【opencv4.5.1版本】下載exe解壓即可。。。https://opencv.org/releases/page/2/
【qt5.15.2】

pro文件

QT       += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++17# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \mainwindow.cppHEADERS += \mainwindow.hFORMS += \mainwindow.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += targetCONFIG(release, debug|release) {LIBS += -L$$PWD/../opencv/build/x64/vc15/lib/ -lopencv_world451opencv.files += $$PWD/sdk/opencv/bin/opencv_world451.dllopencv.path += $$OUT_PWD/Release
}
else {LIBS += -L$$PWD/../opencv/build/x64/vc15/lib/ -lopencv_world451dopencv.files += $$PWD/sdk/opencv/bin/opencv_world451d.dllopencv.path += $$OUT_PWD/Debug
}COPIES += opencvINCLUDEPATH += E:\opencv\opencv\build\include
DEPENDPATH += E:\opencv\opencv\build\include

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <opencv2/opencv.hpp>
using namespace cv;QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private:QString m_imgPath = "";private slots:void on_pushButton_clicked();void showImg();private:Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFileDialog>
#include <QDebug>MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::on_pushButton_clicked()
{m_imgPath = QFileDialog::getOpenFileName(this, tr("Open Image"), QCoreApplication::applicationDirPath(), tr("*.png *.jpg"));   //打開圖片文件，選擇圖片qDebug() << "filename: " << m_imgPath;showImg();
}void MainWindow::showImg()
{QFile file(m_imgPath);if (!file.open(QIODevice::ReadOnly)){qDebug() << u8"文件打開失敗";return;}qDebug() << u8"文件讀取成功";// 獲取文件大小qint64 fileSize = file.size();// 讀取文件字節到緩沖區QByteArray buffer;buffer.resize(fileSize);QDataStream in(&file);in.readRawData(buffer.data(), fileSize);// 將緩沖區轉換為cv::Matcv::Mat image = cv::imdecode(cv::_InputArray(buffer.constData(), buffer.size()), cv::IMREAD_UNCHANGED);if (image.empty()){qDebug() << u8"無法解碼圖像文件";return;}// 繼續處理圖像cv::cvtColor(image, image, cv::COLOR_BGR2RGB);QImage disimage = QImage(image.data, image.cols, image.rows,image.step, QImage::Format_RGB888);ui->oldlabel->setPixmap(QPixmap::fromImage(disimage));ui->oldlabel->setScaledContents(true);
}

最后進行編譯部署：
https://blog.csdn.net/qq_34974229/article/details/134872879?spm=1001.2014.3001.5502