The Experts below are selected from a list of 15684 Experts worldwide ranked by ideXlab platform
R K Namballa - One of the best experts on this subject based on the ideXlab platform.
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a vlsi architecture for visible watermarking in a secure still digital camera s sup 2 dc design corrected
IEEE Transactions on Very Large Scale Integration Systems, 2005Co-Authors: Saraju P. Mohanty, N. Ranganathan, R K NamballaAbstract:Watermarking is the process that embeds data called a watermark, a tag, or a label into a Multimedia Object, such as images, video, or text, for their copyright protection. According to human perception, the digital watermarks can either be visible or invisible. A visible watermark is a secondary translucent image overlaid into the primary image and appears visible to a viewer on a careful inspection. The invisible watermark is embedded in such a way that the modifications made to the pixel value is perceptually not noticed, and it can be recovered only with an appropriate decoding mechanism. This paper presents a new very large scale integration (VLSI) architecture for implementing two visible digital image watermarking schemes. The proposed architecture is designed to aim at easy integration into any existing digital camera framework. To the authors' knowledge, this is the first VLSI architecture for implementing visible watermarking schemes. A prototype chip consisting of 28 469 gates is implemented using 0.35-/spl mu/m technology, which consumes 6.9-mW power while operating at 292 MHz.
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vlsi implementation of visible watermarking for secure digital still camera design
International Conference on VLSI Design, 2004Co-Authors: Saraju P. Mohanty, N. Ranganathan, R K NamballaAbstract:Watermarking is the process that embeds data called a watermark into a Multimedia Object for its copyright protection. The digital watermarks can be visible to a viewer on careful inspection or completely invisible and cannot be easily recovered without an appropriate decoding mechanism. Digital image watermarking is a computationally intensive task and can be speeded up significantly by implementing in hardware. In this work, we describe a new VLSI architecture for implementing two different visible watermarking schemes for images. The proposed hardware can insert on-the-fly either one or both watermarks into an image depending on the application requirement. The proposed circuit can be integrated into any existing digital still camera framework. First, separate architectures are derived for the two watermarking schemes and then integrated into a unified architecture. A prototype CMOS VLSI chip was designed and verified implementing the proposed architecture and reported in this paper. To our knowledge, this is the first VLSI architecture for implementing visible watermarking schemes.
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vlsi implementation of invisible digital watermarking algorithms towards the development of a secure jpeg encoder
Signal Processing Systems, 2003Co-Authors: Saraju P. Mohanty, N. Ranganathan, R K NamballaAbstract:The research in digital watermarking is well matured. Several watermarking algorithms have been proposed for image, video, audio and text in the current literature. Digital watermarking is the process that embeds data, called a watermark, into a Multimedia Object such that the watermark can be detected or extracted later to make an assertion about the Object. The number of software implementations of the proposed algorithms is significantly large, whereas a hardware implementations is lacking. Hardware implementation has advantages over software implementation in terms of low power, high performance, and reliability. We have developed a hardware system that can insert both robust and fragile invisible watermarks in the image. The hardware module can be easily incorporated in a JPEG encoder to develop a secure JPEG encoder. The watermark module is implemented using 0.35 /spl mu/m CMOS technology. To our knowledge, this is the first watermarking chip implementing both invisible-robust and invisible-fragile watermarks.
M Lukacs - One of the best experts on this subject based on the ideXlab platform.
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the personal presence system a wide area network resource for the real time composition of multipoint Multimedia communications
ACM Multimedia, 1994Co-Authors: David G. Boyer, M LukacsAbstract:The Personal Presence System (PPS) is an experimental prototype platform to support advanced Broadband applications including Multimedia conferencing and distance learning. The PPS supports user presentation control of advanced network elements (Multimedia bridges). The Multimedia bridges are shared network resources which are designed for deployment in proximity to other switching and transcoding resources. The Multimedia bridge provides for a single point of contact for each user so that only one combined video stream is received, thereby minimizing access bandwidth. This architecture solves the N squared transmission problem of multipoint video conferencing and allows customer premises terminal equipment to be much simpler and less expensive than high end desktop workstations. A conventional television with a set-top box may also be used as the terminal equipment for a multiparty Multimedia teleconference, enabling universal video teleconferencing. The PPS provides each user with flexible presentation control of a feature-rich video bridge. Each user is able to control and customize the position, magnification and size of the video Objects that they choose to receive. During the life time of a PPS session, a user can choose to receive new video Objects and change how the Objects are presented. In addition to supporting these basic video display capabilities, the PPS also supports advanced features such as Object extraction from it's background and Multimedia Object associations. Multimedia associations allow a user to group together video Objects into a meta-Object for operations such as scaling, panning, and moving. A user can also control which other users in a session can receive the information that they are providing. This paper is a companion to another paper in this proceedings: “The Personal Presence System—Hardware Architecture” which describes the advanced video bridge experimental prototype hardware that enables this service.
Saraju P. Mohanty - One of the best experts on this subject based on the ideXlab platform.
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a vlsi architecture for visible watermarking in a secure still digital camera s sup 2 dc design corrected
IEEE Transactions on Very Large Scale Integration Systems, 2005Co-Authors: Saraju P. Mohanty, N. Ranganathan, R K NamballaAbstract:Watermarking is the process that embeds data called a watermark, a tag, or a label into a Multimedia Object, such as images, video, or text, for their copyright protection. According to human perception, the digital watermarks can either be visible or invisible. A visible watermark is a secondary translucent image overlaid into the primary image and appears visible to a viewer on a careful inspection. The invisible watermark is embedded in such a way that the modifications made to the pixel value is perceptually not noticed, and it can be recovered only with an appropriate decoding mechanism. This paper presents a new very large scale integration (VLSI) architecture for implementing two visible digital image watermarking schemes. The proposed architecture is designed to aim at easy integration into any existing digital camera framework. To the authors' knowledge, this is the first VLSI architecture for implementing visible watermarking schemes. A prototype chip consisting of 28 469 gates is implemented using 0.35-/spl mu/m technology, which consumes 6.9-mW power while operating at 292 MHz.
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vlsi implementation of visible watermarking for secure digital still camera design
International Conference on VLSI Design, 2004Co-Authors: Saraju P. Mohanty, N. Ranganathan, R K NamballaAbstract:Watermarking is the process that embeds data called a watermark into a Multimedia Object for its copyright protection. The digital watermarks can be visible to a viewer on careful inspection or completely invisible and cannot be easily recovered without an appropriate decoding mechanism. Digital image watermarking is a computationally intensive task and can be speeded up significantly by implementing in hardware. In this work, we describe a new VLSI architecture for implementing two different visible watermarking schemes for images. The proposed hardware can insert on-the-fly either one or both watermarks into an image depending on the application requirement. The proposed circuit can be integrated into any existing digital still camera framework. First, separate architectures are derived for the two watermarking schemes and then integrated into a unified architecture. A prototype CMOS VLSI chip was designed and verified implementing the proposed architecture and reported in this paper. To our knowledge, this is the first VLSI architecture for implementing visible watermarking schemes.
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vlsi implementation of invisible digital watermarking algorithms towards the development of a secure jpeg encoder
Signal Processing Systems, 2003Co-Authors: Saraju P. Mohanty, N. Ranganathan, R K NamballaAbstract:The research in digital watermarking is well matured. Several watermarking algorithms have been proposed for image, video, audio and text in the current literature. Digital watermarking is the process that embeds data, called a watermark, into a Multimedia Object such that the watermark can be detected or extracted later to make an assertion about the Object. The number of software implementations of the proposed algorithms is significantly large, whereas a hardware implementations is lacking. Hardware implementation has advantages over software implementation in terms of low power, high performance, and reliability. We have developed a hardware system that can insert both robust and fragile invisible watermarks in the image. The hardware module can be easily incorporated in a JPEG encoder to develop a secure JPEG encoder. The watermark module is implemented using 0.35 /spl mu/m CMOS technology. To our knowledge, this is the first watermarking chip implementing both invisible-robust and invisible-fragile watermarks.
Umberto Straccia - One of the best experts on this subject based on the ideXlab platform.
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reasoning within fuzzy description logics
arXiv: Artificial Intelligence, 2011Co-Authors: Umberto StracciaAbstract:Description Logics (DLs) are suitable, well-known, logics for managing structured knowledge. They allow reasoning about individuals and well defined concepts, i.e., set of individuals with common properties. The experience in using DLs in applications has shown that in many cases we would like to extend their capabilities. In particular, their use in the context of Multimedia Information Retrieval (MIR) leads to the convincement that such DLs should allow the treatment of the inherent imprecision in Multimedia Object content representation and retrieval. In this paper we will present a fuzzy extension of ALC, combining Zadeh's fuzzy logic with a classical DL. In particular, concepts becomes fuzzy and, thus, reasoning about imprecise concepts is supported. We will define its syntax, its semantics, describe its properties and present a constraint propagation calculus for reasoning in it.
Sahr Thomas Acton - One of the best experts on this subject based on the ideXlab platform.
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Spatial domain digital watermarking of Multimedia Objects for buyer authentication
IEEE Transactions on Multimedia, 2004Co-Authors: Dipti Prasad Mukherjee, Subhamoy Maitra, Sahr Thomas ActonAbstract:Most of the existing watermarking processes become vulnerable when the attacker knows the watermark insertion algorithm. This paper presents an invisible spatial domain watermark insertion algorithm for which we show that the watermark can be recovered, even if the attacker tries to manipulate the watermark with the knowledge of the watermarking process. The process incorporates buyer specific watermarks within a single Multimedia Object, and the same Multimedia Object has different watermarks that differ from owner to owner. Therefore recovery of this watermark not only authenticates the particular owner of the Multimedia Object but also could be used to identify the buyer involved in the forging process. This is achieved after spatially dividing the Multimedia signal randomly into a set of disjoint subsets (referred to as the image key) and then manipulating the intensity of these subsets differently depending on a buyer specific key. These buyer specific keys are generated using a secret permutation of error correcting codes so that exact keys are not known even with the knowledge of the error correcting scheme. During recovery process a manipulated buyer key (due to attack) is extracted from the knowledge of the image key. The recovered buyer key is matched with the exact buyer key in the database utilizing the principles of error correction. The survival of the watermark is demonstrated for a wide range of transformations and forging attempts on Multimedia Objects both in spatial and frequency domains. We have shown that quantitatively our watermarking survives rewatermarking attack using the knowledge of the watermarking process more efficiently compared to a spread spectrum based technique. The efficacy of the process increases in scenarios in which there exist fewer numbers of buyer keys for a specific Multimedia Object. We have also shown that a minor variation of the watermark insertion process can survive a "Stirmark" attack. By making the image key and the intensity manipulation proms specific for a buyer and with proper selection of error correcting codes, certain categories of collusion attacks can also be precluded.