Common Interfaces of Descriptor Extractors ========================================== .. highlight:: cpp Extractors of keypoint descriptors in OpenCV have wrappers with a common interface that enables you to easily switch between different algorithms solving the same problem. This section is devoted to computing descriptors represented as vectors in a multidimensional space. All objects that implement the ``vector`` descriptor extractors inherit the :ocv:class:`DescriptorExtractor` interface. CalonderDescriptorExtractor --------------------------- .. ocv:class:: CalonderDescriptorExtractor : public DescriptorExtractor Wrapping class for computing descriptors by using the :ocv:class:`RTreeClassifier` class. :: template class CalonderDescriptorExtractor : public DescriptorExtractor { public: CalonderDescriptorExtractor( const string& classifierFile ); virtual void read( const FileNode &fn ); virtual void write( FileStorage &fs ) const; virtual int descriptorSize() const; virtual int descriptorType() const; protected: ... }