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Showing 1 to 20 of 51 for “"Watermark"”.
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Watermark redundancy using sudoku
In today’s world, designer of a watermarking system had to constantly faced with determined attacks to remove copyright information from a watermarked cover image. Due to these attacks, a watermark could be seriously corrupted and not detectable anymore or the watermark could be so noisy that it’s …
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Paper-Based Watermark Extraction with Image Processing
… and graphical representation of paper-based watermark designs embedded in paper texture. There is a growing need for this among librarians and antiquarians to aid with identification, wider accessibility, and providing a further level of document imaging for preservation. The proposed …
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A real-time audio transcoder with watermark images for content protection and quality of service monitoring
… (UMA) transcoding module along with a watermarking-based data-hiding module that provides copyright protection as well as data integrity, authenticity assurance, and QoS monitoring. The audio was first adapted to multiple clients' needs on the server side, watermarked, and then sent to …
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Digital Watermarking Based Image and Video Quality Evaluation
… 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 …
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A robust region-adaptive digital image watermarking system
Digital image watermarking techniques have drawn the attention of researchers and practitioners as a means of protecting copyright in digital images. The technique involves a subset of information-hiding technologies, which work by embedding information into a host image without perceptually …
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A dual-watermarking with QR code against cropping and resizing attack
Watermarking is a pattern of bits inserted into a digital image, audio or video file (digital file) that identifies the file’s ownership copyright information. It is one of the techniques to discourage illegal duplication of intellectual property. However, there is still a room for improvement for …
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A comparison of discrete cosine transform and discrete wavelet transform algorithm in watermarking against common attacks
Digital watermarking is a technique to embed additional data to digital images, audios and videos without affecting the quality of the original image. Watermark can be extracted for ownership verification or authentication. Currently, there is no comparison documented done between Discrete Cosine …
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Adaptive watermarking algorithms for MP3 compressed audio signals
… and various malicious attacks. Digital watermarking is a technology that allows users to embed some imperceptible data into digital contents such as image, movie and audio data. Once a watermark is embedded into the original MP3 signal, it can be used to identify the copyright holder in …
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Security of Watermarking Schemes Against Sensitivity Analysis Attacks
"This conclusion calls for a design framework for watermark detectors encompassing all the requirements on the detector. In order to build such framework, we model sensitivity analysis attacks as a general watermark estimation problem in which the adversary controls how informative the measurements …
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Design and analysis of Discrete Cosine Transform-based watermarking algorithms for digital images. Development and evaluation of blind Discrete Cosine Transform-based watermarking algorithms for copyright protection of digital images using handwritten signatures and mobile phone numbers.
… of blind discrete cosine transform-based watermarking algorithms for copyright protection of digital still images using handwritten signatures and mobile phone numbers. The new algorithms take into account the perceptual capacity of each low frequency coefficients inside the Discrete …
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Design and analysis of Discrete Cosine Transform-based watermarking algorithms for digital images. Development and evaluation of blind Discrete Cosine Transform-based watermarking algorithms for copyright protection of digital images using handwritten signatures and mobile phone numbers
… of blind discrete cosine transform-based watermarking algorithms for copyright protection of digital still images using handwritten signatures and mobile phone numbers. The new algorithms take into account the perceptual capacity of each low frequency coefficients inside the Discrete …
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Study of joint embedding and compression on JPEG compression scheme using multiple codebook data hiding
… correlation between the embedded and extracted watermark. The performance of data hiding rate against the embedding distortion is also studied and on the basis of which, an effort is made to reach an optimal tradeoff between the hiding rate and embedding distortion. On the basis of normalized …
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ROBUST WATERMARKING TECHNIQUES FOR SCALABLE CODED IMAGE AND VIDEO
… affect the content protection data, such as, watermarks and are considered as a potential watermark attack. In this thesis, research on robust watermarking techniques for scalable coded image and video, are proposed and the improvements in robustness against various content adaptation attacks, …
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Design, analysis, and implementation of effective network flow watermarking schemes
… an active form for traffic analysis, called flow watermarking. Flow watermarking works by first perturbing network flows and then observing network flows, looking for the specific perturbation patterns in order to link flows. This reduces the computational overhead to O(n) (from O(mn) for …
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Timing channels in traffic analysis
… stenographic channel arising in network flow watermarking, a technique with applications in attacking low-latency anonymous networks and detecting stepping stones. By injecting an ``invisible"" timing pattern (namely the watermark) in a packet flow, one can stealthily track the path of the …
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RST invariant digital image watermarking
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 …
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Digital Watermarking for Depth-Image-Based Rendering 3D Images and Its Application to Quality Evaluation
… essential concern. As a consequence, the digital watermarking for 3D image and video is attracting considerable attention. The depth-image-based rendering (DIBR) technique has been playing a critical role in 3D contents representation because of its numerous advantages. A good digital watermarking …
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Graph-based decoders and divergence-rate estimators for data-hiding problems
… arise within the context of multimedia blind watermark decoding and timing channels steganalysis. The central problem considered, loosely speaking, is that of implementing optimal (or near-optimal) strategies at the receiver, which is typically tasked to perform reliable decoding or detection, …
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A robust digital image watermarking using repetition codes against common attacks
Digital watermarking is hiding the information inside a digital media to protect for such documents against malicious intentions to change such documents or even claim the rights of such documents. Currently the capability of repetition codes on various attacks in not sufficiently studied. In this …
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Multimedia Security and Copyright Protection
… for MPEG video streams. We introduced a watermark construction algorithm which applies a standard encryption function, such as DES, to the original multimedia data, and we have proved that this scheme is non-invertible and is successful against the ""multiple claims of ownership"" attack. …
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