qt中QImageQImage和Mat类型的转换

将opencv中的Mat类型转换为qt中的QImage

QImage Mat2QImage(const Mat &mat)

{

    //8-bitsunsigned,NO.OFCHANNELS=1

    if(mat.type()==CV_8UC1)

    {

       //cout<<"1"<<endl;

        //Setthecolortable(usedtotranslatecolourindexestoqRgbvalues)

        QVector<QRgb>colorTable;

        for(int i=0;i<256;i++)

            colorTable.push_back(qRgb(i,i,i));

        //CopyinputMat

        const uchar*qImageBuffer=(const uchar*)mat.data;

        //CreateQImagewithsamedimensionsasinputMat

        QImage img(qImageBuffer,mat.cols,mat.rows,mat.step,QImage::Format_Indexed8);

        img.setColorTable(colorTable);

        return img;

    }

    //8-bitsunsigned,NO.OFCHANNELS=3

    if(mat.type()==CV_8UC3)

    {

       //cout<<"3"<<endl;

        //CopyinputMat

        const uchar*qImageBuffer=(const uchar*)mat.data;

        //CreateQImagewithsamedimensionsasinputMat

        QImage img(qImageBuffer,mat.cols,mat.rows,mat.step,QImage::Format_RGB888);

        return  img.rgbSwapped();

    }

    else

    {

        qDebug()<<"ERROR:MatcouldnotbeconvertedtoQImage.";

        return QImage();

    }

}

调用方式为

 Mat fileSrc = imread( path);

 QImage imagesrc = Mat2QImage(fileSrc);