function?outval?=?avg_gradient（img）?
%?平均梯度，也稱為清晰度，反映了圖像中的微小細節反差與紋理變化特征，同時也反映了圖像的清晰度，越大越清晰
?
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
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?????文件????????560??2016-01-26?22:17??圖像清晰度評價指標Matlab\Avg_Gradient.m

?????文件????????757??2015-12-23?16:05??圖像清晰度評價指標Matlab\cross_entropy.m

?????文件????????234??2015-12-23?16:05??圖像清晰度評價指標Matlab\entropy.m

?????文件?????921654??2015-12-23?16:05??圖像清晰度評價指標Matlab\labA.jpg

?????文件?????921654??2015-12-23?16:05??圖像清晰度評價指標Matlab\labB.jpg

?????文件???????1974??2015-12-23?16:05??圖像清晰度評價指標Matlab\mi.m

?????文件???????1388??2015-12-23?16:05??圖像清晰度評價指標Matlab\nmi.m

?????文件????????555??2015-12-23?16:05??圖像清晰度評價指標Matlab\psnr.m

?????文件???????3191??2015-12-23?16:05??圖像清晰度評價指標Matlab\Qabf.m

?????文件??????46868??2015-12-23?16:06??圖像清晰度評價指標Matlab\result_lab.jpg

?????文件???????4482??2015-12-23?16:06??圖像清晰度評價指標Matlab\ssim.m

?????文件??????35328??2016-03-24?14:21??圖像清晰度評價指標Matlab\圖像清晰度評價函數說明.doc

?????目錄??????????0??2017-05-02?17:20??圖像清晰度評價指標Matlab

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??????????????1938645????????????????????13