Question

我正在尝试使用opencv和qt实现实时人脸检测程序。代码是 mainwindow.h

 #include <QMainWindow>
 #include <opencv/cv.h>
 #include <opencv/highgui.h>
 #include <QLabel>

 namespace Ui {
 class MainWindow;
 }

 class MainWindow : public QMainWindow
  {
   Q_OBJECT
   public:
 explicit MainWindow(QWidget *parent = 0);
~MainWindow();
Ui::MainWindow* _ui;
CvCapture* _capture;
IplImage*       _img;
CvHaarClassifierCascade* _cascade;
CvMemStorage*   _storage;
QList<CvScalar>  _colors;
QPixmap*         _pixmap;
QTimer*          _timer;
QLabel* labelCapture;
private slots:
void on_actionCapture_triggered();
 };
//#endif // MAINWINDOW_H

的main.cpp

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

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

   return a.exec();
    }

mainwindow.cpp

    #include "mainwindow.h"
    #include "ui_mainwindow.h"
    #include "opencv/cv.h"
    #include "opencv/highgui.h"
    #include "opencv/cvaux.h"
    #include <QTimer>
    #include <QLabel>

    MainWindow::MainWindow(QWidget *parent) :
  QMainWindow(parent),
  _ui(new Ui::MainWindow)
  {
_ui->setupUi(this);
QLabel* labelCapture;
_capture = cvCaptureFromCAM( 0 );
_cascade = (CvHaarClassifierCascade*)cvLoad("haarcascade_frontalface_alt2.xml");
_storage = cvCreateMemStorage(0);

_colors << cvScalar(0.0,0.0,255.0) << cvScalar(0.0,128.0,255.0)
        << cvScalar(0.0,255.0,255.0) << cvScalar(0.0,255.0,0.0)
        << cvScalar(255.0,128.0,0.0) << cvScalar(255.0,255.0,0.0)
        << cvScalar(255.0,0.0,0.0) << cvScalar(255.0,0.0,255.0);

  _timer = new QTimer(this);
  connect(_timer, SIGNAL(timeout()), this, SLOT(on_actionCapture_triggered()));
  _timer->start(10);
  labelCapture=new QLabel();
   }

  MainWindow::~MainWindow()
  {
cvReleaseImage(&_img);
cvReleaseCapture(&_capture);
delete _ui;
  }

   void MainWindow::on_actionCapture_triggered()
   {
// Query camera for next frame
_img = cvQueryFrame( _capture );

if (_img)
{
    // Detect objects
    cvClearMemStorage( _storage );

    CvSeq* objects = cvHaarDetectObjects(_img,
                                         _cascade,
                                         _storage,
                                         1.1,
                                         3,
                                         CV_HAAR_DO_CANNY_PRUNING,
                                         cvSize( 100, 100 ));

    int n = (objects ? objects->total : 0);

    CvRect* r;
    // Loop through objects and draw boxes
    for( int i = 0; i < n; i++ )
    {
        r = ( CvRect* )cvGetSeqElem( objects, i );
        cvRectangle( _img,
                     cvPoint( r->x, r->y ),
                     cvPoint( r->x + r->width, r->y + r->height ),
                     _colors[i%8]
                    );
    }

    // Convert IplImage to QImage
    QImage image = QImage((const uchar *)_img->imageData,
                                         _img->width,
                                         _img->height,
                                         QImage::Format_RGB888).rgbSwapped();
    _pixmap = new QPixmap(QPixmap::fromImage(image));
     _ui->labelCapture->setPixmap(*_pixmap);
   }
   }

但是我得到以下错误...... on on on_action_capture_triggered（） class ui :: mainWindow没有名为'labelCapture'的成员请帮帮....

Answer 1

这不是OpenCV问题。你误解了Qt的基础知识。

我建议您使用Qt Creator创建新项目，然后使用Qt Creators设计器创建用户界面。所以，如果你这样做，你将拥有干净的代码与私人 Ui::MainWindow *ui，然后，使用Qt Creators设计师，创建你的行动并编码。

祝你好运！

Answer 2

如果您的表单上有A QLABEL，则将其重命名为'labelCapture'，如果没有，则必须创建一个具有相同名称的，或者您可以将代码更改为qlabel的名称。祝你好运！

使用opencv和qt进行人脸检测

2 个答案: