%%?This?function?extract?hog?features?of?all?face?images?under?the?path?‘path‘?with?extension?‘ext‘.
%?Return:?A?1-by-N?cell?with?containing?the?features?of?face?images?where?N
%?is?the?number?of?face?images.
function?feat?=?extract_hog_feat（pathext）
tic
fls?=?dir（[path?‘/‘?‘*.‘?ext]）;
feat?=?cell（1length（fls））;

if?isempty（fls）
????warning（‘No?image?file?was?found.‘）;
????toc
????return;
end

%?parameters.
szPatch?=?16;
sift_fac?=?0.5;
szImage?=?size（imread（[path?‘/‘?fls（1）.name?]））;

for?indImg?=?1:length（fls）
????I?=?imread（[path?‘/‘?fls（indImg）.name?]）;
????feat{indImg}?=?HOG（I4*szPatchsift_fac/4szImage）;
end
toc
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件???????10240??2014-07-18?17:38??hog\HOG.mexw64
?????文件?????????659??2014-07-18?17:38??hog\extract_hog_feat.m
?????目錄???????????0??2014-07-18?17:38??hog\