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

?????文件?????203068??2013-10-22?09:58??結果圖\spot4\TM5andspot4band4（first）.tif

?????文件?????203056??2013-10-22?09:52??結果圖\spot4\TM5andspot4band1（first）.tif

?????文件?????203056??2013-10-22?09:54??結果圖\spot4\TM5andspot4band2（first）.tif

?????文件?????203060??2013-10-22?09:57??結果圖\spot4\TM5andspot4band3（first）.tif

?????文件?????198860??2013-10-22?10:06??結果圖\spot4\TM5andspot4band1.tif

?????文件?????198860??2013-10-22?10:07??結果圖\spot4\TM5andspot4band2.tif

?????文件?????198860??2013-10-22?10:07??結果圖\spot4\TM5andspot4band3.tif

?????文件?????198860??2013-10-22?10:08??結果圖\spot4\TM5andspot4band4.tif

?????文件?????203734??2013-10-22?09:59??結果圖\spot5\TM5andspot5band1（first）.tif

?????文件?????203664??2013-10-22?10:00??結果圖\spot5\TM5andspot5band2（first）.tif

?????文件?????203750??2013-10-22?10:04??結果圖\spot5\TM5andspot5band3（first）.tif

?????文件?????203470??2013-10-22?10:02??結果圖\spot5\TM5andspot5band4（first）.tif

?????文件?????198860??2013-10-22?10:08??結果圖\spot5\TM5andspot5band1.tif

?????文件?????198860??2013-10-22?10:09??結果圖\spot5\TM5andspot5band2.tif

?????文件?????198860??2013-10-22?10:09??結果圖\spot5\TM5andspot5band3.tif

?????文件?????198860??2013-10-22?10:10??結果圖\spot5\TM5andspot5band4.tif

?????文件??????68133??2013-09-12?11:22??應用圖像及程序\spot4（256?256）band1.tif

?????文件??????68133??2013-09-12?11:22??應用圖像及程序\spot4（256?256）band2.tif

?????文件??????68133??2013-09-12?11:22??應用圖像及程序\spot4（256?256）band3.tif

?????文件??????68133??2013-09-12?11:23??應用圖像及程序\spot4（256?256）band4.tif

?????文件??????67782??2013-09-12?10:48??應用圖像及程序\spot5（256?256）band1.tif

?????文件??????67782??2013-09-12?10:49??應用圖像及程序\spot5（256?256）band2.tif

?????文件??????67782??2013-09-12?10:49??應用圖像及程序\spot5（256?256）band3.tif

?????文件??????67782??2013-09-12?10:50??應用圖像及程序\spot5（256?256）band4.tif

?????文件?????202956??2013-09-12?10:04??應用圖像及程序\TM（resize）（256?256）.tif

?????文件?????202956??2013-09-12?11:08??應用圖像及程序\TM5（resize）（256?256）.tif

?????文件???????5579??2013-10-22?10:18??應用圖像及程序\sijinzhi.m

?????文件????????352??2013-10-22?10:19??應用圖像及程序\dwt4.m

?????文件????????367??2013-10-22?10:20??應用圖像及程序\rdwt4.m

?????文件????????485??2009-10-02?10:10??應用圖像及程序\avg_gradient.m

............此處省略11個文件信息