Imperial College London
Alternate

Emeritus ProfessorTonyConstantinides

Faculty of Engineering, Department of Electrical and Electronic Engineering

Honorary Emeritus Professor of Comm & Signal Processing
 
 
 
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Contact

 

+44 (0)20 7594 6231a.constantinides

 
 
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Assistant

 

Miss Vanessa Rodriguez-Gonzalez +44 (0)20 7594 6267

 
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Location

 

618Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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185 results found

Antoniou ZC, Panayides AS, Pantziaris M, Constantinides AG, Pattichis CS, Pattichis MSet al., 2016, Dynamic Network Adaptation for Real-Time Medical Video Communication, 14th Mediterranean Conference on Medical and Biological Engineering and Computing (MEDICON), Publisher: SPRINGER, Pages: 1093-1098, ISSN: 1680-0737

The wider adoption of mHealth video communication systems in standard clinical practice requires adequate levels of clinical video quality to support reliable diagnosis. The latter dictates that real-time adaptation to time-varying wireless networks’ state to guarantee clinically acceptable performance throughout the streaming session, while conforming to device capabilities for supporting real-time encoding. In this study we propose a multi-objective optimization framework that jointly maximizes the encoded video’s quality while minimizing bitrate demands and encoding time. Experimental investigation shows that the proposed framework can provide for efficient real-time adaptation at a Group of Pictures (GOP) level, demonstrating significant gains over static approaches.

Conference paper

Feng R-B, Leung C-S, Constantinides AG, 2016, LCA based RBF training algorithm for the concurrent fault situation, Neurocomputing, Vol: 191, Pages: 341-351, ISSN: 1872-8286

Journal article

Mandic DP, Kanna S, Constantinides AG, 2015, On the Intrinsic Relationship Between the Least Mean Square and Kalman Filters, IEEE SIGNAL PROCESSING MAGAZINE, Vol: 32, Pages: 117-122, ISSN: 1053-5888

Journal article

Thanthawaritthisai T, Tobar F, Constantinides AG, Mandic DPet al., 2015, THE WIDELY LINEAR QUATERNION RECURSIVE TOTAL LEAST SQUARES, 40th IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Publisher: IEEE, Pages: 3357-3361, ISSN: 1520-6149

Conference paper

Han Z-F, Leung C-S, So HC, Sum J, Constantinides AGet al., 2015, Non-Line-of-Sight Mitigation via Lagrange Programming Neural Networks in TOA-Based Localization, 22nd International Conference on Neural Information Processing (ICONIP), Publisher: SPRINGER INTERNATIONAL PUBLISHING AG, Pages: 190-197, ISSN: 0302-9743

Conference paper

Leung C-S, Sum J, Constantinides AG, 2014, Recurrent networks for compressive sampling, NEUROCOMPUTING, Vol: 129, Pages: 298-305, ISSN: 0925-2312

Journal article

Tobar FA, Orchard ME, Mandic DP, Constantinides AGet al., 2014, Estimation of Financial Indices Volatility Using a Model with Time-Varying Parameters, IEEE Conference on Computational Intelligence for Financial Engineering and Economics (CIFEr), Publisher: IEEE, Pages: 318-324, ISSN: 2380-8454

Conference paper

Leung CS, Sum J, So HC, Constantinides AG, Chan FKWet al., 2014, Lagrange programming neural networks for time-of-arrival-based source localization, NEURAL COMPUTING & APPLICATIONS, Vol: 24, Pages: 109-116, ISSN: 0941-0643

Journal article

Chobey DK, Lim YC, Constantinides AG, 2014, Steady-State Comparative Performance Evaluation of Piloted Adaptive Notch Filter, 19th International Conference on Digital Signal Processing (DSP), Publisher: IEEE, Pages: 316-320, ISSN: 1546-1874

Conference paper

Feng R, Leung C-S, Constantinides AG, 2014, An Analog Network Approach to train RBF Networks based on Sparse Recovery, 19th International Conference on Digital Signal Processing (DSP), Publisher: IEEE, Pages: 903-908, ISSN: 1546-1874

Conference paper

Panayides A, Pattichis MS, Loizou C, Pantziaris M, Constantinides AG, Pattichis Cet al., 2014, An Effective Ultrasound Video Communication System Using Despeckle Filtering and HEVC, Biomedical and Health Informatics, IEEE Journal of, Vol: PP, Pages: 1-8, ISSN: 2168-2194

Journal article

Lim YC, Huang C, Li G, Xu H, Constantinides AGet al., 2013, Error Spectrum Shaping Approach for Lattice Filter Roundoff Noise Reduction, IEEE International Symposium on Circuits and Systems (ISCAS), Publisher: IEEE, Pages: 85-88, ISSN: 0271-4302

Conference paper

Panayides AS, Pattichis MS, Constantinides AG, Pattichis CSet al., 2013, M-health medical video communication systems: An overview of design approaches and recent advances, Pages: 7253-7256-7253-7256, ISSN: 1557-170X

The emergence of the new, High Efficiency Video Coding (HEVC) standard, combined with wide deployment of 4G wireless networks, will provide significant support toward the adoption of mobile-health (m-health) medical video communication systems in standard clinical practice. For the first time since the emergence of m-health systems and services, medical video communication systems can be deployed that can rival the standards of in-hospital examinations. In this paper, we provide a thorough overview of today’s advancements in the field, discuss existing approaches, and highlight the future trends and objectives.

Conference paper

Rebollo-Neira L, Bowley J, Constantinides AG, Plastino Aet al., 2012, Self-contained encrypted image folding, PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, Vol: 391, Pages: 5858-5870, ISSN: 0378-4371

Journal article

Zhang X, Banavar MK, Willerton M, Manikas A, Tepedelenlioglu C, Spanias A, Thornton T, Yeatman E, Constantinides AGet al., 2012, Performance comparison of localization techniques for sequential WSN discovery

In this paper, the performance of different localization algorithms are compared in the context of the sequential Wireless Sensor Network (WSN) discovery problem. Here, all sensor nodes are at unknown locations except for a very small number of so called anchor nodes at known locations. The locations of nodes are sequentially estimated such that when the location of a given node is found, it may be used to localize others. The underlying performance of such an approach is largely dependent upon the localization technique employed. In this paper, several well-known localization techniques are presented using a unified notation. These methods are time of arrival (TOA), time difference of arrival (TDOA), received signal strength (RSS), direction of arrival (DOA) and large aperture array (LAA) localization. The performance of a sequential network discovery process is then compared when using each of these localization algorithms. These algorithms are implemented in the Java-DSP software package as part of a localization toolbox.

Conference paper

Panayides A, Antoniou Z, Pattichis MS, Pattichis CS, Constantinides AGet al., 2012, High efficiency video coding for ultrasound video communication in m-health systems., Annu Int Conf IEEE Eng Med Biol Soc, Vol: 2012, Pages: 2170-2173

Emerging high efficiency video compression methods and wider availability of wireless network infrastructure will significantly advance existing m-health applications. For medical video communications, the emerging video compression and network standards support low-delay and high-resolution video transmission, at the clinically acquired resolution and frame rates. Such advances are expected to further promote the adoption of m-health systems for remote diagnosis and emergency incidents in daily clinical practice. This paper compares the performance of the emerging high efficiency video coding (HEVC) standard to the current state-of-the-art H.264/AVC standard. The experimental evaluation, based on five atherosclerotic plaque ultrasound videos encoded at QCIF, CIF, and 4CIF resolutions demonstrates that 50% reductions in bitrate requirements is possible for equivalent clinical quality.

Journal article

Willerton M, Banavar M, Zhang X, Manikas A, Tepedelenlioglu C, Spanias A, Thornton T, Yeatman E, Constantinides AGet al., 2012, Sequential Wireless Sensor Network Discovery Using Wide Aperture Array Signal Processing, EUSIPCO 2012

In this paper, a novel wireless sensor network discovery algorithm is presented which estimates the position of a large number of low powered, randomly distributed sensor nodes. Initially, all nodes are at unknown locations except for a smallnumber which are termed the “anchor” nodes. The remaining nodes are to be located as part of the discovery procedure. As the locations of sensor nodes are estimated, they can be used in the localization of other nodes. Transmitting nodes in unknown locations are localized in a decentralized manner by using a set of receiving sensor nodes at known or estimated locations within its coverage area. This set of nodes forms an array which is used for localization. Initially a coarse localisation of all nodes is performed to identify their approximate positions. A fine grained localization procedure then follows for refinement. This paper will focus on the coarse localizationapproach. Simulations demonstrate the effectiveness of the proposed method.

Conference paper

Boukis C, Mandic DP, Constantinides AG, Polymenakos LCet al., 2010, A modified Armijo rule for the online selection of learning rate of the LMS algorithm, DIGITAL SIGNAL PROCESSING, Vol: 20, Pages: 630-639, ISSN: 1051-2004

Journal article

Lam P-M, Leung CS, Sum J, Constantinides AGet al., 2010, Lagrange Programming Neural Networks for Compressive Sampling, 17th International Conference on Neural Information Processing, Publisher: SPRINGER-VERLAG BERLIN, Pages: 177-+, ISSN: 0302-9743

Conference paper

Talantzis F, Constantinides AG, 2009, A Multimicrophone Voice Activity Detection System Based on Mutual Information, JOURNAL OF THE AUDIO ENGINEERING SOCIETY, Vol: 57, Pages: 937-950, ISSN: 1549-4950

Journal article

Zhu S, Leung KK, Constantinides AG, 2009, Distributed Cooperative Data Relaying for Diversity in Impulse-Based UWB Ad-Hoc Networks, IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, Vol: 8, Pages: 4037-4047, ISSN: 1536-1276

Journal article

Boukis C, Mandic DP, Constantinides AG, 2009, A class of stochastic gradient algorithms with exponentiated error cost functions, DIGITAL SIGNAL PROCESSING, Vol: 19, Pages: 201-212, ISSN: 1051-2004

Journal article

Zhu S, Leung KK, Constantinides AG, 2009, Impacts of impulse-based ultra-wideband data links on cooperative wireless ad hoc networks, IET COMMUNICATIONS, Vol: 3, Pages: 321-330, ISSN: 1751-8628

Journal article

Talantzis F, Pnevmatikakis A, Constantinides AG, 2009, Audio-Visual Active Speaker Tracking in Cluttered Indoors Environments (Reprinted from IEEE Trans. Syst., Man, Cybern., Part B, vol 38, pg 799-807, 2008), IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS, Vol: 39, Pages: 7-15, ISSN: 1083-4419

Journal article

Jing X, Siu W-C, Chau L-P, Constantinides AGet al., 2009, Efficient Inter Mode Decision for H.263 to H.264 Video Transcoding Using Support Vector Machines, IEEE International Symposium on Circuits and Systems (ISCAS 2009), Publisher: IEEE, Pages: 2349-+, ISSN: 0271-4302

Conference paper

Talantzis F, Constantinides AG, 2009, USING INFORMATION THEORY TO DETECT VOICE ACTIVITY, IEEE International Conference on Acoustics, Speech and Signal Processing, Publisher: IEEE, Pages: 4613-+, ISSN: 1520-6149

Conference paper

Alrabadi ON, Talantzis F, Constantinides AG, 2009, Locating an Acoustic Source Using a Mutual Information Beamformer, 5th IFIP Conference on Artificial Intelligence Applications and Innovations, Publisher: SPRINGER, Pages: 283-291, ISSN: 1571-5736

Conference paper

Talantzis F, Pnevmatikakis A, Constantinides AG, 2008, Audio-visual active speaker tracking in cluttered indoors environments, IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS, Vol: 38, Pages: 799-807, ISSN: 1083-4419

Journal article

Supakwong S, Manikas A, Constantinides AG, 2008, Analysis of Three-Parameter Diversely Polarized Array Manifold, 19th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Publisher: IEEE, Pages: 552-556

Conference paper

Chin WH, Ward DB, Constantinides AG, 2007, Algorithm for exploiting channel time selectivity in pilot-aided MIMO systems, IET COMMUNICATIONS, Vol: 1, Pages: 1267-1273, ISSN: 1751-8628

Journal article

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