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dc.contributor.advisorPieper, Ron J.
dc.contributor.advisorCristi, Roberto
dc.contributor.authorRetsas, Ioannis.
dc.date.accessioned2012-03-14T17:47:33Z
dc.date.available2012-03-14T17:47:33Z
dc.date.issued2002-03
dc.identifier.urihttp://hdl.handle.net/10945/6032
dc.description.abstractDigital watermarking is a highly evolving field, which involves the embedding of a certain kind of information under a digital object (image, video, audio) for the purpose of copyright protection. Both the image and the watermark are most frequently translated into a transform domain where the embedding takes place. The selection of both the transform domain and the particular algorithm that is used for the embedding of the watermark, depend heavily on the application. One of the most widely used transform domains for watermarking of still digital images is the Discrete Cosine Transform domain. The reason is that the Discrete Cosine Transform is a part of the JPEG standard, which in turn is widely used for storage of digital images. In our research we propose a unique methodfor DCT-based image watermarking. In an effort to achieve robustness to cropping and JPEG compression wehave developed an algorithm for rating the 8.8 blocks of the image DCT coefficients taking into account theirembedding capacity and their spatial location within the image. Our experiments show that the proposed schemeoffers adequate transparency, and works exceptionally well against cropping while at the same time maintainssufficient robustness to JPEG compression.en_US
dc.description.urihttp://archive.org/details/adctbasedimagewa109456032
dc.format.extentxviii, 117 p. : ill. (some col.) ;en_US
dc.publisherMonterey California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.subject.lcshImage processingen_US
dc.subject.lcshDigital techniquesen_US
dc.titleA DCT-based image watermarking algorithm robust to cropping and compressionen_US
dc.typeThesisen_US
dc.contributor.secondreaderJenn, David C.
dc.contributor.departmentElectrical Engineering
dc.contributor.departmentSystems Engineering (SE)
dc.subject.authorDigital Image Watermarkingen_US
dc.subject.authorJPEG Compressionen_US
dc.subject.authorDiscrete Cosine Transformen_US
dc.description.serviceLieutenant, Hellenic Navyen_US
etd.thesisdegree.nameM.S. in Electrical Engineeringen_US
etd.thesisdegree.nameM.S. in Systems Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineElectrical Engineering and Systems Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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