function??name_ex=extract（containcontain_markerSORT_INDnameselgausaltjpegfiltang）???%%3次嵌入


%%攻擊
switch?sel
??????case?1????
????????contain_marker=imnoise（uint8（contain_marker）‘gaussian‘0gau）;???????%高斯
??????case?2
???????contain_marker=imnoise（uint8（contain_marker）‘salt?&?pepper‘salt）;??????%椒鹽
??????case?3
???????imwrite（uint8（contain_marker）‘temp.jpg‘‘jpg‘‘quality‘jpeg）;??
???????file_name=‘temp.jpg‘;
???????contain_marker=imread（file_name）;
??????case?4
????????figureimshow（uint8（contain_marker））;???????????????????????????????????%剪切
????????[XYcontain_marker1rect]=imcrop;
?????????for?i=0:round（rect（4））
???????????for?j=0:round（rect（3））
??????????????contain_marker（round（rect（2））+iround（rect（1））+j）=0;
???????????end
?????????end
????case?5
????????contain_marker=reimrotate（contain_markerang）;??????%旋轉
end

%%沒有攻擊
if?sel~=0?&&?filt==0
psnr=PSNR（containcontain_marker）;
figureimshow（uint8（contain_marker））;
title_string=strcat（‘處理過的圖象?PNSR:‘num2str（psnr））;
title（title_string）;
end




%%濾波
switch?filt
??????case?1????
???????????%%中值濾波
??????????contain_marker=medfilt2（contain_marker[3?3]）;?
??????case?2
???????????%均值濾波
??????????filter_temp=fspecial（‘average‘3）;contain_marker=filter2（filter_tempcontain_marker）;
??????case?3
??????????%%%%低通濾波
??????????contain_marker=double（contain_marker）;???
??????????filter_temp=[1?1?1;1?2?1?;1?1?1]/10;
??????????contain_marker=filter2（filter_tempcontain_marker）;
??????case?4
???????????%%%%高通濾波
???????????contain_marker=double（contain_marker）;???
???????????filter_temp=[1?1?1;1?1?1?;1?1?1]/9;
???????????contain_marker=filter2（filter_tempcontain_marker）;

????case?5
???????%%銳化濾波
????????????contain_marker=double（contain_marker）;??
????????????filter_temp=[0?1?0
????????????1?-4?0
????????????0?1?0];
????????????contain_marker_temp=conv2（contain_markerfilter_temp‘same‘）;
????????????contain_marker=contain_marker-contain_marker_temp;
end



%%沒有濾波

if?filt~=0?
psnr=PSNR（containcontain_marker）;
figureimshow（uint8（contain_marker））;
title_string=strcat（‘濾波后的圖象?PNSR:‘num2str（psnr））;
title（title_string）;
end



[CA1_EXCH1_EXCV1_EXCD1_EX]=dwt2（contain_marker‘haar‘）;
[CA2_EXCH2_EXCV2_EXCD2_EX]=dwt2（CA1_EX‘haar‘）;??????%二級變換
%%計算均值
[rownum_excolnum_ex]=size（CA2_EX）;
[rownum_shuicolnum_shui]=size（name）;

AVG_EX=1000*ones（rownum_excolnum_ex）;
for（i=2:rownum_ex-1）
????
????if（mod（i2）==0）??????%隔列
????????colnum_sta=2;
????else
????????colnum_sta=3;
????end
????
????for?（j=colnum_sta:2:colnum_ex-1）????%隔列
????????AVG_EX（ij）=1/4*（CA2_EX（i-1j）+CA2_EX（i+1j）+CA2_EX（ij-1）+CA2_EX（ij+1））;???
????end
end

AVG_EX_ARR=reshape（AVG_EX1rownum_ex*colnum_ex）;
length=rownum_shui*colnum_shui;????%水印長度
for?times_ex=0:2
????for?i=1:length
????????if?CA2_EX（SORT_IND（i+times_ex*length））>AVG_EX_ARR（SORT_IND（i+times_ex*length））
?????????????name_temp（i+times_ex*length）=1;
????????e

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2015-06-10?12:54??code2\
?????文件?????????712??2015-06-05?14:29??code2\LSB.m
?????文件????????2528??2015-06-05?17:02??code2\LSBextract.asv
?????文件????????2499??2015-06-05?15:44??code2\LSBextract.m
?????文件?????????405??2015-06-05?14:01??code2\PSNR.m
?????文件????????4061??2015-06-05?14:25??code2\extract.asv
?????文件????????4043??2015-06-05?15:45??code2\extract.m
?????文件????????3602??2015-06-05?14:30??code2\extract_name.asv
?????文件????????3588??2015-06-05?15:44??code2\extract_name.m
?????文件?????????190??2015-06-05?13:57??code2\name32x32.bmp
?????文件?????????945??2015-06-05?20:58??code2\name32x32.jpg
?????文件????????2572??2015-06-05?13:37??code2\name_imbed.asv
?????文件????????2666??2015-06-05?18:05??code2\name_imbed.m
?????文件?????????428??2015-06-05?15:51??code2\nc.m
?????文件???????14987??2015-06-05?11:30??code2\nike.jpg
?????文件???????33859??2015-06-05?15:11??code2\nvlang512x512.jpg
?????文件?????????719??2015-06-05?14:41??code2\reimrotate.m
?????文件???????12432??2015-06-05?19:15??code2\temp.jpg
?????文件????????3231??2015-06-05?13:41??code2\testname.m
?????文件????????4854??2015-06-05?20:59??code2\upt.bmp
?????文件????????7483??2015-06-05?20:57??code2\watermaked.fig
?????文件???????25432??2015-06-05?14:38??code2\watermaked.m