function?imDst?=?boxfilter（imSrc?r）??
??
%???BOXFILTER???O（1）?time?box?filtering?using?cumulative?sum??
%??
%???-?Definition?imDst（x?y）=sum（sum（imSrc（x-r:x+ry-r:y+r）））;??
%???-?Running?time?independent?of?r;???
%???-?Equivalent?to?the?function:?colfilt（imSrc?[2*r+1?2*r+1]?‘sliding‘?@sum）;??
%???-?But?much?faster.??
??
[hei?wid]?=?size（imSrc）;??
imDst?=?zeros（size（imSrc））;??
??
%cumulative?sum?over?Y?axis??
imCum?=?cumsum（imSrc?1）;??
%difference?over?Y?axis??
imDst（1:r+1?:）?=?imCum（1+r:2*r+1?:）;??
imDst（r+2:hei-r?:）?=?imCum（2*r+2:hei?:）?-?imCum（1:hei-2*r-1?:）;??
imDst（hei-r+1:hei?:）?=?repmat（imCum（hei?:）?[r?1]）?-?imCum（hei-2*r:hei-r-1?:）;??
??
%cumulative?sum?over?X?axis??
imCum?=?cumsum（imDst?2）;??
%difference?over?Y?axis??
imDst（:?1:r+1）?=?imCum（:?1+r:2*r+1）;??
imDst（:?r+2:wid-r）?=?imCum（:?2*r+2:wid）?-?imCum（:?1:wid-2*r-1）;??
imDst（:?wid-r+1:wid）?=?repmat（imCum（:?wid）?[1?r]）?-?imCum（:?wid-2*r:wid-r-1）;??
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2015-04-21?16:55??基于暗通道的圖像去霧算法（導向濾波）\
?????文件?????????977??2015-04-08?14:16??基于暗通道的圖像去霧算法（導向濾波）\boxfilter.m
?????文件????????1524??2015-04-21?16:49??基于暗通道的圖像去霧算法（導向濾波）\guided.m
?????文件?????????490??2015-04-08?15:52??基于暗通道的圖像去霧算法（導向濾波）\guidedfilter.m