function?R=average（Ij）;
%求平均，表示將2（J）*2（J）大小子塊的灰度圖像中的鄰近四像素點灰度求平均抽取，變成2（J-1）*2（J-1）大小的子塊。
for?k=1:j/2
???for?l=1:j/2
??????R（kl）=round（（I（2*k-12*l-1）+I（2*k2*l）+I（2*k-12*l）+I（2*k2*l-1））/4）;
???end?
end

?屬性????????????大小?????日期????時間???名稱
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?????文件????????260??2002-03-07?16:31??上次的MATLAB文檔\average.m

?????文件????????528??2002-03-05?10:20??上次的MATLAB文檔\cal.m

?????文件???????2069??2002-03-11?10:46??上次的MATLAB文檔\code.m

?????文件???????8921??2002-01-25?11:11??上次的MATLAB文檔\data.m

?????文件??????65536??1998-10-06?21:58??上次的MATLAB文檔\GIRL.DAT

?????文件???????2125??2002-01-29?08:54??上次的MATLAB文檔\important.m

?????文件????????144??2002-03-07?16:22??上次的MATLAB文檔\in.m

?????文件????????513??2002-03-07?14:03??上次的MATLAB文檔\leaf.m

?????文件??????65666??2002-01-22?17:25??上次的MATLAB文檔\lena1.tif

?????文件????????535??2002-03-07?18:55??上次的MATLAB文檔\Ln.m

?????文件????????344??2002-03-07?14:51??上次的MATLAB文檔\newleaf.m

?????文件???????2129??2002-03-11?10:55??上次的MATLAB文檔\original_Jaquain.m

?????文件????????186??2002-03-07?16:15??上次的MATLAB文檔\out.m

?????文件?????????39??2002-01-23?14:49??上次的MATLAB文檔\pp.m

?????文件????????729??2002-03-11?12:34??上次的MATLAB文檔\recover.m

?????文件????????656??2002-03-07?21:01??上次的MATLAB文檔\rhdp.m

?????文件????????470??2002-03-11?12:37??上次的MATLAB文檔\SNR.m

?????目錄??????????0??2009-11-18?20:14??上次的MATLAB文檔

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???????????????150850????????????????????18