Results 1 - 10 of 9,067

Static Scheduling of Synchronous Data Flow Programs for Digital Signal Processing

by Edward Ashford Lee, David G. Messerschmitt - IEEE TRANSACTIONS ON COMPUTERS , 1987
"... Large grain data flow (LGDF) programming is natural and convenient for describing digital signal processing (DSP) systems, but its runtime overhead is costly in real time or cost-sensitive applications. In some situations, designers are not willing to squander computing resources for the sake of pro ..."
Abstract - Cited by 598 (37 self) - Add to MetaCart
Large grain data flow (LGDF) programming is natural and convenient for describing digital signal processing (DSP) systems, but its runtime overhead is costly in real time or cost-sensitive applications. In some situations, designers are not willing to squander computing resources for the sake

Ptolemy: A Framework for Simulating and Prototyping Heterogeneous Systems

by Joseph Buck, Soonhoi Ha, Edward A. Lee, David G. Messerschmitt , 1992
"... Ptolemy is an environment for simulation and prototyping of heterogeneous systems. It uses modern object-oriented software technology (C++) to model each subsystem in a natural and efficient manner, and to integrate these subsystems into a whole. Ptolemy encompasses practically all aspects of design ..."
Abstract - Cited by 571 (89 self) - Add to MetaCart
of designing signal processing and communications systems, ranging from algorithms and communication strategies, simulation, hardware and software design, parallel computing, and generating real-time prototypes. To accommodate this breadth, Ptolemy must support a plethora of widely-differing design styles

Receiver-driven Layered Multicast

by Steven McCanne, Van Jacobson, Martin Vetterli , 1996
"... State of the art, real-time, rate-adaptive, multimedia applications adjust their transmission rate to match the available network capacity. Unfortunately, this source-based rate-adaptation performs poorly in a heterogeneous multicast environment because there is no single target rate — the conflicti ..."
Abstract - Cited by 737 (22 self) - Add to MetaCart
State of the art, real-time, rate-adaptive, multimedia applications adjust their transmission rate to match the available network capacity. Unfortunately, this source-based rate-adaptation performs poorly in a heterogeneous multicast environment because there is no single target rate

Space-time block codes from orthogonal designs

by Vahid Tarokh, Hamid Jafarkhani, A. R. Calderbank - IEEE Trans. Inform. Theory , 1999
"... Abstract — We introduce space–time block coding, a new paradigm for communication over Rayleigh fading channels using multiple transmit antennas. Data is encoded using a space–time block code and the encoded data is split into � streams which are simultaneously transmitted using � transmit antennas. ..."
Abstract - Cited by 1524 (42 self) - Add to MetaCart
of the space–time block code and gives a maximum-likelihood decoding algorithm which is based only on linear processing at the receiver. Space–time block codes are designed to achieve the maximum diversity order for a given number of transmit and receive antennas subject to the constraint of having a simple

Clustering by passing messages between data points

by Brendan J. Frey, Delbert Dueck - Science , 2007
"... Clustering data by identifying a subset of representative examples is important for processing sensory signals and detecting patterns in data. Such “exemplars ” can be found by randomly choosing an initial subset of data points and then iteratively refining it, but this works well only if that initi ..."
Abstract - Cited by 696 (8 self) - Add to MetaCart
Clustering data by identifying a subset of representative examples is important for processing sensory signals and detecting patterns in data. Such “exemplars ” can be found by randomly choosing an initial subset of data points and then iteratively refining it, but this works well only

Secure spread spectrum watermarking for multimedia

by Ingemar J. Cox, Joe Kilian, F. Thomson Leighton, Talal Shamoon - IEEE TRANSACTIONS ON IMAGE PROCESSING , 1997
"... This paper presents a secure (tamper-resistant) algorithm for watermarking images, and a methodology for digital watermarking that may be generalized to audio, video, and multimedia data. We advocate that a watermark should be constructed as an independent and identically distributed (i.i.d.) Gauss ..."
Abstract - Cited by 1100 (10 self) - Add to MetaCart
.i.d.) Gaussian random vector that is imperceptibly inserted in a spread-spectrum-like fashion into the perceptually most significant spectral components of the data. We argue that insertion of a watermark under this regime makes the watermark robust to signal processing operations (such as lossy compression

Delay Management for Programmable Video Signal Processors

by Smeets Aarts Essink, M. L. G. Smeets, E. H. L. Aarts, G. Essink, E. A. Kock , 1997
"... We consider the problem of memory allocation for intermediate data in the mapping of video algorithms onto programmable video signal processors. The corresponding delay management problem is proved to be NP-hard. We present a solution strategy that decomposes the delay management problem into a dela ..."
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relevant video algorithms. Key words. Real-time video signal processing; combinatorial optimization; retiming; life-time analysis of variables; network flow; stream processing. 1 Introduction At Philips Research programmable video signal processors (VSPs) have been developed for real-time processing

Moving Target Classification and Tracking from Real-time Video

by Alan J. Lipton, Hironobu Fujiyoshi, Raju S. Patil , 1998
"... This paper describes an end-to-end method for extracting moving targets from a real-time video stream, classifying them into predefined categories according to imagebased properties, and then robustly tracking them. Moving targets are detected using the pixel wise difference between consecutive imag ..."
Abstract - Cited by 290 (6 self) - Add to MetaCart
This paper describes an end-to-end method for extracting moving targets from a real-time video stream, classifying them into predefined categories according to imagebased properties, and then robustly tracking them. Moving targets are detected using the pixel wise difference between consecutive

Speckle reduction of infrared image and its hardware realization

by Ni Guoqianga, Zhang Jiana, Chen Xiaomeia
"... Regarding to big black speckle and cell like stripes in the JR images of a IR observation system introduced by the assembly precision, environment, the nonuniformity correction method and etc after correction of the images for nonuniformity, an adaptive algorithm of nonuniformity correction based on ..."
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on neural network is introduced in this paper. And a real-time video signal processing system based on DSP and programmable devices is described in this paper in detail. Experimented with the JR observation system, the algorithm is able to despeckle images adaptively and be real-time realized

Datapath Design for a VLIW Video Signal Processor

by Andrew Wolfe, Jason Fritts, Santanu Dutta, Edil S. T. Fern - in HPCA , 1997
"... This paper represents a design study of the datapath for a very long instruction word (VLIW) video signal processor (VSP). VLIW architectures provide high parallelism and excellent high-level language programmability, but require careful attention to VLSI and compiler design. Flexible, highbandwidth ..."
Abstract - Cited by 9 (4 self) - Add to MetaCart
, highbandwidth interconnect, high-connectivity register files, and fast cycle times are required to achieve real-time video signal processing. Parameterizable versions of key modules have been designed in a .25 process, allowing us to explore tradeoffs in the VLIW VSP design space. The designs target 33
Results 1 - 10 of 9,067