rtflann::HammingLUT Struct Reference

#include <dist.h>

Public Types
typedef unsigned char	ElementType
typedef int	ResultType

Public Member Functions
ResultType	operator() (const unsigned char *a, const unsigned char *b, int size) const

Static Public Member Functions
static unsigned char	byteBitsLookUp (unsigned char b)
	given a byte, count the bits using a look up table More...

Detailed Description

Hamming distance functor - counts the bit differences between two strings - useful for the Brief descriptor bit count of A exclusive XOR'ed with B

Definition at line 400 of file dist.h.

Member Typedef Documentation

ElementType

typedef unsigned char rtflann::HammingLUT::ElementType

Definition at line 402 of file dist.h.

ResultType

typedef int rtflann::HammingLUT::ResultType

Definition at line 403 of file dist.h.

Member Function Documentation

byteBitsLookUp()

static unsigned char rtflann::HammingLUT::byteBitsLookUp ( unsigned char  b )

inlinestatic

given a byte, count the bits using a look up table

Parameters

b	the byte to count bits. The look up table has an entry for all values of b, where that entry is the number of bits.

Returns

the number of bits in byte b

Definition at line 422 of file dist.h.

operator()()

ResultType rtflann::HammingLUT::operator() ( const unsigned char *  a, const unsigned char *  b, int  size  ) const

inline

this will count the bits in a ^ b

Definition at line 407 of file dist.h.

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

• dist.h