%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=12;????????????????%?set?the?gain?factor?for?embeding

%?read?in?the?cover?object
file_name=‘test.jpg‘?%‘_lena_std_bw.bmp‘;
cover_object=double（imread（file_name））;
figure（1）
imshow（cover_object[]）;


%?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=fix（reshape（messageMm*Nm1）./2）;

%?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‘1）;
%rand（‘state‘key）;

watermarked_image=cover_object;


%?when?message?contains?a?‘0‘?add?pn?sequence?with?gain?k?to?cover?image
pn_sequence=round（2*（rand（McNc）-0.5））;
psnr1=psnr（cover_objectpn_sequenceMcNc）
%for?kk=1:length（message_vector）
????
????
????%if?message（kk）?==?0
?%???if?message（kk）?==?1
????????
??%??end
%end
watermarked_image=watermarked_image+k*pn_sequence;
%?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（2）
imshow（watermarked_image_uint8[]）
figure（3）
imshow（pn_sequence[]）
title（‘Watermarked?Image‘）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2013-05-24?18:02??watermark綜述+代碼\
?????文件????????1859??2003-06-25?21:59??watermark綜述+代碼\cdma_embed.m
?????文件????????1732??2003-06-25?22:01??watermark綜述+代碼\cdma_recover.m
?????文件??????148534??2003-06-25?21:58??watermark綜述+代碼\cdma_watermarked.bmp
?????文件????????2954??2003-07-25?16:02??watermark綜述+代碼\cor_embed.m
?????文件????????3248??2002-05-31?18:06??watermark綜述+代碼\cor_embed_mod.m
?????文件????????2320??2002-05-31?18:06??watermark綜述+代碼\cor_recover.m
?????文件????????2597??2002-05-31?18:06??watermark綜述+代碼\cor_recover_mod.m
?????文件???????15446??2002-11-19?21:35??watermark綜述+代碼\cs.bmp
?????文件????????3563??2003-06-26?17:28??watermark綜述+代碼\dct1_embed.m
?????文件????????1715??2002-11-19?20:46??watermark綜述+代碼\dct1_recover.m
?????文件??????148534??2003-06-26?17:29??watermark綜述+代碼\dct1_watermarked.bmp
?????文件????????3290??2002-11-18?09:55??watermark綜述+代碼\dct2_embed.m
?????文件????????4133??2002-05-31?18:06??watermark綜述+代碼\dct2_embed_mod.m
?????文件????????2687??2002-05-31?18:06??watermark綜述+代碼\dct2_recover.m
?????文件????????3165??2002-05-31?18:06??watermark綜述+代碼\dct2_recover_mod.m
?????文件????????2274??2003-07-02?11:32??watermark綜述+代碼\dwt_embed.m
?????文件????????1720??2003-07-02?14:29??watermark綜述+代碼\dwt_recover.m
?????文件??????148534??2003-11-24?17:11??watermark綜述+代碼\dwt_watermarked.bmp
?????文件?????????801??2002-11-12?18:37??watermark綜述+代碼\fig11.gif
?????文件??????147630??2002-11-12?18:37??watermark綜述+代碼\fig13s.gif
?????文件??????122655??2002-11-12?18:51??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking.htm
?????目錄???????????0??2013-05-24?18:02??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking_files\
?????文件?????????307??2002-11-12?18:38??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking_files\eq1.gif
?????文件????????3237??2002-11-12?18:37??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking_files\fig01.gif
?????文件?????????762??2002-11-12?18:37??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking_files\fig02.gif
?????文件????????1501??2002-11-12?18:37??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking_files\fig03a.gif
?????文件????????4189??2002-11-12?18:37??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking_files\fig03b.gif
?????文件?????????377??2002-11-12?18:37??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking_files\fig04.gif
?????文件?????????575??2002-11-12?18:37??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking_files\fig05.gif
?????文件????????3060??2002-11-12?18:37??watermark綜述+代碼\Hidden?Bits?A?Survey?of?Techniques?for?Digital?Watermarking_files\fig06.gif
............此處省略73個文件信息