function?d=db（IIn）
%%?計算信噪比?SNR?
%%?輸入?I為原始無噪聲信號?In?為噪聲信號
%%?snr=db（IIn）;

n=I-In;?%?計算噪聲
Ps?=?sum（sum（（I?-?mean（mean（I）））.^2））;?%?信號強度
Pn?=?sum（sum（n.^2））;?%?噪聲強度

d=10*log10（Ps/Pn）;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2014-03-24?11:11??非局部去噪\
?????目錄???????????0??2014-03-24?11:11??非局部去噪\NLMeans\
?????文件???????66614??2014-03-24?11:11??非局部去噪\NLMeans\barbara.bmp
?????文件???????17464??2014-03-24?11:11??非局部去噪\NLMeans\barbara128.bmp
?????文件????????5176??2014-03-24?11:11??非局部去噪\NLMeans\barbara64.bmp
?????文件???????66616??2014-03-24?11:11??非局部去噪\NLMeans\bartexture.bmp
?????文件???????66616??2014-03-24?11:11??非局部去噪\NLMeans\bridge.bmp
?????文件???????17464??2014-03-24?11:11??非局部去噪\NLMeans\bridge128.bmp
?????文件????????5176??2014-03-24?11:11??非局部去噪\NLMeans\bridge64.bmp
?????文件???????66616??2014-03-24?11:11??非局部去噪\NLMeans\cameraman.bmp
?????文件?????????229??2014-03-24?11:11??非局部去噪\NLMeans\db.m
?????文件???????66616??2014-03-24?11:11??非局部去噪\NLMeans\dog.bmp
?????文件????????2421??2014-03-24?11:11??非局部去噪\NLMeans\filters.m
?????文件???????66616??2014-03-24?11:11??非局部去噪\NLMeans\lena.bmp
?????文件???????17464??2014-03-24?11:11??非局部去噪\NLMeans\lena128.bmp
?????文件????????5176??2014-03-24?11:11??非局部去噪\NLMeans\lena64.bmp
?????文件???????66616??2014-03-24?11:11??非局部去噪\NLMeans\manmade.bmp
?????文件???????17464??2014-03-24?11:11??非局部去噪\NLMeans\manmade128.bmp
?????文件????????5176??2014-03-24?11:11??非局部去噪\NLMeans\manmade64.bmp
?????文件????????2222??2014-03-24?11:11??非局部去噪\NLMeans\NLmeans.m
?????文件???????66616??2014-03-24?11:11??非局部去噪\NLMeans\peppers.bmp
?????文件???????17464??2014-03-24?11:11??非局部去噪\NLMeans\peppers128.bmp
?????文件????????5176??2014-03-24?11:11??非局部去噪\NLMeans\peppers64.bmp
?????文件?????????649??2014-03-24?11:11??非局部去噪\NLMeans\Psnr.m
?????文件?????????481??2014-03-24?11:11??非局部去噪\NLMeans\SNR.m
?????文件?????????466??2014-03-24?11:11??非局部去噪\NLMeans\start.asv
?????文件????????1652??2014-03-24?11:11??非局部去噪\NLMeans\start.m
?????文件??????146944??2014-03-24?11:11??非局部去噪\NLMeans\Thumbs.db
?????文件?????????559??2014-03-24?11:11??非局部去噪\NLMeans\weight.m
?????文件???????90936??2014-03-24?11:11??非局部去噪\NLMeans\woman.bmp
?????文件???????89144??2014-03-24?11:11??非局部去噪\NLMeans\zebra.bmp
............此處省略2個文件信息