基于可变形多分辨率变换的抗几何攻击鲁棒水印算法研究

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1、中山大学硕士学位论文基于可变形多分辨率变换的抗几何攻击鲁棒水印算法研究姓名：黄晓霞申请学位级别：硕士专业：通信与信息系统指导教师：倪江群20100603中山大学硕士学位论文像中检测出水印信息。此外，算法中通过应用SPT域HMM模型更加合理地描述了图像在SPT变换域的系数分布及能量关系，从而提高水印检测器的性能，实验证明该水印算法能够有效抵抗几何攻击、一般信号处理攻击及联合攻击，具有良好的鲁棒性。关键词：鲁棒水印、抗几何攻击、可变形多分辨率变换、可缩放滤波器U中山大学硕士学位论文AGeometricallyInvariantRobustImageWaterm

2、arkingAlgorithmBasedonDeformableMulti—scaleTransformMajor：CommunicationandInformationSystemName：HuangXiaoxiaSupervisor：Pr0￡NiJiangqtmAbstractAsamethodofdigitalmediacopyrightprotectionandsupervision，digitalwatermarkinghasahugepotentialvalueincommercialapplication．Inthepasttwodecade

3、s,thoughtheeffortsoftheacademiaandindustry,researchesondigitalwatermarkinghavemadeagreatprogress．However,therobustnessagainstgeometricattacksoftheexistingdigitalwatermarkingalgorithmsstillfailtomeettheexpectedneedsandthushowtoresistinggeometricattackseffectivelyhasbecomeoneofthemo

4、stchallengingissuesintoday’Sresearchonrobustimagewatermarkingalgorithm．Inthispaper,weproposeatransform，namedDeformableMulti—scaleTransform,诵mshiftinvarianceandjointshiftabilityinorientationandscale，andbased011thepropertiesofDMSTwederivetheprinciplesforthesynchronizationoftranslati

5、on，rotationandscalingandfl】lrtherapplythemtodevelopaflewrobustimagewatermarkingalgorithmthatisresilienttogeometricalattacks．DMSTisanasymmetrictransform、析tllitsDMSTanalysisfiltersobtainedbyfactorizingthesteerableanalysisfiltersinSteerablePyramidTransform(SPT)．Accordingtothewaysofco

6、nstructingthesteerableanalysisfilters，theDMSTanalysisfiltersarealsoconstructedintwoways，oneinthespatialdomain,viasingularvaluedecomposition(SVD)，andtheotherintheFourierdomain，viatheframeworkofshiftabilityandtheconstraintsofreconstructingthefilters．III中山大学硕士学位论文Basedontheproperties

7、ofDMST,weprovetheprinciplesforthesynchronizationoftranslation，rotationandscalingandfurtherapplythemtoproposeanewrobustimagewatermarkingalgorithmresilienttogeometricalattacks．ThealgorithmachievessynchronizationbyinsertingatemplatetoestimatetheparametersofgeometricdistortionviatheDM

8、STanalysisfilters，andthenusesthep