function?value=myPSNR（coverwater_cover）
M=size（cover1）;
N=size（cover2）;
Mm=size（water_cover1）;
Nm=size（water_cover2）;
if?M~=Mm||N~=Nm
????error（‘the?size?of?the?two?photo?is?not?the?same‘）;
else
????MNm=M*N;
????mn=cover（1:MNm）;
????mm=water_cover（1:MNm）;
????mse=sum（（mn（1:MNm）-mm（1:MNm））.^2）/MNm;
????dd=max（max（water_cover.^2））;
????psnr=10log10（dd/mse）;
end
value=psnr;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????5174??2011-04-06?20:08??信息隱藏實驗\dcs.bmp

?????文件??????66614??2011-03-27?20:03??信息隱藏實驗\key.bmp

?????文件?????263222??2003-06-30?20:59??信息隱藏實驗\lena.bmp

?????文件????????395??2011-04-13?16:54??信息隱藏實驗\myPSNR.asv

?????文件????????393??2011-04-13?16:57??信息隱藏實驗\myPSNR.m

?????文件???????5174??2011-04-06?20:08??信息隱藏實驗\擴頻水印\dcs.bmp

?????文件???????3230??2011-04-16?14:26??信息隱藏實驗\擴頻水印\dct2_embed.asv

?????文件???????3364??2011-04-16?15:00??信息隱藏實驗\擴頻水印\dct2_embed.m

?????文件???????2702??2011-04-06?20:40??信息隱藏實驗\擴頻水印\dct2_recover.m

?????文件???????2562??2011-04-16?15:17??信息隱藏實驗\擴頻水印\dct2_recovery.m

?????文件?????263222??2011-04-16?15:00??信息隱藏實驗\擴頻水印\dct2_watermarked.bmp

?????文件????????141??2011-04-16?14:50??信息隱藏實驗\擴頻水印\judgSIM.m

?????文件??????66614??2011-03-27?20:03??信息隱藏實驗\擴頻水印\key.bmp

?????文件?????263222??2003-06-30?20:59??信息隱藏實驗\擴頻水印\lena.bmp

?????文件?????263222??2011-04-16?15:15??信息隱藏實驗\擴頻水印\medfiltAttack.bmp

?????文件????????109??2011-04-16?15:14??信息隱藏實驗\擴頻水印\medfiltAttack.m

?????文件???????5174??2011-04-16?15:00??信息隱藏實驗\擴頻水印\message1.bmp

?????文件????????390??2011-04-13?17:06??信息隱藏實驗\擴頻水印\myBER.m

?????文件????????446??2011-04-16?13:50??信息隱藏實驗\擴頻水印\mySIM.asv

?????文件????????438??2011-04-16?14:21??信息隱藏實驗\擴頻水印\mySIM.m

?????文件???????5174??2011-04-16?15:01??信息隱藏實驗\擴頻水印\recovered_message.bmp

?????文件???????5174??2011-04-16?15:17??信息隱藏實驗\擴頻水印\recovered_message_attack.bmp

????..A.SH.??????9216??2011-04-16?16:21??信息隱藏實驗\擴頻水印\Thumbs.db

?????文件????????407??2011-04-13?21:29??信息隱藏實驗\最低比特位隱藏\fneg.m

?????文件????????401??2011-04-13?21:25??信息隱藏實驗\最低比特位隱藏\fpos.m

?????文件?????263222??2003-06-30?20:59??信息隱藏實驗\最低比特位隱藏\lena.bmp

?????文件????????739??2011-04-16?12:15??信息隱藏實驗\最低比特位隱藏\lsbrecoverytest.asv

?????文件???????1430??2011-04-16?12:33??信息隱藏實驗\最低比特位隱藏\lsbtest.asv

?????文件???????1513??2011-04-16?11:29??信息隱藏實驗\最低比特位隱藏\lsb_embed.asv

?????文件???????1475??2011-04-16?12:36??信息隱藏實驗\最低比特位隱藏\lsb_embed.m

............此處省略45個文件信息