（4程序框架）从零开始的嵌入式图像图像处理(PI+QT+OpenCV)实战演练

# ifndef CLICKEDLABEL_H
# define CLICKEDLABEL_H
# include <QWidget >
# include <QLabel >
class ClickedLabel : public QLabel
{
   Q_OBJECT
    public :
       ClickedLabel(QWidget *parent = 0) : QLabel(parent){}
        ~ClickedLabel() {}
   signals :
        void clicked(ClickedLabel * click); // ????
    protected :
        void mouseReleaseEvent(QMouseEvent *); // ?????????
};
# endif // CLICKEDLABEL_H

# include "clickedlabel.h"

void ClickedLabel : :mouseReleaseEvent(QMouseEvent *)
{
    emit clicked( this);
}

# include "mainwindow.h"
# include <QApplication >


int main( int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

# include "mainwindow.h"
# include "ui_mainwindow.h"
using namespace cv;
Mat src;
Mat gray;
Mat tmp;
Mat dst;

MainWindow : :MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui( new Ui : :MainWindow)
{
    ui - >setupUi( this);
    timer   = new QTimer( this);
    imag     = new QImage();        
    connect(timer, SIGNAL(timeout()), this, SLOT(readFarme())); 
    bMethod = false;
    on_pushButton_clicked();
    clickLabel = new ClickedLabel( this);
    clickLabel - >setGeometry( 0, 0, 400, 400);
    connect(clickLabel,SIGNAL(clicked(ClickedLabel *)), this,SLOT(on_pushButton_3_clicked()));
    clickLabel2 = new ClickedLabel( this);
    clickLabel2 - >setGeometry( 400, 0, 400, 400);
    connect(clickLabel2,SIGNAL(clicked(ClickedLabel *)), this,SLOT(on_pushButton_2_clicked()));
}

MainWindow : : ~MainWindow()
{
    delete ui;
}
void MainWindow : :on_MainWindow_iconSizeChanged( const QSize &iconSize)
{

}
//Open camera
void MainWindow : :on_pushButton_clicked()
{
    videocapture   = new VideoCapture( 0);
    timer - >start( 33);
}
void MainWindow : :readFarme()
{
    videocapture - >read(matFrame);
    if(bMethod)
    {
        cvtColor(matFrame,tmp,COLOR_BGR2GRAY);
        Canny(tmp,dst, 30, 255);
    }
    else
    {
        dst = matFrame.clone();
    }
    QPixmap qpixmap = Mat2QImage(dst);
    clickLabel - >setPixmap(qpixmap);
}
//capture
void MainWindow : :on_pushButton_2_clicked()
{
    QPixmap qpixmap = Mat2QImage(dst);
    //ui->label_2->setPixmap(qpixmap);
     clickLabel2 - >setPixmap(qpixmap);
}
//action
void MainWindow : :on_pushButton_3_clicked()
{
      bMethod = !bMethod;
}
//exit
void MainWindow : :on_pushButton_4_clicked()
{
    timer - >stop();         // ???????
    videocapture - >release();
}
//////////////////////////helper??//////////////////////////////////////////////////
QPixmap Mat2QImage(Mat src)
{
    QImage img;
    if(src.channels() == 3)
    {
        cvtColor( src, tmp, CV_BGR2RGB );
        img = QImage( ( const unsigned char *)(tmp.data), tmp.cols, tmp.rows, QImage : :Format_RGB888 );
    }
    else
    {
        img = QImage( ( const unsigned char *)(src.data), src.cols, src.rows, QImage : :Format_Indexed8 );
    }
    QPixmap qimg = QPixmap : :fromImage(img) ;
    return qimg;
}