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Author

Changsheng Xu

Bio: Changsheng Xu is an academic researcher from University of Sydney. The author has contributed to research in topics: Digital watermarking & Watermark. The author has an hindex of 5, co-authored 8 publications receiving 103 citations.

Papers
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01 May 2001
TL;DR: A web based image authentication method based in digital watermarking can provide more controls to image owners and conveniences to clients who want to get authenticity of image by integrating benefits of using Internet to the watermark system.
Abstract: The demand of security is getting higher in these days due to easy reproduction of digitally created multimedia data. Digital watermark is the emerging technique to embed secret information into content for copyright protection and authentication. Watermark is embedded within an image that alteration and modification to the watermarked image can be detected in a fragile watermark system. Watermark detection is blind that does not require an original image and it is invisible to avoid revealing secret information to malicious attackers. A web based image authentication method based in digital watermarking is described in this paper. It can provide more controls to image owners and conveniences to clients who want to get authenticity of image by integrating benefits of using Internet to the watermark system.

55 citations

Proceedings Article
12 Apr 2000
TL;DR: The experimental results illustrate that the embedded watermark not only does not affect the audio quality in audibility as well as change the bit rates in compressed domain, but also can survive common signal processing methods such as D/A and A/D conversions, adding noise, filtering, re-sampling, and especially the decoding and re-encoding process.
Abstract: This paper proposes a method to embed and extract the digital watermark into and from digital compressed audio. The watermark is embedded in partially uncompressed domain and the embedding scheme is high related to audio content. The watermark content contains owner and user identifications and the watermark embedding and detection can be done very fast to ensure on-line transactions and distributions. The experimental results illustrate that the embedded watermark not only does not affect the audio quality in audibility as well as change the bit rates in compressed domain, but also can survive common signal processing methods such as D/A and A/D conversions, adding noise, filtering, re-sampling, and especially the decoding and re-encoding process. The proposed method is very useful and effective for copyright protection, trace of illegal distributions and other applications.

14 citations

Journal ArticleDOI
TL;DR: A set of digital watermarking schemes for WAV audio, WAV-table synthesis audio and compressed audio that can achieve an optimal balance between audibility and robustness of the watermarked audio.
Abstract: This paper proposes a set of digital watermarking schemes for WAV audio, WAV-table synthesis audio and compressed audio. The watermark embedding scheme is closely related to audio content and based on the human auditory system. The experimental results in listening and robustness illustrate that the proposed watermarking schemes can achieve an optimal balance between audibility and robustness of the watermarked audio. The proposed methods are also very useful and effective for copyright protection, tracing illegal distribution and other applications.

13 citations

Proceedings ArticleDOI
01 Oct 2001
TL;DR: A novel content-adaptive audio watermarking technique is proposed that is high related to audio content by making use of the properties of human auditory system and multiple-bit hopping technique.
Abstract: A novel content-adaptive audio watermarking technique is proposed. To optimally balance in-audibility and robustness when embedding and extracting watermarks, the embedding scheme is high related to audio content by making use of the properties of human auditory system and multiple-bit hopping technique. The experimental results in robustness are provided to support all the novel features in our watermarking scheme.

9 citations


Cited by
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Patent
11 Dec 2003
TL;DR: In this paper, a pre-buffered ten seconds of each of the next several songs on the list is buffered so that the user can skip one or more songs without having an unintended delay between skips.
Abstract: In an Internet based personalized radio, where a user has a pre-selected list of songs to be played in a particular order, the invention provides an apparatus and method allowing the user to skip one or more songs without having an unintended delay between skips This is accomplished by pre-buffering the first ten seconds of each of the next several songs on the list so that, should the user choose to skip to any of the next several songs, the pre-buffered ten seconds of the target song is already available to be played The apparatus starts to play the pre-buffered port of the target song and starts to download the rest of it at the same time Because the initial buffering time for the rest of the target song is less than ten seconds, the target song is played smoothly

312 citations

MonographDOI
01 Jul 2004
TL;DR: This work explores the myriad of issues regarding multimedia security, including perceptual fidelity analysis, image, audio, and 3D mesh object watermarking, medical water marking, and error detection (authentication) and concealment.
Abstract: This work explores the myriad of issues regarding multimedia security. It covers various issues, including perceptual fidelity analysis, image, audio, and 3D mesh object watermarking, medical watermarking, and error detection (authentication) and concealment.

222 citations

Patent
01 Feb 2005
TL;DR: In this paper, a digital rights management system with a centralized domain service capable of creating and managing membership criteria for joining a domain in accordance with business rules defined by the content owner is presented.
Abstract: The present invention provides for a digital rights management system with a centralized domain service capable of creating and managing membership criteria for joining a domain in accordance with business rules defined by ac content owner. A domain identification is created that allows a content provider to uniquely bind content licenses to a domain. The content licenses include usage rights that define how content associated with the licenses may be consumed by one or more members of the domain. The centralized domain service can enforce digital rights by validating membership criteria including at least one of a domain proximity check for validating that a requestor is in close proximity to the domain, a total number of requestors, or the frequency that the requests have been made by various requesters to join the domain and unjoin from the domain.

184 citations

Patent
13 Feb 2004
TL;DR: In this article, the authors propose an interface between two seemingly incompatible and different content protection systems, where protected content may be transferred between the respective security kernels of a conditional access (CA) and digital rights management (DRM) systems, while maintaining security of the content and any associated protection information.
Abstract: The present invention provides for an interface between two seemingly incompatible and different content protection systems. Accordingly, protected content may be transferred between the respective security kernels of a conditional access (CA) and digital rights management (DRM) systems, while maintaining security of the content and any associated protection information. The transfer and consumption of protected content and the associated content protection information may be achieved by temporarily or permanently binding the respective security kernels of the CA and DRM systems, transcribing content protection information, and potentially transcribing the content.

182 citations

01 Jan 2004
TL;DR: The main results of this study are the development of novel audio watermarking algorithms, with the state-of-the-art performance and an acceptable increase in computational complexity.
Abstract: Broadband communication networks and multimedia data available in a digital format opened many challenges and opportunities for innovation. Versatile and simple-to-use software and decreasing prices of digital devices have made it possible for consumers from all around the world to create and exchange multimedia data. Broadband Internet connections and near error-free transmission of data facilitate people to distribute large multimedia files and make identical digital copies of them. A perfect reproduction in digital domain have promoted the protection of intellectual ownership and the prevention of unauthorized tampering of multimedia data to become an important technological and research issue. Digital watermarking has been proposed as a new, alternative method to enforce intellectual property rights and protect digital media from tampering. Digital watermarking is defined as imperceptible, robust and secure communication of data related to the host signal, which includes embedding into and extraction from the host signal. The main challenge in digital audio watermarking and steganography is that if the perceptual transparency parameter is fixed, the design of a watermark system cannot obtain high robustness and a high watermark data rate at the same time. In this thesis, we address three research problems on audio watermarking: First, what is the highest watermark bit rate obtainable, under the perceptual transparency constraint, and how to approach the limit? Second, how can the detection performance of a watermarking system be improved using algorithms based on communications models for that system? Third, how can overall robustness to attacks to a watermark system be increased using attack characterization at the embedding side? An approach that combined theoretical consideration and experimental validation, including digital signal processing, psychoacoustic modeling and communications theory, is used in developing algorithms for audio watermarking and steganography. The main results of this study are the development of novel audio watermarking algorithms, with the state-of-the-art performance and an acceptable increase in computational complexity. The algorithms' performance is validated in the presence of the standard watermarking attacks. The main technical solutions include algorithms for embedding high data rate watermarks into the host audio signal, using channel models derived from communications theory for watermark transmission and the detection and modeling of attacks using attack characterization procedure. The thesis also includes a thorough review of the state-of-the-art literature in the digital audio watermarking.

164 citations