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A learning approach to semantic image analysis 06

A learning approach to semantic image analysis

引用

2nd International Conference on Mobile Multimedia Communications, MobiMedia '06

作者： Papadopoulos, G. Th Panagi, P. Dasiopoulou, S. Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Greece Informatics and Telematics Institute 1st Km Thermi-Panorama Road Thessaloniki GR-57001 Greece

ISBN: (纸本)9781595935175

In this paper, a learning approach coupling Support Vector Machines (SVMs) and a Genetic Algorithm (GA) is presented for knowledge-assisted semantic image analysis in specific domains. Explicitly defined domain knowledge under the proposed approach includes objects of the domain of interest and their spatial relations. SVMs are employed using low-level features to extract implicit information for each object of interest via training in order to provide an initial annotation of the image regions based solely on visual features. To account for the inherent visual information ambiguity, fuzzy spatial relations along with the previously computed initial annotations are supplied to a genetic algorithm, which decides on the globally most plausible annotation. Experiments with images of the beach vacation domain demonstrate the performance of the proposed approach. © 2006 ACM.

关键词： Object recognition

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Silicon-germanium saturable absorber mirrors for ultra-short pulse generation

Silicon-germanium saturable absorber mirrors for ultra-short...

引用

SiGe and Ge: Materials, processing, and Devices - 210th Electrochemical Society Meeting

作者： Kärtner, F.X. Byun, H. Grawert, F.J. Gopinath, J.T. Shen, H.M. Ippen, E.P. Akiyama, S. Liu, J. Wada, K. Kimerling, L.C. Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States Materials Processing Center Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 United States

ISBN: (纸本)1566775078

Silicon-Germanium saturable absorber mirrors are developed for laser mode locking. The fabrication process is fashioned such that a highly reflecting Si/SiO2 Bragg mirror with a crystalline absorber top-layer is generated. One step of wafer-bonding allows for subsequent epitaxial growth on the mirror. A six-pair reflector centered at 1400 nm with 99.8% peak reflectivity, a 99%-reflectivity bandwidth of 700 nm and a surface roughness of 0.136 nm is demonstrated. A thin Germanium layer is epitaxially deposited on the mirror surface to provide saturable absorption at 1550nm. with a sub-picosecond recovery time. The device is used to achieve stable, continuously modelocked operation of an Er-Yb:glass laser centered at 1540 nm, generating 220 fs pulses. Copyright The Electrochemical Society.

关键词： Mirrors

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Muli-Issue Multi-Threaded Stream Processor

Muli-Issue Multi-Threaded Stream Processor

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Somayeh Sardashti Hamid Reza Ghasemi Omid Fatemi Multimedia Processing Laboratory Department of Electrical and Computer Engineering University of Tehran Tehran Iran

The MISP processor is a programmable media processor which supports multi-issuing, multi-threading and stream processing techniques. MISP executes applications that have been mapped to the stream programming model. The stream model decomposes applications into a set of computation kernels that operate on data streams. This mapping exposes the inherent locality and parallelisms in media applications. MISP exploits thread level (TLP), data level (DLP), sub-word (SP) and instruction level (ILP) parallelisms inherent in media applications. Full simulator of MISP has been implemented and several media workloads composed of EEMBC benchmarks have been applied. Also we applied test programs on imagine stream processor. The simulation results show MISP gains IPC of more than 2.08 times and performance of more than 1.86 times over imagine. The synthesis results show area overhead per thread addition in MISP is about 7% without changing clock frequency

关键词： Streaming media parallel processing Yarn Multithreading computer architecture Kernel Application software VLIW Concurrent computing Clocks

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SPC10-4: EM Algorithm for Multiple Wideband Source Localization

SPC10-4: EM Algorithm for Multiple Wideband Source Localizat...

引用

IEEE Globecom 2006

作者： Kiran K. Mada Hsiao-Chun Wu Communications and Signal Processing Laboratory Department of Electrical and Computer Engineering Louisiana State University USA

A computationally efficient algorithm for multiple source localization, using the expectation-maximization (EM) algorithm, for the wideband sources in the near field of a sensor array/area, is presented. The basic idea is to decompose the observed sensor data, which is a superimposition of multiple sources, into individual components in the frequency domain and then estimate the corresponding location parameters associated with each component separately. Instead of the conventional alternating projection method, we propose to adopt the EM algorithm in this paper; our method involves two steps, namely Expectation (E-step) and Maximization (M-step). In the E-step, the individual incident source waveforms are estimated. Then, in the M-step, the maximum likelihood estimates of the source location parameters are obtained. These two steps are executed iteratively and alternatively until the pre-defined convergence is reached. The computational complexity comparison between our proposed EM algorithm and the existing alternating projection scheme is investigated. It is shown through Monte Carlo simulations that the computational complexity of the proposed EM algorithm is significantly lower than that of the conventional alternating projection algorithm.

关键词： Wideband Sensor arrays Iterative algorithms Computational complexity Frequency domain analysis Frequency estimation Maximum likelihood estimation Position measurement Convergence Projection algorithms

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Super-resolution in the presence of space-variant blur

Super-resolution in the presence of space-variant blur

引用

International Conference on Pattern Recognition

作者： K.V. Suresh A.N. Rajagopalan Image Processing and Computer Vision Laboratory Department of Electrical Engineering IIT Madras Chennai India

An efficient algorithm using maximum a posteriori-Markov random field (MAP-MRF) based approach for recovering a high-resolution image from multiple sub-pixel shifted low-resolution images is proposed. The algorithm can be used for super-resolution of both space-invariant and space-variant blurred images. We prove an important theorem that the posterior is also Markov and derive the exact posterior neighborhood structure in the presence of warping, blurring and down-sampling operations. The posterior being Markov enables us to perform all matrix operations as local image domain operations thereby resulting in a considerable speedup. Experimental results are given to demonstrate the effectiveness of our method

关键词： Spatial resolution Image resolution Cameras Image processing computer vision Laboratories Layout Frequency domain analysis Markov random fields Reconstruction algorithms

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An Adaptive Quality of Service Based Scheduling Algorithm for Wide Area Large Scale Problems

An Adaptive Quality of Service Based Scheduling Algorithm fo...

引用

IEEE International Symposium on Network Computing and Applications

作者： W. Lozano W. Rivera Parallel and Distributed Computing Laboratory Electrical and Computer Engineering Department University of Puerto Rico MayagÜez Puerto Rico

This paper explores the problem of dynamically scheduling large scale applications over wide area networks and then proposes an adaptive scheduling algorithm to provide quality of service. Our adaptive algorithm takes into account unexpected events and priority fluctuations and gives high priority to jobs with low probability of failure. Experimental results show that the new approach outperforms traditional scheduling approaches in grid computing environments

关键词： Quality of service Scheduling algorithm Large-scale systems Dynamic scheduling Wide area networks Adaptive scheduling Adaptive algorithm Fluctuations Processor scheduling Grid computing

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Using Grid Computing to Enable Distributed Radar Data Retrieval and processing

Using Grid Computing to Enable Distributed Radar Data Retrie...

引用

IEEE International Conference on parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： Diego Arias Wilson Rivera Parallel and Distributed Computing Laboratory Electrical and Computer Engineering Department University of Puerto Rico MayagÜez Puerto Rico

We describe a tool that implements a set of services to manipulate and store data from a radar network in a transparent way to end users. A major requirement of this system is data availability and reliability. Consequently, we have implemented a redundancy schema based on the information dispersal algorithm (IDA). Preliminary results show that the IDA based replication provides better reliability and less storage spending than traditional replication

关键词： Grid computing Radar Information retrieval Atmosphere Earth Distributed computing computer networks Concurrent computing Reliability engineering Availability

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The Robot Software Communications Architecture (RSCA): Embedded middleware for networked service robots 20

The Robot Software Communications Architecture (RSCA): Embed...

引用

20th IEEE International parallel and Distributed processing Symposium, IPDPS 2006

作者： Hong, Seongsoo Lee, Jaesoo Eom, Hyeonsang Jeon, Gwangil Real-Time Operating Systems Laboratory School of Electrical Engineering and Computer Science Seoul National University Seoul 151-744 Korea Republic of Distributed Information Processing Laboratory School of Computer Science and Computer Engineering Seoul National University Seoul 151-744 Korea Republic of Department of Computer Engineering Korea Polytechnic University 2121 Jungwang-Dong Siheung-Si Gyunggi-Do 429-793 Korea Republic of

ISBN: (纸本)1424400546

In this paper, we present a robot middleware technology named Robot Software Communications Architecture (RSCA) for its use in networked home service robots. The RSCA provides a standard operating environment for the robot applications together with a framework that expedites the development of such applications. The operating environment is comprised of a real-time operating system, a communication middleware, and a deployment middleware. Particularly, the deployment middleware supports the reconfiguration of component-based robot applications including installation, creation, start, stop, tear-down, and un-installation, In designing RSCA, we have adopted a middleware called SCA from the software defined radio domain and extend it since the original SCA lacks the real-time guarantees and appropriate event services. We have fully implemented RSCA and performed measurements to quantify its run-time performance. Our implementation clearly shows the viability of RSCA. © 2006 IEEE.

关键词： Middleware

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Web Document Image Retrieval System Based on Word Spotting

Web Document Image Retrieval System Based on Word Spotting

引用

IEEE International Conference on Image processing

作者： K. Zagoris N. Papamarkos C. Chamzas Image Processing and Multimedia Laboratory Department of Electrical & Computer Engineering Democritus University of Thrace Xanthi Greece

Nowadays, the huge non-indexing quantities of image archives (especially document images) require the development of intelligent tools for their retrieval with convenience comparable of the texts search engines. The proposed technique addresses the document retrieval problem by a word matching procedure. It performs matching directly in the images bypassing OCR and using word-images as queries. It is constituted of two different parts: The offline and the online operation. In the offline operation, the archive of document images is examined and the results are stored in a database. The online operation consists of the Web interface, the creation of the word's image and finally, the matching stage. The proposed matching process it can be described shortly as a two-threshold rating system. Finally, the proposed system has been build and it can be found in at the Web address: http://***/irs2.

关键词： Image retrieval Image databases Search engines Optical character recognition software Information retrieval Feature extraction Spatial databases Image processing Multimedia systems Laboratories

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AN EFFICIENT REPRESENTATION OF DIGITAL CURVES WITH LINE SEGMENTS AND ELLIPTICAL ARCS

AN EFFICIENT REPRESENTATION OF DIGITAL CURVES WITH LINE SEGM...

引用

2006 IET International Conference on Visual Information engineering

作者： C. Paramanand A.N. Rajagopalan Department of Electrical Engineering Image Processing and Computer Vision Laboratory Indian Institute of Technology Chennai India

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