μú1?? D÷??
?????úoíí???μ?1?·oó|ó?￡?′ó′óμ?·?±?á?è?????è?D??￠oí??á÷D??￠?￡óéóúêy×??ˉD??￠ò??à??D?ê??úí???é????ù±??Yμ?′?ê?￡??t???￠?óòμ?°??è????e?￥°?í???×÷?a?÷òaμ?í¨D?ê???￡?′óá???òa???toí??è?D??￠ò?êy×??ˉD?ê?′?′￠oí′?ê?￡?μ?×óéì???òí¨1yí????a?ò??ìá1?á??÷??·t??￡?í???ó?D??￠°2è??êìa±?μ???à′????òa?￡??×??????ú′|àí?üá|μ??ì?ùìá??￡?ì?±eê???×?í????à??ì???ê?μ?·￠?1￡?D??￠ò??-2????????Tóú??±?￡?Dí?àD??￠ê?í?D?í???oíêó?μ??ê?￡?Dèòaè??¤oí°?許￡?¤μ?éù??êy?Yò2??à′???à?￡′?ía￡??ú?üê?áìóò￡?è????é?üDèòa??ò?·ù×÷??μ?í?òt2??úò?·ùò?ê?×÷?·?D?￡?aD?ó|ó?Dè?ó?yê?êy×???ó???ê?òa?a??μ??êìa?￡
1.1 êy×?í?????ó?μ?????
êy×???ó??òμ?×ó??ó?oí′?í3????é?ó??￠μ???ó?ê?2?í?μ?á????????￡????ê?2??é??μ?￡????òê???ò???3yμ??￡êy×???ê?oíòòì?í?μ????ù·￠?1￡??÷??D?ê?μ??à??ì?êy×?×÷?·￡¨í????￠êó?μ?￠ò??μ￡?·×·×ò?í???D?ê?·￠±í￡???°?許￡?¤ê???Dèòa?è?D?a??μ??êìa?￡óéóúêy×???ó?ê??a??°?è¨×?óDD§μ?·?·¨￡?è???ò?3é?a?à??ì?D??￠°2è?áìóòμ?ò???èèμ?￡?ò2ê?D??￠òt2?áìóòμ?ò?????òa·??§?￡í¨1y?ú?-ê?êy?Y?D??è????üD??￠?a?a??ó?à′?yê???êy?Yμ??ùóDè¨?￡?a????è?μ???ò??éò?ê?ò?????×??￠±êê??￠í????￠DòáDo?￡????ò?a????ó?ò?°?2??é??￡??üó??-ê?í??????ü?áo?2￠òt2????D￡?2￠?é?-àúò?D?2????μ?-ê?êy?Yê1ó????μoíéìó????μμ?2ù×÷??±￡′???à′[3]?￡êy×???ó?￡¨Digital Watermark￡???ê?ê?í¨1yò??¨μ???·¨??ò?D?±ê??D?D??￠?±?ó??è?μ??à??ì??úèYμ±?D￡?μ?2?ó°?ì?-?úèYμ????μoíê1ó?￡?2￠?ò2??ü±?è?μ??a???μí3??2ì?ò×￠òaμ?￡???óDí¨1yרó?μ??ì2a?÷?ò???á?÷2??üìáè?[4]?￡???Dμ???ó?D??￠?éò?ê?×÷??μ?DòáDo??￠1???±ê???￠óDì?êaòaò?μ???±?μè￡??éó?à′ê?±e???t?￠í????òò?à????·μ?à′?′?￠°?±??￠?-×÷???￠óμóD???￠·￠DDè??￠o?·¨ê1ó?è???êy×?2ú?·μ?óμóDè¨?￡ó??ó?ü??ê?2?í?￡?êy×???ó???ê?2￠2??ü×è?1μá°????ˉμ?·￠éú￡?μ??ü?éò??D±e???óê?·?êüμ?±￡?¤￡??àêó±?±￡?¤êy?Yμ?′?2￥?￠???±??±eoí·?·¨??±′?￠?a??°?è¨?à·×2￠?a·¨í￥ìá1??¤?Y?￡
?yòò?a??ó?ê?à?ó?á?í????Dμ????ú??éù￡??ùò?3ìDò?￠ASCII??±??￠CADμ??òá?êy?Y???tóéóú??óD???ú??éù??2??ü?ó??ó??￡??è???à′?μ￡?è?1?ê??ú??μ-μ?í?????óò?ú×?á?DT??￡?ê?oüèYò×2ì??μ??￡???ú??°??ú×÷ò?μ?DT???íoü??·￠???￡?ù????°?￡??íê?°üo????úD?oí??òaD?μ???óò?￡?D??±í?÷?￡è?o?êy×?í?????°üo????úD?êy?Y￡?3??a???ú??éù?￡?aD????úD?êy?Y??óD?-1y?????úì?êa′|àí2??ü·￠??￡?1?2ì??ê??D??2?μ??ò???D??μ?á?μ?ê??μ2???3t?￡??ó??íê?à?ó?á??aò?ì?μ?￡??úêy×?í???μ?1a??D??￠?ú×÷ò?D?DT??￡?3é?a?óò?D??°??D??ü?±?￡?ú??μ-??óò?ú?a???°?ü?±?óμ?éùò?μ?￡??ú???ú???ú?óμ??àò?μ?￡?μ?1?2ì???T·¨2ì???￡???ù±??-àíê?à?ó?á?í???μ????ú??éù?￡
1.2 êy×???ó?μ?òaò??°ó|ó?3?o?
1.2.1 êy×???ó?μ?òaò?

1?￠?úwwwé?í????￠?????￠ò?ê??·?éò??μ?ììì??μ?￡?μ?ê?oüéù??μ?óD1?à′?′oí×÷??μ?D??￠?￡′óí?é?????μ?ò?ê??·oü??μ?μ?°?許￡?¤￡?è?1??úí???é??óóDêy×??ˉ??ó??í?éò??aμà×÷??ê??-￡?è?o?2é·?￡?
2?￠′óêμó????è?′￡???óúóD?ó??ó?μ?í???￡?ê1ó????éò??D???aò?2?á?ê?·?ò??a·?ê1ó??aμà?üμ?êêó?·??§ò??° è?o???μ?o?·¨μ???±′￡?
3?￠è?1??ü?óé?êy×??ˉ??ó?￡??ù?Y???Dμ?D??￠óD?úóú??í?????DD1à??￡??ú3????ù?′oí?à

μú1?? D÷?? 1
1.2 êy×???ó?μ?òaò??°ó|ó?3?o? 2
1.3 êy×?í?????ó?μ?ê???oí·?·¨ 3
1.4 ±???ìa2éó?μ?·?·¨ 5
μú2?? êy×???ó?μ?êy?§?￡Dí?ééü 5
2.1 êy?§?-àí 5
2.2 è?o??ó?üò??°?@@× 7
2.3 1¤3ìêμ???-àí 10
μú3?? MATLAB?úí???′|àí?Dμ?ó|ó? 12
3.1 MATLABó|ó?μ?1?·oD? 12
3.2 MATLAB?úí???′|àí?Dμ?ó|ó? 12
3.3 DCT?￠DòáD2úéú?úMATLAB?Dμ?êμ?? 14
3.4 ?úMATLAB?Dμ?êμ??2?è??￠?ì2a??·¨ 16
μú4?? êμ?é?á1?ó??á?? 19
4.1 ??ó?μ?1￥?÷DD?a 19
4.2 êμ?é?á1? 20
?á??ó??1í? 27
2??????× 28
????A 29
????B 34

[1] ??±?￡??üá??ù￡?íò?¨?°￡??￥éú??. á????ùóúDCT±???μ?êy×???ó???·¨·???[J]. 1ú·à????′ó?§?§±¨￡?1999?ê06?ú
[2] ·?μ???￡?à??óá?￡?????à?. ò???DCT±???óòμ?í??óêy×???ó???ê?[J]. ?????úó|ó??D??￡?2002?ê11?ú
[3] ???aDü. 3e??áá. êy×???ó?D?μà?￡Díμ??ì?ù1à??[J]. μ??·ó??μí3?§±¨￡?2002?ê02?ú
[4] ????èa. ????. ?ùóúà?é￠óà?ò±???í??ó??ó???·¨μ??D??[J]. ?????ú1¤3ìó?ó|ó? ￡?2003?ê13?ú
[5] è?1ú±|￡???è?￡???óà??￡??????ü￡???oé. ò???????μ?êy×?í???à??μ??ó???ê?[J]. D??￠ó?μ?×ó1¤3ì ￡?2003?ê02??
[6] Díoìé?. ?ùóú±???óòμ?êy×???ó???ê?[J]. ?????ú1¤3ìó????§￡?2004?ê01?ú
[7] 1è′ó??￡???ó?￡?°×ó￠2ê. êy×?í??ó°?è¨μ???ó?±￡?¤[J]. רìa,?￠Díμ???ó|ó?￡?1998?ê