Walter Stechele

Bio: Walter Stechele is an academic researcher from Technische Universität München. The author has contributed to research in topics: Control reconfiguration & Field-programmable gate array. The author has an hindex of 21, co-authored 189 publications receiving 1746 citations. Previous affiliations of Walter Stechele include Ludwig Maximilian University of Munich.

A multi-platform controller allowing for maximum Dynamic Partial Reconfiguration throughput

Abstract: Dynamic and partial reconfiguration (DPR) is a special feature offered by Xilinx Field Programmable Gate Arrays (FPGAs), giving the designer the ability to reconfigure a certain portion of the FPGA during run-time without influencing the other parts. This feature allows the hardware to be adaptable to any potential situation. For some applications, such as video-based driver assistance, the time needed to exchange a certain portion of the device might be critical. This paper addresses problems, limitations and results of on-chip reconfiguration that enable the user to decide whether DPR is suitable for a certain design prior to its implementation. A method is therefore introduced to calculate the expected reconfiguration throughput and latency. In addition, an IP core is presented that enables fast on-chip DPR close to the maximum achievable speed. Compared to an alternative state-of-the art realization, an increase in speed by a factor of 58 can be obtained.

Complexity analysis of the emerging MPEG-4 standard as a basis for VLSI implementation

Abstract: A complexity analysis of the video part of the emerging ISO/IEC MPEG-4 standard was performed as a basis for HW/SW partitioning for VLSI implementation of a portable MPEG-4 terminal. While the computational complexity of previously standardized video coding schemes was predictable for I-, P- and B-frames over time, the support of arbitrarily shaped visual objects as well as various coding options within MPEG-4 introduce now content dependent computational requirements with significant variance. In this paper the result of a time dependent complexity analysis of the encoding and decoding process of a binary shape coded video object (VO) and the comparison with a rectangular shaped VO is given for the complete codec as well as for the single tools of the encoding and decoding process. It is shown, that the average MB complexity per arbitrary shaped P-VOP depicts significant variation over time for the encoder and minor variations for the decoder.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

A new framework to accelerate Virtex-II Pro dynamic partial self-reconfiguration

Abstract: The Xilinx Virtex family of FPGAs provides the ability to perform partial run-time reconfiguration, also known as dynamic partial reconfiguration (DPR). Taking this concept one step further, partial dynamic self-reconfiguration becomes possible through the internal configuration access port (ICAP). In this paper a framework for lowering reconfiguration times using the combitgen tool to reduce the overhead found within bitstreams, along with a completely new, very simple and area efficient ICAP controller that is connected directly to the processor local bus (PLB) and is equipped with direct memory access (DMA) capabilities is presented. Using this PLB Master ICAP controller, it is possible to reach the maximum practical throughput that can be achieved with the ICAP interface of Virtex-II Pro devices. Compared to an alternative realization using the OPBHWICAP provided by Xilinx (a slave attachment on the on-chip peripheral bus), it is possible to achieve improvements concerning reconfiguration times by a factor of 20.

Using partial-run-time reconfigurable hardware to accelerate video processing in driver assistance system

Abstract: In this paper we show a reconfigurable hardware architecture for the acceleration of video-based driver assistance applications in future automotive systems. The concept is based on a separation of pixel-level operations and high level application code. Pixel-level operations are accelerated by coprocessors, whereas high level application code is implemented fully programmable on standard PowerPC CPU cores to allow flexibility for new algorithms. In addition, the application code is able to dynamically reconfigure the coprocessors available on the system, allowing for a much larger set of hardware accelerated functionality than would normally fit onto a device. This process makes use of the partial dynamic reconfiguration capabilities of Xilinx Virtex FPGAs.

An MPEG-7 tool for compression and streaming of XML data

Abstract: In the course of work on the MPEG-7 standard, a binary format with special features for the encoding of XML data was required. These required key features are a high data compression ratio, provision for streaming, dynamic update of the document structure and fast random access of data entities in the compressed stream. To support these features, we propose a novel, schema-aware approach which exploits the knowledge of the standardized MPEG-7 syntax definition of the encoded XML document on the encoder and decoder side. The technique is part of the MPEG-7 standard. This paper gives an overview of the coding algorithm, including a comparison to standard (XML) compression tools.

Fundamentals of Queueing Theory

Abstract: Praise for the Third Edition: "This is one of the best books available. Its excellent organizational structure allows quick reference to specific models and its clear presentation . . . solidifies the understanding of the concepts being presented."IIE Transactions on Operations EngineeringThoroughly revised and expanded to reflect the latest developments in the field, Fundamentals of Queueing Theory, Fourth Edition continues to present the basic statistical principles that are necessary to analyze the probabilistic nature of queues. Rather than presenting a narrow focus on the subject, this update illustrates the wide-reaching, fundamental concepts in queueing theory and its applications to diverse areas such as computer science, engineering, business, and operations research.This update takes a numerical approach to understanding and making probable estimations relating to queues, with a comprehensive outline of simple and more advanced queueing models. Newly featured topics of the Fourth Edition include:Retrial queuesApproximations for queueing networksNumerical inversion of transformsDetermining the appropriate number of servers to balance quality and cost of serviceEach chapter provides a self-contained presentation of key concepts and formulae, allowing readers to work with each section independently, while a summary table at the end of the book outlines the types of queues that have been discussed and their results. In addition, two new appendices have been added, discussing transforms and generating functions as well as the fundamentals of differential and difference equations. New examples are now included along with problems that incorporate QtsPlus software, which is freely available via the book's related Web site.With its accessible style and wealth of real-world examples, Fundamentals of Queueing Theory, Fourth Edition is an ideal book for courses on queueing theory at the upper-undergraduate and graduate levels. It is also a valuable resource for researchers and practitioners who analyze congestion in the fields of telecommunications, transportation, aviation, and management science.

Computer and Robot Vision

Abstract: Computer and Robot Vision Vol. 1, by R.M. Haralick and Linda G. Shapiro, Addison-Wesley, 1992, ISBN 0-201-10887-1.

[서평]「Computer Organization and Design, The Hardware/Software Interface」

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Modular intelligent transportation system

Abstract: A modular intelligent transportation system, comprising an environmentally protected enclosure, a system communications bus, a processor module, communicating with said bus, having a image data input and an audio input, the processor module analyzing the image data and/or audio input for data patterns represented therein, having at least one available option slot, a power supply, and a communication link for external communications, in which at least one available option slot can be occupied by a wireless local area network access point, having a communications path between said communications link and said wireless access point, or other modular components.