一个简单的YOLO格式图片标注查看工具 Qt界面实现

如果有比《一个简单的YOLO格式图片标注工具 Qt界面实现》更无聊的，那应该就是本文了8。
该代码实现功能是YOLO格式图片标注查看，打开一个存放图片的文件夹，和一个存放YOLO格式标签的文件夹，在图片上可视化矩形框。

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include 
#include 
#include 
#include 
#include 

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QString imagePath;
    QString imagesPath;
    QStringList imagesList;
    QString labelPath;
    QString labelsPath;
    QStringList labelsList;
    int num = 0;

private slots:
    void Open();
    void Next();
    void readtxt(QFile& file, cv::Mat image);
};

#endif // MAINWINDOW_H

main.cpp

#include "mainwindow.h"
#include 

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 

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QAction *openAction = new QAction;
    openAction->setShortcut(QKeySequence(tr("Ctrl+O")));
    ui->toolBar->addAction(openAction);
    connect(openAction, SIGNAL(triggered()), this, SLOT(Open()));

    QAction *nextAction = new QAction;
    nextAction->setShortcut(QKeySequence(tr("Right")));
    ui->toolBar->addAction(nextAction);
    connect(nextAction, SIGNAL(triggered()), this, SLOT(Next()));
}

MainWindow::~MainWindow()
{
    delete ui;
}

QStringList getImageList(QString path)
{
    QStringList imagesList;
    QDir dir(path);
    if (!dir.exists())
    {
        qDebug() << "path is non-existent!";
        return imagesList;
    }
    dir.setFilter(QDir::Files | QDir::NoSymLinks);
    QStringList filters;
    filters << "*.bmp" << "*.jpg" << "*png";
    dir.setNameFilters(filters);
    imagesList = dir.entryList();
    return imagesList;
}

QImage MatToImage(cv::Mat &mat) //Mat转QImage
{
    switch(mat.type())
    { //QIamge 构造函数, ((const uchar *data, 宽(列),高(行), 一行共多少个（字节）通道，宽度*字节数，宏参数)
        case CV_8UC1:
        {
            QImage img((uchar *)mat.data,mat.cols,mat.rows,mat.cols * 1,QImage::Format_Grayscale8);
            return img;
        }
            break;
        case CV_8UC3:   //一个像素点由三个字节组成
        {
            //cvtColor(m,m,COLOR_BGR2RGB); BGR转RGB
            QImage img((uchar *)mat.data,mat.cols,mat.rows,mat.cols * 3,QImage::Format_RGB888);
            return img.rgbSwapped(); //opencv是BGR  Qt默认是RGB  所以RGB顺序转换
        }
            break;
        case CV_8UC4:
        {
            QImage img((uchar *)mat.data,mat.cols,mat.rows,mat.cols * 4,QImage::Format_RGB32);
            return img;
        }
            break;
        default:
        {
            QImage img; //如果遇到一个图片均不属于这三种，返回一个空的图片
            return img;
        }
    }
}


void MainWindow::readtxt(QFile& file, cv::Mat image)
{
    while(!file.atEnd())
    {
        QByteArray line = file.readLine();
        QString str(line);
        QStringList strList = str.split(" ");

        float x = strList[1].toFloat();
        float y = strList[2].toFloat();
        float w = strList[3].toFloat();
        float h = strList[4].toFloat();

        int x1= (x-w/2)*image.cols;
        int y1= (y-h/2)*image.rows;
        int x2= (x+w/2)*image.cols;
        int y2= (y+h/2)*image.rows;

        cv::rectangle(image,cv::Point(x1,y1),cv::Point(x2,y2),cv::Scalar(0,0,255),2);
    }

    QImage qimage = MatToImage(image);
    ui->label->setPixmap(QPixmap::fromImage(qimage));
}

void MainWindow::Open()
{
    imagesPath = QFileDialog::getExistingDirectory(this,tr("打开"),"");
    qDebug()<<imagesPath;
    if(imagesPath.isEmpty())
        return;

    imagesList = getImageList(imagesPath);
    QString image_name = imagesList[0];
    qDebug()<<imagesList;

    imagePath = imagesPath+"/"+image_name;
    cv::Mat image = cv::imread(imagePath.toStdString());
    ui->label->setPixmap(QPixmap(imagePath));
    ui->statusbar->showMessage(imagePath+"  "+QString::number(num+1)+"/"+QString::number(imagesList.size()));

    labelsPath = QFileDialog::getExistingDirectory(this,tr("打开"),"");
    if(labelsPath.isEmpty())
        return;

    labelPath = labelsPath+"/"+image_name.replace(".bmp", ".txt").replace(".jpg", ".txt").replace(".png", ".txt");
    QFile file(labelPath);
    if(!file.open(QIODevice::ReadOnly))
        return;

   readtxt(file, image);
}

void MainWindow::Next()
{
    if(num+1>=imagesList.size())
        return;

    ui->label->clear();
    num++;

    QString image_name = imagesList[num];
    imagePath = imagesPath+"/"+image_name;
    ui->statusbar->showMessage(imagePath+"  "+QString::number(num+1)+"/"+QString::number(imagesList.size()));

    cv::Mat image = cv::imread(imagePath.toStdString());
    ui->label->setPixmap(QPixmap(imagePath));

    labelPath = labelsPath+"/"+image_name.replace(".bmp", ".txt").replace(".jpg", ".txt").replace(".png", ".txt");
    QFile file(labelPath);
    if(!file.open(QIODevice::ReadOnly))
        return;

    readtxt(file, image);
}