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Fovea based coding for video streaming 1

International Conference on Image Analysis and Recognition, ICIAR 2004

作者： Dikici, Çağatay Bozma, H Isıl Civanlar, Reha Intelligent Systems Laboratory Electrical and Electronics Engineering Department Boğaziç University IstanbulBebek34342 Turkey Computer Engineering Department Koç University Istanbul34450 Turkey

ISBN: (数字)9783540301257

ISBN: (纸本)3540232230

Attentive robots, inspired by human-like vision – are required to have visual systems with fovea-periphery distinction and saccadic motion capability. Thus, each frame in the incoming image sequence has nonuniform sampling and consecutive saccadic images have temporal redundancy. In this paper, we propose a novel video coding and streaming algorithm for low bandwidth networks that exploits these two features simultaneously. Our experimental results reveal improved video streaming in applications like robotic teleoperation. Furthermore, since the algorithm employs the Gaussian-like resolution of human visual system and is extremely simple to integrate with the standard coding schemes, it can also be used in applications such as cellular phones with video. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Video streaming

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Hyperspectral texture classification using generalized Markov fields

Hyperspectral texture classification using generalized Marko...

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Conference on computer vision and Pattern Recognition (CVPR)

作者： S. Sarkar G. Healey Computer Vision Laboratory Department of Electrical Engineering and Computer Science University of California Irvine Irvine CA USA

We present a generalized random field model in a random environment to classify hyperspectral textures. The model generalizes traditional random field models by allowing the spatial interaction parameters of the field to be random variables. Principal component analysis is used to reduce the dimensionality of the data set to a small number of spectral bands that capture almost all of the energy in the original hyperspectral textures. Using the model we obtain a compact feature vector that efficiently computes within and between band information. Using a set of hyperspectral samples, we evaluate the performance of this model for classifying textures and compare the results with other approaches.

关键词： Hyperspectral imaging Hyperspectral sensors Image analysis Pixel computer vision Principal component analysis Image texture analysis Random variables Energy capture Gray-scale

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A novel SOM-based approach for active contour modeling

A novel SOM-based approach for active contour modeling

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Intelligent Sensors, Sensor Networks and Information Processing Conference (ISSNIP)

作者： Y.V. Venkatesh S.K. Raja N. Ramya Computer Vision Laboratory Department of Electrical Engineering Indian Institute of Science Bangalore India

We integrate the advantages of SOM- and snake-based ACMs in order to extract the desired contour from images. We employ: (i) the feature points to guide the contour, as in the case of SOM-based ACMs; (ii) the gradient and intensity variations in a local region to control the contour movement. However, in contrast with the snake-based ACMs, we do not use an explicit energy functional based on gradient or intensity. The algorithm is tested on synthetic binary and gray-level images, and the results show the superiority of the proposed algorithm over other conventional SOM- and snake-based ACM algorithms.

关键词： Active contours Neurons computer vision Image edge detection Deformable models Neural networks Laboratories Testing Joining processes Object detection

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Excitation of terahertz plasma oscillations in a field-effect heterostructure device by ultrashort optical pulses: Physics and modeling

Excitation of terahertz plasma oscillations in a field-effec...

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International Conference on Ultrafast Phenomena, UP 2004

作者： Ryzhii, V. Khmyrova, I. Ryzhii, M. Satou, A. Otsuji, T. Shur, M.S. Computer Solid State Physics Laboratory University of Aizu Aizu-Wakamatsu965-8580 Japan Department of Control Engineering and Science Kyushu Institute of Technology Iizuka820-8502 Japan Department of Electrical Computer and Systems Engineering Rcnssclaer Polytechnic Institute Troy12180 United States

We report on the proposal and modeling of a heterostructure device similar to a field-effect transistor using optical excitation of electron plasma oscillations and intended for generation of terahertz signals. ©... 详细信息

ISBN: (纸本)3540241108

关键词： Field effect transistors

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The case for mobile OLAP

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3268卷 405-414页

作者： Maniatis, Andreas S. National Technical University of Athens Department of Electrical and Computer Engineering Knowledge and Database Systems Laboratory Greece

On-Line Analytical Processing (OLAP) is a trend in database technology, based on the multidimensional view of data. Numerous applications and development environments exist, offering OLAP analysis to developers, analysts and end users. Further more, mobile devices find their way into almost all aspects of every day life, ranging from cellular phones with advanced capabilities (smart phones) for personal use to professional PDA's used for numerous wireless applications - OLAP included - and thus generating the need for convergence of the two technologies. In this paper we introduce the term Mobile OLAP to express the porting of requirements and specifications for OLAP applications into the wireless and mobile computing world. More specifically, we examine the requirements posed for OLAP visualization applications on mobile devices, both in terms of presentation and usability. We then proceed by investigating the state of the art of the broader wireless computing community, focusing in the specifications more close to OLAP. Finally, we demonstrate how a "lightweight" presentation model for OLAP can significantly contribute towards mobile OLAP. © Springer-Verlag 2004.

关键词： Specifications

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Performance guarantees in sensor networks

Performance guarantees in sensor networks

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： S. Venkatesh Y. Shi W.C. Karl Information Systems and Sciences Laboratory Electrical and Computer Engineering Department Boston University USA

The sensor network for monitoring distributed spatial phenomena has emerged as an area of significant practical interest. In this paper we investigate fundamental issues in detection of spatially distributed phenomena under communication constraints. The novelty of the paper is in providing a tradeoff between global performance and costs involved in communication. In particular we focus our attention on boundary estimation and develop a framework to optimize communication costs subject to worst-case misclassification guarantees. It is shown that the communication cost is primarily a function of two parameters: (1) length of the boundary; (2) overall misclassification error - which leads us to the conclusion that wireless sensor network performance is comparable to that obtained with a wired network of sensors.

关键词： Intelligent networks Wireless sensor networks Testing Sensor phenomena and characterization Cost function Power system control Uncertainty Information systems Laboratories computer networks

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S-band high power solid-state amplifier design and development

S-band high power solid-state amplifier design and developme...

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作者： Stratakos, Yorgos Betzios, Panayotis National Technical University Athens Greece Microwaves/Fiber Optics Laboratory Inst. of Commun./Computer Systems NTUA Greece Department of Electrical Engineering Natl. Technical University of Athens Greece

The design and development of a 230 W power amplifier operating at S-band (2,35 to 2.45 GHz) is described. The motivation behind this development is the need for a microwave driver amplifier to be used in the linear accelerator facility at the Institute of Accelerating systems and Applications at the University of Athens. It will replace the magnetron currently being used at low microwave power. The need for extremely stable microwave power for the electron beam pre-acceleration and chopping cavities makes it imperative to use a solid-state high power GaAs amplifier. The design technology uses microstrips, fabricated on RO4003 substrates, and special care has been taken to protect the amplifier from over temperature and overload. The amplifier is composed of three stages. The first is a MMIC and the other two use GaAs MESFETs. The amplifier also has forward and reflected signal indicators that can be used for remote amplifier control to shut it down if the VSWR is too high, for example, or to check the RF output level and provide automatic gain control. The amplifier was designed using a CAD program, which gave the flexibility to use robust optimizer tools for the complete design of the RF chain. Finally, test results are presented that show excellent agreement with the theoretical predictions.

关键词： Solid state devices

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Level set methods for dynamic tomography

Level set methods for dynamic tomography

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IEEE International Symposium on Biomedical Imaging

作者： Yonggang Shi W.C. Karl Information Systems and Sciences Laboratory Electrical and Computer Engineering Department Boston University USA

ISBN: (纸本)0780383885

In this paper, we propose a novel variational framework for the reconstruction of dynamic objects from sparse and noisy tomographic data. Using an object-based scene model, we developed a general object dynamic model based on a one to one and differentiable mapping. We then propose a novel distance between curves to incorporate the object dynamics into the variational framework. For the minimization of the energy function, we developed a coordinate descent algorithm based on the level set methods. Experimental results for reconstructing a sequence of multiple dynamic objects are presented.

关键词： Level set Tomography Image reconstruction Layout Biological system modeling Image sequences Nuclear medicine Inverse problems Pixel Information systems

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First step toward Internet based embedded control system

First step toward Internet based embedded control system

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Asian Control Conference

作者： E. Suwartadi C. Gunawan A. Setijadi C. Machbub Laboratory for Control and Computer Systems Department of Electrical Engineering Bandung Institute of Technology Indonesia

IP network has been evolving significantly in last decade. Many computers and devices have been attached to the IP network and many applications were taken place over it. One of interesting applications is building embedded control system which has connectivity to Internet. This paper explains an implementation of embedded web server with security support which becomes an example of control application over IP network. A security algorithm, TEA (tiny encryption algorithm), has been implemented in a microprocessor system together with TCP/IP stack. The microprocessor system is based on 8051 family microcontroller which serves as web server. The encryption algorithm is processed both on server and client. Therefore in clients need a plug in, which run encryption mechanism, so that they can access the embedded Web server safely.

关键词： Internet Control systems IP networks Application software Web server Cryptography Microprocessors computer networks TCPIP Microcontrollers

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Differentiable minimin shape distance for incorporating topological priors in biomedical imaging

Differentiable minimin shape distance for incorporating topo...

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IEEE International Symposium on Biomedical Imaging

作者： Yonggang Shi W.C. Karl Information Systems and Sciences Laboratory Electrical and Computer Engineering Department Boston University USA

ISBN: (纸本)0780383885

In the application of curve evolution and level set methods to biomedical image analysis, the incorporation of geometric priors for isolated shapes has been proved useful. On the other hand, the inclusion of a priori topological information concerning the relationship of multiple shapes remains a challenge. In this paper, we propose a differentiable minimin shape distance (DMSD) that is indicative of the topological relation between shapes. A curve evolution equation based on its first variation is derived and this enables us to incorporate this prior into a curve evolution framework. We demonstrate the application of the DMSD by proposing an extension to the Chan-Vese image segmentation model to incorporate topological prior information for challenging image segmentation tasks.

关键词： Biomedical imaging Shape measurement Level set Image segmentation Biomedical measurements Biomedical computing Image analysis Topology Information systems Laboratories

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