#-------------------------------------------------

#

# 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

#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 里提供的一个专门处理摄像头图像的结构体

    IplImage *frame; //摄像头每次抓取的图像为一帧，使用该指针指向一帧图像的内存空间

    QTimer *timer; //定时器用于定时取帧，上面说的隔一段时间就去取就是用这个实现。

private slots:

    void getFrame(); //实现定时从摄像头取图并显示在label上的功能。

};

#endif // DIALOG_H

#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其实是一个宏，就是cvCreateCameraCapture的别名，0代表第一个摄像头。-1代表默认摄像头。

    if(capture==NULL){

          qDebug()<<"error!";

        }

    timer->start(50); //1000为1秒，50毫秒去取一帧

    connect(timer,SIGNAL(timeout()),this,SLOT(getFrame())); //超时就去取

}

Dialog::~Dialog()

{

    timer->stop(); //停止取帧

    cvReleaseCapture(&capture); //释放资源是个好习惯

    delete ui;

}

void Dialog::getFrame(){

    frame = cvQueryFrame(capture); //从摄像头取帧

    QImage image = QImage((const uchar*)frame->imageData, frame->width, frame->height, QImage::Format_RGB888).rgbSwapped(); //简单地转换一下为Image对象，rgbSwapped是为了显示效果色彩好一些。

    ui->label->setPixmap(QPixmap::fromImage(image));

}