C++ (Cpp) ImageDecoder Examples

Example #1

File: loadsave.cpp Project: DenisBMSTU/install_opencv

static ImageDecoder findDecoder( const Mat& buf )
{
    size_t i, maxlen = 0;

    if( buf.rows*buf.cols < 1 || !buf.isContinuous() )
        return ImageDecoder();

    for( i = 0; i < codecs.decoders.size(); i++ )
    {
        size_t len = codecs.decoders[i]->signatureLength();
        maxlen = std::max(maxlen, len);
    }

    string signature(maxlen, ' ');
    size_t bufSize = buf.rows*buf.cols*buf.elemSize();
    maxlen = std::min(maxlen, bufSize);
    memcpy( &signature[0], buf.data, maxlen );

    for( i = 0; i < codecs.decoders.size(); i++ )
    {
        if( codecs.decoders[i]->checkSignature(signature) )
            return codecs.decoders[i]->newDecoder();
    }

    return ImageDecoder();
}

Example #2

File: loadsave.cpp Project: DenisBMSTU/install_opencv

static ImageDecoder findDecoder( const string& filename )
{
    size_t i, maxlen = 0;
    for( i = 0; i < codecs.decoders.size(); i++ )
    {
        size_t len = codecs.decoders[i]->signatureLength();
        maxlen = std::max(maxlen, len);
    }

    FILE* f= fopen( filename.c_str(), "rb" );
    if( !f )
        return ImageDecoder();
    string signature(maxlen, ' ');
    maxlen = fread( &signature[0], 1, maxlen, f );
    fclose(f);
    signature = signature.substr(0, maxlen);

    for( i = 0; i < codecs.decoders.size(); i++ )
    {
        if( codecs.decoders[i]->checkSignature(signature) )
            return codecs.decoders[i]->newDecoder();
    }

    return ImageDecoder();
}

Example #3

File: loadsave.cpp Project: rahulremanan/opencv

/**
 * Find the decoders
 *
 * @param[in] filename File to search
 *
 * @return Image decoder to parse image file.
*/
static ImageDecoder findDecoder( const String& filename ) {

    size_t i, maxlen = 0;

    /// iterate through list of registered codecs
    for( i = 0; i < codecs.decoders.size(); i++ )
    {
        size_t len = codecs.decoders[i]->signatureLength();
        maxlen = std::max(maxlen, len);
    }

    /// Open the file
    FILE* f= fopen( filename.c_str(), "rb" );

    /// in the event of a failure, return an empty image decoder
    if( !f )
        return ImageDecoder();

    // read the file signature
    String signature(maxlen, ' ');
    maxlen = fread( (void*)signature.c_str(), 1, maxlen, f );
    fclose(f);
    signature = signature.substr(0, maxlen);

    /// compare signature against all decoders
    for( i = 0; i < codecs.decoders.size(); i++ )
    {
        if( codecs.decoders[i]->checkSignature(signature) )
            return codecs.decoders[i]->newDecoder();
    }

    /// If no decoder was found, return base type
    return ImageDecoder();
}

Example #4

File: loadsave.cpp Project: glo/ee384b

ImageDecoder findDecoder( const Vector<uchar>& buf )
{
    size_t i, maxlen = 0;

    if( buf.size() < 1 )
        return ImageDecoder();

    for( i = 0; i < decoders.size(); i++ )
    {
        size_t len = decoders[i]->signatureLength();
        maxlen = std::max(maxlen, len);
    }

    maxlen = std::min(maxlen, buf.size());
    String signature(maxlen, ' ');
    memcpy( &signature[0], &buf[0], maxlen );

    for( i = 0; i < decoders.size(); i++ )
    {
        if( decoders[i]->checkSignature(signature) )
            return decoders[i]->newDecoder();
    }

    return ImageDecoder();
}

Example #5

File: grfmt_base.cpp Project: Belial2010/Face-Expression-Recognition

ImageDecoder BaseImageDecoder::newDecoder() const
{
    return ImageDecoder();
}