function?outval?=?avg_gradient（img）?
%?OUTVAL?=?AVG_GRADIENT（IMG）?
?
if?nargin?==?1?
????img?=?double（img）;?
????%?Get?the?size?of?img?
????[rcb]?=?size（img）;?
?????
????dx?=?1;?
????dy?=?1;?
????for?k?=?1?:?b?
????????band?=?img（::k）;?
????????[dzdxdzdy]?=?gradient（banddxdy）;?
????????s?=?sqrt（（dzdx?.^?2?+?dzdy?.^2）?./?2）;?
????????g（k）?=?sum（sum（s））?/?（（r?-?1）?*?（c?-?1））;?
????end?
????outval?=?mean（g）;?
else?
????error（‘Wrong?number?of?input!‘）;?
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2011-12-07?10:11??圖像融合評價標準各項指標\
?????文件?????????485??2009-10-02?10:10??圖像融合評價標準各項指標\avg_gradient.m
?????文件?????????994??2011-12-07?09:54??圖像融合評價標準各項指標\cross_entropy.m
?????文件?????????621??2009-10-02?10:10??圖像融合評價標準各項指標\edge_intensity.m
?????文件?????????384??2008-07-02?17:38??圖像融合評價標準各項指標\figure_definition.m
?????文件????????1250??2011-12-05?17:14??圖像融合評價標準各項指標\mutinf.m
?????文件?????????487??2011-11-25?10:29??圖像融合評價標準各項指標\psnr.m
?????文件?????????973??2011-12-07?10:12??圖像融合評價標準各項指標\readme.txt
?????文件?????????825??2011-12-07?09:56??圖像融合評價標準各項指標\relatively_warp.m
?????文件?????????140??2011-12-06?11:20??圖像融合評價標準各項指標\rmse.m
?????文件?????????617??2011-12-05?16:55??圖像融合評價標準各項指標\shannon.m
?????文件?????????414??2008-07-02?17:38??圖像融合評價標準各項指標\space_frequency.m
?????文件????????6426??2011-12-06?16:28??圖像融合評價標準各項指標\ssim.m
?????文件?????????252??2011-12-06?11:03??圖像融合評價標準各項指標\variance.m