%Name:		Chris?Shoemaker
%Course:	EER-280?-?Digital?Watermarking
%Project:?	CDMA?based?using?multiple?PN?sequences?embeded?into?whole?object
%???????????Watermark?embeding

clear?all;

%?save?start?time
start_time=cputime;

k=2;????????????????%?set?the?gain?factor?for?embeding

%?read?in?the?cover?object
file_name=‘_lena_std_bw.bmp‘;
cover_object=double（imread（file_name））;

%?determine?size?of?watermarked?image
Mc=size（cover_object1）;	%Height
Nc=size（cover_object2）;	%Width

%?read?in?the?message?image?and?reshape?it?into?a?vector
file_name=‘_copyright_small.bmp‘;
message=double（imread（file_name））;
Mm=size（message1）;	????????????????????????%Height
Nm=size（message2）;	????????????????????????%Width
message_vector=round（reshape（messageMm*Nm1）./256）;

%?read?in?key?for?PN?generator
file_name=‘_key.bmp‘;
key=double（imread（file_name））./256;

%?reset?MATLAB‘s?PN?generator?to?state?“key“
rand（‘state‘key）;

watermarked_image=cover_object;

%?when?message?contains?a?‘0‘?add?pn?sequence?with?gain?k?to?cover?image
for?kk=1:length（message_vector）
????pn_sequence=round（2*（rand（McNc）-0.5））;
????
????if?message（kk）?==?0
????????watermarked_image=watermarked_image+k*pn_sequence;
????end
end

%?convert?back?to?uint8
watermarked_image_uint8=uint8（watermarked_image）;

%?write?watermarked?Image?to?file
imwrite（watermarked_image_uint8‘cdma_watermarked.bmp‘‘bmp‘）;

%?display?processing?time
elapsed_time=cputime-start_time

%?calculate?the?PSNR
psnr=psnr（cover_objectwatermarked_image_uint8McNc）

%?display?watermarked?Image
figure（1）
imshow（watermarked_image_uint8[]）
title（‘Watermarked?Image‘）

?屬性????????????大小?????日期????時間???名稱
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?????文件???????1674??2002-05-31?04:26??各種數(shù)字水印的matlab源代碼\cdma_embed.m

?????文件???????1731??2002-05-30?23:46??各種數(shù)字水印的matlab源代碼\cdma_recover.m

?????文件???????2874??2002-05-31?03:37??各種數(shù)字水印的matlab源代碼\cor_embed.m

?????文件???????3248??2002-05-31?04:20??各種數(shù)字水印的matlab源代碼\cor_embed_mod.m

?????文件???????2320??2002-05-31?03:23??各種數(shù)字水印的matlab源代碼\cor_recover.m

?????文件???????2597??2002-05-30?23:48??各種數(shù)字水印的matlab源代碼\cor_recover_mod.m

?????文件???????3503??2002-05-31?13:01??各種數(shù)字水印的matlab源代碼\dct1_embed.m

?????文件???????1716??2002-05-31?13:00??各種數(shù)字水印的matlab源代碼\dct1_recover.m

?????文件???????3287??2002-05-31?12:59??各種數(shù)字水印的matlab源代碼\dct2_embed.m

?????文件???????4133??2002-05-31?13:33??各種數(shù)字水印的matlab源代碼\dct2_embed_mod.m

?????文件???????2687??2002-05-31?12:59??各種數(shù)字水印的matlab源代碼\dct2_recover.m

?????文件???????3165??2002-05-31?13:52??各種數(shù)字水印的matlab源代碼\dct2_recover_mod.m

?????文件???????1819??2002-05-31?15:56??各種數(shù)字水印的matlab源代碼\dwt_embed.m

?????文件???????1716??2002-05-31?15:57??各種數(shù)字水印的matlab源代碼\dwt_recover.m

?????文件???????1510??2002-05-31?02:00??各種數(shù)字水印的matlab源代碼\lsb_embed.m

?????文件????????926??2002-05-30?23:48??各種數(shù)字水印的matlab源代碼\lsb_recover.m

?????文件???????1034??2002-05-27?11:41??各種數(shù)字水印的matlab源代碼\pn_period.m

?????文件????????579??2002-05-28?14:15??各種數(shù)字水印的matlab源代碼\pn_test.m

?????文件????????727??2002-05-31?15:38??各種數(shù)字水印的matlab源代碼\psnr.m

?????文件?????????52??2008-10-15?14:37??各種數(shù)字水印的matlab源代碼\readme.txt

?????文件???????2120??2002-05-25?19:28??各種數(shù)字水印的matlab源代碼\_copyright.bmp

?????文件?????263222??2002-05-30?02:04??各種數(shù)字水印的matlab源代碼\_copyright_large.bmp

?????文件???????1188??2002-05-25?21:10??各種數(shù)字水印的matlab源代碼\_copyright_small.bmp

?????文件???????1220??2002-05-25?14:48??各種數(shù)字水印的matlab源代碼\_key.bmp

?????文件?????263224??2002-05-25?12:42??各種數(shù)字水印的matlab源代碼\_lena_std_bw.bmp

?????文件???????1847??2011-05-05?21:24??各種數(shù)字水印的matlab源代碼\dct2_embed.asv

????..A.SH.?????19968??2011-05-09?14:50??各種數(shù)字水印的matlab源代碼\Thumbs.db

?????目錄??????????0??2008-10-15?14:37??各種數(shù)字水印的matlab源代碼

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???????????????594087????????????????????28

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