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In this web site, it provides a lot of benchmark for multiple object tracking.

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This time we are going to create a new Object intead of using subclass of QThread,and all its job is transfer to a QThread instance by calling moveToThread method.You can find out details on youtube.
Let’s create a new project of window application and add new class, in which it accumaltes from 1 to 999. 

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A good example for writing QThread with a GUI.
Here is another similar example:QT5 TUTORIAL QTHREADS - GUI THREAD - 2020

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A good example that help you learn how to handle mouse events

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cv::Mat img(cv::Size(800, 800), CV_8UC3);

 // big region of interest (ROI)

 Rect roi(100, 100, 400, 400);

 rectangle(img, roi, Scalar(255, 0, 0), 1);

 // some rectangles

 vector<Rect> lpROIs;

 lpROIs.push_back(Rect(30, 50, 100, 100));

 lpROIs.push_back(Rect(420, 250, 100, 100));

 lpROIs.push_back(Rect(150, 140, 100, 100));

 lpROIs.push_back(Rect(300, 100, 100, 100));

 lpROIs.push_back(Rect(250, 250, 100, 100));

 lpROIs.push_back(Rect(300, 450, 100, 100));

 // check out if the rectangle inside the ROI

 for(int i=0; i<lpROIs.size(); i++)

 {

 // inside the ROI

 if( (roi&lpROIs[i])==lpROIs[i] )

 rectangle(img, lpROIs[i], Scalar(0,0,255), -1);

 else

 rectangle(img, lpROIs[i], Scalar(0,255,0), 1);

 }

 imshow("img", img);

 waitKey();

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First, set up OpenCV building environments

INCLUDEPATH += C:\OpenCV\OpenCV4.2.0DNN\include

LIBS += -LC:\OpenCV\OpenCV4.2.0DNN\lib \

-lopencv_world420

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First, set up OpenCV building environments

INCLUDEPATH += C:\OpenCV\OpenCV4.2.0DNN\include

LIBS += -LC:\OpenCV\OpenCV4.2.0DNN\lib \

-lopencv_world420

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QTabBar *tabBar = ui->tabWidget->findChild<QTabBar *>();

tabBar->hide();

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mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QtConcurrent/QtConcurrentRun>

QT_BEGIN_NAMESPACE

namespace Ui { class MainWindow; }

QT_END_NAMESPACE

class MainWindow : public QMainWindow

{

 Q_OBJECT

public:

 MainWindow(QWidget *parent = nullptr);

 ~MainWindow();

private slots:

 void on_pushButton_start_clicked();

 void on_pushButton_stop_clicked();

private:

 Ui::MainWindow *ui;

 int counter;

 bool running;

private:

 void addCounter();

};

#endif // MAINWINDOW_H

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Change tabPosition
Change tabShape

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