function?largeIm?=?Expand（im）;
%EXPAND?Compute?large?layer?of?Gaussian?pyramid

%?Sohaib?Khan?Feb?16?2000

%Algo
%Gaussian?mask?=?[0.05?0.25?0.4?0.25?0.05]?
%?Insert?zeros?in?every?alternate?row?position?and?conv?with?mask
%?insert?zeros?in?every?alternate?clmn?position?in?result?and?conv?with?mask‘

mask?=?2*[0.05?0.25?0.4?0.25?0.05];?%factor?of?2?is?there?because?each?pixel?gets?contribution?
												%?either?from?0.05?0.4?0.05??or?from?0.25?0.25

%?insert?zeros?in?every?alternate?position?in?each?row
rowZeros?=?[im;?zeros（size（im））];
rowZeros?=?reshape（rowZeros?size（im1）?2*size（im2））;

%conv?with?horiz?mask
newIm?=?conv2（rowZeros?mask）;
newIm?=?newIm（:3:size（newIm2）-2）;

%?insert?zeros?in?every?alternate?position?in?each?col
colZeros?=?newIm‘;
colZeros?=?[colZeros;?zeros

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????????582??2000-02-29?14:46??Reduce.m
?????文件??????????81??2004-09-14?02:36??Readme.txt
?????文件?????????983??2000-02-29?14:46??Expand.m
?????文件????????3373??2003-07-28?00:02??HierarchicalLK.m
?????文件????????1823??2003-10-23?01:47??LucasKanade.m
?????文件????????2850??2003-07-27?20:09??LucasKanadeRefined.m