function?dss?=?diffss（ss）
%?DIFFSS??Difference?of?scale?space
%???DSS=DIFFSS（SS）?returns?a?scale?space?DSS?obtained?by?subtracting
%???consecutive?levels?of?the?scale?space?SS.
%
%???In?SIFT?this?function?is?used?to?compute?the?difference?of
%???Gaussian?scale?space?from?the?Gaussian?scale?space?of?an?image.
%
%???See?also?GAUSSIANSS（）?PDF:SIFT.USER.SS.

%?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?6711293?（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.

dss.smin?=?ss.smin?;
dss.smax?=?ss.smax-1?;
dss.omin?=?ss.omin?;
dss.O?=?ss.O?;
dss.S?=?ss.S?;
dss.sigma0?=?ss.sigma0?;

for?o=1:dss.O
??%?Can?be?done?at?once?but?it?turns?out?to?be?faster
??%?this?way
??[MNS]?=?size（ss.octave{o}）?;
??dss.octave{o}?=?zeros（MNS-1）?;
??for?s=1:S-1
????dss.octave{o}（::s）?=?...
????????ss.octave{o}（::s+1）?-?ss.octave{o}（::s）?;
??end
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2006-08-04?10:29??data\
?????文件??????464954??2006-04-05?04:45??data\img3.jpg
?????文件?????1420810??2006-04-05?04:45??data\img3.sift
?????文件??????467808??2006-04-05?04:45??data\img5.jpg
?????文件?????1585635??2006-04-05?04:45??data\img5.sift
?????文件??????275111??2006-05-01?19:51??data\landscape-a.jpg
?????文件??????304723??2006-05-01?19:51??data\landscape-b.jpg
?????文件????????7620??2006-04-05?04:45??data\test.png
?????文件???????34162??2006-04-05?04:45??data\test.sift
?????文件????????2797??2006-05-12?21:43??diffss.m
?????目錄???????????0??2006-08-04?12:59??doc\
?????文件?????????246??2006-04-11?07:37??doc\bibliography.bib
?????目錄???????????0??2006-04-27?23:03??doc\figures\
?????文件?????????550??2006-04-27?23:02??doc\figures\sift-descriptor-AI.bb
?????文件??????475918??2006-04-27?23:02??doc\figures\sift-descriptor-AI.pdf
?????文件????????3275??2006-04-27?23:00??doc\figures\sift-descriptor-SAVED.tex
?????文件???????????8??2006-04-27?23:03??doc\figures\sift-descriptor.aux
?????文件???????13430??2006-04-27?23:03??doc\figures\sift-descriptor.log
?????文件??????443880??2006-04-27?23:03??doc\figures\sift-descriptor.pdf
?????文件????????3275??2006-04-27?23:03??doc\figures\sift-descriptor.tex
?????文件??????????13??2006-04-27?23:03??doc\figures\sift-descriptor.wrm
?????文件???????48557??2001-07-05?02:24??doc\figures\warmread.sty
?????文件???????21807??2006-05-13?07:16??doc\sift.tex
?????文件????????6174??2006-04-11?07:39??doc\visionlab.sty
?????文件????????7920??2006-05-12?21:44??gaussianss.m
?????文件????????2359??2006-05-12?21:45??imreadbw.m
?????文件????????2994??2006-05-01?22:36??imsmooth.c
?????文件????????1990??2006-04-05?08:42??LICENSE
?????文件????????2117??2006-08-04?10:31??Makefile
?????文件????????2178??2006-05-01?22:36??mexutils.c
?????文件????????4360??2006-05-18?17:36??plotmatches.m
............此處省略24個文件信息