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IEEE National Conference on Radar

作者： T.B. Hale M.A. Temple J.F. Raquet M.E. Oxley M.C. Wicks Dept of Electrical and Computer Engineering (AFIT/ENG) Air Force Institute of Technology OH Dept of Mathematics and Statistics (AFIT/ENC) Air Force Institute of Technology OH Department of Mathematics and Statistics (AFIT/ENC) Air Force Institute of Technology OH USA Sensors Directorate Radar Signal Processing Branch (AFRL/SNRT) Air Force Research Laboratory Rome NY

ISBN: (纸本)078037357X

The research applies space-time adaptive processing (STAP) techniques to a pseudo-circular array generated by selectively thinning a rectangular array. A hybrid approach incorporating elevation interferometry and STAP techniques is used. Results show the thinned 16-element pseudo-circular array offers significant detection performance improvement over the baseline factored time-space (FTS) technique operating on a linear array, e.g., an 8-element horizontal linear array. Results are demonstrated for cases with and without range ambiguous clutter. This performance level is achieved using a factor of M less sample support than required for full adaptivity where M represents the number of pulses within a coherent processing interval.

关键词： Planar arrays Sensor arrays Clutter Force sensors Adaptive arrays Degradation Filtering Military computing Mathematics Statistics

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Management of end-to-end security in collaborative IP network environments 7

Management of end-to-end security in collaborative IP networ...

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7th IEEE/IFIP International Symposium on Integrated Network Management, IM 2001

作者： Sivasubramanian, B. Sundareshan, M.K. Information Processing and Decision Systems Laboratory Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721-0104 United States

ISBN: (纸本)0780367197

Growth in popularity of the Internet has spawned a great interest in collaborative IP networks that support collaborative meetings between individuals or groups located at remote stations. The emphasis on security of information transfer during these meetings has made the management of end-to-end security in collaborative IP network environments, that may involve the creation of ad hoc communication networks that contain the Internet as an intermediate network, an important research issue. Addition of security features through standard methods gives rise to complex incompatibility problems resulting from the specific routing and address translation schemes that may be in place in these networks. The development of enhanced protocols that remove this incompatibility and ensure interoperability between security functions and address translation functions is discussed in this paper. Detailed steps in ensuring end-to-end security in various cases involving change of IP address, change of both IP address and the port, and the use of encapsulation security payload implemented in transport mode are described. The enhanced protocols presented here support generic implementation in the sense that the implementation of the security-related protocol is transparent to the use or not of the address translation scheme. For providing a proof of concept demonstration of the proposed solutions, the structure of a prototype collaborative network, which employs the Internet as an intermediate communication medium for supporting videoconferencing between remote stations, is outlined. © 2001 IEEE.

关键词： Environmental management

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Considering the alternatives in low-power design

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IEEE Circuits and Devices Magazine 2001年第4期17卷 23-29页

作者： Stouraitis, T. Paliouras, V. Department of Electrical and Computer Engineering University of Patras Greece IEEE Circuits and Systems Society Technical Committee on VLSI Systems and Applications Digital Signal Processing and the Multimedia Systems Committees United States VLSI Design Laboratory ECE Dept. University of Patras Greece Computer Engineering and Informatics Department University of Patras Greece ACM SIAM Technical Chamber of Greece Greece

Recent advances in computer arithmetic offer interesting alternative solutions for low-power design. Depending on an assortment of factors that need to be considered, it is worth evaluating the logarithmic number system (LNS) or the residue number system (RNS) for hardware implementations of computationally intensive tasks. As such, the choice of arithmetic can lead to substantial power savings.

关键词： Integrated circuit layout

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Robust layered coding of video for transmission over noisy channels

Robust layered coding of video for transmission over noisy c...

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2001 IEEE International Symposium on Circuits and Systems, ISCAS 2001

作者： Boulgouris, Nikolaos V Leontaris, Athaizasios Thomos, Nikolaos Strintzis, Michael G. Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki 54006 Greece Informatics and Telematics Institute 1 Kyvernidou str. Thessaloniki 546 39 Greece

ISBN: (纸本)0780366859

A novel robust scheme is presented, for the efficient transmission of image sequences over unreliable channels. The proposed scheme is based on an efficient error-resilient wavelet video coder and is able to produce embedded bitstreams. The robust coder is evaluated for the transmission of image sequences over binary symmetric channels and is shown to have very promising performance. © 2001 IEEE.

关键词： Video signal processing

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A rate-distortion optimal video pre-processing algorithm

A rate-distortion optimal video pre-processing algorithm

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IEEE International Conference on Image processing

作者： P.V. Karunaratne C.A. Segall A.K. Katsaggelos Image and Video Processing Laboratory Department of Electrical and Computer Engineering Northwestern University Evanston IL USA

Pre-processing algorithms improve the quality of a compression system by removing unimportant data before encoding. This enhances both the visual quality and coding efficiency of the system. We cast the pre-processing problem in the operational rate-distortion framework. Filtering the displaced frame difference is the focus, and the proposed method couples the choice of the quantization scale to the response of the prefilter. Coding errors are then addressed by penalizing significant differences between coded blocks. Finally, experimental results illustrate the efficacy of the method within the context of an MPEG-2 coding scenario.

关键词： Rate-distortion Low pass filters Image coding Decoding Transform coding Video compression Focusing Image quality Filtering algorithms Image sequences

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Robust algorithm for watermark recovery from cropped speech

Robust algorithm for watermark recovery from cropped speech

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

作者： A. Gurijala J.R. Deller Speech Processing Laboratory Department of Electrical & Computer Engineering Michigan State University East Lansing MI USA

Most digital watermarking techniques are susceptible to damage by data cropping. Although the effects of cropping might not be perceptible, watermark recovery may be rendered difficult or impossible due to the desynchronization of the recovery process. The transform encryption coding (TEC) based watermarking algorithm was presented at ICASSP 2000 (see Ruiz, F.J. and Deller, J.R., Jr, IEEE International Conference on Acoustics, Speech and Signal processing 2000). This paper investigates the performance of TEC watermarking in the presence of cropping, and presents an algorithm that identifies cropped samples and recovers watermarks from the damaged record. Implementation details and experimental results under different environmental conditions are presented.

关键词： Robustness Watermarking Cryptography Speech processing Security Filters Costs Energy measurement Gain measurement Signal processing

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Management of end-to-end security in collaborative IP network environments

Management of end-to-end security in collaborative IP networ...

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IFIP/IEEE International Symposium on Integrated Network Management

作者： B. Sivasubramanian M.K. Sundareshan Information Processing & Decision Systems Laboratory Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

ISBN: (纸本)0780367197

关键词： Collaboration IP networks Information security Protocols Environmental management Communication networks Encapsulation Payloads Prototypes Collaborative work

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Region-based color image indexing and retrieval

Region-based color image indexing and retrieval

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IEEE International Conference on Image processing

作者： I. Kompatsiaris E. Triantafillou M.G. Strintzis Informatics and Telematics Institute Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

A region-based color image indexing and retrieval algorithm is presented. As a basis for the indexing, a novel K-Means segmentation algorithm is used, modified so as to take into account the coherence of the regions. A new color distance is also defined for this algorithm. Based on the extracted regions, characteristic features are estimated using color, texture and shape information. An important and unique aspect of the algorithm is that, in the context of similarity-based querying, the user is allowed to view the internal representation of the submitted image and the query results. Experimental results demonstrate the performance of the algorithm. The development of an intelligent image content-based search engine for the World-Wide Web is also presented, as a direct application of the presented algorithm.

关键词： Color Indexing Image retrieval Information retrieval Image segmentation Data mining Feature extraction Shape Search engines Web sites

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Robust layered coding of video for transmission over noisy channels

Robust layered coding of video for transmission over noisy c...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： N.V. Boulgouris A. Leontaris N. Thomos M.G. Strintzis Informatics and Telematics Institute Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

ISBN: (纸本)0780366859

关键词： Robustness Motion compensation Decoding Image reconstruction Image sequences Source coding Error correction codes Motion estimation Laboratories Informatics

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A compound Bayes test for detection of occlusion and visible background and foreground areas in stereo

A compound Bayes test for detection of occlusion and visible...

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International Workshop on Digital and Computational Video (DCV)

作者： G.A. Triantafyllidis D. Tzovaras M.G. Strintzis Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Informatics and Telematics Institute Thessaloniki Greece

ISBN: (纸本)0769511104

An efficient technique based on the Bayes test is introduced in this paper, for the identification of the occlusion and visible background and foreground areas in a noisy stereoscopic image pair. Four hypotheses are used for the formulation of compound Bayes decision rules. Experimental results illustrating the performance of the proposed techniques are presented and evaluated.

关键词： Testing Pixel Gaussian noise Additive white noise Stereo vision Cameras Information processing Laboratories Background noise Data compression

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