Diff: include/opencv2/flann/sampling.h

Revision:

0:0e0631af0305

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/opencv2/flann/sampling.h	Fri Jan 29 04:53:38 2021 +0000
@@ -0,0 +1,81 @@
+/***********************************************************************
+ * 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_ */