Alexandros Eleftheriadis

Sheffield City Council

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Dimitris Anastassiou

Columbia University

Hari Kalva

Florida Atlantic University

Shih‐Fu Chang

Columbia University

Stephen E. Jacobs

Columbia University

Lai-Tee Cheok

Samsung (United States)

Danny Hong

Center for Devices and Radiological Health

Javier Ortiz Zamora

University of Alicante

Carsten Herpel

Technicolor (Germany)

A. Jacquin

BrainScope (United States)

Huitao Luo

Yahoo (United States)

Cooperative Institutions

Columbia University

Foundation for Research and Technology Hellas

IBM (United States)

Nokia (United States)

Universidad de Valladolid

University of Crete

Czech Academy of Sciences, Institute of Computer Science

Hewlett-Packard (United States)

Institute of Electrical and Electronics Engineers

Signal Processing (United States)

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MPEG-4 Systems: Overview

Signal Processing Image Communication (2000)

O. Avaro Alexandros Eleftheriadis Carsten Herpel Ganesh Rajan Liam Ward

MPEG-4

Interactivity

MPEG-2

10.1016/s0923-5965(99)00050-8

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Citations (32)

XFlavor: bridging bits and objects in media representation

D. Hong Alexandros Eleftheriadis

Flavor is a formal language developed for describing compressed bitstream syntax, especially the bitstreams representing multimedia objects. A translator is also available for translating a Flavor description into C++ or Java code. The code includes bitstream parsing and generating operations that can readily be used by software developers with essentially zero additional programming. After briefly describing the latest version of Flavor, we propose an extension - XFlavor - that provides XML features by transforming the traditional bitstream representation of multimedia data into a corresponding XML representation.

Bitstream

Representation

10.1109/icme.2002.1035896

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Citations (28)

Multimedia Tools and Applications (1997)

Shih‐Fu Chang Dimitris Anastassiou Alexandros Eleftheriadis John V. Pavlik

10.1023/a:1009642129893

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Citations (1)

Effects on soil phosphorus dynamics of municipal solid waste compost addition to a burnt and unburnt forest soil

The Science of The Total Environment (2018)

María‐Belén Turrión Teresa Bueis Francisco Lafuente Olga López Esther San José

10.1016/j.scitotenv.2018.06.051

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Citations (17)

Model-based segmentation and tracking of head-and-shoulder video objects for real time multimedia services

IEEE Transactions on Multimedia (2003)

Huitao Luo Alexandros Eleftheriadis

A statistical model-based video segmentation algorithm is presented for head-and-shoulder type video. This algorithm uses domain knowledge by abstracting the head-and-shoulder object with a blob-based statistical region model and a shape model. The object segmentation problem is then converted into a model detection and tracking problem. At the system level, a hierarchical structure is designed and spatial and temporal filters are used to improve segmentation quality. This algorithm runs in real time over a QCIF size video, and segments it into background, head and shoulder three video objects on average Pentium PC platforms. Due to its real time feature, this algorithm is appropriate for real time multimedia services such as videophone and web chat. Simulation results are offered to compare MPEG-4 performance with H.263 on segmented video objects with respects to compression efficiency, bit rate adaptation and functionality.

Feature (linguistics)

10.1109/tmm.2003.813285

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Citations (15)

Designing an interactive tool for video object segmentation and annotation

Huitao Luo Alexandros Eleftheriadis

10.1145/319878.319934

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Citations (11)

A genetic algorithm for layered multisource video distribution

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2005)

Lai-Tee Cheok Alexandros Eleftheriadis

We propose a genetic algorithm -- MckpGen -- for rate scaling and adaptive streaming of layered video streams from multiple sources in a bandwidth-constrained environment. A genetic algorithm (GA) consists of several components: a representation scheme; a generator for creating an initial population; a crossover operator for producing offspring solutions from parents; a mutation operator to promote genetic diversity and a repair operator to ensure feasibility of solutions produced. We formulated the problem as a Multiple-Choice Knapsack Problem (MCKP), a variant of Knapsack Problem (KP) and a decision problem in combinatorial optimization. MCKP has many successful applications in fault tolerance, capital budgeting, resource allocation for conserving energy on mobile devices, etc. Genetic algorithms have been used to solve NP-complete problems effectively, such as the KP, however, to the best of our knowledge, there is no GA for MCKP. We utilize a binary chromosome representation scheme for MCKP and design and implement the components, utilizing problem-specific knowledge for solving MCKP. In addition, for the repair operator, we propose two schemes (RepairSimple and RepairBRP). Results show that RepairBRP yields significantly better performance. We further show that the average fitness of the entire population converges towards the best fitness (optimal) value and compare the performance at various bit-rates.

Genetic operator

Operator (biology)

10.1117/12.596947

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Citations (0)

XFlavor: providing XML features in media representation

Multimedia Tools and Applications (2007)

Danny Hong Alexandros Eleftheriadis

XML Schema (W3C)

Representation

10.1007/s11042-007-0157-0

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Citations (3)

Optimal shape coding under buffer constraints

Jaebeom Lee Jin-Soo Cho Alexandros Eleftheriadis

In this paper, we derive an optimal rate control algorithm for shape coding as defined in the forthcoming MPEG-4 international standard. The current MPEG-4 shape coding scheme consists of two steps: first, distortion is introduced by down and up scaling; then, context-based arithmetic encoding is applied. Since arithmetic coding is "lossless", the down up scaling step is considered as a virtual quantizer. We first formulate the buffer-constrained adaptive quantization problem for shape coding, and then propose an algorithm for the optimal solution under buffer constraints. Experimental results are given using an MPEG-4 shape codec.

Arithmetic coding

Codec

Rate–distortion theory

Context-adaptive variable-length coding

10.1109/icip.1998.723475

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Citations (1)

Legacy Technology Reemergence: The Case of the Vinyl Record

Academy of Management Proceedings (2020)

Alexandros Eleftheriadis Andreas Alexiou

This paper studies the vinyl records as a cultural icon that “refuses to die” in order to enhance the existing theory about legacy technology and how instead of disappearing, got redefined by its enthusiasts, remerged and created a sustained market growth. After the appearance of CDs and Mp3s, Vinyl Records reached the lowest level of sales from their existence but in 2008 vinyl records managed to gain market share again and year by year became again an equal competitor of the other music formats. This research reveals the processes that vinyl records have gone through in order to reemerge. Furthermore, all the factors that contributed to vinyl records resurgence are analytically discussed and analysed. The vinyl record is being analysed as a cultural icon and a legacy technology and how it managed to reemerge in the digital era. Vinyl records’ enthusiasts' community following the lead of the community’s influencers increased the sales by 300% in a year redefining the meaning of vinyl records and generating word-of-mouth and online and offline mentions about vinyl records. This caused the increase in demand for vinyl records which are considered to have an alternative value rather than functionality.

Icon

10.5465/ambpp.2020.21781abstract

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Citations (4)