从零开始的嵌入式图像图像处理(PI+QT+OpenCV)实战演练（3）

#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);
    // ??????????timeout()??
    timer->start(33);
}
//????Frame??
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);
    // ??????label?
    //ui->label->setPixmap(qpixmap);
    clickLabel->setPixmap(qpixmap);
}

//capture
void MainWindow::on_pushButton_2_clicked()
{
    // ????
    QPixmap qpixmap = Mat2QImage(dst);
    // ??????label?
    //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;
    //??QT?????????
    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;
}