Arnold, JF, Frater, MR & Zhang, J 1999, 'Error resilience in the MPEG-2 video coding standard for cell based networks – A review', Signal Processing: Image Communication, vol. 14, no. 6-8, pp. 607-633.
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The MPEG-2 video coding standard is being extensively used worldwide for the provision of digital video services. Many of these applications involve the transport of MPEG-2 video over cell-based (or packet) networks. Examples include the broadband integr
Bird, TS, Mahon, SJ, Hay, SG, Parfitt, AJ, Rao, N, Ward, D, Dadello, A, Bateman, DG & Sprey, MA 1999, 'Ka-Band Transponder for a Small LEO Satellite', Asia-Pacific Microwave Conference Proceedings, APMC, vol. 3, pp. 690-693.
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A 30/20 GHz transponder has been developed for a small low-earth orbit (LEO) satellite called FedSat-1. The design of MMICs and efficient horn antennas for the transponder is outlined and measured results are presented. Integration of the components into a compact, lightweight and power efficient communications package is described.
Cucchiara, R & Piccardi, M 1999, 'Eliciting visual primitives for detection of elongated shapes', Image and Vision Computing, vol. 17, no. 5-6, pp. 347-355.
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This paper deals with the problem of eliciting visual primitives for visual search with the aim of detecting 2D objects characterized, primarily, by an elongated shape. The paper proposes a new visual primitive obtained by combining in a suitable correla
Cucchiara, R, Piccardi, M & Mello, P 1999, 'Image analysis and rule-based reasoning for a traffic monitoring system', Proceedings 199 IEEE/IEEJ/JSAI International Conference on Intelligent Transportation Systems (Cat. No.99TH8383), pp. 758-763.
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The paper describes a system for detecting vehicles in urban traffic scenes in daytime and at night by means of image analysis and rule-based reasoning. The strength of the proposed approach is its formal separation between the low-level image processing modules (detecting moving vehicles under day and night light) and the high-level module, which provides a single framework for tracking vehicles in the scene. The image processing modules perform spatio-temporal analysis on moving templates in daytime images, and morphological analysis of headlight pairs in night images. The high-level module is designed as a forward chained production rule system, working on symbolic data, i.e. vehicles and their attributes (area, pattern, direction...) and exploiting a set of heuristic rules tuned to urban traffic conditions. The synergy between the artificial intelligence techniques of the high level and the low-level image analysis techniques provides the system with flexibility and robustness.
Cucchiara, R, Piccardi, M & Prati, A 1999, 'Exploiting cache in multimedia', Proceedings IEEE International Conference on Multimedia Computing and Systems, pp. 345-350.
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Dutkiewicz, E & Anido, G 1999, 'Characterising output traffic from an ATM multiplexer', Journal of Electrical and Electronics Engineering, Australia, vol. 19, no. 4, pp. 227-232.
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Proper dimensioning of ATM multiplexers is required for efficient and cost effective operation of ATM networks. In order to dimension an ATM multiplexer, the characteristics and quality of service requirements of the traffic need to be known. Since traffic in an ATM network can traverse through a number of ATM multiplexers, its original characteristics can be affected by the multiplexing operations. In this paper we use a queuing model for the ATM multiplexer to investigate inter-departure time characteristics of the resulting output traffic. The aggregate input traffic to the ATM multiplexer is modelled as a 2-state Markov-modulated Poisson process. By considering a number of case studies we demonstrate that inter-departure time characteristics such as the first two moments of the inter-departure time distribution and the low order correlations between the inter-departure times are inadequate to characterise output traffic for accurate prediction of cell loss.
Frater, MR, Arnold, JF & Zhang, J 1999, 'MPEG 2 video error resilience experiments:', Signal Processing: Image Communication, vol. 14, no. 3, pp. 269-275.
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With increasing interest in the transport of video traffic over lossy networks, several techniques for improving the quality of video services in the presence of loss have been proposed, often using the MPEG 2 video coding algorithm as a basis. Many of t
Tellambura, C, Johnson, IR, Guo, YJ & Barton, SK 1999, 'Frequency-offset estimation for HIPERLAN', IEEE Transactions on Communications, vol. 47, no. 8, pp. 1137-1139.
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Frequency-offset correction is considered for a HIPERLAN (HIgh-PErformance Radio LAN) system over the indoor radio channel. Since the multipath channel response is not known a priori, a viable frequency-offset estimator should not depend on such knowledge. Such an estimator, using a single sample per symbol, is derived for HIPERLAN. The estimator is shown to approach the Cramer-Rao bound for frequency-offset estimation over a multipath channel. A HIPERLAN system simulation example shows that the performance with an offset of 150 kHz is within 0.5 dB of that of a system with zero frequency offset.
Tellambura, C, Parker, MG, Guo, YJ, Shepherd, SJ & Barton, SK 1999, 'Optimal sequences for channel estimation using discrete Fourier transform techniques', IEEE Transactions on Communications, vol. 47, no. 2, pp. 230-238.
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Veitch, D & Abry, P 1999, 'A wavelet-based joint estimator of the parameters of long-range dependence', IEEE Transactions on Information Theory, vol. 45, no. 3, pp. 878-897.
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Bangun, RA, Dutkiewicz, E & Anido, GJ 1970, 'An analysis of multi-player network games traffic', 1999 IEEE Third Workshop on Multimedia Signal Processing (Cat. No.99TH8451), 1999 IEEE Third Workshop on Multimedia Signal Processing (Cat. No.99TH8451), IEEE.
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Cucchiara, R, Lamma, E, Mello, P, Milano, M & Piccardi, M 1970, '3D object recognition by VC-graphs and interactive constraint satisfaction', Proceedings 10th International Conference on Image Analysis and Processing, ICIAP '99 - 10th International Conference on Image Analysis and Processing, IEEE Comput. Soc, pp. 508-513.
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We propose a novel approach for recognizing 3D CAD-made objects in complex range images containing several overlapped and different objects. Objects are modeled by a graph whose nodes are surfaces and arcs are surface relations. We propose an object-centered graph model, called visual constraint graph (VC-graph), with special visual constraints modeling occlusions between object surfaces. The VC-graph is used for recognizing objects from each possible point of view, instead of evaluating many different single-view graphs. The reasoning engine is based on an original extension of the constraint satisfaction problem (CSP) paradigm, called interactive CSP (ICSP). CSP requires the acquisition of all surfaces before starting constraint propagation; instead, ICSP guides the acquisition of new surfaces only on-demand, without computing useless information and focusing attention only on significant image parts. © 1999 IEEE.
Cucchiara, R, Piccardi, M, Prati, A & Scarabottolo, N 1970, 'Real-time detection of moving vehicles', Proceedings 10th International Conference on Image Analysis and Processing, ICIAP '99 - 10th International Conference on Image Analysis and Processing, IEEE Comput. Soc, pp. 618-623.
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Computer vision-based traffic flow monitoring is of major importance for enforcing traffic management policies. Information such as the number of vehicles passing on a road per time unit, or vehicles' turning rates at intersections are exploited by traffic management policies to supervise traffic-light timings. Computer vision-based traffic flow monitoring requires extraction of moving vehicles from traffic scenes in real time. To accomplish this task, efficient algorithms must be used and effective, low-cost hardware implementation must be pursued. This paper first describes the algorithms used in the VTTS (vehicular traffic tracking system) to achieve segmentation of moving vehicles. Then, hardware implementation on a re-programmable FPGA-based board is described in detail. © 1999 IEEE.
Dutkiewicz, E & Boustead, P 1970, 'Analysis of per-flow and aggregate QoS in scalable QoS networks', IEEE International Conference on Networks. ICON '99 Proceedings (Cat. No.PR00243), ICON'99: IEEE International Conference on Networks, IEEE Comput. Soc, pp. 289-294.
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The future Internet will support a large variety of services whose QoS requirements may vary widely. In order to provide scalable quality of service traffic aggregation may be necessary. We examine several approaches to providing scalable QoS services which includes soft QoS with relative performance guarantees, and hard performance guarantees signaled by RSVP over an aggregated cell switched core. In these approaches QoS is based on aggregate traffic. The question then arises as to what level of QoS is perceived by individual flows within the aggregate. This has an important implication on QoS guarantees which the network can make to individual users. To provide answers to the above question we analyse per-flow and aggregate QoS in an ATM virtual path (VP) which is used as an example of a cut-through handling IP flows. Using cell loss as a measure of QoS, our analysis allows us to investigate the impact of the parameters of individual flows on per-flow QoS. We then compare per-flow QoS against the QoS experienced by the aggregate flow in the VP. Based on numerical tests we find that cell loss experienced by individual flows may be very different from cell loss experienced by the aggregate flow. Thus if aggregate cell loss is used as a QoS constraint in dimensioning of VP this may lead to unfair treatment of flows and hence to potential user dissatisfaction. © 1999 IEEE.
Lamma, E, Mello, P, Milano, M, Cucchiara, R, Gavanelli, M & Piccardi, M 1970, 'Constraint propagation and value acquisition: Why we should do it Interactively', IJCAI International Joint Conference on Artificial Intelligence, 16th International Joint Conference on Artificial Intelligence (IJCAI 99), MORGAN KAUFMANN PUB INC, STOCKHOLM, SWEDEN, pp. 468-473.
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In Constraint Satisfaction Problems (CSPs) values belonging to variable domains should be completely known before the constraint propagation process starts. In many applications, however, the acquisition of domain values is a computational expensive process or some domain values could not be available at the beginning of the computation. For this purpose, we introduce an Interactive Constraint Satisfaction Problem (ICSP) model as extension of the widely used CSP model. The variable domain values can be acquired when needed during the resolution process by means of Interactive Constraints, which retrieve (possibly consistent) information. Experimental results on randomly generated CSPs and for 3D object recognition show the effectiveness of the proposed approach.
Roughan, M & Veitch, D 1970, 'A study of the daily variation in the self-similarity of real data traffic', TELETRAFFIC ENGINEERING IN A COMPETITIVE WORLD, International Teletraffic Congress (ITC-16) - Teletraffic Engineering in a Competitive World, ELSEVIER SCIENCE BV, EDINBURGH, SCOTLAND, pp. 67-76.
Roughan, M & Veitch, D 1970, 'Measuring long-range dependence under changing traffic conditions', IEEE INFOCOM '99. Conference on Computer Communications. Proceedings. Eighteenth Annual Joint Conference of the IEEE Computer and Communications Societies. The Future is Now (Cat. No.99CH36320), IEEE INFOCOM '99. Conference on Computer Communications. Proceedings. Eighteenth Annual Joint Conference of the IEEE Computer and Communications Societies. The Future is Now (Cat. No.99CH36320), IEEE, IEEE, pp. 1513-1521.
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