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109 results on '"Bormans, J."'

5. Memory centric design of an MPEG-4 video encoder

Author

Denolf, K., De Vleeschouwer, Christophe, Turney, R., Lafruit, Gauthier, Bormans, J., Denolf, K., De Vleeschouwer, Christophe, Turney, R., Lafruit, Gauthier, and Bormans, J.

Abstract

info:eu-repo/semantics/published

Published
2005

11. MPEG-21: goals and achievements

Author

Burnett, I., Van de Walle, R., Hill, K., Bormans, J., Pereira, F., Burnett, I., Van de Walle, R., Hill, K., Bormans, J., and Pereira, F.

Abstract

MPEG-21 is an open standards-based framework for multimedia delivery and consumption. It aims to enable the use of multimedia resources across a wide range of networks and devices. We discuss MPEG-21's parts, achievements, ongoing activities, and opportunities for new technologies.

Published
2003

12. Algorithmic and architectural co-design of a motion-estimation engine for low-power video devices

Author

UCL - FSA/ELEC - Département d'électricité, De Vleeschouwer, Christophe, Nilsson, T, Denolf, K, Bormans, J, UCL - FSA/ELEC - Département d'électricité, De Vleeschouwer, Christophe, Nilsson, T, Denolf, K, and Bormans, J

Abstract

Due to the large amount of data transfers it involves, the motion estimation (ME) engine is one of the most power-consuming components of any predictive video codec. As a consequence, power-optimized video coding primarily relies on a carefully designed motion estimator. This paper first presents a block ME algorithm that meets high-quality inter-frame prediction and low computational complexity requirements. It relies on a set of rules common to all recent fast and adaptive ME algorithms, but is designed in order to allow for easy and prolific data reuse. The adjacent order of the candidate positions during the search increases the locality and maintains a near-regular data flow, which results in a decrease of the data transfers and a low control complexity. Together with, the computational complexity reduction, it enables cost-efficient very large scale integration realizations. A pipelined parallel architecture is then proposed and discussed. It is generic in the sense that it is suited both to the full-pel and half-pel ME. I It is efficient, because it allows for close to 100% hardware utilization and a sharp decrease of the peak memory bandwidth. It is suited to low-power implementation, as it enables larger data reuse factors for the most probable stages of the adaptive algorithm, which reduces the average memory bandwidth and power consumption.

Published
2002

19. 3D Computational Graceful Degradation

Author

Lafruit, Gauthier, Nachtergaele, L., Denolf, K., Bormans, J., Lafruit, Gauthier, Nachtergaele, L., Denolf, K., and Bormans, J.

Abstract

info:eu-repo/semantics/published

Published
2000

20. Data compression method and apparatus

Author

Bormans, J., Lafruit, Gauthier, De Man, Hugo, Bolsens, I., Bormans, J., Lafruit, Gauthier, De Man, Hugo, and Bolsens, I.

Abstract

info:eu-repo/semantics/published

Published
2000

26. A Scalable Architecture for MPEG-4 Wavelet Quantization

Author

Vanhoof, B., Peón, M., Lafruit, Gauthier, Bormans, J., Nachtergaele, L., Bolsens, I., Vanhoof, B., Peón, M., Lafruit, Gauthier, Bormans, J., Nachtergaele, L., and Bolsens, I.

Abstract

info:eu-repo/semantics/published

Published
1999

47. Optimized memory requirements for wavelet-based scalable multimedia codecs.

Author

Ferentinos, V., Geelen, B., Lafruit, G., Milia, M., Bormans, J., Catthoor, F., and Stouraitis, T.

Subjects
MULTIMEDIA systems, COMPUTER systems, COMPUTER storage devices, DATA compression, CODING theory
Abstract

Powerful multimedia applications are running more and more on very compact and resource-scarce, portable systems. As a consequence, system design optimization, its associated time-to-market constraints and the required automated tool support are becoming increasingly important issues, especially in situations where product derivatives and extensions introduce unforeseen and possibly dramatic constraints in the system optimization process. Nevertheless, the system designer remains an irreplaceable cornerstone for steering the whole system optimization process. This paper presents the relationship of aforementioned aspects in the context of optimizing data access to memory, which is the dominant factor determining the system-on-a-chip area, data throughput and power consumption. The case study of a 1D and 2D forward and inverse wavelet transform, interacting with surrounding system modules imposed by current multimedia compression standards, leads the reader through the peculiar technical counter-measures and script-based optimization steps to be followed for reaching a satisfactory global optimization. In particular, the data dependencies between the different functional modules are shown to be crucial in the memory optimization process and lead to non-trivial/counter-intuitive decision takings that can increase the energy consumption gains compared to more commonly-accepted, though suboptimal approaches. An example is the counter-intuitive observation that though JPEG2000 uses independently entropy coded blocks over its wavelet subbands, it requires more memory because of "hidden" data dependencies, than its zero-tree based MPEG-4 counterpart, whose intricate entropy coding spreads over all the subbands. Hence, to achieve an overall optimal implementation with good trade-offs between efficiency and cost, it is strongly suggested that algorithmic and implementation designers should co-operate in early stages of the multimedia systems design, facilitated by high-level memory cost estimation analyses. [ABSTRACT FROM AUTHOR]

Published
2005

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