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Dissertations / Theses on the topic 'Digital watermarking'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Bounkong, Stephane. "Digital image watermarking." Thesis, Aston University, 2004. http://publications.aston.ac.uk/13264/.

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In recent years, interest in digital watermarking has grown significantly. Indeed, the use of digital watermarking techniques is seen as a promising mean to protect intellectual property rights of digital data and to ensure the authentication of digital data. Thus, a significant research effort has been devoted to the study of practical watermarking systems, in particular for digital images. In this thesis, a practical and principled approach to the problem is adopted. Several aspects of practical watermarking schemes are investigated. First, a power constaint formulation of the problem is pre

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2

Yip, Shu Kei. "Digital watermarking and data hiding /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?ECED%202006%20YIP.

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3

Loo, Patrick. "Digital watermarking using complex wavelets." Thesis, University of Cambridge, 2002. https://www.repository.cam.ac.uk/handle/1810/251833.

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4

Tu, Ronghui. "Semi-fragile digital audio watermarking." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26432.

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The digital information has brought many changes to our life in recent decades. With the rapid growth of digital information, a lot of new techniques are coming into being. Digital watermarking is one of them. This thesis presents a semi-fragile audio watermarking scheme which can be applied to content authentication or copyright verification. The major contribution of this thesis is the introduction and implementation of a unified copyright verification and content authentication algorithm for audio signal. In our approach, we embed the watermark in the discrete wavelet domain of an audio by

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5

Zheng, Dong. "RST invariant digital image watermarking." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26554.

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Digital image watermarking has been proposed as a method to ensure the copyright protection and credibility of images by means of embedding a known piece of digital data into host images. To be useful, a good watermarking scheme should be robust against all known attacks to a certain degree based on requirements. In this thesis, we propose a novel digital image watermarking scheme that is invariant to rotation, scaling, and translation (RST). We embed watermark in the log-polar mapping (LPM) of the Fourier magnitude spectrum of original image, and use the phase correlation between the LPM of t

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6

Li, Richard Yuk Ming. "Digital watermarking and data hiding /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20LIR.

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7

Zain, Jasni Mohamad. "Digital watermarking in medical images." Thesis, Brunel University, 2005. http://bura.brunel.ac.uk/handle/2438/4978.

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This thesis addresses authenticity and integrity of medical images using watermarking. Hospital Information Systems (HIS), Radiology Information Systems (RIS) and Picture Archiving and Communication Systems (P ACS) now form the information infrastructure for today's healthcare as these provide new ways to store, access and distribute medical data that also involve some security risk. Watermarking can be seen as an additional tool for security measures. As the medical tradition is very strict with the quality of biomedical images, the watermarking method must be reversible or if not, region of

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8

Ghouti, L. "Multiresolution-based digital multimedia watermarking." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426701.

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9

PACITTI, MARCOS DE CASTRO. "CODING INFLUENCE ON DIGITAL WATERMARKING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=10164@1.

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COMANDO DA AERONÁUTICA<br>Esta tese pode ser segmentada em duas partes distintas, porém complementares. A primeira parte trata do problema que tange ao desenvolvimento da maioria dos sistemas de marcação d água digital: a necessidade de primeiramente selecionar a técnica de modulação não codificada que fará parte de uma arquitetura codificada. Assim, para proceder adequada seleção, os limitantes de desempenho das técnicas não codificadas são ferramentas importantes para otimização de sistemas codificados, objetivando operação próximo à capacidade. Esta parte da tese introduz um novo

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10

Lock, Andrew. "Digital watermarking of precision imagery." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=214152.

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There has been a growing interest in reversible watermarking of medical images re- cently for security reasons. Typically, humans are assumed to be the end user of watermarked images, however in many cases machine vision processes may be addi- tional consumers. Therefore, any watermarking performed on these images must be imperceptible to not only human users, but also these machine vision processes. The objective of this thesis is to understand the extent to which reversible water- marking affects the ability of computer vision algorithms to perform correctly. We address both the effect on pr

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11

Ahmed, Kamal Ali. "Digital watermarking of still images." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/digital-watermarking-of-still-images(0dc4b146-3d97-458f-9506-8c67bc3a155b).html.

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This thesis presents novel research work on copyright protection of grey scale and colour digital images. New blind frequency domain watermarking algorithms using one dimensional and two dimensional Walsh coding were developed. Handwritten signatures and mobile phone numbers were used in this project as watermarks. In this research eight algorithms were developed based on the DCT using 1D and 2D Walsh coding. These algorithms used the low frequency coefficients of the 8 × 8 DCT blocks for embedding. A shuffle process was used in the watermarking algorithms to increase the robustness against th

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Keskinarkaus, A. (Anja). "Digital watermarking techniques for printed images." Doctoral thesis, Oulun yliopisto, 2013. http://urn.fi/urn:isbn:9789526200583.

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Abstract During the last few decades, digital watermarking techniques have gained a lot of interest. Such techniques enable hiding imperceptible information to images; information which can be extracted later from those images. As a result, digital watermarking techniques have many interesting applications for example in Internet distribution. Contents such as images are today manipulated mainly in digital form; thus, traditionally, the focus of watermarking research has been the digital domain. However, a vast amount of images will still appear in some physical format such as in books, poster

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13

Wang, Sha. "Video quality measurement using digital watermarking." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/27076.

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A 3-level DWT (Discrete Wavelet Transform) based objective video quality measurement method is proposed based on semi-fragile digital watermarking. The watermark is embedded into the luminance components of the Intra frames of an MPEG-2 video stream, which can be treated as images. The degradation of the watermark is used to estimate the degradation of the cover work. A quantization method is used to embed the watermark. In the watermark embedding process, 10 quantization parameters are assigned to the 10 DWT decomposed blocks which are obtained by applying 3-level DWT to the target image. And

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14

Cai, Libin. "Speech quality evaluation using digital watermarking." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27115.

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Speech quality evaluation is a very important research topic. The Mean Opinion Score (MOS) is reliable but the listening test is very expensive, time consuming, and even impractical for some applications. Objective quality evaluation methods require either the original speech or a complicated computation model, which makes some applications of quality evaluation impossible. Different from the perceptual model used by the Perceptual Evaluation of Speech Quality (PESQ), in this thesis, we propose to use digital audio watermarking to evaluate the quality of speech. Based on quantization, watermar

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15

Guo, Huiping. "Digital image watermarking for ownership verification." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/29018.

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The development of the Internet has greatly contributed to the expanded use of digital media, for example, images, audio, video, VRML objects. These media can be duplicated unlimitedly without any quality loss and can also be easily distributed and tempered. This presents problems of digital media security, such as copyright protection and authentication, which creates a pressing need for digital media protection schemes. A new emerging technology, digital watermarking, protects digital media by embedding a robust signal directly into the media, thus providing a promising way to protect the di

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Gupta, Gaurav. "Robust digital watermarking of multimedia objects." Phd thesis, Australia : Macquarie University, 2008. http://hdl.handle.net/1959.14/28597.

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Thesis (PhD)--Macquarie University, Division of Information and Communication Sciences, Department of Computing, 2008.<br>Bibliography: p. 144-153.<br>Introduction -- Background -- Overview of watermarking -- Natural language watermarking -- Software watermarking -- Semi-blind and reversible database watermarking -- Blind and reversible database watermarking -- Conclusion and future research -- Bibliography.<br>Digital watermarking has generated significant research and commercial interest in the past decade. The primary factors contributing to this surge are widespread use of the Internet wit

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17

Gordy, James D. "Performance evaluation of digital watermarking algorithms." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0015/MQ49675.pdf.

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18

de, Souza Savita. "Digital watermarking and novel security devices." Thesis, De Montfort University, 2003. http://hdl.handle.net/2086/5847.

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This research is in the field of document security and the investigation of existing security devices. Security documents can be of two types; those that have commercial value, namely currency, articles of value and those that have legal value, namely, passports, identification cards etc. It is of vital importance in today's world, where fraud and counterfeiting are the order of the day, to protect any article or document of aesthetic importance and value. After the tragic events of September 11th 2001, security and the lack of security in every sense of the word is a much talked and researche

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19

Nasir, Ibrahim A. "Digital Watermarking of Images towards Content Protection." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4432.

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With the rapid growth of the internet and digital media techniques over the last decade, multimedia data such as images, video and audio can easily be copied, altered and distributed over the internet without any loss in quality. Therefore, protection of ownership of multimedia data has become a very significant and challenging issue. Three novel image watermarking algorithms have been designed and implemented for copyright protection. The first proposed algorithm is based on embedding multiple watermarks in the blue channel of colour images to achieve more robustness against attacks. The seco

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Nasir, Ibrahim Alsonosi. "Digital watermarking of images towards content protection." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4432.

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With the rapid growth of the internet and digital media techniques over the last decade, multimedia data such as images, video and audio can easily be copied, altered and distributed over the internet without any loss in quality. Therefore, protection of ownership of multimedia data has become a very significant and challenging issue. Three novel image watermarking algorithms have been designed and implemented for copyright protection. The first proposed algorithm is based on embedding multiple watermarks in the blue channel of colour images to achieve more robustness against attacks. The seco

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21

Yuan, Xiao Chen. "Robust and geometric invariant digital image watermarking." Thesis, University of Macau, 2010. http://umaclib3.umac.mo/record=b2182875.

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Abdulaziz, Nidhal Kadhim 1958. "Digital watermarking and data hiding in multimedia." Monash University, Dept. of Electrical and Computer Systems Engineering, 2001. http://arrow.monash.edu.au/hdl/1959.1/8047.

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23

Curreem, Hanif. "A watermarking protocol for digital contents distribution /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?COMP%202002%20CURREE.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2002.<br>Includes bibliographical references (leaves 65-68). Also available in electronic version. Access restricted to campus users.

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Jiang, Zi Yu. "Digital watermarking methods with robustness and reversibility." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3869193.

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Wang, Sha. "Digital Watermarking Based Image and Video Quality Evaluation." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23988.

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Image and video quality evaluation is very important. In applications involving signal transmission, the Reduced- or No-Reference quality metrics are generally more practical than the Full-Reference metrics. Digital watermarking based quality evaluation emerges as a potential Reduced- or No-Reference quality metric, which estimates signal quality by assessing the degradation of the embedded watermark. Since the watermark contains a small amount of information compared to the cover signal, performing accurate signal quality evaluation is a challenging task. Meanwhile, the watermarking process c

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Terzija, Nataša. "Robust digital image watermarking algorithms for copyright protection." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982382553.

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27

Chao, Hoi Ka. "Application of digital watermarking technology in Java programs." Thesis, University of Macau, 2005. http://umaclib3.umac.mo/record=b1445900.

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Okman, Osman Erman. "Quantization Index Modulation Based Watermarking Using Digital Holography." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607506/index.pdf.

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The multimedia watermarking techniques are evolved very quickly in the last years with the increase in the use of internet. The evolution of the internet makes the copyright issues very important and many different approaches are appeared to protect the digital content. On the other hand, holography is the method to store the 3-D information of an object but it is very applicable to use as a watermark because of the nature of the holographic data. The 3-D object can be reconstructed from the hologram even if the hologram is cropped or occluded. However, watermarking of an image with a hologram

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Thompson, A. I. "Digital watermarking for multimedia security using complex wavelets." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492336.

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Digital data hiding has gained popularity in recent years as a way of settling intellectual property rights disputes, the ease with which digital media can be copied and distributed has led to a need for a method of identifying the original owner ofthe media. Data hiding allows for the embedding of information in a host signal that can later be extracted as proof of ownership or for some other purpose. Robustness, imperceptibility and capacity are the three conflicting attributes of data hiding systems. This thesis is dedicated to the establishment of data hiding algorithms that will achieve n

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Liu, Yan. "Rotation, scaling and translation invariant digital image watermarking." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26699.

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Many digital image watermarking schemes have been proposed and are robust to common signal processing, such as compression and filtering. Geometric distortions, such as rotation, scaling, and translation (RST), are considered the most challenging attacks. This thesis is on RST invariant digital image watermarking. In this thesis, we introduce the fundamental theories and techniques necessary for RST invariant digital image watermarking, and briefly review the existing RST invariant image watermarking schemes. Then, we propose an image rectification scheme for RST invariant digital image waterm

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Qi, Huiyan. "Human visual system based adaptive digital image watermarking." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27287.

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It is known that the fidelity of the image is inversely proportional to the robustness of the watermark. Therefore, there should be the trade off between fidelity for robustness and vise versa. Based on the new spatial masking we explored in this thesis, a new adaptive digital image watermarking method is proposed. It keeps the invisibility of the watermark and maintains its robustness at the same time. The new spatial masking is built according to the image features such as flat areas with big brightness or darkness, edges, and regions with high activities. With the same watermarking energy,

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Tai, Yuan-Hsiang, and 戴元翔. "Digital Audio Watermarking Techniques." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/88982778400158946239.

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Ya-Wen, Lu, and 呂雅文. "Digital Audio Watermarking and." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/64529496671049267594.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>91<br>Abstract In the last few years, the world has evolved into a multimedia age with booming Internet connectivity. It has become very easy to obtain and download digital data. However, easy access and duplication have posed serious problem of piracy in media distribution. The watermarking techniques are researched and developed to protect the ownership of owner and the author. In addition, the amount of bandwidth for multimedia applications and the dimensions of digital have been continuously growing, so that retrieval of information is becoming th

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Jun-Horng, Chen. "Quantization-Based Digital Image Watermarking." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2106200511424700.

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Xin, Yongqing. "Robust digital watermarking in images." 2006. http://hdl.handle.net/1993/20339.

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Chang, Li-Chun, and 張立鈞. "Digital watermarking of audio signals." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/88684654504954397665.

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碩士<br>國立中正大學<br>電機工程研究所<br>88<br>Past few years multimedia have chance to advance, especially in MPEG-1 Layer 3 (MP3)─a standard of new generation in audio compression. Its compression rate is 1：10 ~1：12. This rate might economize a lot of saving spaces and might be more convenient for spreading on Internet. Therefore, the widespread of MP3 let people can search from Internet easily. But, at the same time, this kind of convenience let illegal people or pirate, through digital media or Internet, copy the original works without paying. These problems need to resolve urgently, so to develop

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Peng, Chi-Hsiang, and 彭啟翔. "Digital Watermarking Using Wavelet Transforms." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/96403732515940947467.

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碩士<br>國立清華大學<br>資訊工程學系<br>98<br>The problem of copyright protection and ownership identification is attention-getting because the Internet applications and consumer electronics products have been rapidly developed. The watermarking system can partially solve this problem. In this thesis, experiments of a watermarking system using 4 different discrete wavelet transforms were implemented. An authorized watermark, sampled from a standard normal distribution, is embedded into the wavelet coefficients of high-low and low-high subbands at level 3 of a 3-scale discrete wavelet transform. Four popular

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Chen, Jun-Horng, and 陳俊宏. "Quantization-Based Digital Image Watermarking." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/27388002432253866508.

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博士<br>國立臺灣大學<br>電機工程學研究所<br>93<br>The computer networks and mass storage devices make the exchange and spread of digital multimedia content more easy than before, yet challenge the copyright protection and obstruct the development of creative work. In addition, many fantastic software can tamper the digital content imperceptibly, and thus raise the difficulty of authentication. Consequently, watermarking techniques are extensively discussed with the aim to address these issues and provide the DRM (Digital Rights Management) with a firm basis. This dissertation presents a preliminary discussio

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Chen, Yu-hau, and 陳昱豪. "Digital Image and Video Watermarking." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/30447801910040935770.

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Hsu, Yu-Feng, and 許宇鳳. "Digital Image and Audio Watermarking." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/25753520993393753461.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>89<br>The world has evolved into a multimedia age with booming internet connectivity, which enables us to carry and distribute digital data without any difficulty. However, this convenience also facilitates illegal uses of copyrighted data. To prevent pirating and deal with the intellectual property problem, the watermarking techniques are researched and developed to provide the author and owner with another method to declare their ownership. Two watermarking schemes on color images and digital audio data are proposed in this thesis. For color image water

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Liao, Yi-Chu, and 廖一舉. "A Study On Digital Watermarking." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/60186140794749196314.

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碩士<br>國立清華大學<br>資訊工程學系<br>89<br>Digital watermarking technique has been proposed for years to actualize copyright protection for digital data. Digital data can refer to audio, image, and video. In this thesis, we discuss only embedding watermarks into images. Previous works have been used to look for the position to place the watermarks based on mathematical methods. Instead of proposing a new embedding method, this thesis proposes a watermark structure. A good watermark structure can also strengthen the robustness of a watermark. Some researchers embedded a sequence of r

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Chang, Kai-Hsiang, and 張凱翔. "Digital Watermarking with Progressive Detection." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/64180520450139245904.

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碩士<br>國立中山大學<br>資訊工程學系研究所<br>88<br>In this thesis, we proposed two frequency-based watermarking algorithms. One is DCT-based method. Embedding watermark in the multi-areas and multi- frequency bands to ensure we can get a less distorted watermark sequence under unintentional circumstance. The other is DWT-based method. The parent-children relationship and the feature of bit-plane coding in the EZW algorithm are exploited to embed watermark. It makes that we can know the watermark exist or not in the progressive transmission system. The experimental results show that the proposed methods both c

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Chang, Hen-Ming, and 張恆民. "A Study on Digital Watermarking." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/60271031793102385339.

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碩士<br>國立交通大學<br>資訊科學系<br>87<br>The development of computers and Internet has exploded in the last few years, and the digital data is used popularly. The digital images are distributed and duplicated easily through WWW, thus the protection of the intellectual property rights of digital images becomes an important issue. The digital watermarking technology provides a good solution for this issue. There are two kinds of digital watermarks: visible and invisible. In this paper, the visible watermarking methods on digital gray-scale or color images and the invisible watermarking methods on digital

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Pu, Yu-Chi, and 蒲鈺琪. "Digital Watermarking on Vector Graphics." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/64904033647512912007.

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博士<br>國立高雄第一科技大學<br>工程科技研究所<br>98<br>Digital watermarking techniques provide a scheme for the copyright protection of multimedia data. In recent few decades, most digital watermarking and steganographic research paid much attention to images, audio or video, which are raster (or regular) data, but little research addressed irregular vector graphics data specified geometrically, by vertices, polygonal lines or high-order curves. Vector graphic images, applicable for scalable vector graphics (SVG) format or geographical information systems (GIS), are popular on the WWW, and provide the advantage

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Wei, Lee Jia, and 李家維. "Applied Digital Watermarking System on Digital Audio Signals." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/25402823015561461414.

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碩士<br>國立清華大學<br>資訊工程學系<br>91<br>In this thesis, we propose a digital watermarking scheme applied to digital audio signals to protect copyright. This watermark can be a 2D logo, a barcode image, or other information about the music. To satisfied two main features: inaudibility and robustness, we works on frequency domain. In this system, we do block DCT to original digital audio signal and embed watermarks into the coefficients. In order to get the embedded watermark in the correct position, we add a small signal in front of blocks for synchronization. We test this scheme under commo

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Zhu, Hai Ling. "Digital image watermarking for copyright protection." Thesis, 2012. http://hdl.handle.net/10210/6674.

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M.Ing.<br>The objective of this research is to develop a new robust and efficient adaptive watermarking method for JPEG compressed images, in which the watermark can survive even if the watermarked image undergoes manipulations. In this thesis, we present two image watermarking methods: one based on the spatial domain and the other on the DCT-based domain. Both approaches, which embed meaningful information into images for copyright protection, are blind watermarking schemes. To illustrate the robustness and performance enhancement derived from Error Correction Codes (ECC) when applied to wate

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Elayan, Abdallah Muneer. "Robust Watermarking Schemes for Digital Images." Thesis, 2013. http://spectrum.library.concordia.ca/978203/1/Abdallah_Elayan_MSc_S2014.pdf.

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With the rapid development of multimedia and the widespread distribution of digital data over the internet networks, it has become easy to obtain the intellectual properties. Consequently, the multimedia owners need more than ever before to protect their data and to prevent their unauthorized use. Digital watermarking has been proposed as an effective method for copyright protection and an unauthorized manipulation of the multimedia. Watermarking refers to the process of embedding an identification code or some other information called watermark into digital multimedia without affecting the vi

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Chung, Kuo-Chen, and 鐘國禎. "Robust Digital Watermarking Technique of MP3." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/4v3t5b.

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碩士<br>國立成功大學<br>電機工程學系<br>89<br>Nowadays the multimedia technology in distributed environments becomes realistic and the multimedia copyright protection issue becomes more and more important. Various digital watermarking techniques have been proposed in recent years to protect the copyright of multimedia data, and they also have been used on digital audio signals. But, the safety and robustness issues of watermarking techniques are challenged in applying these techniques to MPEG Audio bit streams, especially the MPEG-1 Audio Layer 3 (MP3) encoder. In this paper, we propose a waterm

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Gilani, Syed Asif Mahmood. "Digital image watermarking for copyright protection." Thesis, 2002. http://nemertes.lis.upatras.gr/jspui/handle/10889/3469.

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Wei-Tsung, Lee, and 李尉聰. "Digital TV Measurement, Analysis and Watermarking." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/83604956569654810356.

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碩士<br>國立交通大學<br>電子工程系<br>89<br>Digital TV (DTV) not only provides a better quality for video and audio services, it can also be used to carry other types of digital data. It will be one of the most important vehicles taking us to the information highway in the 21 century. However, it is different from the conventional TV in many aspects. In this thesis, we focus on the transmission characteristics of DTV and the content security issue. There are three parts in this thesis: (1) field test of ATSC DTV system for adjacent channel interference, (2) comparison of ATSC and DVB-T systems based on sev

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