QT下調用攝像頭(opencv2.4.4)

項目pro文件：

#-------------------------------------------------
#
# Project created by QtCreator 2014-01-18T14:39:58
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = opencv_vedio
TEMPLATE = app
INCLUDEPATH +=D:\program\opencv\build\include\
INCLUDEPATH +D:\program\opencv\build\include\opencv\
INCLUDEPATH +=D:\program\opencv\build\include\opencv2\

CONFIG(debug,debug|release) {
LIBS += -LD:\program\opencv\build\x86\vc10\lib \
    -lopencv_core244d \
    -lopencv_highgui244d \
    -lopencv_imgproc244d \
    -lopencv_features2d244d \
    -lopencv_calib3d244d
} else {
LIBS += -LD:\program\opencv\build\x86\vc10\lib \
    -lopencv_core244 \
    -lopencv_highgui244 \
    -lopencv_imgproc244 \
    -lopencv_features2d244 \
    -lopencv_calib3d244
}

SOURCES += main.cpp\
        dialog.cpp

HEADERS  += dialog.h

FORMS    += dialog.ui

dialog.h：

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <opencv/cv.h>
#include <opencv/highgui.h>
#include <QTimer>
#include <QPixmap>
namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

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

private:
    Ui::Dialog *ui;
    CvCapture *capture; //highgui 里提供的一個專門處理攝像頭圖像的結構體
    IplImage *frame; //攝像頭每次抓取的圖像為一幀，使用該指針指向一幀圖像的內存空間
    QTimer *timer; //定時器用於定時取幀，上面說的隔一段時間就去取就是用這個實現。
private slots:
    void getFrame(); //實現定時從攝像頭取圖並顯示在label上的功能。






};

#endif // DIALOG_H

dialog.cpp：

#include "dialog.h"
#include "ui_dialog.h"
#include <QDebug>
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    timer = new QTimer(this);
    capture = cvCaptureFromCAM(0); //cvCaptureFromCAM其實是一個宏，就是cvCreateCameraCapture的別名，0代表第一個攝像頭。-1代表默認攝像頭。
    if(capture==NULL){
          qDebug()<<"error!";
        }
    timer->start(50); //1000為1秒，50毫秒去取一幀
    connect(timer,SIGNAL(timeout()),this,SLOT(getFrame())); //超時就去取
}

Dialog::~Dialog()
{
    timer->stop(); //停止取幀
    cvReleaseCapture(&capture); //釋放資源是個好習慣
    delete ui;
}
void Dialog::getFrame(){
    frame = cvQueryFrame(capture); //從攝像頭取幀
    QImage image = QImage((const uchar*)frame->imageData, frame->width, frame->height, QImage::Format_RGB888).rgbSwapped(); //簡單地轉換一下為Image對象，rgbSwapped是為了顯示效果色彩好一些。
    ui->label->setPixmap(QPixmap::fromImage(image));
}

效果：

 

工程源碼：

http://pan.baidu.com/s/1mg4XucS