C++ (Cpp) ImageEncoder::write Exemples

Exemple #1

Fichier : loadsave.cpp Projet : rahulremanan/opencv

bool imencode( const String& ext, InputArray _image,
               std::vector<uchar>& buf, const std::vector<int>& params )
{
    CV_TRACE_FUNCTION();

    Mat image = _image.getMat();

    int channels = image.channels();
    CV_Assert( channels == 1 || channels == 3 || channels == 4 );

    ImageEncoder encoder = findEncoder( ext );
    if( !encoder )
        CV_Error( CV_StsError, "could not find encoder for the specified extension" );

    if( !encoder->isFormatSupported(image.depth()) )
    {
        CV_Assert( encoder->isFormatSupported(CV_8U) );
        Mat temp;
        image.convertTo(temp, CV_8U);
        image = temp;
    }

    bool code;
    if( encoder->setDestination(buf) )
    {
        code = encoder->write(image, params);
        encoder->throwOnEror();
        CV_Assert( code );
    }
    else
    {
        String filename = tempfile();
        code = encoder->setDestination(filename);
        CV_Assert( code );

        code = encoder->write(image, params);
        encoder->throwOnEror();
        CV_Assert( code );

        FILE* f = fopen( filename.c_str(), "rb" );
        CV_Assert(f != 0);
        fseek( f, 0, SEEK_END );
        long pos = ftell(f);
        buf.resize((size_t)pos);
        fseek( f, 0, SEEK_SET );
        buf.resize(fread( &buf[0], 1, buf.size(), f ));
        fclose(f);
        remove(filename.c_str());
    }
    return code;
}

Exemple #2

bool imencode( const string& ext, const Mat& image,
               vector<uchar>& buf, const vector<int>& params )
{
    Mat temp;
    const Mat* pimage = &image;

    int channels = image.channels();
    CV_Assert( channels == 1 || channels == 3 || channels == 4 );

    ImageEncoder encoder = findEncoder( ext );
    if( encoder.empty() )
        CV_Error( CV_StsError, "could not find encoder for the specified extension" );

    if( !encoder->isFormatSupported(image.depth()) )
    {
        CV_Assert( encoder->isFormatSupported(CV_8U) );
        image.convertTo(temp, CV_8U);
        pimage = &temp;
    }

    bool code;
    if( encoder->setDestination(buf) )
    {
        code = encoder->write(image, params);
        CV_Assert( code );
    }
    else
    {
        char fnamebuf[L_tmpnam];
        const char* filename = tmpnam(fnamebuf);
        if(filename[0] == '\\')
            filename++;
        code = encoder->setDestination(filename);
        CV_Assert( code );
        code = encoder->write(image, params);
        CV_Assert( code );
        FILE* f = fopen( filename, "rb" );
        CV_Assert(f != 0);
        fseek( f, 0, SEEK_END );
        long pos = ftell(f);
        buf.resize((size_t)pos);
        fseek( f, 0, SEEK_SET );
        buf.resize(fread( &buf[0], 1, buf.size(), f ));
        fclose(f);
        remove(filename);
    }
    return code;
}

Exemple #3

Fichier : loadsave.cpp Projet : DenisBMSTU/install_opencv

static bool imwrite_( const string& filename, const Mat& image,
                      const vector<int>& params, bool flipv )
{
    Mat temp;
    const Mat* pimage = &image;

    CV_Assert( image.channels() == 1 || image.channels() == 3 || image.channels() == 4 );

    ImageEncoder encoder = findEncoder( filename );
    if( encoder.empty() )
        CV_Error( CV_StsError, "could not find a writer for the specified extension" );

    if( !encoder->isFormatSupported(image.depth()) )
    {
        CV_Assert( encoder->isFormatSupported(CV_8U) );
        image.convertTo( temp, CV_8U );
        pimage = &temp;
    }

    if( flipv )
    {
        flip(*pimage, temp, 0);
        pimage = &temp;
    }

    encoder->setDestination( filename );
    bool code = encoder->write( *pimage, params );

    //    CV_Assert( code );
    return code;
}