具体实现
qtcameratest01.h修改如下：
pragma once
include <QtWidgets/QMainWindow>
include "ui_qtcameratest01.h"
include <opencv2/core.hpp>
include <opencv2/highgui.hpp>
include <opencv2/videoio.hpp> // for camera
using namespace cv;
class qtcameratest01 : public QMainWindow
{
Q_OBJECT
public:
qtcameratest01(QWidget *parent = Q_NULLPTR);private:
Ui::qtcameratest01Class ui;
QTimer *timer;
Mat frame;
QImage image;
VideoCapture cap1;
private slots:
void opencam();
void nextFrame();
void closeCamara();
void camshot();};
static QImage Mat2QImage(Mat& image);
qtcameratest01.cpp文件修改如下：
include "qtcameratest01.h"
include
include
include <opencv2/core.hpp>
include <opencv2/highgui.hpp>
include <opencv2/videoio.hpp> // for camera
include <opencv.hpp>
using namespace cv;
qtcameratest01::qtcameratest01(QWidget *parent)
: QMainWindow(parent){
// 初始化
timer = new QTimer(this);
timer->stop();
ui.setupUi(this);
connect(ui.OpenCamBtn, SIGNAL(clicked()), this, SLOT(opencam()));
connect(timer, SIGNAL(timeout()), this, SLOT(nextFrame()));
connect(ui.CloseCamBtn, SIGNAL(clicked()), this, SLOT(closeCamara()));
connect(ui.CamshotBtn, SIGNAL(clicked()), this, SLOT(camshot()));}
void qtcameratest01::opencam()
{
if (cap1.isOpened())
cap1.release();
double rate = cap1.get(CV_CAP_PROP_FPS);
try
{
cap1.open(0);
cap1 >> frame;
if (!frame.empty())
{
timer->setInterval(rate);
timer->start();
}
}
catch (const std::exception&)
{
QMessageBox::critical(NULL, "ERROR", "打开失败",QMessageBox::Close);
}}
static QImage Mat2QImage(Mat& image)
{
QImage img;
if (image.channels() == 3) {
cvtColor(image, image, CV_BGR2RGB);
img = QImage((const unsigned char *)(image.data), image.cols, image.rows,
image.cols*image.channels(), QImage::Format_RGB888);
}
else if (image.channels() == 1) {
img = QImage((const unsigned char *)(image.data), image.cols, image.rows,
image.cols*image.channels(), QImage::Format_ARGB32);
}
else {
img = QImage((const unsigned char *)(image.data), image.cols, image.rows,
image.cols*image.channels(), QImage::Format_RGB888);
}
return img;}
void qtcameratest01::nextFrame()
{
cap1 >> frame;
if (!frame.empty())
{
image = Mat2QImage(frame);
QImage* imgScaled = new QImage;
QImage* imgc = ℑ
*imgScaled = imgc->scaled(ui.campicreal->width(), ui.campicreal->height(), Qt::KeepAspectRatio);
ui.campicreal->setPixmap(QPixmap::fromImage(*imgScaled));
}
}
void qtcameratest01::closeCamara()
{
timer->stop();//停止读取数据。
cap1.release();//释放内存； }
void qtcameratest01::camshot()
{
QImage* imgScaled = new QImage;
QImage* imgc = ℑ
*imgScaled = imgc->scaled(ui.campicreal->width(), ui.campicreal->height(), Qt::KeepAspectRatio);
ui.campicshot->setPixmap(QPixmap::fromImage(*imgScaled));}
