ground_truth.h
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30 
31 #ifndef OPENCV_FLANN_GROUND_TRUTH_H_
32 #define OPENCV_FLANN_GROUND_TRUTH_H_
33 
34 #include "dist.h"
35 #include "matrix.h"
36 
37 
38 namespace cvflann
39 {
40 
41 template <typename Distance>
42 void find_nearest(const Matrix<typename Distance::ElementType>& dataset, typename Distance::ElementType* query, int* matches, int nn,
43  int skip = 0, Distance distance = Distance())
44 {
45  typedef typename Distance::ResultType DistanceType;
46  int n = nn + skip;
47 
48  std::vector<int> match(n);
49  std::vector<DistanceType> dists(n);
50 
51  dists[0] = distance(dataset[0], query, dataset.cols);
52  match[0] = 0;
53  int dcnt = 1;
54 
55  for (size_t i=1; i<dataset.rows; ++i) {
56  DistanceType tmp = distance(dataset[i], query, dataset.cols);
57 
58  if (dcnt<n) {
59  match[dcnt] = (int)i;
60  dists[dcnt++] = tmp;
61  }
62  else if (tmp < dists[dcnt-1]) {
63  dists[dcnt-1] = tmp;
64  match[dcnt-1] = (int)i;
65  }
66 
67  int j = dcnt-1;
68  // bubble up
69  while (j>=1 && dists[j]<dists[j-1]) {
70  std::swap(dists[j],dists[j-1]);
71  std::swap(match[j],match[j-1]);
72  j--;
73  }
74  }
75 
76  for (int i=0; i<nn; ++i) {
77  matches[i] = match[i+skip];
78  }
79 }
80 
81 
82 template <typename Distance>
84  int skip=0, Distance d = Distance())
85 {
86  for (size_t i=0; i<testset.rows; ++i) {
87  find_nearest<Distance>(dataset, testset[i], matches[i], (int)matches.cols, skip, d);
88  }
89 }
90 
91 
92 }
93 
94 #endif //OPENCV_FLANN_GROUND_TRUTH_H_
void compute_ground_truth(const Matrix< typename Distance::ElementType > &dataset, const Matrix< typename Distance::ElementType > &testset, Matrix< int > &matches, int skip=0, Distance d=Distance())
Definition: ground_truth.h:83
void find_nearest(const Matrix< typename Distance::ElementType > &dataset, typename Distance::ElementType *query, int *matches, int nn, int skip=0, Distance distance=Distance())
Definition: ground_truth.h:42
size_t cols
Definition: matrix.h:52
int d
Definition: legacy.hpp:3064
Definition: matrix.h:46
GLenum GLsizei n
size_t rows
Definition: matrix.h:51
::max::max int
Definition: functional.hpp:324
CV_EXPORTS void swap(Mat &a, Mat &b)
swaps two matrices