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iee colloquium on Application of Fractal Techniques in image processing

作者： L.F. Jardine I.R. Whitworth Royal Military College of Science Shrivenham UK Rloyal Military College of Sicence Shrivenham UK

The fractal model is used as the basis of a texture analysis and synthesis technique for use on perceived visual texture in natural scenes of vegetation. Preliminary studies found that natural scenes depart from the fractal model. The model is adapted to allow for deviation between perceived natural visual texture and true fractals. The texture generator is used to synthesize natural visual texture. A transputer array is used for fast parallel analysis of the perceived visual texture of natural scenes for robot vision.< >

关键词： Computer graphics Machine vision image processing Fractals parallel architectures Microprocessors

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The measurement and production control of woven mesh

The measurement and production control of woven mesh

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iee colloquium on parallel processing in Control - the Transputer and Other architectures

作者： G.S. Virk P.W. Wood I.D. Durkacz Department of Control Engineering University of Sheffield Sheffield UK Dept. of Control Eng. Sheffield Univ. UK

In the weaving industry a variety of meshes are manufactured, using both metallic and nonmetallic materials, for a wide variety of filtration applications. At present the quality of the mesh is monitored at several stages of the manufacturing process to keep selected parameters within specified limits. This involves stopping the process approximately every half hour, manually assessing the mesh quality, and taking remedial action as necessary. There is a need to replace these manual checks with an automatic system that can continually monitor the mesh as it is being manufactured and, with appropriate actuators, control the loom on-line. The authors present initial results of research being conducted at Sheffield University to develop such a system for wire mesh. Early experiments proved that a contact measurement technique is inappropriate due to the severe vibrations and backlash nonlinearities present in most looms. The approach adopted here therefore, is to use image processing techniques. The instrument is transputer based so that the image processing can be performed on several processors to achieve the real-time performance necessary for on-line monitoring and control purposes.< >

关键词： image processing Industrial control Textile industry

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A scalable multiple-SIMD architecture for real-time image understanding

A scalable multiple-SIMD architecture for real-time image un...

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iee colloquium on Role of image processing in Defence and Military Electronics

作者： T.J. Atherton G.R. Nudd N.D. Francis D.J. Kerbyson R.A. Packwood G.J.B. Vaudin VLSI Architectures Group Department of Computer Science University of Warwick Coventry UK

The Warwick Pyramid Machine (WPM) is an M-SIMD (multiple-single instruction multiple data) heterogeneous pyramid architecture for real-time image understanding. SIMD (single instruction multiple data) machines are appropriate for the early stages of image processing. Subsequent numeric and symbolic processing makes poor use of an SIMD array, and is more suited to one or more conventional processors. Multiple-SIMD architectures divide an SIMD array into smaller sub-arrays, or clusters. Clusters may operate in synchrony, or autonomously. In the Warwick M-SIMD architecture each cluster consists of a small SIMD array, a controller, and a conventional microprocessor. The controller and the SIMD array may be considered as a single processor with a conventional ALU (arithmetic logic unit) and register structure, but with the addition of an array ALU with array registers. The conventional microprocessors form an MIMD (multiple instruction multiple data) array. Clusters may be configured to meet the real-time, or other, constraints of an application.< >

关键词： image processing Microcomputer applications Military computing parallel architectures parallel machines Real time systems

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Perspective view generation from digital map databases

Perspective view generation from digital map databases

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iee colloquium on Realistic 3-D image Synthesis

作者： H.C. Webber Majesty's Stationery office Worcestershire UK

The generation of perspective views of 3D surfaces obtained from predetermined view points is a complex and computationaly expensive task requiring the storage, manipulation and transformation of large amounts of data. At present there are a number of conventional algorithms which take digital surface data and process it to produce such images. Current algorithms are inherently sequential and do not, in general, map easily onto parallel processor architectures. This paper describes an algorithm which exploits the data independent nature of the calculations for individual pixel columns of the image and describes how this algorithm can be efficiently mapped onto an array of processors. Using an inherently parallel algorithm perspective views can be produced many times faster and therefore can be used for new applications.< >

关键词： Computer graphics image processing parallel processing

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The design and application of a fast fuzzy automata machine

The design and application of a fast fuzzy automata machine

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iee colloquium on VLSI Signal processing architectures

作者： R.W. Taylor P.A. Barrett S.J. Klyne Department of Electronics Adaptive Systems Engineering Group University of York York UK

The York Probabilistic Automata Machine is a video rate 256 cube Automata Array. The system has been developed primarily in ASIC based components, with the bulk of processing performed through a set of overlapped pipelines. Physical connectivity is limited to 128 nodes (in three dimensions), although higher 'virtual connectivities' are possible. Individual operations permitted at cellular level include binary and 'fuzzy' logic, plus simple weighted arithmetic. To complement the processor configuration, high bandwidth I/O and display units are currently under development, allowing arbitrary mappings of data I/O onto three dimensional surfaces within the unit. This paper introduces the York PAM and develops the application of virtual connectivity in automata like systems for massively parallel computation. The design and implementation of the individual processing element are presented, and the design of the three dimensional video re-sequencer discussed. Finally the use of probabilistic automata for the presentation of high level image data and facial recognition through neural techniques are presented.< >

关键词： Finite automata Fuzzy logic parallel architectures Pipeline processing

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Visualisation from digital map databases using transputers

Visualisation from digital map databases using transputers

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iee colloquium on Transputer and Signal processing

作者： H.C. Webber K.J. Palmer RSRE Malvern Malvern Worcestershire UK

An ever increasing amount of map data for the world's land masses is held in digital format. The computational demands of producing images in an acceptable time can be met by using high performance and low cost parallel processing machines so that new algorithms can be rapidly prototyped and tested. Such an approach has been made feasible by the use of transputer systems. There are a number of conventional algorithms which take digital surface data and process it to produce the required images. Most current algorithms are inherently sequential and do not, in general, map easily onto parallel processor architectures. The authors show that by careful algorithm design the problem can be mapped onto a number of processors by exploiting the fact that a calculation for one area is not dependent on any other data manipulations other than its own and hence can proceed independently. The algorithm is based on ray casting.< >

关键词： image processing Database management systems parallel algorithms parallel machines Microprocessors

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parallel VLSI ALGORITHM FOR STABLE INVERSION OF DENSE MATRICES

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iee proceedings-E COMPUTERS AND DIGITAL TECHNIQUES 1989年第6期136卷 575-580页

作者： ELAMAWY, A DHARMARAJAN, KR Department of Electrical and Computer Engineering Louisiana State University Baton Rouge USA

A fast, efficient, parallel algorithm for stable matrix inversion based on Givens plane rotations is described. The algorithm is implemented on VLSI systolic architecture that is capable of inverting anyn×nnonsingular dense matrix in 5nunits of time, including I/O time. The array architecture consists ofn2+nprocessing elements (PEs) arranged as a cascade of two triangular arrays of (n2+n)/2 PEs each. The parallel algorithm involves the following processes:QR-decomposition by the Givens rotations technique; inversion of the upper triangular matrixRand multiplication ofR−1byQ. All three components of the algorithm are maximally overlapped with no need for intermediate I/O or global communications. A novel technique for concurrently inverting distinct matrices on the same array has also been suggested. This technique, based on the use of two levels of pipelining, significantly improves the array throughput. The execution speed of the algorithm matches that of the fastest systolic implementation of matrix inversion using Gaussian elimination without pivoting (which is unstable in most cases) reported to date.

关键词： Computer architecture Microprocessor chips Microprocessors and microcomputers cascade execution speed VLSI systolic architecture stable matrix inversion multiplication matrix algebra QR-decomposition upper triangular matrix nonsingular dense matrix parallel algorithms pipelining parallel architectures array throughput microprocessor chips Computer vision and image processing techniques Linear algebra (numerical analysis) triangular arrays VLSI Givens plane rotations

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Third International Conference on image processing and its Applications

Third International Conference on Image Processing and its A...

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Third International Conference on image processing and its Applications

This conference proceedings contains 142 papers. The topics covered are interpretation/recognition;parallel processing;industrial applications;video;medical applications;segmentation and tracking;architectures;edges;f... 详细信息

关键词： image processing

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HIGHLY parallel PROCESSORS IN MILITARY SYSTEMS

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iee proceedings-E COMPUTERS AND DIGITAL TECHNIQUES 1988年第4期135卷 202-207页

作者： ROBERTS, JBG MERRIFIELD, BC SIMPSON, P WARD, JS Royal Signals and Radar Establishment Malvern UK

parallelism has found its way into programmable processors as well as dedicated engines such as FFT and digital filters. However, choices of machine architecture are still open. We have evaluated two contrasting types to test their versatility and to compare their performance on algorithms related to military applications. Fine-grain SIMD, and coarse-grain MIMD machines (Mil-DAP and Transputer arrays) have been applied to a spectrum of problems including FFT, two-dimensional operators, associative processing, linear assignment, sorting, dynamic programming and ray tracing. These relate to military needs in spectrum analysis and image correlation, feature extraction from images, ESM, tracking with netted radars, speech recognition and terrain intervisibility. Possibilities for parallelism in combat simulators are also being examined. Each type of processor has been proved versatile and much more powerful than conventional sequential machines. DAP has the advantage on regular low precision algorithms, and on assignment and sorting operations where scatter, gather and shift operations are important. Transputer arrays will (when the T800 version is available) offer a better capability for floating point arithmetic and less regular tasks. The chief conclusion is that both architectures are extremely versatile and VLSIcompatible, and that choices between them will more often hinge on the cost of a minimal system, the quality of the development software and the portability of code, rather than on the fundamental properties of the machine topology.

关键词： Computer architecture associative processing floating point arithmetic military systems speech recognition MilDAP terrain intervisibility sorting Military administration tracking Multiprocessing systems FFT fine-grain SIMD dynamic programming image correlation Transputer arrays feature extraction two-dimensional operators linear assignment ray tracing military computing ESM spectrum analysis coarse-grain MIMD highly parallel processors parallel processing

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colloquium ON image processing ACTIVITIES WITHIN THE ALVEY PROGRAMME.

COLLOQUIUM ON IMAGE PROCESSING ACTIVITIES WITHIN THE ALVEY P...

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colloquium on image processing Activities Within the Alvey Programme.

作者： Anon

This colloquium proceedings contains 4 papers. The topics covered are: the Alvey programme;computer vision;adaptive networks in artificial vision;and image parallel processing through processor arrays.

关键词： image processing

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