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專案名稱: RGB2GrayQt5OpenCV246

將下列加入專案設定(.pro)

INCLUDEPATH += J:\OpenCV-2.4.6\opencv\include\

LIBS += -LJ:\OpenCV-2.4.6\opencv\lib \
-lopencv_core246 \
-lopencv_highgui246 \
-lopencv_imgproc246 \
-lopencv_features2d246 \
-lopencv_calib3d246

將下列加入mainwindow.cpp, 讓繁體中文不再顯示亂碼

#pragma execution_character_set("utf-8")

新增一個Tab Widget

點選Tab1 修改CurrentTabText屬性值=彩色

點選Tab2 修改CurrentTabText屬性值=灰階

新增Label用來顯示影像

加入一個Push Button

將下列加入mainwindow.h

#include <QFileDialog>

#include <opencv2/core/core.hpp>

#include <opencv2/highgui/highgui.hpp>

加入兩個影像

cv::Mat img_rgb;//類別私有成員img

cv::Mat img_gray;

加入ImageUtility.h和ImageUtility.cpp

跳到clicked() Callback function

void MainWindow::on_pushButton_clicked()

{

      QString fileName = QFileDialog::getOpenFileName(this, "開啟檔案",".","檔案格式(*.png*.jpg*.jpeg*.bmp*.tiff)");

      img_rgb = cv::imread(fileName.toStdString().data()); 

      QImage qimg_rgb = Mat2QImage(img_rgb);//Mat轉換至QImage

      imshow(ui->label,qimg_rgb);//顯示彩色影像

      //----------------------------------------------------

      cv::cvtColor(img_rgb, img_gray, CV_BGR2GRAY);//彩色轉灰階

      QImage qimg_gray = Mat2QImage(img_gray);//Mat轉換至QImage

      imshow(ui->label_2, qimg_gray);//顯示灰階影像

}

----------------------------------------------------------------------------------------------------------------------------------------------------------

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QFileDialog>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv/cv.h>      // 呼叫cv::cvtColor會用到


namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;
    cv::Mat3b img_rgb;           // 類別私有成員img
    cv::Mat1b img_gray;
};

#endif // MAINWINDOW_H

----------------------------------------------------------------------------------------------------------------------------------------------------------

ImageUtility.h

#ifndefIMAGEUTILITY_H

#defineIMAGEUTILITY_H

#include <QMainWindow>

#include <QLabel>

#include <opencv2/core/core.hpp>

#include <opencv2/highgui/highgui.hpp>

QImage Mat2QImage(constcv::Mat3b&src);     //將Mat轉成QImage物件(彩色)

QImage Mat2QImage(constcv::Mat1b&src);     //將Mat轉成QImage物件(灰階)

void imshow(QLabel* const label,  const QImage  &qimg);//顯示QImage影像(在QLabel)

#endif//IMAGEUTILITY_H

----------------------------------------------------------------------------------------------------------------------------------------------------------

ImageUtility.cpp


#include "ImageUtility.h"

// Mat轉QImage
QImage Mat2QImage(const cv::Mat3b &src) {

    // 創建一個QImage, 寬:src.cols, 高src.rows, 格式:QImage::Format_ARGB32
    QImage dest(src.cols, src.rows, QImage::Format_ARGB32);

    // (1)垂直方向
    for (int y = 0; y < src.rows; ++y) {
        // 來源: 宣告一個Vec3b指標 cv::Vec3b *srcrow;
        const cv::Vec3b *srcrow = src[y];
        // 目標: 宣告一個QRgb指標  QRgb *destrow
        QRgb *destrow = (QRgb*)dest.scanLine(y);

        // (2)水平方向
        for (int x = 0; x < src.cols; ++x) {

            destrow[x] = qRgba(srcrow[x][2], srcrow[x][1], srcrow[x][0], 255);
        }
    }
    return dest;
}
//------------------------------------------------------------------------------
QImage Mat2QImage(const cv::Mat1b &src) {

    // 創建一個QImage, 寬:src.cols, 高src.rows, 格式:QImage::Format_ARGB32
    QImage dest(src.cols, src.rows, QImage::Format_ARGB32);

    // (1)垂直方向
    for (int y = 0; y < src.rows; ++y) {
        // 來源: 宣告一個Vec3b指標 cv::Vec3b *srcrow;

        const uchar *srcrow = src[y];
        // 目標: 宣告一個QRgb指標  QRgb *destrow
        QRgb *destrow = (QRgb*)dest.scanLine(y);

        // (2)水平方向
        for (int x = 0; x < src.cols; ++x) {

            destrow[x] = qRgba(srcrow[x], srcrow[x], srcrow[x], 255);
        }
    }
    return dest;
}

//------------------------------------------------------------------------------
QImage Mat2QImage(const cv::Mat_<double> &src)
{
        double scale = 255.0;
        QImage dest(src.cols, src.rows, QImage::Format_ARGB32);
        for (int y = 0; y < src.rows; ++y) {
                const double *srcrow = src[y];
                QRgb *destrow = (QRgb*)dest.scanLine(y);
                for (int x = 0; x < src.cols; ++x) {
                        unsigned int color = srcrow[x] * scale;
                        destrow[x] = qRgba(color, color, color, 255);
                }
        }
        return dest;
}
//------------------------------------------------------------------------------
void imshow(QLabel* const label, const QImage &qimg)          // 顯示影像
{
    label->move(0,0);
    // display on label
    label->setPixmap(QPixmap::fromImage(qimg));
    // resize the label to fit the image
    label->resize(label->pixmap()->size());
}

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執行測試

開啟一張彩色照片 Caraunt HM550.jpg

點選<彩色>頁面

點選<灰階>頁面




原始程式碼: RGB2GrayQt5OpenCV246