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diff --git a/SD-VBS/benchmarks/sift/src/matlab/plotss.m b/SD-VBS/benchmarks/sift/src/matlab/plotss.m
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+function plotss(ss,field)
+% PLOTSS  Plot scale space
+%   PLOTSS(SS) plots all octaves of the scale space SS.
+%
+%   See also GAUSSIANSS(), DIFFSS().
+
+% AUTORIGHTS
+% Copyright (c) 2006 The Regents of the University of California.
+% All Rights Reserved.
+% 
+% Created by Andrea Vedaldi
+% UCLA Vision Lab - Department of Computer Science
+% 
+% Permission to use, copy, modify, and distribute this software and its
+% documentation for educational, research and non-profit purposes,
+% without fee, and without a written agreement is hereby granted,
+% provided that the above copyright notice, this paragraph and the
+% following three paragraphs appear in all copies.
+% 
+% This software program and documentation are copyrighted by The Regents
+% of the University of California. The software program and
+% documentation are supplied "as is", without any accompanying services
+% from The Regents. The Regents does not warrant that the operation of
+% the program will be uninterrupted or error-free. The end-user
+% understands that the program was developed for research purposes and
+% is advised not to rely exclusively on the program for any reason.
+% 
+% This software embodies a method for which the following patent has
+% been issued: "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.
+% 
+% IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
+% FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
+% INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND
+% ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN
+% ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. THE UNIVERSITY OF
+% CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
+% LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+% A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
+% BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE
+% MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+
+if nargin > 2
+    error('Too many arguments.') ;
+end
+
+omin = ss.omin ;
+smin = ss.smin ;
+nlevels = ss.smax-ss.smin+1 ;
+
+for oi=1:ss.O
+        for si=1:nlevels
+                tightsubplot(nlevels, ss.O, nlevels*(oi-1)+si) ;
+                s = si-1 + smin ;
+                o = oi-1 + omin ;
+                sigma = ss.sigma0 * 2^(s/ss.S + o) ;
+                F=squeeze(ss.octave{oi}(:,:,si)) ;
+                [M,N]=size(F) ;
+                imagesc(squeeze(ss.octave{oi}(:,:,si))) ;       axis image ; axis off ;
+                h=text(M/10,N/20,sprintf('(o,s)=(%d,%d), sigma=%f',o,s,sigma)) ;
+                set(h,'BackgroundColor','w','Color','k') ;
+        end
+end
+
+