function?[feat_index]?=?addOriFeatures（ddata_indexfeat_indexddatahistnori_peak_ratio）
%?為關(guān)鍵點(diǎn)添加方向
global?features;
global?init_sigma;
global?intvls;
omax?=?dominantOri（histn）;
for?i?=?1:n
????if?（i==1）
????????????l?=?n;
????????????r?=?2;
????elseif?（i==n）
????????l?=?n-1;
????????r?=?1;
????else
????????l?=?i-1;
????????r?=?i+1;
????end
????if?（?hist（i）?>?hist（l）?&&?hist（i）?>?hist（r）?&&?hist（i）?>=?ori_peak_ratio*omax?）
????????bin?=?i?+?interp_hist_peak（hist（l）hist（i）hist（r））;
????????if?（?bin?-1?<=?0?）
????????????bin?=?bin?+?n;
????????%?i?think?it‘s?theoretically?impossible
????????elseif?（?bin?-1?>?n?）
????????????bin?=?bin?-?n;
????????????disp（‘###################what?the?fuck?###################‘）;
????????end
????????accu_intvl?=?ddata.intvl?+?ddata.x_hat（3）;
????????features（feat_index）.ddata_index?=?ddata_index;
????????%?第一個(gè)八度是雙倍大小
????????features（feat_index）.x?=?（ddata.x?+?ddata.x_hat（1））*2^（ddata.octv-2）;
????????features（feat_index）.y?=?（ddata.y?+?ddata.x_hat（2））*2^（ddata.octv-2）;
????????features（feat_index）.scl?=?init_sigma?*?power（2ddata.octv-2?+?（accu_intvl-1）/intvls）;????????
????????features（feat_index）.ori?=?（bin-1）/n*2*pi?-?pi;
????????feat_index?=?feat_index?+?1;
????end
end
end

function?[omax]?=?dominantOri（histn）
????omax?=?hist（1）;
????for?i?=?2:n
????????if（hist（i）?>?omax）
????????????omax?=?hist（i）;
????????end
????end
end

function?[position]?=?interp_hist_peak（lcr）
????position?=?0.5*（l-r）/（l-2*c+r）;
end

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件????????1539??2018-05-07?15:47??sift（matlab）\addOriFeatures.m
?????文件???????97697??2016-09-28?17:52??sift（matlab）\book.pgm
?????文件?????????730??2016-09-28?17:52??sift（matlab）\calcGrad.m
?????文件?????????125??2018-05-05?23:05??sift（matlab）\drawFeatures.m
?????文件????????1081??2018-05-05?23:04??sift（matlab）\drawMatched.m
?????文件?????????272??2018-05-05?23:15??sift（matlab）\gaussian.m
?????文件????????7270??2018-05-07?15:34??sift（matlab）\getFeatures.m
?????文件?????????549??2016-09-28?17:52??sift（matlab）\hist2Descr.m
?????文件????????1272??2016-09-28?17:52??sift（matlab）\interpHistEntry.m
?????文件????????2252??2018-05-07?14:37??sift（matlab）\interpLocation.m
?????文件?????????631??2018-05-06?21:52??sift（matlab）\isEdgeLike.m
?????文件?????????428??2018-06-07?09:44??sift（matlab）\jpg2pgm.m
?????文件????????3198??2016-09-28?17:52??sift（matlab）\LICENSE
?????文件?????????991??2018-05-07?17:20??sift（matlab）\match.m
?????文件?????????858??2016-09-28?17:52??sift（matlab）\oriHist.m
?????文件?????????527??2016-09-28?17:52??sift（matlab）\README.md
?????文件??????196623??2016-09-28?17:52??sift（matlab）\scene.pgm
?????文件?????????388??2018-05-07?15:37??sift（matlab）\smoothOriHist.m
?????文件?????????453??2018-06-08?21:53??sift（matlab）\swSift.m
?????文件???????62515??2018-06-07?09:44??sift（matlab）\test1.pgm
?????文件???????62515??2018-06-07?09:46??sift（matlab）\test2.pgm