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94 lines
3.0 KiB
94 lines
3.0 KiB
/*********************************************************************** |
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* Software License Agreement (BSD License) |
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* |
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* Copyright 2008-2009 Marius Muja (mariusm@cs.ubc.ca). All rights reserved. |
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* Copyright 2008-2009 David G. Lowe (lowe@cs.ubc.ca). All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*************************************************************************/ |
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#ifndef _OPENCV_SAMPLING_H_ |
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#define _OPENCV_SAMPLING_H_ |
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#include "opencv2/flann/matrix.h" |
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#include "opencv2/flann/random.h" |
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namespace cvflann |
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{ |
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template<typename T> |
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Matrix<T> random_sample(Matrix<T>& srcMatrix, long size, bool remove = false) |
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{ |
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UniqueRandom rand((int)srcMatrix.rows); |
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Matrix<T> newSet(new T[size * srcMatrix.cols], size, (long)srcMatrix.cols); |
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T *src,*dest; |
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for (long i=0;i<size;++i) { |
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long r = rand.next(); |
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dest = newSet[i]; |
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src = srcMatrix[r]; |
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for (size_t j=0;j<srcMatrix.cols;++j) { |
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dest[j] = src[j]; |
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} |
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if (remove) { |
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dest = srcMatrix[srcMatrix.rows-i-1]; |
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src = srcMatrix[r]; |
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for (size_t j=0;j<srcMatrix.cols;++j) { |
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swap(*src,*dest); |
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src++; |
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dest++; |
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} |
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} |
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} |
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if (remove) { |
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srcMatrix.rows -= size; |
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} |
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return newSet; |
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} |
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template<typename T> |
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Matrix<T> random_sample(const Matrix<T>& srcMatrix, size_t size) |
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{ |
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UniqueRandom rand((int)srcMatrix.rows); |
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Matrix<T> newSet(new T[size * srcMatrix.cols], (long)size, (long)srcMatrix.cols); |
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T *src,*dest; |
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for (size_t i=0;i<size;++i) { |
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long r = rand.next(); |
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dest = newSet[i]; |
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src = srcMatrix[r]; |
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for (size_t j=0;j<srcMatrix.cols;++j) { |
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dest[j] = src[j]; |
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} |
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} |
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return newSet; |
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} |
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} // namespace cvflann |
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#endif /* _OPENCV_SAMPLING_H_ */
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