﻿Implementation of SIFT is based on the code from
http://blogs.oregonstate.edu/hess/code/sift/ Below is the original copyright.

Copyright (c) 2006-2010, Rob Hess <hess@eecs.oregonstate.edu>
All rights reserved.

The following patent has been issued for methods embodied in this software:
"Method and apparatus for identifying scale invariant features in an image and
use of same for locating an object in an image," David G. Lowe, US Patent
6,711,293 (March 23, 2004). Provisional application filed March 8, 1999.
Asignee: The University of British Columbia. For further details, contact David
Lowe (lowe@cs.ubc.ca) or the University-Industry Liaison Office of the
University of British Columbia.

Note that restrictions imposed by this patent (and possibly others) exist
independently of and may be in conflict with the freedoms granted in this
license, which refers to copyright of the program, not patents for any methods
that it implements.  Both copyright and patent law must be obeyed to legally use
and redistribute this program and it is not the purpose of this license to
induce you to infringe any patents or other property right claims or to contest
validity of any such claims.  If you redistribute or use the program, then this
license merely protects you from committing copyright infringement.  It does not
protect you from committing patent infringement.  So, before you do anything
with this program, make sure that you have permission to do so not merely in
terms of copyright, but also in terms of patent law.

Please note that this license is not to be understood as a guarantee either.  If
you use the program according to this license, but in conflict with patent law,
it does not mean that the licensor will refund you for any losses that you incur
if you are sued for your patent infringement.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright and patent
  notices, this list of conditions and the following disclaimer.

* 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.

* Neither the name of Oregon State University nor the names of its contributors
  may be used to endorse or promote products derived from this software without
  specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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