85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
|
/***********************************************************************
|
||
|
|
* Software License Agreement (BSD License)
|
||
|
|
*
|
||
|
|
* Copyright 2008-2009 Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
|
||
|
|
* Copyright 2008-2009 David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
*
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*************************************************************************/
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef OPENCV_FLANN_SAMPLING_H_
|
||
|
|
#define OPENCV_FLANN_SAMPLING_H_
|
||
|
|
|
||
|
|
//! @cond IGNORED
|
||
|
|
|
||
|
|
#include "matrix.h"
|
||
|
|
#include "random.h"
|
||
|
|
|
||
|
|
namespace cvflann
|
||
|
|
{
|
||
|
|
|
||
|
|
template<typename T>
|
||
|
|
Matrix<T> random_sample(Matrix<T>& srcMatrix, long size, bool remove = false)
|
||
|
|
{
|
||
|
|
Matrix<T> newSet(new T[size * srcMatrix.cols], size,srcMatrix.cols);
|
||
|
|
|
||
|
|
T* src,* dest;
|
||
|
|
for (long i=0; i<size; ++i) {
|
||
|
|
long r = rand_int((int)(srcMatrix.rows-i));
|
||
|
|
dest = newSet[i];
|
||
|
|
src = srcMatrix[r];
|
||
|
|
std::copy(src, src+srcMatrix.cols, dest);
|
||
|
|
if (remove) {
|
||
|
|
src = srcMatrix[srcMatrix.rows-i-1];
|
||
|
|
dest = srcMatrix[r];
|
||
|
|
std::copy(src, src+srcMatrix.cols, dest);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (remove) {
|
||
|
|
srcMatrix.rows -= size;
|
||
|
|
}
|
||
|
|
return newSet;
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename T>
|
||
|
|
Matrix<T> random_sample(const Matrix<T>& srcMatrix, size_t size)
|
||
|
|
{
|
||
|
|
UniqueRandom rand((int)srcMatrix.rows);
|
||
|
|
Matrix<T> newSet(new T[size * srcMatrix.cols], size,srcMatrix.cols);
|
||
|
|
|
||
|
|
T* src,* dest;
|
||
|
|
for (size_t i=0; i<size; ++i) {
|
||
|
|
long r = rand.next();
|
||
|
|
dest = newSet[i];
|
||
|
|
src = srcMatrix[r];
|
||
|
|
std::copy(src, src+srcMatrix.cols, dest);
|
||
|
|
}
|
||
|
|
return newSet;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace
|
||
|
|
|
||
|
|
//! @endcond
|
||
|
|
|
||
|
|
#endif /* OPENCV_FLANN_SAMPLING_H_ */
|