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linux操作系统下的sift算法

                 A LIGHTWEIGHT C++ IMPLEMENTATION OF
           DAVID LOWE'S SCALE INVARIANT FEATURE TRANSFORMS
                            Andrea Vedaldi
                   http://www.cs.ucla.edu/~vedaldi

WARNING

  This software is derived from a SIFT implementation which should be
  rather stable. However this particular version should still be
  considered a beta release as:

  * there are some new pieces of code (the command line driver,
    loading/saving PGM files, ...) which may contain bugs and

  * I didn't have time to test it throughfully.

COPYRIGHT WARNING

  This code implements an algorithm (SIFT) patended by David Lowe and
  cannot be used for commercial purposes without his permission. See
  the included license notice for more information.

CHANGES
  0.6.2  Minor bug fixes. Minor corrections to the man page.
  0.6.1  Removed a bug affecting the downsampling of oddly sized images.
  0.6.0  Introduced --stable-order option.
  0.5.6  Fixed a minor bug in the convolution code. Increased the default
         number of octaves that get computed.
  0.5.5  More bug fixes (PGM parsing error)
  0.5.4  New switch VL_LOWE_STRICT. This enables features that simulate
         even more closely Lowe's implementation (it does even
         simulate a small 'bug').
  0.5.3  Bug fixes (thanks to P. Ivanov).
  0.5.2  Man page.
  0.5.1  Changed the way image boundaries are handled in the computation
         of the scalespace (thanks to Q.S.Luo for indicating the
         problem). This makes the algorithm even closer to
         Lowe's. Inital version of the manpage.
  0.5    Optionally reads keypoint frames from file. Improved interface.
  0.4    Faster (and approximated) computations. Binary descriptor output.
  0.3    Added `--threshold' and `--edge-threshold' opitons to the
         command line driver.
  0.2.2  Corrected a bug in the resolution of the 3x3 linear system.
         (thanks to Fan Gu for finding this out)
  0.2.1  Corrected a bug in the command line driver.
  0.2    Made LAPACK independent.
  0.1    Initial version.