QImage与cv::Mat相互转换

单纯的转换而已，不赘述

头文件mat2qimg.h

#ifndef MAT2QIMG_H
#define MAT2QIMG_H

#include <QImage>

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/opencv.hpp>

class QImage;

class mat2qimg
{
    
    
public:

    mat2qimg();
    QImage cvMat2QImage(const cv::Mat& mat);
    cv::Mat QImage2cvMat(QImage image);

};

#endif // MAT2QIMG_H

实现 mat2qimg.cpp

#include "mat2qimg.h"

mat2qimg::mat2qimg()
{
    
    

}

QImage mat2qimg::cvMat2QImage(const cv::Mat& mat)
{
    
    
    if(mat.type() == CV_8UC1)
    {
    
    
        QImage image(mat.cols, mat.rows, QImage::Format_Indexed8);
        image.setColorCount(256);
        for(int i = 0; i < 256; i++)
        {
    
    
            image.setColor(i, qRgb(i, i, i));
        }
        uchar *pSrc = mat.data;
        for(int row = 0; row < mat.rows; row ++)
        {
    
    
            uchar *pDest = image.scanLine(row);
            memcpy(pDest, pSrc, mat.cols);
            pSrc += mat.step;
        }
        return image;
    }
    else if(mat.type() == CV_8UC3)
    {
    
    
        const uchar *pSrc = (const uchar*)mat.data;
        QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);
        return image.rgbSwapped();
    }
    else if(mat.type() == CV_8UC4)
    {
    
    
        const uchar *pSrc = (const uchar*)mat.data;
        QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_ARGB32);
        return image.copy();
    }
    else
    {
    
    
        return QImage();
    }
}

cv::Mat mat2qimg::QImage2cvMat(QImage image)
{
    
    
    cv::Mat mat;
    switch(image.format())
    {
    
    
    case QImage::Format_ARGB32:
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32_Premultiplied:
        mat = cv::Mat(image.height(), image.width(), CV_8UC4, (void*)image.constBits(), image.bytesPerLine());
        break;
    case QImage::Format_RGB888:
        mat = cv::Mat(image.height(), image.width(), CV_8UC3, (void*)image.constBits(), image.bytesPerLine());
        cv::cvtColor(mat, mat, CV_BGR2RGB);
        break;
    case QImage::Format_Indexed8:
        mat = cv::Mat(image.height(), image.width(), CV_8UC1, (void*)image.constBits(), image.bytesPerLine());
        break;
    }
    return mat;
}