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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??image?fusion13\
?????文件?????????990??2016-09-23?09:58??image?fusion13\avg_gradient.m
?????文件????????1499??2016-09-23?09:58??image?fusion13\cross_entropy.m
?????文件????????1126??2016-09-23?09:58??image?fusion13\edge_intensity.m
?????文件?????????889??2016-09-23?09:58??image?fusion13\figure_definition.m
?????文件????????1755??2016-09-23?09:58??image?fusion13\mutinf.m
?????文件?????????992??2016-09-23?09:59??image?fusion13\psnr.m
?????文件?????????973??2011-12-07?10:12??image?fusion13\readme.txt
?????文件????????1330??2016-09-23?09:59??image?fusion13\relatively_warp.m
?????文件?????????645??2016-09-23?09:59??image?fusion13\rmse.m
?????文件????????1122??2016-09-23?10:00??image?fusion13\shannon.m
?????文件?????????919??2016-09-23?10:00??image?fusion13\space_frequency.m
?????文件????????6931??2016-09-23?10:00??image?fusion13\ssim.m
?????文件?????????757??2016-09-23?10:00??image?fusion13\variance.m