cvflann::lsh::LshTable< ElementType > Class Template Reference

#include <lsh_table.h>

Public Types
typedef std::map< BucketKey, Bucket >	BucketsSpace
typedef std::vector< Bucket >	BucketsSpeed

Public Member Functions
	LshTable ()
	LshTable (unsigned int feature_size, unsigned int key_size, std::vector< size_t > &indices)
void	add (unsigned int value, const ElementType *feature)
void	add (int indexed_ofst, Matrix< ElementType > dataset)
const Bucket *	getBucketFromKey (BucketKey key) const
size_t	getKey (const ElementType *) const
LshStats	getStats () const
template<>
	LshTable (unsigned int feature_size, unsigned int subsignature_size, std::vector< size_t > &indices)
template<>
size_t	getKey (const unsigned char *feature) const
template<>
LshStats	getStats () const

Detailed Description

template<typename ElementType>
class cvflann::lsh::LshTable< ElementType >

Lsh hash table. As its key is a sub-feature, and as usually the size of it is pretty small, we keep it as a continuous memory array. The value is an index in the corpus of features (we keep it as an unsigned int for pure memory reasons, it could be a size_t)

Member Typedef Documentation

template<typename ElementType>

typedef std::map<BucketKey, Bucket> cvflann::lsh::LshTable< ElementType >::BucketsSpace

A container of all the feature indices. Optimized for space

template<typename ElementType>

typedef std::vector<Bucket> cvflann::lsh::LshTable< ElementType >::BucketsSpeed

A container of all the feature indices. Optimized for speed

Constructor & Destructor Documentation

template<typename ElementType>

cvflann::lsh::LshTable< ElementType >::LshTable ( )

inline

Default constructor

template<typename ElementType>

cvflann::lsh::LshTable< ElementType >::LshTable ( unsigned int  feature_size, unsigned int  key_size, std::vector< size_t > &  indices  )

inline

Default constructor Create the mask and allocate the memory

Parameters

feature_size	is the size of the feature (considered as a ElementType[])
key_size	is the number of bits that are turned on in the feature
indices

template<>

cvflann::lsh::LshTable< unsigned char >::LshTable ( unsigned int  feature_size, unsigned int  subsignature_size, std::vector< size_t > &  indices  )

inline

Member Function Documentation

template<typename ElementType>

void cvflann::lsh::LshTable< ElementType >::add ( unsigned int  value, const ElementType *  feature  )

inline

Add a feature to the table

Parameters

value	the value to store for that feature
feature	the feature itself

template<typename ElementType>

void cvflann::lsh::LshTable< ElementType >::add ( int  indexed_ofst, Matrix< ElementType >  dataset  )

inline

Add a set of features to the table

Parameters

indexed_ofst	previous indexed offset
dataset	the values to store

template<typename ElementType>

const Bucket* cvflann::lsh::LshTable< ElementType >::getBucketFromKey ( BucketKey  key ) const

inline

Get a bucket given the key

Parameters

key

Returns

template<typename ElementType>

size_t cvflann::lsh::LshTable< ElementType >::getKey ( const ElementType *  ) const

inline

Compute the sub-signature of a feature

template<>

size_t cvflann::lsh::LshTable< unsigned char >::getKey ( const unsigned char *  feature ) const

inline

Return the Subsignature of a feature

Parameters

feature

the feature to analyze

template<typename ElementType>

LshStats cvflann::lsh::LshTable< ElementType >::getStats

(

)

const

Get statistics about the table

Returns

template<>

LshStats cvflann::lsh::LshTable< unsigned char >::getStats ( ) const

inline

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

• lsh_table.h