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Declaration of function and use it

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  • jsulmJ jsulm

    @gauravsharma0190 What is ontrackball? Where is it declared? Do you have to include a header file where it is declared?

    G Offline
    G Offline
    gauravsharma0190
    wrote on last edited by
    #27

    @jsulm Yes it is function which is declare in the Opencv C code.
    Here is the function.
    @brief Trackbar callback - Canny thresholds input with a ratio 1:3
    /
    void onTrackball(int, void)
    {
    /// Reduce noise with a kernel 3x3
    blur( src_gray, detected_edges, Size(3,3) );
    /// Canny detector
    Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );

    /// Using Canny's output as a mask, we display our result
    dst = Scalar::all(0);

    src.copyTo( dst, detected_edges);
    imshow( window_name, dst );
    }

    less than a minute ago

    jsulmJ 1 Reply Last reply
    0
    • G gauravsharma0190

      @jsulm Yes it is function which is declare in the Opencv C code.
      Here is the function.
      @brief Trackbar callback - Canny thresholds input with a ratio 1:3
      /
      void onTrackball(int, void)
      {
      /// Reduce noise with a kernel 3x3
      blur( src_gray, detected_edges, Size(3,3) );
      /// Canny detector
      Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );

      /// Using Canny's output as a mask, we display our result
      dst = Scalar::all(0);

      src.copyTo( dst, detected_edges);
      imshow( window_name, dst );
      }

      less than a minute ago

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #28

      @gauravsharma0190 Where is this function declared? In which header file? "function not declared" means the function is not known. You have to make it visible including the header file. It is the same story as in C.

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      G 2 Replies Last reply
      0
      • jsulmJ jsulm

        @gauravsharma0190 Where is this function declared? In which header file? "function not declared" means the function is not known. You have to make it visible including the header file. It is the same story as in C.

        G Offline
        G Offline
        gauravsharma0190
        wrote on last edited by
        #29

        @jsulm i Declare it in mainwindow.h
        file as void onTrackball.
        and i will send you all my code which i did .

        1 Reply Last reply
        0
        • jsulmJ jsulm

          @gauravsharma0190 Where is this function declared? In which header file? "function not declared" means the function is not known. You have to make it visible including the header file. It is the same story as in C.

          G Offline
          G Offline
          gauravsharma0190
          wrote on last edited by
          #30

          @jsulm
          Here i am sending you my all code.
          **

          • /////main.cpp///**
            #include "mainwindow.h"
            #include <QApplication>
            #include<QSplashScreen>
            #include<QTimer>
            #include<opencv2/highgui/highgui.hpp>
            #include<opencv2/core/core.hpp>
            #include<opencv2/opencv.hpp>
            using namespace cv;
            using namespace std;
            int main(int argc, char *argv[])
            {

            QApplication a(argc, argv);
            QSplashScreen *splash =new QSplashScreen;
            splash->setPixmap(QPixmap("/home/pi/Desktop/ceeri1.jpg"));
            splash->show();

            MainWindow w;
            QTimer::singleShot(3500,splash,SLOT(close()));

            QTimer::singleShot(3500,&w,SLOT(show()));

            //w.show();

            return a.exec();
            }
            ////mainwindow.h
            #ifndef MAINWINDOW_H
            #define MAINWINDOW_H

          #include <QMainWindow>
          //using namespace cv;
          namespace Ui {
          class MainWindow;
          }

          class MainWindow : public QMainWindow
          {
          Q_OBJECT

          public:
          explicit MainWindow(QWidget *parent = 0);
          ~MainWindow();

          private slots:
          void showTime();

          void on_pushButton_5_clicked();
          

          void onTrackball_clicked(int,void*);

          private:
          Ui::MainWindow *ui;
          };

          #endif // MAINWINDOW_H
          ///mainwindow.c

          #include "mainwindow.h"
          #include "ui_mainwindow.h"
          #include<opencv2/opencv.hpp>
          #include <opencv2/highgui/highgui.hpp>
          #include <opencv2/core/core.hpp>
          #include<QFileDialog>
          #include<QMessageBox>
          #include <iostream>
          #include <string>
          #include <fstream>
          #include<time.h>
          #include<QTimer>
          #include<QDateTime>
          using namespace cv;
          using namespace std;
          MainWindow::MainWindow(QWidget *parent) :
          QMainWindow(parent),
          ui(new Ui::MainWindow)
          {
          ui->setupUi(this);
          QTimer *timer=new QTimer(this);
          connect(timer,SIGNAL(timeout()),this,SLOT(showTime()));
          timer->start();
          QDateTime dateTime=QDateTime::currentDateTime();
          QString datetimetext=dateTime.toString();
          ui->DateTime->setText(datetimetext);

          }
          ////////Time///////////////
          void MainWindow:: showTime()
          {
          QTime time=QTime::currentTime();
          QString time_text=time.toString("hh : mm : ss");
          if((time.second() % 2)==0)
          {
          time_text[3] =' ';
          time_text[8] =' ';
          }
          ui->Digital->setText(time_text);

          }

          MainWindow::~MainWindow()
          {
          delete ui;
          }

          void MainWindow::on_pushButton_4_clicked()
          {

          }

          void MainWindow::on_pushButton_5_clicked()
          {
          QString filename=QFileDialog::getOpenFileName(
          this,
          tr("Open file") ,
          "/home/pi/Desktop",
          tr("All files(*.png *.jpg)"));

          QMessageBox::information(this,tr("Filename"),filename);
          if(QString::compare(filename,QString())!=0)
          {
              QImage image;
              bool valid=image.load(filename);
              if(valid)
              {
                  image=image.scaledToWidth(ui->Picture->width(),Qt::SmoothTransformation);
                  ui->Picture->setPixmap(QPixmap::fromImage(image));
          
              }
          

          void MainWindow::onTrackball_clicked(int,void*)
          {
          //Here wite the all function//
          ///Now how to put this code in this.

          ////////This is the code i have to input in this push button////
          Mat src, src_gray;
          Mat dst, detected_edges;

          int edgeThresh = 1;
          int lowThreshold;
          int const max_lowThreshold = 100;
          int ratio = 3;
          int kernel_size = 3;
          char* window_name = "Edge Map";

          /**

          @function CannyThreshold
          @brief Trackbar callback - Canny thresholds input with a ratio 1:3
          /
          void CannyThreshold(int, void)
          {
          /// Reduce noise with a kernel 3x3
          blur( src_gray, detected_edges, Size(3,3) );
          /// Canny detector
          Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );

          /// Using Canny's output as a mask, we display our result
          dst = Scalar::all(0);

          src.copyTo( dst, detected_edges);
          imshow( window_name, dst );
          }

          /** @function main /
          int main( int argc, char* argv )
          {
          /// Load an image
          src = imread( argv[1] );

          if( !src.data )
          { return -1; }

          /// Create a matrix of the same type and size as src (for dst)
          dst.create( src.size(), src.type() );

          /// Convert the image to grayscale
          cvtColor( src, src_gray, CV_BGR2GRAY );

          /// Create a window
          namedWindow( window_name, CV_WINDOW_AUTOSIZE );

          /// Create a Trackbar for user to enter threshold
          createTrackbar( "Min Threshold:", window_name, &lowThreshold, max_lowThreshold, CannyThreshold );

          /// Show the image
          CannyThreshold(0, 0);

          /// Wait until user exit program by pressing a key
          waitKey(0);

          return 0;
          }

          }
          }
          
          1 Reply Last reply
          0
          • jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #31

            Sorry, but the code you posted is invalid C/C++! First of all: why do you have 2 main functions?
            Why did you put other functions inside void MainWindow::onTrackball_clicked(int,void*)? This is not going to compile and I'm not going to fix it for you. How familiar are you actually with C/C++?
            What you have to do is: do not put the C function definitions inside void MainWindow::onTrackball_clicked(int,void*), instead put them inside another source code file and header, include the header file in MainWindow and then call the functions in void MainWindow::onTrackball_clicked(int,void*). As an alternative you can have those C functions in MainWindow.cpp but not inside void MainWindow::onTrackball_clicked(int,void*) !

            https://forum.qt.io/topic/113070/qt-code-of-conduct

            G 1 Reply Last reply
            1
            • jsulmJ jsulm

              Sorry, but the code you posted is invalid C/C++! First of all: why do you have 2 main functions?
              Why did you put other functions inside void MainWindow::onTrackball_clicked(int,void*)? This is not going to compile and I'm not going to fix it for you. How familiar are you actually with C/C++?
              What you have to do is: do not put the C function definitions inside void MainWindow::onTrackball_clicked(int,void*), instead put them inside another source code file and header, include the header file in MainWindow and then call the functions in void MainWindow::onTrackball_clicked(int,void*). As an alternative you can have those C functions in MainWindow.cpp but not inside void MainWindow::onTrackball_clicked(int,void*) !

              G Offline
              G Offline
              gauravsharma0190
              wrote on last edited by
              #32

              @jsulm
              i don't put these function definition inside voidmainwindow::ontrackball
              but i am asking you how can i call that function inside my void mainwindow::ontrackball

              void CannyThreshold(int, void)
              {
              /// Reduce noise with a kernel 3x3
              blur( src_gray, detected_edges, Size(3,3) );
              /// Canny detector
              Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );
              
              /// Using Canny's output as a mask, we display our result
              dst = Scalar::all(0);
              
              src.copyTo( dst, detected_edges);
              imshow( window_name, dst );
              }
              

              Mean i hyave done .cpp and .h file of this and include in my code both.

              jsulmJ 2 Replies Last reply
              0
              • G gauravsharma0190

                @jsulm
                i don't put these function definition inside voidmainwindow::ontrackball
                but i am asking you how can i call that function inside my void mainwindow::ontrackball

                void CannyThreshold(int, void)
                {
                /// Reduce noise with a kernel 3x3
                blur( src_gray, detected_edges, Size(3,3) );
                /// Canny detector
                Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );
                
                /// Using Canny's output as a mask, we display our result
                dst = Scalar::all(0);
                
                src.copyTo( dst, detected_edges);
                imshow( window_name, dst );
                }
                

                Mean i hyave done .cpp and .h file of this and include in my code both.

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #33

                @gauravsharma0190 Like this?

                CannyThreshold(1, nullptr);
                

                So, what exactly is the problem?
                In the code you posted you DID put these function definitions inside void MainWindow::onTrackball_clicked(int,void*) (just check what you posted).

                https://forum.qt.io/topic/113070/qt-code-of-conduct

                1 Reply Last reply
                0
                • G gauravsharma0190

                  @jsulm
                  i don't put these function definition inside voidmainwindow::ontrackball
                  but i am asking you how can i call that function inside my void mainwindow::ontrackball

                  void CannyThreshold(int, void)
                  {
                  /// Reduce noise with a kernel 3x3
                  blur( src_gray, detected_edges, Size(3,3) );
                  /// Canny detector
                  Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );
                  
                  /// Using Canny's output as a mask, we display our result
                  dst = Scalar::all(0);
                  
                  src.copyTo( dst, detected_edges);
                  imshow( window_name, dst );
                  }
                  

                  Mean i hyave done .cpp and .h file of this and include in my code both.

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #34

                  @gauravsharma0190 Shouldn't

                  void CannyThreshold(int, void)
                  

                  be

                  void CannyThreshold(int, void*)
                  

                  ?

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  G 1 Reply Last reply
                  0
                  • G Offline
                    G Offline
                    gauravsharma0190
                    wrote on last edited by
                    #35

                    ok now i will send you refresh code just wait.
                    Thank you.
                    i will send you refresh code and errors.

                    1 Reply Last reply
                    0
                    • jsulmJ jsulm

                      @gauravsharma0190 Shouldn't

                      void CannyThreshold(int, void)
                      

                      be

                      void CannyThreshold(int, void*)
                      

                      ?

                      G Offline
                      G Offline
                      gauravsharma0190
                      wrote on last edited by
                      #36

                      @jsulm
                      hey here is the code i have done with that.
                      /////main.cpp////

                      #include<opencv2/highgui/highgui.hpp>
                      #include<opencv2/core/core.hpp>
                      #include<opencv2/opencv.hpp>
                      using namespace cv;
                      using namespace std;
                      int main(int argc, char *argv[])
                      {
                      
                          QApplication a(argc, argv);
                          QSplashScreen *splash =new QSplashScreen;
                          splash->setPixmap(QPixmap("/home/pi/Desktop/ceeri1.jpg"));
                          splash->show();
                      
                          MainWindow w;
                          QTimer::singleShot(3500,splash,SLOT(close()));
                      
                          QTimer::singleShot(3500,&w,SLOT(show()));
                      
                        //w.show();
                      
                          return a.exec();
                      }
                      

                      ///mainwindow.h///

                      #ifndef MAINWINDOW_H
                      #define MAINWINDOW_H
                      
                      #include <QMainWindow>
                      //using namespace cv;
                      namespace Ui {
                      class MainWindow;
                      }
                      
                      class MainWindow : public QMainWindow
                      {
                      Q_OBJECT
                      
                      public:
                      explicit MainWindow(QWidget *parent = 0);
                      ~MainWindow();
                      
                      private slots:
                      void showTime();
                      
                      void on_pushButton_5_clicked();
                      void onTrackball_clicked(int,void*);
                      
                      private:
                      Ui::MainWindow *ui;
                      };
                      
                      #endif // MAINWINDOW_H
                      

                      ///ontrack.h///

                      #ifndef __ONTRACK_h
                      #define __ONTRACK_h
                      void cannyThresold(int,void*);
                      #endif
                      

                      ///ontrack.cpp

                      #include "ontrack.h"
                      #include<opencv2/opencv.hpp>
                      #include <opencv2/highgui/highgui.hpp>
                      #include <opencv2/core/core.hpp>
                      void CannyThreshold(int, void)
                      {
                      /// Reduce noise with a kernel 3x3
                      blur( src_gray, detected_edges, Size(3,3) );
                      /// Canny detector
                      Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );
                      
                      /// Using Canny's output as a mask, we display our result
                      dst = Scalar::all(0);
                      
                      src.copyTo( dst, detected_edges);
                      imshow( window_name, dst );
                      }
                      

                      //Here Comes Mainwindow.cpp///

                      #include "ui_mainwindow.h"
                      #include<opencv2/opencv.hpp>
                      #include <opencv2/highgui/highgui.hpp>
                      #include <opencv2/core/core.hpp>
                      #include "ontrack.h"
                      #include<QFileDialog>
                      #include<QMessageBox>
                      #include <iostream>
                      #include <string>
                      #include <fstream>
                      #include<time.h>
                      #include<QTimer>
                      #include<QDateTime>
                      using namespace cv;
                      using namespace std;
                      MainWindow::MainWindow(QWidget *parent) :
                      QMainWindow(parent),
                      ui(new Ui::MainWindow)
                      {
                      ui->setupUi(this);
                      QTimer *timer=new QTimer(this);
                      connect(timer,SIGNAL(timeout()),this,SLOT(showTime()));
                      timer->start();
                      QDateTime dateTime=QDateTime::currentDateTime();
                      QString datetimetext=dateTime.toString();
                      ui->DateTime->setText(datetimetext);
                      
                      }
                      ////////Time///////////////
                      void MainWindow:: showTime()
                      {
                      QTime time=QTime::currentTime();
                      QString time_text=time.toString("hh : mm : ss");
                      if((time.second() % 2)==0)
                      {
                      time_text[3] =' ';
                      time_text[8] =' ';
                      }
                      ui->Digital->setText(time_text);
                      
                      }
                      
                      MainWindow::~MainWindow()
                      {
                      delete ui;
                      }
                      
                      void MainWindow::on_pushButton_4_clicked()
                      {
                      
                      }
                      
                      void MainWindow::on_pushButton_5_clicked()
                      {
                      QString filename=QFileDialog::getOpenFileName(
                      this,
                      tr("Open file") ,
                      "/home/pi/Desktop",
                      tr("All files(*.png *.jpg)"));
                      
                      QMessageBox::information(this,tr("Filename"),filename);
                      if(QString::compare(filename,QString())!=0)
                      {
                          QImage image;
                          bool valid=image.load(filename);
                          if(valid)
                          {
                              image=image.scaledToWidth(ui->Picture->width(),Qt::SmoothTransformation);
                              ui->Picture->setPixmap(QPixmap::fromImage(image));
                      
                          }
                      void MainWindow::onTrackball_clicked(int,void*)
                      {
                      
                      
                      Mat src, src_gray;
                      Mat dst, detected_edges;
                      
                      int edgeThresh = 1;
                      int lowThreshold;
                      int const max_lowThreshold = 100;
                      int ratio = 3;
                      int kernel_size = 3;
                      char* window_name = "Edge Map";
                      
                      
                      
                      @function CannyThreshold
                      @brief Trackbar callback - Canny thresholds input with a ratio 1:3
                      /
                      
                      
                      /// Load an image
                      src = imread( argv[1] );
                      
                      if( !src.data )
                      { return -1; }
                      
                      /// Create a matrix of the same type and size as src (for dst)
                      dst.create( src.size(), src.type() );
                      
                      /// Convert the image to grayscale
                      cvtColor( src, src_gray, CV_BGR2GRAY );
                      
                      /// Create a window
                      namedWindow( window_name, CV_WINDOW_AUTOSIZE );
                      
                      /// Create a Trackbar for user to enter threshold
                      createTrackbar( "Min Threshold:", window_name, &lowThreshold, max_lowThreshold, CannyThreshold );
                      
                      /// Show the image
                      CannyThreshold(0, 0);
                      
                      }
                      }
                      ...
                      But error occurs defination of function outside the class.
                      G 1 Reply Last reply
                      0
                      • G gauravsharma0190

                        @jsulm
                        hey here is the code i have done with that.
                        /////main.cpp////

                        #include<opencv2/highgui/highgui.hpp>
                        #include<opencv2/core/core.hpp>
                        #include<opencv2/opencv.hpp>
                        using namespace cv;
                        using namespace std;
                        int main(int argc, char *argv[])
                        {
                        
                            QApplication a(argc, argv);
                            QSplashScreen *splash =new QSplashScreen;
                            splash->setPixmap(QPixmap("/home/pi/Desktop/ceeri1.jpg"));
                            splash->show();
                        
                            MainWindow w;
                            QTimer::singleShot(3500,splash,SLOT(close()));
                        
                            QTimer::singleShot(3500,&w,SLOT(show()));
                        
                          //w.show();
                        
                            return a.exec();
                        }
                        

                        ///mainwindow.h///

                        #ifndef MAINWINDOW_H
                        #define MAINWINDOW_H
                        
                        #include <QMainWindow>
                        //using namespace cv;
                        namespace Ui {
                        class MainWindow;
                        }
                        
                        class MainWindow : public QMainWindow
                        {
                        Q_OBJECT
                        
                        public:
                        explicit MainWindow(QWidget *parent = 0);
                        ~MainWindow();
                        
                        private slots:
                        void showTime();
                        
                        void on_pushButton_5_clicked();
                        void onTrackball_clicked(int,void*);
                        
                        private:
                        Ui::MainWindow *ui;
                        };
                        
                        #endif // MAINWINDOW_H
                        

                        ///ontrack.h///

                        #ifndef __ONTRACK_h
                        #define __ONTRACK_h
                        void cannyThresold(int,void*);
                        #endif
                        

                        ///ontrack.cpp

                        #include "ontrack.h"
                        #include<opencv2/opencv.hpp>
                        #include <opencv2/highgui/highgui.hpp>
                        #include <opencv2/core/core.hpp>
                        void CannyThreshold(int, void)
                        {
                        /// Reduce noise with a kernel 3x3
                        blur( src_gray, detected_edges, Size(3,3) );
                        /// Canny detector
                        Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );
                        
                        /// Using Canny's output as a mask, we display our result
                        dst = Scalar::all(0);
                        
                        src.copyTo( dst, detected_edges);
                        imshow( window_name, dst );
                        }
                        

                        //Here Comes Mainwindow.cpp///

                        #include "ui_mainwindow.h"
                        #include<opencv2/opencv.hpp>
                        #include <opencv2/highgui/highgui.hpp>
                        #include <opencv2/core/core.hpp>
                        #include "ontrack.h"
                        #include<QFileDialog>
                        #include<QMessageBox>
                        #include <iostream>
                        #include <string>
                        #include <fstream>
                        #include<time.h>
                        #include<QTimer>
                        #include<QDateTime>
                        using namespace cv;
                        using namespace std;
                        MainWindow::MainWindow(QWidget *parent) :
                        QMainWindow(parent),
                        ui(new Ui::MainWindow)
                        {
                        ui->setupUi(this);
                        QTimer *timer=new QTimer(this);
                        connect(timer,SIGNAL(timeout()),this,SLOT(showTime()));
                        timer->start();
                        QDateTime dateTime=QDateTime::currentDateTime();
                        QString datetimetext=dateTime.toString();
                        ui->DateTime->setText(datetimetext);
                        
                        }
                        ////////Time///////////////
                        void MainWindow:: showTime()
                        {
                        QTime time=QTime::currentTime();
                        QString time_text=time.toString("hh : mm : ss");
                        if((time.second() % 2)==0)
                        {
                        time_text[3] =' ';
                        time_text[8] =' ';
                        }
                        ui->Digital->setText(time_text);
                        
                        }
                        
                        MainWindow::~MainWindow()
                        {
                        delete ui;
                        }
                        
                        void MainWindow::on_pushButton_4_clicked()
                        {
                        
                        }
                        
                        void MainWindow::on_pushButton_5_clicked()
                        {
                        QString filename=QFileDialog::getOpenFileName(
                        this,
                        tr("Open file") ,
                        "/home/pi/Desktop",
                        tr("All files(*.png *.jpg)"));
                        
                        QMessageBox::information(this,tr("Filename"),filename);
                        if(QString::compare(filename,QString())!=0)
                        {
                            QImage image;
                            bool valid=image.load(filename);
                            if(valid)
                            {
                                image=image.scaledToWidth(ui->Picture->width(),Qt::SmoothTransformation);
                                ui->Picture->setPixmap(QPixmap::fromImage(image));
                        
                            }
                        void MainWindow::onTrackball_clicked(int,void*)
                        {
                        
                        
                        Mat src, src_gray;
                        Mat dst, detected_edges;
                        
                        int edgeThresh = 1;
                        int lowThreshold;
                        int const max_lowThreshold = 100;
                        int ratio = 3;
                        int kernel_size = 3;
                        char* window_name = "Edge Map";
                        
                        
                        
                        @function CannyThreshold
                        @brief Trackbar callback - Canny thresholds input with a ratio 1:3
                        /
                        
                        
                        /// Load an image
                        src = imread( argv[1] );
                        
                        if( !src.data )
                        { return -1; }
                        
                        /// Create a matrix of the same type and size as src (for dst)
                        dst.create( src.size(), src.type() );
                        
                        /// Convert the image to grayscale
                        cvtColor( src, src_gray, CV_BGR2GRAY );
                        
                        /// Create a window
                        namedWindow( window_name, CV_WINDOW_AUTOSIZE );
                        
                        /// Create a Trackbar for user to enter threshold
                        createTrackbar( "Min Threshold:", window_name, &lowThreshold, max_lowThreshold, CannyThreshold );
                        
                        /// Show the image
                        CannyThreshold(0, 0);
                        
                        }
                        }
                        ...
                        But error occurs defination of function outside the class.
                        G Offline
                        G Offline
                        gauravsharma0190
                        wrote on last edited by
                        #37

                        @gauravsharma0190 said:

                        Sorry in ontrack.cpp i again add
                        Mat src, src_gray;
                        Mat dst, detected_edges;

                        jsulmJ 2 Replies Last reply
                        0
                        • G gauravsharma0190

                          @gauravsharma0190 said:

                          Sorry in ontrack.cpp i again add
                          Mat src, src_gray;
                          Mat dst, detected_edges;

                          jsulmJ Offline
                          jsulmJ Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on last edited by
                          #38

                          @gauravsharma0190 Can you post the whole error message?
                          Why do you have int and void* parameter in onTrackball_clicked which you do not use?

                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                          1 Reply Last reply
                          1
                          • G gauravsharma0190

                            @gauravsharma0190 said:

                            Sorry in ontrack.cpp i again add
                            Mat src, src_gray;
                            Mat dst, detected_edges;

                            jsulmJ Offline
                            jsulmJ Offline
                            jsulm
                            Lifetime Qt Champion
                            wrote on last edited by
                            #39

                            @gauravsharma0190 Take a look at this:

                            
                            void MainWindow::on_pushButton_5_clicked()
                            {
                            QString filename=QFileDialog::getOpenFileName(
                            this,
                            tr("Open file") ,
                            "/home/pi/Desktop",
                            tr("All files(*.png *.jpg)"));
                            
                            QMessageBox::information(this,tr("Filename"),filename);
                            if(QString::compare(filename,QString())!=0)
                            {
                                QImage image;
                                bool valid=image.load(filename);
                                if(valid)
                                {
                                    image=image.scaledToWidth(ui->Picture->width(),Qt::SmoothTransformation);
                                    ui->Picture->setPixmap(QPixmap::fromImage(image));
                            
                                }
                            void MainWindow::onTrackball_clicked(int,void*)
                            {
                            

                            void MainWindow::onTrackball_clicked(int,void*) is inside void MainWindow::on_pushButton_5_clicked() - this is invalid!

                            https://forum.qt.io/topic/113070/qt-code-of-conduct

                            G 1 Reply Last reply
                            1
                            • jsulmJ jsulm

                              @gauravsharma0190 Take a look at this:

                              
                              void MainWindow::on_pushButton_5_clicked()
                              {
                              QString filename=QFileDialog::getOpenFileName(
                              this,
                              tr("Open file") ,
                              "/home/pi/Desktop",
                              tr("All files(*.png *.jpg)"));
                              
                              QMessageBox::information(this,tr("Filename"),filename);
                              if(QString::compare(filename,QString())!=0)
                              {
                                  QImage image;
                                  bool valid=image.load(filename);
                                  if(valid)
                                  {
                                      image=image.scaledToWidth(ui->Picture->width(),Qt::SmoothTransformation);
                                      ui->Picture->setPixmap(QPixmap::fromImage(image));
                              
                                  }
                              void MainWindow::onTrackball_clicked(int,void*)
                              {
                              

                              void MainWindow::onTrackball_clicked(int,void*) is inside void MainWindow::on_pushButton_5_clicked() - this is invalid!

                              G Offline
                              G Offline
                              gauravsharma0190
                              wrote on last edited by
                              #40

                              @jsulm
                              but i am not defining ontrack_clicked in push button its different.

                              mrjjM 1 Reply Last reply
                              0
                              • G gauravsharma0190

                                @jsulm
                                but i am not defining ontrack_clicked in push button its different.

                                mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by
                                #41

                                @gauravsharma0190

                                Are you sure ?
                                it really, really looks like you do :)

                                G 1 Reply Last reply
                                1
                                • mrjjM mrjj

                                  @gauravsharma0190

                                  Are you sure ?
                                  it really, really looks like you do :)

                                  G Offline
                                  G Offline
                                  gauravsharma0190
                                  wrote on last edited by
                                  #42

                                  @mrjj
                                  sir i again improving it.
                                  as

                                  void MainWindow::on_pushButton_6_clicked()
                                  {
                                     /* Mat src , dst;
                                  
                                  
                                   //   char* source_window = "Source image";
                                     // char* equalized_window = "Equalized Image";
                                  
                                      /// Load image
                                      src = imread( "/home/pi/Desktop/b4.jpg" );
                                  
                                  
                                  
                                      /// Convert to grayscale
                                      cvtColor( src, src, CV_BGR2GRAY );
                                  
                                      /// Apply Histogram Equalization
                                      equalizeHist( src, dst );
                                  
                                      /// Display results
                                      namedWindow( "source", CV_WINDOW_NORMAL );
                                      namedWindow( "equalized", CV_WINDOW_NORMAL );
                                  
                                      imshow( "source", src );
                                      imshow( "equalized", dst );
                                  
                                      /// Wait until user exits the program
                                    //  waitKey(0);*/
                                  
                                  
                                  
                                      Mat src_base, hsv_base;
                                      Mat src_test1, hsv_test1;
                                      Mat src_test2, hsv_test2;
                                      Mat hsv_half_down;
                                  
                                      /// Load three images with different environment settings
                                  
                                      src_base = imread( "/home/pi/Desktop/b4.jpg" );
                                      src_test1 = imread( "/home/pi/Desktop/b4.jpg" );
                                      src_test2 = imread( "/home/pi/Desktop/b3.jpg" );
                                  
                                      /// Convert to HSV
                                      cvtColor( src_base, hsv_base, COLOR_BGR2HSV );
                                      cvtColor( src_test1, hsv_test1, COLOR_BGR2HSV );
                                      cvtColor( src_test2, hsv_test2, COLOR_BGR2HSV );
                                  
                                      hsv_half_down = hsv_base( Range( hsv_base.rows/2, hsv_base.rows - 1 ), Range( 0, hsv_base.cols - 1 ) );
                                  
                                      /// Using 50 bins for hue and 60 for saturation
                                      int h_bins = 50; int s_bins = 60;
                                      int histSize[] = { h_bins, s_bins };
                                  
                                      // hue varies from 0 to 179, saturation from 0 to 255
                                      float h_ranges[] = { 0, 180 };
                                      float s_ranges[] = { 0, 256 };
                                  
                                      const float* ranges[] = { h_ranges, s_ranges };
                                  
                                      // Use the o-th and 1-st channels
                                      int channels[] = { 0, 1 };
                                  
                                  
                                      /// Histograms
                                      MatND hist_base;
                                      MatND hist_half_down;
                                      MatND hist_test1;
                                      MatND hist_test2;
                                  
                                      /// Calculate the histograms for the HSV images
                                      calcHist( &hsv_base, 1, channels, Mat(), hist_base, 2, histSize, ranges, true, false );
                                      normalize( hist_base, hist_base, 0, 1, NORM_MINMAX, -1, Mat() );
                                  
                                      calcHist( &hsv_half_down, 1, channels, Mat(), hist_half_down, 2, histSize, ranges, true, false );
                                      normalize( hist_half_down, hist_half_down, 0, 1, NORM_MINMAX, -1, Mat() );
                                  
                                      calcHist( &hsv_test1, 1, channels, Mat(), hist_test1, 2, histSize, ranges, true, false );
                                      normalize( hist_test1, hist_test1, 0, 1, NORM_MINMAX, -1, Mat() );
                                  
                                      calcHist( &hsv_test2, 1, channels, Mat(), hist_test2, 2, histSize, ranges, true, false );
                                      normalize( hist_test2, hist_test2, 0, 1, NORM_MINMAX, -1, Mat() );
                                  
                                      /// Apply the histogram comparison methods
                                      for( int i = 0; i < 4; i++ )
                                      {
                                          int compare_method = i;
                                          double base_base = compareHist( hist_base, hist_base, compare_method );
                                          double base_half = compareHist( hist_base, hist_half_down, compare_method );
                                          double base_test1 = compareHist( hist_base, hist_test1, compare_method );
                                          double base_test2 = compareHist( hist_base, hist_test2, compare_method );
                                  
                                          printf( " Method [%d] Perfect, Base-Half, Base-Test(1), Base-Test(2) : %f, %f, %f, %f \n", i, base_base, base_half , base_test1, base_test2 );
                                      }
                                  
                                  
                                  
                                  
                                      }
                                  
                                  
                                  
                                  void MainWindow::on_onTrackball_clicked()
                                  {
                                  
                                      Mat src, src_gray;
                                      Mat dst, detected_edges;
                                  
                                      int edgeThresh = 1;
                                      int lowThreshold;
                                      int const max_lowThreshold = 100;
                                      int ratio = 3;
                                      int kernel_size = 3;
                                      char* window_name = "Edge Map";
                                  
                                  
                                  
                                      /// Load image
                                      src = imread( "/home/pi/Desktop/b4.jpg");
                                       /// Create a matrix of the same type and size as src (for dst)
                                  
                                  
                                  
                                      dst.create( src.size(), src.type() );
                                  
                                      /// Convert the image to grayscale
                                      cvtColor( src, src_gray, CV_BGR2GRAY );
                                  
                                      /// Create a window
                                      namedWindow( window_name, CV_WINDOW_NORMAL );
                                  
                                      /// Create a Trackbar for user to enter threshold
                                    //  createTrackbar( "Min Threshold:", window_name, &lowThreshold, max_lowThreshold, CannyThreshold );
                                  
                                      /// Show the image
                                      CannyThreshold(0, 0);
                                  
                                  
                                      /// Separate the image in 3 places ( B, G and R )
                                      vector<Mat> bgr_planes;
                                      split( src, bgr_planes );
                                  
                                      /// Establish the number of bins
                                      int histSize = 256;
                                  
                                      /// Set the ranges ( for B,G,R) )
                                      float range[] = { 0, 256 } ;
                                      const float* histRange = { range };
                                  
                                      bool uniform = true;
                                      bool accumulate = false;
                                  
                                      Mat b_hist, g_hist, r_hist;
                                  
                                      /// Compute the histograms:
                                      calcHist( &bgr_planes[0], 1, 0, Mat(), b_hist, 1, &histSize, &histRange, uniform, accumulate );
                                      calcHist( &bgr_planes[1], 1, 0, Mat(), g_hist, 1, &histSize, &histRange, uniform, accumulate );
                                      calcHist( &bgr_planes[2], 1, 0, Mat(), r_hist, 1, &histSize, &histRange, uniform, accumulate );
                                  
                                      // Draw the histograms for B, G and R
                                      int hist_w = 512; int hist_h = 400;
                                     int bin_w = cvRound( (double) hist_w/histSize );
                                  
                                      Mat histImage( hist_h, hist_w, CV_8UC3, Scalar( 0,0,0) );
                                  
                                      /// Normalize the result to [ 0, histImage.rows ]
                                      normalize(b_hist, b_hist, 0, histImage.rows, NORM_MINMAX, -1, Mat() );
                                      normalize(g_hist, g_hist, 0, histImage.rows, NORM_MINMAX, -1, Mat() );
                                      normalize(r_hist, r_hist, 0, histImage.rows, NORM_MINMAX, -1, Mat() );
                                  
                                      /// Draw for each channel
                                      for( int i = 1; i < histSize; i++ )
                                      {
                                          line( histImage, Point( bin_w*(i-1), hist_h - cvRound(b_hist.at<float>(i-1)) ) ,
                                                           Point( bin_w*(i), hist_h - cvRound(b_hist.at<float>(i)) ),
                                                           Scalar( 255, 0, 0), 2, 8, 0  );
                                          line( histImage, Point( bin_w*(i-1), hist_h - cvRound(g_hist.at<float>(i-1)) ) ,
                                                           Point( bin_w*(i), hist_h - cvRound(g_hist.at<float>(i)) ),
                                                           Scalar( 0, 255, 0), 2, 8, 0  );
                                          line( histImage, Point( bin_w*(i-1), hist_h - cvRound(r_hist.at<float>(i-1)) ) ,
                                                           Point( bin_w*(i), hist_h - cvRound(r_hist.at<float>(i)) ),
                                                           Scalar( 0, 0, 255), 2, 8, 0  );
                                      }
                                  
                                      /// Display
                                      namedWindow("calcHist Demo", CV_WINDOW_AUTOSIZE );
                                      imshow("calcHist Demo", histImage );
                                    imwrite("calcHist Demo2.jpg", histImage);
                                      waitKey(-1);
                                  
                                  
                                    }
                                  
                                  
                                  ...
                                  This is new improved code .but there are error or build issue
                                  1.In member function'void mainwindow::on_on_trackball_clicked()
                                  ****canny Thresol was not declered in this scope .(function which i declare and define in .h and .c file.
                                  unsed variable 'edgeThresh'.
                                  1 Reply Last reply
                                  0
                                  • mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #43

                                    @gauravsharma0190 said:

                                    CannyThreshold

                                    this function ?
                                    CannyThreshold
                                    that you call with
                                    CannyThreshold(0, 0);

                                    and you do include the .h file where its defined?

                                    G 1 Reply Last reply
                                    0
                                    • mrjjM mrjj

                                      @gauravsharma0190 said:

                                      CannyThreshold

                                      this function ?
                                      CannyThreshold
                                      that you call with
                                      CannyThreshold(0, 0);

                                      and you do include the .h file where its defined?

                                      G Offline
                                      G Offline
                                      gauravsharma0190
                                      wrote on last edited by
                                      #44

                                      @mrjj
                                      it is defined as

                                      ///ontrack.h///
                                      
                                      #ifndef __ONTRACK_h
                                      #define __ONTRACK_h
                                      void cannyThresold(int,void*);
                                      #endif
                                      ......
                                      
                                      ///ontrack.cpp
                                      #include "ontrack.h"
                                      #include<opencv2/opencv.hpp>
                                      #include <opencv2/highgui/highgui.hpp>
                                      #include <opencv2/core/core.hpp>
                                      void CannyThreshold(int, void*)
                                      {
                                      /// Reduce noise with a kernel 3x3
                                      blur( src_gray, detected_edges, Size(3,3) );
                                      /// Canny detector
                                      Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );
                                      
                                      /// Using Canny's output as a mask, we display our result
                                      dst = Scalar::all(0);
                                      
                                      src.copyTo( dst, detected_edges);
                                      imshow( window_name, dst );
                                      }
                                      

                                      .....
                                      thus i include ontrack.h in mainwindow.cpp code.
                                      but error occurs.
                                      Why??
                                      i can't understand.

                                      jsulmJ 1 Reply Last reply
                                      0
                                      • mrjjM Offline
                                        mrjjM Offline
                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #45

                                        I dont understand either.
                                        Seems fine.
                                        try to define a test function
                                        as in
                                        ontrack.h
                                        void mytest();
                                        and call that from main.

                                        If that is still not known, it means that mainwinow do not really include ontrack.h for some reason.

                                        1 Reply Last reply
                                        0
                                        • G gauravsharma0190

                                          @mrjj
                                          it is defined as

                                          ///ontrack.h///
                                          
                                          #ifndef __ONTRACK_h
                                          #define __ONTRACK_h
                                          void cannyThresold(int,void*);
                                          #endif
                                          ......
                                          
                                          ///ontrack.cpp
                                          #include "ontrack.h"
                                          #include<opencv2/opencv.hpp>
                                          #include <opencv2/highgui/highgui.hpp>
                                          #include <opencv2/core/core.hpp>
                                          void CannyThreshold(int, void*)
                                          {
                                          /// Reduce noise with a kernel 3x3
                                          blur( src_gray, detected_edges, Size(3,3) );
                                          /// Canny detector
                                          Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );
                                          
                                          /// Using Canny's output as a mask, we display our result
                                          dst = Scalar::all(0);
                                          
                                          src.copyTo( dst, detected_edges);
                                          imshow( window_name, dst );
                                          }
                                          

                                          .....
                                          thus i include ontrack.h in mainwindow.cpp code.
                                          but error occurs.
                                          Why??
                                          i can't understand.

                                          jsulmJ Offline
                                          jsulmJ Offline
                                          jsulm
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #46

                                          @gauravsharma0190 You call it like this CannyThreshold(0, 0); and in ontrack.cpp it is defined like void CannyThreshold(int, void*). But in ontrack.h it is void cannyThresold(int,void*); please fix the name of the function.

                                          https://forum.qt.io/topic/113070/qt-code-of-conduct

                                          mrjjM G 2 Replies Last reply
                                          1

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