function?W?=?CompW（data?sigS?sigR?radius）
%?COMPW?????compute?weight?matrix
%?
%?sigS??????spatial?sigma
%?sigR??????range?sigma
%?radius????radius?for?truncated?Gaussian?kernel
%?
%?W?????????weitht?matrix
%?
%?By?Jiarui?Ding?U?of?S
%?Nov?14?2007

%?Data?preparing?3D（color）?or?1D（grayscale）?plus?2D?spacial?feature
[mRows?nCols?d]?=?size（data）;

%?
if?d==3
????cform?=?makecform（‘srgb2lab‘）;
????ILab??=?applycform（data?cform）;
????data??=?single（ILab）;
end
data?=?single（data）;

d?=?d+2;
[gridR?gridC]?=?ndgrid（?1:mRows?1:nCols?）;

%?Normalize?spacial?and?range?kernel?size?to?1
spaGrid?=?cat（?3?gridR/sigS?gridC/sigS）;?
data?=?cat（?3?spaGrid?data/sigR?）;

N?=?mRows?*?nCols;
W?=?sparse（NN）;

%?Improvement?exchange?the?order?of?the?two?for?loops?to?in?accordance?with
%?the?way?Matlab?indexing?matrix
for?i=1:mRows?
	for?j=1:nCols
????????newMean?=?data（ij:）;?
????????newMean?=?newMean（:）‘;
??????
????????%?Find?data?within?the?kernel?window
????????r?=?round（?newMean（1）*sigS?）;??
????????c?=?round（?newMean（2）*sigS?）;
????????????
????????%?Restrict?the?coordiates?in?the?domain?of?image?grid
????????rBound?=?max（1r-radius）:min（mRowsr+radius）;?
????????cBound?=?max（1c-radius）:min（nColsc+radius）;
????????
????????%?The?Row?and?Column?index
????????[rC?cC]?=?meshgrid（rBound?cBound）;
????????idxC?=?sub2ind（[mRows?nCols]?rC?cC）;
????????idxC?=?reshape（idxC‘?length（rBound）?*?length（cBound）?1）;
????????idxR?=?i?+?（j?-?1）?*?mRows;
????????
????????kernelWindow?=?data（?rBound?cBound?:?）;
????????kernelWindow?=?reshape（?kernelWindow?[]?d?）;?%?Get?a?d?dimential?vector?

????????%?Compute?weight??
????????n?=?size（?kernelWindow?1）;
????????D?=?sum（?（repmat（newMean?n?1）?-?kernelWindow?）.^2?2?）;????????
????????value?=?exp（-D）;

????????%?Get?weight?matrix
????????W（idxR?idxC）?=?value;????
????end
end

end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1926??2007-12-03?17:40??Ncut\CompW.m

?????文件????????506??2007-11-17?21:49??Ncut\Ncut.m

?????文件???????1134??2007-12-03?17:40??Ncut\NcutSeg.m

?????文件???????1946??2007-12-03?17:40??Ncut\Segment.m

?????目錄??????????0??2011-04-21?22:13??Ncut

-----------?---------??----------?-----??----

?????????????????5512????????????????????5