sampling.h
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/***********************************************************************
* 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_
#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
#endif /* OPENCV_FLANN_SAMPLING_H_ */