sampling.h
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28 
29 
30 #ifndef OPENCV_FLANN_SAMPLING_H_
31 #define OPENCV_FLANN_SAMPLING_H_
32 
33 #include "matrix.h"
34 #include "random.h"
35 
36 namespace cvflann
37 {
38 
39 template<typename T>
40 Matrix<T> random_sample(Matrix<T>& srcMatrix, long size, bool remove = false)
41 {
42  Matrix<T> newSet(new T[size * srcMatrix.cols], size,srcMatrix.cols);
43 
44  T* src,* dest;
45  for (long i=0; i<size; ++i) {
46  long r = rand_int((int)(srcMatrix.rows-i));
47  dest = newSet[i];
48  src = srcMatrix[r];
49  std::copy(src, src+srcMatrix.cols, dest);
50  if (remove) {
51  src = srcMatrix[srcMatrix.rows-i-1];
52  dest = srcMatrix[r];
53  std::copy(src, src+srcMatrix.cols, dest);
54  }
55  }
56  if (remove) {
57  srcMatrix.rows -= size;
58  }
59  return newSet;
60 }
61 
62 template<typename T>
63 Matrix<T> random_sample(const Matrix<T>& srcMatrix, size_t size)
64 {
65  UniqueRandom rand((int)srcMatrix.rows);
66  Matrix<T> newSet(new T[size * srcMatrix.cols], size,srcMatrix.cols);
67 
68  T* src,* dest;
69  for (size_t i=0; i<size; ++i) {
70  long r = rand.next();
71  dest = newSet[i];
72  src = srcMatrix[r];
73  std::copy(src, src+srcMatrix.cols, dest);
74  }
75  return newSet;
76 }
77 
78 } // namespace
79 
80 
81 #endif /* OPENCV_FLANN_SAMPLING_H_ */
GLdouble GLdouble GLdouble r
const void * src
Definition: core_c.h:1568
size_t cols
Definition: matrix.h:52
CV_EXPORTS void copy(const Mat &src, Mat &dst, const Mat &mask=Mat(), bool invertMask=false)
CvSize size
Definition: calib3d.hpp:212
CvRect r
Definition: core_c.h:1282
const CvMat const CvMat const CvMat CvMat CvMat CvMat CvMat CvSize CvMat CvMat * T
Definition: calib3d.hpp:270
Matrix< T > random_sample(Matrix< T > &srcMatrix, long size, bool remove=false)
Definition: sampling.h:40
Definition: matrix.h:46
Definition: random.h:81
int next()
Definition: random.h:120
size_t rows
Definition: matrix.h:51
int rand_int(int high=RAND_MAX, int low=0)
Definition: random.h:72
GLsizeiptr size
Definition: core_c.h:939