg\n"
      " example_tracking_kcf faceocc2.webm\n"
      << endl;
    return 0;
  }

  // create the tracker
  Ptr<Tracker> tracker = TrackerKCF::create();

  // set input video
  std::string video = argv[1];
  VideoCapture cap(video);

  Mat frame;

  // get bounding box
  cap >> frame;
  Rect2d roi= selectROI("tracker", frame, true, false);

  //quit if ROI was not selected
  if(roi.width==0 || roi.height==0)
    return 0;

  // initialize the tracker
  tracker->init(frame,roi);

  // 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
    bool isfound = tracker->update(frame,roi);
    if(!isfound)
    {
        cout << "The target has been lost...\n";
        waitKey(0);
        return 0;
    }

    // draw the tracked object
    rectangle( frame, roi, Scalar( 255, 0, 0 ), 2, 1 );

    // show image with the tracked object
    imshow("tracker",frame);

    //quit on ESC button
    if(waitKey(1)==27)break;
  }

}

[赵4老师]

提醒：OpenCV是开源的。

[大大的道道的]

opencv 3.3 中有个 params:: thresh 可以设置阈值0-1 之间， 用这个判断是否跟丢

[js8878]

楼上的请问params:: thresh在哪里呀

[大大的道道的]

@wwzh2003

[js8878]

引用 4 楼 u011258240 的回复:

@wwzh2003

这个函数无法在主程序里引用！

[赵4老师]

VS IDE中，在不明白的符号上点鼠标右键，选转到定义或查找所有引用。

[大大的道道的]

@qq_22823553 好早就解决了

Params 是public 的变量啊 为啥不能更改？？