Declaration of function and use it

[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.

[jsulm]

@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).

[jsulm]

@gauravsharma0190 Shouldn't

void CannyThreshold(int, void)

be

void CannyThreshold(int, void*)

?

[gauravsharma0190]

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

[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.

[gauravsharma0190]

@gauravsharma0190 said:

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

[jsulm]

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

[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!

[gauravsharma0190]

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

[mrjj]

@gauravsharma0190

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

[gauravsharma0190]

@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'.

[mrjj]

@gauravsharma0190 said:

CannyThreshold

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

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

[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.

[mrjj]

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.

[jsulm]

@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.

[mrjj]

@jsulm
heh Good spotted. completely missed "old" :)

[gauravsharma0190]

@mrjj
I fix canny as Canny in .h file
but again error occurs.

[gauravsharma0190]

@jsulm
Hey i fixed it .But again error.

[jsulm]

@gauravsharma0190 "But again error" - why don't you say what error you get now?

[gauravsharma0190]

@jsulm
yes it tells undefined reference to 'CannyThresold(int,void*)'.
collect2:error ld returned 1 exit status.