cv::BOWTrainer Class Reference

Abstract base class for training the bag of visual words vocabulary from a set of descriptors. More...

#include <opencv2/features2d.hpp>

Inheritance diagram for cv::BOWTrainer:

Public Member Functions
	BOWTrainer ()
virtual	~BOWTrainer ()
void	add (const Mat &descriptors)
	Adds descriptors to a training set.
virtual void	clear ()
virtual Mat	cluster () const =0
virtual Mat	cluster (const Mat &descriptors) const =0
	Clusters train descriptors.
int	descriptorsCount () const
	Returns the count of all descriptors stored in the training set.
const std::vector< Mat > &	getDescriptors () const
	Returns a training set of descriptors.

Protected Attributes
std::vector< Mat >	descriptors
int	size

Detailed Description

Abstract base class for training the bag of visual words vocabulary from a set of descriptors.

For details, see, for example, Visual Categorization with Bags of Keypoints by Gabriella Csurka, Christopher R. Dance, Lixin Fan, Jutta Willamowski, Cedric Bray, 2004. :

Constructor & Destructor Documentation

cv::BOWTrainer::BOWTrainer

(

)

virtual cv::BOWTrainer::~BOWTrainer ( )

virtual

Member Function Documentation

void cv::BOWTrainer::add

(

const Mat &

descriptors

)

Adds descriptors to a training set.

Parameters

descriptors

Descriptors to add to a training set. Each row of the descriptors matrix is a descriptor.

The training set is clustered using clustermethod to construct the vocabulary.

virtual void cv::BOWTrainer::clear ( )

virtual

virtual Mat cv::BOWTrainer::cluster ( ) const

pure virtual

Python:
	retval	=	cv.BOWTrainer.cluster(		)
	retval	=	cv.BOWTrainer.cluster(	descriptors	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Implemented in cv::BOWKMeansTrainer.

virtual Mat cv::BOWTrainer::cluster ( const Mat &  descriptors ) const

pure virtual

Python:
	retval	=	cv.BOWTrainer.cluster(		)
	retval	=	cv.BOWTrainer.cluster(	descriptors	)

Clusters train descriptors.

Parameters

descriptors

Descriptors to cluster. Each row of the descriptors matrix is a descriptor. Descriptors are not added to the inner train descriptor set.

The vocabulary consists of cluster centers. So, this method returns the vocabulary. In the first variant of the method, train descriptors stored in the object are clustered. In the second variant, input descriptors are clustered.

Implemented in cv::BOWKMeansTrainer.

int cv::BOWTrainer::descriptorsCount

(

)

const

Returns the count of all descriptors stored in the training set.

const std::vector<Mat>& cv::BOWTrainer::getDescriptors

(

)

const

Returns a training set of descriptors.

Member Data Documentation

std::vector<Mat> cv::BOWTrainer::descriptors

protected

int cv::BOWTrainer::size

protected

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The documentation for this class was generated from the following file:

• features2d.hpp