Mat转换为QImage

QImage Mat2QImage(const Mat& mat)

{

    // 8-bits unsigned, NO. OF CHANNELS=1

    if(mat.type()==CV_8UC1)

    {

        cout<<"1"< 
  
        // Set the color table (used to translate colour indexes to qRgb values)
 
  
        QVector<QRgb> colorTable;
 
  
        for (int i=0; i<256; i++)
 
  
            colorTable.push_back(qRgb(i,i,i));
 
  
        // Copy input Mat
 
  
        const uchar *qImageBuffer = (const uchar*)mat.data;
 
  
        // Create QImage with same dimensions as input Mat
 
  
        QImage img(qImageBuffer, mat.cols, mat.rows, mat.step, QImage::Format_Indexed8);
 
  
        img.setColorTable(colorTable);
 
  
        return img;
 
  
    }
 
  
    // 8-bits unsigned, NO. OF CHANNELS=3
 
  
    if(mat.type()==CV_8UC3)
 
  
    {
 
  
        cout<<"3"< 
  
        // Copy input Mat
 
  
        const uchar *qImageBuffer = (const uchar*)mat.data;
 
  
        // Create QImage with same dimensions as input Mat
 
  
        QImage img(qImageBuffer, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);
 
  
        return img.rgbSwapped();
 
  
 
  
    }
 
  
    else
 
  
    {
 
  
        qDebug() << "ERROR: Mat could not be converted to QImage.";
 
  
        return QImage();
 
  
    }
 
  
}