avi?=?aviread（‘highway.avi‘）;
video?=?{avi.cdata};
highway1?=?cat（4video{1:2:end}）;
nframes?=?size（highway14）;
for?f?=?1:nframes
????highway（::f）?=?rgb2gray（highway1（:::f））;??
end


subplot（131）
imshow（highway（::142））;
subplot（132）;
imshow（highway（::143））;
subplot（133）;
imshow（highway（::142）-highway（::143））;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-12-19?10:26??Motion-Detection?Background?Substruction\
?????文件?????????346??2010-11-12?08:59??Motion-Detection?Background?Substruction\extract.m
?????文件?????????477??2010-11-12?10:10??Motion-Detection?Background?Substruction\extractroom.m
?????文件?????????236??2018-12-19?10:29??Motion-Detection?Background?Substruction\run.m
?????文件??????292486??2018-12-19?09:35??Motion-Detection?Background?Substruction\SampleVideo.avi
?????文件????????2731??2018-12-19?10:34??Motion-Detection?Background?Substruction\tracking.m