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IEEE Workshop on High Performance Switching and Routing

作者： R. Kurceren J.W. Modestino Electrical Computer and Systems Engineering Department and Center for Image Processing Research Rensselaer Polytechnic Institute Troy NY USA

ISBN: (纸本)0780367111

The use of forward error-control (FEC) coding has emerged as a promising approach for real-time transport over ATM networks for cell-loss recovery. The use of an FEC-based transport protocol over networks with bandwidth constraints, however, is not obvious since FEC coding introduces an overhead which can possibly cause additional cell losses which, furthermore, tend to occur in bursts. In this work, an overall performance evaluation of FEC coding is provided by incorporating the effects of channel coding on the cell-loss characteristics of the network. It is shown that FEC coding with proper selection of channel coding rate can significantly improve the throughput at a multiplexer even under correlated cell-loss situations. We also develop and illustrate an information-theoretic approach for incorporating the effects of FEC coding into well-established queueing theory calculations. This is achieved by solving separately the channel-coding problem for the modeled transmission channel and the queueing problem for the network. The performance of some specific coding designs are shown to approach the information-theoretic predictions with increasing complexity and/or delay.

关键词： Forward error correction image coding Transport protocols Channel coding Asynchronous transfer mode Systems engineering and theory Bandwidth Throughput Resource management computer networks

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Embedded image coding using zeroblocks of subband/wavelet coefficients and context modeling

Embedded image coding using zeroblocks of subband/wavelet co...

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Data Compression Conference (DCC)

作者： Shih-Ta Hsiang Center for Image Processing Research and Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

ISBN: (纸本)0769510310

In this paper, we present a new embedded wavelet image coding system using quadtree splitting and context modeling. It features low computational complexity and high compression efficiency, thanks to joint utilization of two powerful embedded coding techniques-set partitioning and context modeling. With effective exploitation of strong statistical dependencies among the quadtree nodes built up from subband coefficients, the proposed algorithm substantially improves the coding efficiency of the existing set-partition coders for both lossy and lossless image compression. For example, our experimental results show that the new algorithm respectively outperforms zerotree-based SPIHT and quadtree-based SPECK by 0.7 dB and 1.0 dB at 0.5 bpp on an average.

关键词： image coding Wavelet coefficients Context modeling Partitioning algorithms Transform coding image processing Embedded computing Power engineering computing Power engineering and energy Systems engineering and theory

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Transport of scalable video over CDMA wireless networks: a joint source coding and power control approach

Transport of scalable video over CDMA wireless networks: a j...

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IEEE International Conference on image processing

作者： Yee Sin Chan J.W. Modestino Center for Image Processing Research Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

We investigate the transport of scalable digital video over future third-generation (3G) wireless CDMA cellular systems By considering the resource requirements as the aggregate of the products of source coding rates and the energy per information bit to noise ratio, we propose a joint source coding and power control (JSCPC) scheme which simultaneously maximizes the quality of the delivered video while minimizing the total resource consumption. We demonstrate the efficacy of this approach using the ITU-T H.263+ video source coder, although the approach is generally applicable to other source coding schemes as well.

关键词： Multiaccess communication Wireless networks Source coding Power control Video compression Systems engineering and theory Streaming media Silicon compounds image processing Power engineering computing

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Multi-layered video transmission over wireless channels using an adaptive modulation and coding scheme

Multi-layered video transmission over wireless channels usin...

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IEEE International Conference on image processing

作者： Y. Pei J.W. Modestino Center for Image Processing Research Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

In this paper we describe a multi-layered video transport scheme for wireless channels capable of adapting to channel conditions in order to maximize end-to-end quality of service (QoS). This scheme combines a scalable H.263+ video source coder with unequal error protection (UEP) across layers. The UEP is achieved by employing different channel codes together with a multiresolution modulation approach to transport the different priority layers. Adaptivity to channel conditions is provided through use of joint source-channel coding (JSCC) which attempts to jointly optimize the source and channel coding rates together with the modulation parameters to obtain the maximum achievable end-to-end QoS for the prevailing channel conditions. Results indicate that this adaptive JSCC scheme employing scalable video encoding together with a multiresolution modulation/coding approach leads to significant improvements in delivered video quality for specified channel conditions. In particular, the approach results in considerably improved graceful degradation properties for decreasing channel SNR.

关键词： Modulation coding image coding Signal resolution Video coding Quality of service Constellation diagram Systems engineering and theory Error correction codes Channel coding Degradation

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Adaptive hierarchical stereo matching using object segmentation and window warping

Adaptive hierarchical stereo matching using object segmentat...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Jae-Chul Kim Byoung-Ho Kang Maeng-Sub Cho Color Imaging Research Team Image Processing Department Computer and Software Technology Laboratory Electronics and Telecommunications Research Institute Taejon South Korea

In this paper, we propose an adaptive stereo matching algorithm to encompass stereo matching problems in projective distortion region. Since the projective distortion region can not be estimated in terms of fixed-size block matching algorithm, we tried to use adaptive window warping method in hierarchical matching process to compensate the perspective distortions. In addition, probability theory was adopted to encompass uncertainty of disparity of points over the window in this study. The proposed stereo matching algorithm has been tested on both disparity map and 3D model view. The experimental results show that remarkable improvement is obtained in the projective distortion region.

关键词： Object segmentation Optical distortion Uncertainty Cameras Solid modeling Color image processing Laboratories Software algorithms Testing

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Real-time out-of-core visualization of particle traces

Real-time out-of-core visualization of particle traces

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IEEE Symposium on Parallel and Large-Data Visualization and graphics (PVG)

作者： R. Bruckschen F. Kuester B. Hamann K.I. Joy Visualization and Graphics Research Group Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA Visualization and Interactive Systems Group Department of Electrical and Computer Engineering University of California Irvine CA USA

ISBN: (纸本)0780372239

Visualization of particle traces provides intuitive and efficient means for the exploration and analysis of complex vector fields. The paper presents a method suitable for the real-time visualization of arbitrarily large time-varying vector fields in virtual environments. We describe an out-of-core scheme in which two distinct pre-processing and rendering components enable real-time data streaming and visualization. The presented approach yields low-latency application start-up times and small memory footprints. The described system was used to implement a "volumetric fog lance," which can emit up to 60000 particles into a flow field while maintaining an interactive frame rate of 60 frames per second. All algorithms were specifically designed to support commodity hardware. The proof-of-concept system is running on a low-cost Linux workstation equipped with a 120 GB E-IDE RAID (redundant array of inexpensive disk) system.

关键词： Data visualization Computational modeling Computational fluid dynamics Motion pictures Hardware computer graphics Interactive systems image processing computer science image analysis

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computer graphics in Germany

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computer graphics (ACM) 2001年第3期35卷 14-21页

作者： Saupe, Dietmar Alexa, Marc Chesnais, Alain Encarnação, Jose Institut für Informatik Universität Leipzig GRIS Technische Universität Darmstadt University of Leipzig Research Group on Computer Graphics and Image Processing Alias Wavefront 17 bis rue Joseph de Maistre 75018 Paris France Fraunhofer-Institut fuer Graphische Datenverarbeitung Wilhelminenstrasse 7 D-64283 Darmstadt Germany 3D Graphics Computing Department of Computer Science Technische Universität Darmstadt

The various institution and developments in the field of computer graphics in Germany is discussed. The German research Foundation( DFG), as recognition of research in computer graphics, sponsors a special interdisciplinary graduates study program on 3D image analysis and synthesis at the University of Erlangen-Nuremburg. The German Association for Informatics, founded in 1983, brings together about 40 representatives from Universities, colleges and industry that co-ordinate activities form five subgroups specializing in foundations and systems, imaging and visualization, graphical user interfaces, simulation and animation, and geometric modeling. Several companies and forums working in the area of computer graphics are situated in Darmstadt.

关键词： computer graphics

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Changes at multiple spatial scales 19

Changes at multiple spatial scales

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19th International Congress for Photogrammetry and Remote Sensing, ISPRS 2000

作者： Carvalho, Luis M.T. Fonseca, Leila M.G. Murtagh, Fionn Clevers, Jan G.P.W. Wageningen University Centre for Geo-Information Netherlands National Institute for Space Research Division of Image Processing Brazil Queen's University of Belfast School of Computer Science United Kingdom

Change detection on rasterized data is extremely dependent on accurate radiometric and geometric rectification. The development of processing tools able to minimise these requirements has been recognised since the late eighties. In the present paper we present a methodology for detecting changes on multidate satellite images with different radiometric and geometric characteristics via Multiresolution Wavelet Analysis. An area in south-eastern Brazil was chosen as case study. In the last 20 years the site was characterised by an increase of mining activities and deforestation. Landsat TM and MSS images from July 1981, November 1985 and August 1998 were used. The idea is to decompose a set of images into averages (overall pattern) and details images at different resolutions. image differences due to the effects of spatial misregistration, atmospheric condition and sensor characteristics are depicted across scales. No radiometric rectification was applied to the input images and the spatial misregistration ranged from one to three pixels. To detect deforestation and new mining areas we used details at the third and fourth scales. Deforested areas as well as new mining sites were successfully pinpointed without previous radiometric rectification or threshold definition while differences not related to land cover changes were bypassed. Misregistration effects and small area changes are depicted as fine details. Phenological characteristics, atmospheric effects and differences in sensor calibration are represented at coarser scale levels. Hence, using information from intermediate scale levels one can minimise the problems mentioned above. © 2000 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Wavelet transforms

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A spreadsheet interface for visualization exploration 00

A spreadsheet interface for visualization exploration

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Proceedings of the conference on Visualization '00

作者： T. J. Jankun-Kelly Kwan-Liu Ma Computer Science Department Visualization and Graphics Research Group. Center for Image Processing and Integrated Computing University of California Davis CA

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Embedded image coding using zeroblocks of subband/wavelet coefficients and context modeling

Embedded image coding using zeroblocks of subband/wavelet co...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Shih-Ta Hsiang J.W. Woods Center for Image Processing Research and Electrical Computerand Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

With fast computation and excellent compression efficiency, two embedded coding techniques, zero-tree/-block coding and context modeling of the subband/wavelet coefficients, have been widely utilized for image coding applications. In this research, we present a new embedded wavelet image coding algorithm with an attempt to combine advantages of these two successful coding schemes. The experimental results show that the proposed algorithm outperforms the respected zero-tree/-block coders, SPIHT and SPECK, in compression efficiency. It is also comparable to the state-of-art JPEG 2000 test coder in PSNR performance while retaining the attractive low-complexity feature of the zeroblock coders.

关键词： image coding Context modeling Discrete wavelet transforms Testing PSNR Arithmetic Partitioning algorithms image processing Systems engineering and theory Embedded computing

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