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(shí)間???名稱
-----------?---------??----------?-----??----
?????文件?????????931??2018-11-25?16:21??boxfilter.m
?????文件???????58499??2018-11-30?12:21??DIPGUI.fig
?????文件???????18044??2018-11-30?12:21??DIPGUI.m
?????文件????14485294??2018-12-01?21:22??DIP課堂展示.pptx
?????文件????????1027??2018-11-25?16:19??guidedfilter.m
?????文件????????2301??2018-11-30?10:57??hazeremoval.m
?????文件??????309863??2018-11-25?11:56??test1.jpg
?????文件??????212070??2018-11-25?17:58??test11.jpg
?????文件??????170586??2018-11-25?12:06??test3.jpg
?????文件??????338636??2018-11-25?12:00??test6.png
?????文件??????456117??2018-11-25?12:01??test7.png
?????文件??????245186??2018-11-25?12:06??test9.png