假如生成的opencv路徑是：/usr/local/opencv4.12
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 += target# 以下是opencv的引用INCLUDEPATH += /usr/local/opencv4.12/include\/usr/local/opencv4.12/include/opencv4 \/usr/local/opencv4.12/include/opencv4/opencv2LIBS += /usr/local/opencv4.12/lib/libopencv_*.so \# /home/hwiki/OpenCV/install/lib/libopencv_core.so \# /home/hwiki/OpenCV/install/lib/libopencv_imgproc.so \# /home/hwiki/OpenCV/install/lib/libopencv_imgcodecs.so
#include "mainwindow.h"
#include "ui_mainwindow.h"#include <QFileDialog>
#include <QMessageBox>
#include <QPixmap>#include <opencv2/opencv.hpp>
#include <opencv2/imgproc.hpp>using namespace cv; // 引入opencv的命名空間
using namespace std;// 全局變量，用于存儲原始圖像
cv::Mat g_img_input;MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::on_pushButton_clicked()
{QString filename = QFileDialog::getOpenFileName(this,"打開圖像文件",".","Image Files (*.bmp *.png *.jpg *.jpeg)");if (filename.isEmpty()) {QMessageBox::information(this, "提示", "未選擇文件或文件打開失敗!");return;}// 2. 使用 OpenCV 讀取圖像g_img_input = cv::imread(filename.toStdString()); // 在Ubuntu上，toStdString() 通常足夠if (g_img_input.empty()) {QMessageBox::information(this, "提示", "無法讀取圖像文件，請檢查文件路徑和格式!");return;}// 3. 轉換顏色空間 (OpenCV 讀取的是 BGR, Qt 顯示需要 RGB)cv::Mat img_rgb;cv::cvtColor(g_img_input, img_rgb, cv::COLOR_BGR2RGB);// 4. 將 cv::Mat 轉換為 QImage// 注意：img_rgb 的數據必須是連續的，通常 imread 讀取的是連續的QImage qimg(img_rgb.data,img_rgb.cols,img_rgb.rows,static_cast<int>(img_rgb.step), // 每行字節數QImage::Format_RGB888);// 5. 將 QImage 轉換為 QPixmap 并顯示在 QLabel 上QPixmap pixmap = QPixmap::fromImage(qimg);// 縮放圖片以適應 QLabel 大小，同時保持原始比例QPixmap scaledPixmap = pixmap.scaled(ui->imageLabel->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);ui->imageLabel->setPixmap(scaledPixmap); // 假設您的 QLabel 名為 imageLabel// 設置 QLabel 的對齊方式，使圖片居中顯示ui->imageLabel->setAlignment(Qt::AlignCenter);// 6. 清理 (Mat 對象在函數結束時會自動釋放)// img_input, img_rgb 會自動析構
}void MainWindow::on_pushButton_gray_clicked()
{// 直接寫在這里// 檢查是否有已加載的圖像if (g_img_input.empty()) {QMessageBox::information(this, "提示", "請先打開一個圖像文件!");return;}// 將圖像轉換為灰度圖cv::Mat img_gray;cv::cvtColor(g_img_input, img_gray, cv::COLOR_BGR2GRAY);// 將灰度圖轉換為 QImage (灰度格式)QImage qimg(img_gray.data,img_gray.cols,img_gray.rows,static_cast<int>(img_gray.step),QImage::Format_Grayscale8);// 將 QImage 轉換為 QPixmap 并顯示在 QLabel 上QPixmap pixmap = QPixmap::fromImage(qimg);// 縮放圖片以適應 QLabel 大小，同時保持原始比例QPixmap scaledPixmap = pixmap.scaled(ui->imageLabel->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);ui->imageLabel->setPixmap(scaledPixmap);// 設置 QLabel 的對齊方式，使圖片居中顯示ui->imageLabel->setAlignment(Qt::AlignCenter);
}
