%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
-----------?---------??----------?-----??----
?????目錄???????????0??2018-08-18?12:33??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\
?????文件????????2120??2002-05-25?19:28??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\_copyright.bmp
?????文件??????263222??2002-05-30?02:04??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\_copyright_large.bmp
?????文件????????1188??2002-05-25?21:10??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\_copyright_small.bmp
?????文件????????1220??2002-05-25?14:48??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\_key.bmp
?????文件??????263224??2002-05-25?12:42??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\_lena_std_bw.bmp
?????文件????????1674??2002-05-31?04:26??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\cdma_embed.m
?????文件????????1731??2002-05-30?23:46??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\cdma_recover.m
?????文件????????2874??2002-05-31?03:37??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\cor_embed.m
?????文件????????3248??2002-05-31?04:20??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\cor_embed_mod.m
?????文件????????2320??2002-05-31?03:23??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\cor_recover.m
?????文件????????2597??2002-05-30?23:48??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\cor_recover_mod.m
?????文件????????3503??2002-05-31?13:01??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\dct1_embed.m
?????文件????????1716??2002-05-31?13:00??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\dct1_recover.m
?????文件??????263222??2018-08-18?12:34??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\dct1_watermarked.bmp
?????文件????????3287??2002-05-31?12:59??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\dct2_embed.m
?????文件????????4133??2002-05-31?13:33??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\dct2_embed_mod.m
?????文件????????2687??2002-05-31?12:59??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\dct2_recover.m
?????文件????????3165??2002-05-31?13:52??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\dct2_recover_mod.m
?????文件????????1819??2002-05-31?15:56??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\dwt_embed.m
?????文件????????1716??2002-05-31?15:57??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\dwt_recover.m
?????文件????????1510??2002-05-31?02:00??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\lsb_embed.m
?????文件?????????926??2002-05-30?23:48??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\lsb_recover.m
?????文件????????1034??2002-05-27?11:41??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\pn_period.m
?????文件?????????579??2002-05-28?14:15??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\pn_test.m
?????文件?????????727??2002-05-31?15:38??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\psnr.m
?????文件??????????52??2008-10-15?14:37??MATLAB數(shù)字水印\數(shù)字水印的matlab源代碼\readme.txt
?????目錄???????????0??2010-01-21?22:36??MATLAB數(shù)字水印\圖像數(shù)字水印的方案畢業(yè)論文MATLAB（DCT+DWT）\
?????文件?????1335296??2007-05-07?21:21??MATLAB數(shù)字水印\圖像數(shù)字水印的方案畢業(yè)論文MATLAB（DCT+DWT）\MATLAB（DCT+DWT）.doc