Lode Nachtergaele

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1 Abstract The memory required for the implementation of the 2D wavelet transform typically incurs relatively high power consumption and limits the speed performances. In this paper we propose an optimized architecture of the 1D/2D wavelet transform, that reduces the memory size cost with one order of magnitude compared to classical implementation styles.(More)
A battery powered multimedia communication device requires a very energy efficient implementation. The required efficiency can only be acquired by careful optimization at all levels of the design. System-level power optimizations have a dramatic impact on the overall power budget. We have proposed a system-level step-wise methodology to reduce the power in(More)
It has extensively been demonstrated that system-level methodologies are crucial for the realization of low power implementations of data dominated systems. In this paper, we focus on the low power design problem for multimedia systems, for which the data transfer and storage cost is indeed dominant. We present the implications of integrating a system-level(More)
size and power in video and image processing systems L.Nachtergaele, F.Catthoor, F.Balasa, F.Franssen, E.De Greef, H.Samsom, H.De Many IMEC, Kapeldreef 75, B3001 Leuven, Belgium yProfessor at the Katholieke Universiteit Leuven, Belgium Abstract Video and image processing applications deal with large amounts of data which have to be stored and transferred.(More)
In this paper we first illustrate the crucial impact of memory related power consumption on the global system power budget, in particular for multi-dimensional signal processing subsystems. A realistic example demonstrates that the power budget of the system is clearly dominated by the memory access and that up to an order of magnitude can be gained by(More)
In this paper we present our power exploration methodology for data dominated video applications. This formalized methodology is based on the observation that for this type of applications the power consumption is dominated by the memory architecture. Hence, the first exploration stage should be to come up with an optimized memory organisation. Other(More)
This paper addresses the important problem of ef-cient system-level evaluation for real-time multi-dimensional signal processing systems, as occurring in image, speech and video processing. We solve both the diicult task of nding a correct procedural ordering for the evaluation (without expanding the code to scalars) and the optimisation of the loop(More)
in increasingly more systems because of the eternal push for more complex applications, especially those with larger and more complicated data types.1 In addition, the access speed, size, and power consumption associated with storage form a severe bottleneck in these systems, especially in the embedded context. In this article, we will investigate several(More)