A Novel Multibit Watermarking Scheme Combining Spread Spectrum and Quantization

2006 ◽  
pp. 111-122
Author(s):  
Xinshan Zhu ◽  
Zhi Tang ◽  
Liesen Yang
Keyword(s):  
Spread Spectrum ◽  
Watermarking Scheme

Watermarking Techniques for DRM Applications

2009 ◽  
pp. 71-100
Author(s):  
Alessandro Piva ◽  
Roberto Caldelli ◽  
Alessia De Rosa ◽  
Mauro Barni ◽  
Vito Cappellini
Keyword(s):  
Digital Watermarking ◽  
Digital Image ◽  
Spread Spectrum ◽  
Image Watermarking ◽  
Mathematical Formulation ◽  
Multimedia Content ◽  
Practical Implementation ◽  
Digital Image Watermarking ◽  
Spread Spectrum Watermarking ◽  
Watermarking Scheme

The need to safeguard the property rights of multimedia content from unauthorized copying and the possibility to determine the true owners of the asset can be faced by resorting to efficient digital watermarking systems. This chapter presents a mathematical formulation to define a digital watermarking system and describes the general requirements to be satisfied, with more emphasis given to the aspects of security, robustness, and imperceptibility. After this general discussion, the two main classes of digital watermarking schemes, namely the spread-spectrum watermarking and the side-informed watermarking are explained by highlighting their main advantages and drawbacks. This analysis is completed by the description of a practical implementation of a digital image watermarking scheme. Finally, the use of watermarking systems in the framework of a DRM is deeply analyzed.

Multimedia Copyright Protection

2011 ◽  
pp. 435-451
Author(s):  
Josef Pieprzyk
Keyword(s):  
Copyright Protection ◽  
Spread Spectrum ◽  
Main Part ◽  
Future Trends ◽  
Copyright Issue ◽  
Review Of The Literature ◽  
Web Page ◽  
Multimedia Documents ◽  
Spread Spectrum Watermarking ◽  
Watermarking Scheme

Internet and its widespread usage for multimedia document distribution put the copyright issue in a complete new setting. Multimedia documents, specifically those installed on a web page, are no longer passive as they typically include active applets. Copyright protection safeguards the intellectual property (IP) of multimedia documents, which are either sold or distributed free of charge. In this Chapter, the basic tools for copyright protection are discussed. First, general concepts and the vocabulary used in copyright protection of multimedia documents are discussed. Later, taxonomy of watermarking and fingerprinting techniques are studied. This part is concluded by a review of the literature dealing with IP security. The main part of the chapter discusses the generic watermarking scheme and illustrates it on three specific examples: collusion-free watermarking, spread spectrum watermarking, and software fingerprinting. Future trends and conclusions close the chapter.

scholarly journals NSCT Domain Additive Watermark Detection Using RAO Hypothesis Test and Cauchy Distribution

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
Hongbo Bi ◽  
Ying Liu ◽  
Mengmeng Wu ◽  
Yanliang Ge
Keyword(s):  
Spread Spectrum ◽  
Hypothesis Test ◽  
Image Watermarking ◽  
Random Noise ◽  
Cauchy Distribution ◽  
The Other ◽  
Lower Probability ◽  
Probability Of False Alarm ◽  
Low Pass ◽  
Watermarking Scheme

We presented a RAO hypothesis detector by modeling Cauchy distribution for the Nonsubsampled Contourlet Transform (NSCT) subband coefficients in the field of additive spread spectrum image watermarking. Firstly, the NSCT subband coefficients were modeled following the Cauchy distributions, and the Fit of Goodness shows that Cauchy distribution fits the NSCT subband coefficients more accurately than the Generalized Gaussian Distribution (GGD) commonly used. Secondly, a blind RAO test watermark detector was derived in the NSCT domain, which does not need the knowledge of embedding strength at the receiving end. Finally, compared to the other three state-of-art detectors, the robustness of the proposed watermarking scheme was evaluated when the watermarked images were attacked by JPEG compression, random noise, low pass filtering, and median filtering. Experimental results show that, compared with the other three detectors, the proposed RAO detector guarantees the lower probability of miss under the given probability of false alarm.

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