A cmos aps image sensor with watermarking

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dc.contributor.advisorYadid-Pecht, Orly
dc.contributor.advisorJullien, Graham
dc.contributor.authorNelson, Graham
dc.date.accessioned2017-12-18T21:18:21Z
dc.date.available2017-12-18T21:18:21Z
dc.date.issued2007
dc.descriptionBibliography: p. 71-77en
dc.description.abstractA novel idea is proposed for integrating digital watermarking capabilities into com­plementary metal-oxide semiconductor (CMOS) image sensors. The background of watermarking and previous hardware implementation is given and a simple digital watermarking scheme, ideal for implementation in a CMOS image sensor, is outlined. The watermarking algorithm was analyzed in terms of the effect on image quality, the statistics for successful watermark detection, and its susceptibility to attack. It was found that image quality could be high if less than three watermark bits were added to an image. A trend was also discovered that if the inequality 28 -/'MN 2 2048 is satisfied, where M and N are the dimensions of the image, in pixels, and 8 is the number of bits used for the watermark values, successful detection statistics will be obtained. It was also demonstrated that removing a watermark placed with this particular algorithm is relatively easy using low-pass filters; however, extracting the watermark from a watermarked image for insertion into an unauthorized image was accomplished and represents a greater threat. A device prototype was designed and fabricated and the results are discussed. The design of key components is highlighted in the context of the larger system. The operation of the chip in terms of signals and timing is given. Successful fabrication turned out to be an elusive goal and the difficulties encountered provide valuable information to the next phase of the project, recently submitted for fabrication. Finally, the noise data show conclusively that fixed pattern noise (FP ) is a useful source for key generation. It allows for the unique identification of sensors through the key generation process; however, small changes in the input data can affect the key, if the length of the key is large enough. Keys should be stored in non-volatile memory on the image sensor in order to speed up the image capture process. In summary, a complete system from sensor to key generation to embedding and detection of digital watermarks has been created, and can help provide a much needed boost to image veracity in target applications.
dc.format.extentxiv, 122 leaves : ill. ; 30 cm.en
dc.identifier.citationNelson, G. (2007). A cmos aps image sensor with watermarking (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/932en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/932
dc.identifier.urihttp://hdl.handle.net/1880/101933
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.titleA cmos aps image sensor with watermarking
dc.typemaster thesis
thesis.degree.disciplineElectrical and Computer Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 1740 520492257
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
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