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????????607??2010-07-08?20:19??example_flash.m

?????文件????????285??2010-07-08?19:46??example_smoothing.m

?????文件????????957??2010-07-08?21:57??guidedfilter.m

?????文件???????2462??2011-05-03?04:12??guidedfilter_color.m

?????文件???????1111??2012-04-20?21:34??readme.txt

?????文件????2880056??2010-03-05?16:09??img_enhancement\tulips.bmp

?????文件?????947480??2010-07-08?22:24??img_feathering\toy-mask.bmp

?????文件?????947480??2010-07-08?22:24??img_feathering\toy.bmp

?????文件?????786488??2010-02-24?13:31??img_flash\cave-flash.bmp

?????文件?????786488??2010-02-24?13:30??img_flash\cave-noflash.bmp

?????文件??????77256??2010-02-27?16:16??img_smoothing\cat.bmp

?????文件????????931??2010-07-08?19:30??boxfilter.m

?????文件????????452??2010-07-08?20:22??example_enhancement.m

?????文件????????341??2010-07-08?22:24??example_feathering.m

?????目錄??????????0??2010-07-08?20:20??img_enhancement

?????目錄??????????0??2010-07-08?21:11??img_feathering

?????目錄??????????0??2010-07-08?19:45??img_flash

?????目錄??????????0??2010-07-08?19:45??img_smoothing

-----------?---------??----------?-----??----

??????????????6432394????????????????????18