function?[fx?fy?ft]?=?computeDerivatives（im1?im2）

if?size（im21）==0
????im2=zeros（size（im1））;
end

%?Horn-Schunck?original?method
fx?=?conv2（im10.25*?[-1?1;?-1?1]‘same‘）?+?conv2（im2?0.25*[-1?1;?-1?1]‘same‘）;
fy?=?conv2（im1?0.25*[-1?-1;?1?1]?‘same‘）?+?conv2（im2?0.25*[-1?-1;?1?1]?‘same‘）;
ft?=?conv2（im1?0.25*ones（2）‘same‘）?+?conv2（im2?-0.25*ones（2）‘same‘）;

%?derivatives?as?in?Barron
%?fx=?conv2（im1（1/12）*[-1?8?0?-8?1]‘same‘）;
%?fy=?conv2（im1（1/12）*[-1?8?0?-8?1]‘‘same‘）;
%?ft?=?conv2（im1?0.25*ones（2）‘same‘）?+?conv2（im2?-0.25*ones（2）‘same‘）;
%?fx=-fx;fy=-fy;

%?An?alternative?way?to?compute?the?spatiotemporal?derivatives?is?to?use?simple?finite?difference?masks.
%?fx?=?conv2（im1[1?-1]）;
%?fy?=?conv2（im1[1;?-1]）;
%?ft=?im2-im1;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????????759??2016-05-17?10:35??computeDerivatives.m
?????文件????????1081??2016-05-17?10:35??gaussFilter.m
?????文件????????1386??2016-05-24?15:22??plotFlow.m
?????文件????????2785??2016-06-14?11:48??realDBSCAN.m
?????文件?????????944??2016-05-17?10:35??smoothImg.m
?????文件??????????48??2016-05-31?11:03??spead.m
?????文件????????4690??2016-06-16?14:53??zhu2.m
?????文件????????1291??2016-05-23?16:44??HS.m