基于Qt+opencv实现打开图片打开摄像头关闭摄像头源码.zip

#include "mainwindow.h" #include "ui_mainwindow.h" #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> using namespace cv; MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); QList<QCameraInfo> infos2 = QCameraInfo::availableCameras(); foreach(QCameraInfo info,infos2) { qDebug()<<info.deviceName()<<":"<<info.description(); ui->comboBox->addItem((info.deviceName())); } } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_clicked() { //Mat image = imread("F:\\VS\\untitled5\\messi5.jpg"); //存放自己图像的路径 //if (image.empty()) //{ // printf("could not load image...\r\n"); //} //imshow("显示图像", image); // waitKey(); // destroyAllWindows(); // ui->setupUi(this); QString StrWidth,StrHeigth; QString filename="F:\\VS\\opencv_test\\messi5.jpg"; QImage* img=new QImage,* scaledimg=new QImage;//分别保存原图和缩放之后的图片 if(! ( img->load(filename) ) ) //加载图像 { QMessageBox::information(this, tr("打开图像失败"), tr("打开图像失败!")); delete img; return; } int Owidth=img->width(),Oheight=img->height(); int Fwidth,Fheight; //缩放后的图片大小 ui->label->setGeometry(0,0,400,300); int Mul; //记录图片与label大小的比例，用于缩放图片 if(Owidth/400>=Oheight/300) Mul=Owidth/400; else Mul=Oheight/300; Fwidth=Owidth/Mul; Fheight=Oheight/Mul; *scaledimg=img->scaled(Fwidth,Fheight,Qt::KeepAspectRatio); ui->label->setPixmap(QPixmap::fromImage(*scaledimg)); } void MainWindow::on_bstart_clicked() { ca2=new QCamera(ui->comboBox->currentText().toUtf8(),this); ui->widget->show(); capture2 = new QCameraImageCapture(ca2); connect(capture2,SIGNAL(imageCaptured(int,QImage)),this,SLOT(show_pic(int,QImage))); QCameraViewfinder *v2 =new QCameraViewfinder(ui->widget); v2->resize(ui->widget->size()); ca2->setViewfinder(v2); v2->show(); ca2->start(); } void MainWindow::on_bstop_clicked() { ca2->stop(); ui->widget->hide(); }