OpenCV: cvflann::L2< T > Struct Template Reference

| OpenCV 3.4.2 Open Source Computer Vision

Public Types | Public Member Functions | List of all members
cvflann::L2< T > Struct Template Reference

`#include "dist.h"`

## Public Types
typedef T | ElementType
typedef True | is_kdtree_distance
typedef True | is_vector_space_distance
typedef Accumulator< T >::Type | ResultType

## Public Member Functions
template<typename U , typename V >
ResultType | accum_dist (const U &a, const V &b, int) const
template<typename Iterator1 , typename Iterator2 >
ResultType | operator() (Iterator1 a, Iterator2 b, size_t size, ResultType worst_dist=-1) const

## Detailed Description

### template<class T>
struct cvflann::L2< T >

Squared Euclidean distance functor, optimized version

## Member Typedef Documentation

## ◆ ElementType

template<class T >

typedef T cvflann::L2< T >::ElementType

## ◆ is_kdtree_distance

template<class T >

typedef True cvflann::L2< T >::is_kdtree_distance

## ◆ is_vector_space_distance

template<class T >

typedef True cvflann::L2< T >::is_vector_space_distance

## ◆ ResultType

template<class T >

typedef Accumulator<T>::Type cvflann::L2< T >::ResultType

## Member Function Documentation

## ◆ accum_dist()

template<class T >
template<typename U , typename V >

ResultType cvflann::L2< T >::accum_dist | ( | const U & | a,
|  | const V & | b,
|  | int |
| ) |  | const
| inline

Partial euclidean distance, using just one dimension. This is used by the kd-tree when computing partial distances while traversing the tree.

Squared root is omitted for efficiency.

## ◆ operator()()

template<class T >
template<typename Iterator1 , typename Iterator2 >

ResultType cvflann::L2< T >::operator() | ( | Iterator1 | a,
|  | Iterator2 | b,
|  | size_t | size,
|  | ResultType | worst_dist = `-1`
| ) |  | const
| inline

Compute the squared Euclidean distance between two vectors.

This is highly optimised, with loop unrolling, as it is one of the most expensive inner loops.

The computation of squared root at the end is omitted for efficiency.

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

- flann/include/opencv2/flann/dist.h