This paper proposes a model to support sign language content development and deployment in digital television scenarios. The model objective is to overcome traditional video limitations on the production of signed con...
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作者：
Lee, S.Chung Ang Univ
Dept Image Engn Grad Sch Adv Imaging Sci Multimedia & Film Seoul 156756 South Korea
A compressed image reproduction scheme is proposed by properly decomposing and manipulating the coefficients of discrete cosine transform (DCT) directly in the compressed domain. The basic idea of the proposed approac...
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A compressed image reproduction scheme is proposed by properly decomposing and manipulating the coefficients of discrete cosine transform (DCT) directly in the compressed domain. The basic idea of the proposed approach is to decompose each DCT block into several sub-blocks and to adjust the brightness and detail components of a given image for compressing dynamic range and enhancing contrast. Image reproduction based on the subblock decomposition can be done more precisely than any approach based on the normal block-sized approach. First, DCT coefficients of each block are decomposed into several sub-blocks. Next each sub-block's coefficients are separated into brightness and detail components, and treated differently according to content analysis. Then, the enhanced coefficients are projected on the constraint sets to avoid some artefacts, and are composed back to the original order. The main advantages of the proposed algorithm are that (i) it can enhance the dynamic range and details without affecting the compressibility of the given image since it operates directly in the compressed domain, and (ii) it does not boost blocking artefacts around big edges without any further processing. In order to evaluate the proposed scheme, several base-line approaches are described and compared using enhancement quality measures.
The proceedings contain 13 papers. The topics discussed include: case studies on context-aware mobile multimedia services;content-based image retrieval systems - reviewing and benchmarking;delivery context description...
The proceedings contain 13 papers. The topics discussed include: case studies on context-aware mobile multimedia services;content-based image retrieval systems - reviewing and benchmarking;delivery context descriptions - a comparison and mapping model;a novel tool for quick video summarization using keyframe extraction techniques;authoring interactive mobile services using MPEG-7 and MPEG-4 LASeR;an user study on rich media mobile guide applications;what algorithms for urban routing on mobile devices?;towards the use of multimediacontents to represent events in vehicular ad hoc networks;a multimedia service with MPEG-7 metadata and context semantics;a standards-based generic approach for complex multimedia management;contribution to the modeling of multimedia metadata in a distributed architecture;media center oriented Linux operating system;and a multi-level access control scheme for multimedia database.
Volume visualization with random data access poses significant challenges. While tiling techniques lead to simple implementations, they are not well suited for cases where the goal is to access arbitrarily located sub...
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Volume visualization with random data access poses significant challenges. While tiling techniques lead to simple implementations, they are not well suited for cases where the goal is to access arbitrarily located subdimensional dataseis (e.g., displaying a "band" of several paralllel lines of arbitrary orientation from a 2D image;being able to display an arbitrary 2D planar "cut" from a 3D volume). Significant effort has been devoted to volumetric data compression, with most techniques proposing to tile volumes into cuboid subvolumes to enable random access. In this paper we show that, in cases where subdimensional datasets are accessed, this leads to significant transmission inefficiency. As an alternative, we propose novel server-client based data representation and retrieval methods which can be used for fast random access of low dimensional data from high dimensional datasets. In this paper, 2D experiments are shown but the approach can be extended to higher dimensional datasets. We use multiple redundant tilings of the image, where each tiling has a different orientation. We discuss the 2D rectangular tiling scheme and two main algorithm components of such 2D system, namely, (i) a fast optimal search algorithm to determine which tiles should be retrieved for a given query and (ii) a mapping algorithm to enable efficient encoding without interpolation of rotated tiles. In exchange for increased server storage, we demonstrate that significant reductions, a factor of 2 in bandwidth reduction, can be achieved relative to conventional square tiling techniques. The transmission rate can be reduced even more by allowing more storage overhead. This method speeds up the random access procedure and saves memory on the user's side. Here we use the 2D example to retrieve random lines (or sets of lines) from a 2D image. While our experiments are based on extracting ID data from 2D datasets, the proposed method can be extended to 3D or higher dimensions. The associated basi
More than providing a wireless structure for Internet access, Wireless Mesh Networks are being challenged to support diverse kinds of multimedia applications such as Voice over IP and video streaming in publish-subscr...
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This paper proposes a model to support sign language content development and deployment in digital television scenarios. The model objective is to overcome traditional video limitations on the production of signed con...
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This paper proposes a model to support sign language content development and deployment in digital television scenarios. The model objective is to overcome traditional video limitations on the production of signed content and improve accessibility on digital television. Previous work on sign and gesture recognition, sign notation systems and avatar animation are reviewed. Sign communication requirements are investigated and adequate algorithms are identified to enable sign language processing and transmission. An application interface is proposed in order to access the model functionalities. The final discussion lists the benefits and limitations of the proposed model.
multimediacontent sharing services, such as YouTube, usually offer only low quality video streams. Additionally, it is expected the popularity of these services will increase even further in the future. Therefore, cu...
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multimediacontent sharing services, such as YouTube, usually offer only low quality video streams. Additionally, it is expected the popularity of these services will increase even further in the future. Therefore, current streaming- content delivery architectures, with centralised searching and management components, might not be able to keep up with the ever-growing user bases. In this paper, we propose a scalable and fully distributed end- to-end architecture for delivering streaming multimediacontent. Additionally, we designed several algorithms that allow content servers to intelligently adapt content quality to the available access-link bandwidth and server resources. In this way, the service can improve quality of experience, by offering higher bit-rates at times of low load, while still being able to satisfy as many content requests as possible when the load increases. In depth simulations were performed to validate and evaluate these algorithms. The results show that the proposed platform is capable of increasing delivered stream quality and accepted content requests in various large-scale scenarios.
QoS-oriented content delivery is an important component in en-learning *** this paper,we study the object placement problem in the parallel-access context for QoS-oriented content *** problem is formulated in terms of...
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QoS-oriented content delivery is an important component in en-learning *** this paper,we study the object placement problem in the parallel-access context for QoS-oriented content *** problem is formulated in terms of bandwidth maximization and further proved to be equivalent to the Fault Tolerant Facility Location Problem (FTFL).In this problem the bandwidth that violates the triangle inequality is measured by a cost function which forms a metric when the shortest-path routing is *** there have been efficient UFL algorithms with good performance guarantees,the challenge of the FTFL Problem arises due to the conflict of its connectivity requirement (multiple distinct connections) and cost minimization (which leads to identical connections with the minimum cost).We investigate possible solutions for addressing this conflict after giving an overview of the existing *** of the problem to the context of QoE-aware multimedia delivery which has important applications in elearning systems is also discussed.
QoS-oriented content delivery is an important component in en-learning systems. In this paper, we study the object placement problem in the parallel-access context for QoS-oriented content delivery. The problem is for...
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QoS-oriented content delivery is an important component in en-learning systems. In this paper, we study the object placement problem in the parallel-access context for QoS-oriented content delivery. The problem is formulated in terms of bandwidth maximization and further proved to be equivalent to the Fault Tolerant Facility Location Problem (FTFL). In this problem the bandwidth that violates the triangle inequality is measured by a cost function which forms a metric when the shortest-path routing is deployed. Though there have been *** UFL algorithms with good performance guarantees, the challenge of the FTFL Problem arises due to the *** of its connectivity requirement (multiple distinct connections) and cost minimization (which leads to identical connections with the minimum cost). We investigate possible solutions for addressing this *** after giving an overview of the existing techniques. Extension of the problem to the context of QoE-aware multimedia delivery which has important applications in elearning systems is also discussed.
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