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Real time video distribution using publication through a database

Real time video distribution using publication through a dat...

引用

Brazilian Symposium on computer Graphics and Image processing (SIBGRAPI)

作者： I. Diamantis A. Ntalakas M.G. Strintzis IPL-Information Processing Laboratory Electrical & Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

We describe an interactive video-on-demand (VoD) service, which supports VCR-like functions. It consists of two parts. The first part is a database, which contains the information concerning the videos. This information is published on an Intranet Web. The second part is the actual video distribution using the client server model. The architecture combines network manipulation of high level and a modular system of pluggable components which provides adjustability to the needs of the user.

关键词： Databases Network servers Application software Web server File servers IP networks Costs Workstations Access protocols Watches

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Vector set partitioning with classified successive refinement VQ for embedded wavelet image coding

Vector set partitioning with classified successive refinemen...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： D. Mukherjee S.K. Mitra Image Processing Laboratory Department of Electrical & Computer Engineering University of California Santa Barbara CA USA

Set Partitioning in Hierarchical Trees (SPIHT), proposed by Said and Pearlman [1996], is generally regarded as a very efficient wavelet-based still image compression scheme. The algorithm uses an efficient, joint scanning and bit-allocation mechanism for quantizing the scalar wavelet coefficients, and produces a perfectly embedded bitstream. This work extends set partitioning to scan vectors of wavelet coefficients, and uses successive refinement VQ techniques such as multistage and tree-structured VQ, to quantize several wavelet coefficients at once. The new scheme is named VSPIHT (Vector SPIHT). Coding results are presented to demonstrate that the vector-based approach (without arithmetic coding) surpasses the scalar counterpart (also without arithmetic coding), in the mean-squared-error sense, for most images at low bitrates. The superiority of the vector-based approach is more pronounced for images that are generally regarded as difficult to code (such as Barbara) because of a large amount of detail.

关键词： Image coding Wavelet coefficients Quantization Frequency Arithmetic Filters Decoding Bit rate Image processing Laboratories

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Maternal ECG elimination and foetal ECG detection-comparison of several algorithms

Maternal ECG elimination and foetal ECG detection-comparison...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： A. Kam A. Cohen Signal Processing Laboratory Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Beersheba Israel

When trying to record a foetal ECG (FECG), one of the main problems is the interference from the maternal ECG (MECG). Three algorithms for eliminating maternal ECG are compared. Two adaptive filtering techniques, LMS (least mean square) and RLS (recursive least squares), are compared to a new algorithm that uses the blind source separation (BSS) theorem to separate the FECG from signals that are recorded with a lot of MECG interference. Simulation studies were first performed. Two independent ECG signals (sources) were simulated; one was considered as the MECG while the other was the FECG. By mixing the two sources with various channels, the algorithms were checked and compared. The algorithms were tested on real data as well as that taken from DAISY (the DAtabase for the Identification of SYstems). Conclusions concerning the mixing system were drawn both from the real data and from the simulation experiments.

关键词： Electrocardiography Interference Adaptive filters Least squares approximation Resonance light scattering Least squares methods Filtering algorithms Blind source separation Source separation System testing

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A system for human jaw modeling using intra-oral images

A system for human jaw modeling using intra-oral images

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： S.M. Yamany A.A. Farag Computer Vision and Image Processing Laboratory Department of Electrical Engineering University of Louisville Louisville KY USA

A novel integrated system is developed to obtain a record of the patient's occlusion using computer vision. Data acquisition is obtained using intra-oral video camera. A modified Shape from Shading (SFS) technique using perspective projection and camera calibration is then used to extract accurate 3D information from a sequence of 2D images of the jaw. A novel technique for 3D data registration using Grid Closest Point (GCP) transform and genetic algorithms (GA) is used to register the output of the SFS stage. Triangulization is then performed, and a solid 3D model is obtained via a rapid prototype machine. The overall purpose of this research is to develop a model-based vision system for orthodontics that will replace traditional approaches and can be used in diagnosis, treatment planning, surgical simulation and implant purposes.

关键词： Humans Cameras computer vision Data acquisition Shape Calibration Data mining Genetic algorithms Solid modeling Prototypes

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Cochannel signal separation in fading channels using a modified constant modulus array

Cochannel signal separation in fading channels using a modif...

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Asilomar Conference on Signals, Systems & computers

作者： S. Gummadi B.L. Evans Embedded Signal Processing Laboratory Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA

We convert a constant modulus (CM) array into a robust smart antenna by modifying the error criterion to be a weighted sum of conventional CM array error and decision-directed equalization error. The new error criterion enables the CM array to (1) separate digital cochannel signals with multipath and inter-symbol interference and (2) track fading signals. The key contribution is that the modified error criterion adds phase sensitivity to the otherwise phase insensitive CM error criterion. We present computer simulations to show the signal tracking properties of the CM array using the modified error criterion in a fading environment.

关键词： Source separation Fading computer errors Antenna arrays Adaptive arrays Laboratories Robustness Frequency Attenuation Least squares approximation

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Reconstruction of motion vector missing macroblocks in H.263 encoded video transmission over lossy networks

Reconstruction of motion vector missing macroblocks in H.263...

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IEEE International Conference on Image processing

作者： S. Shirani F. Kossentini R. Ward Signal Processing and Multimedia Laboratory Department of Electrical and Computer Engineering University of British Columbia Vancouver BC Canada

Errors caused by loss of coded data can seriously affect an H.263 decoded image sequence. Several scenarios may occur that include: (1) loss of macroblocks in I or P frames, and (2) loss of motion vectors of macroblocks in P frames. The missing macroblocks in I and P frames can be reasonably reconstructed by exploiting the correlation between adjacent macroblocks. Existing methods which reconstruct the motion vector of a macroblock rely on existing motion vectors of surrounding macroblocks, and the results are not always satisfactory. A novel reconstruction technique for restoration of macroblocks with missing motion vectors is proposed. This method exploits the image continuity inside and across the borders of the macroblocks. Simulation results indicate that the performance of the proposed algorithm is good, both subjectively and objectively.

关键词： Image reconstruction Decoding Image sequences Image restoration

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Reversible wavelet and spectral transforms for lossless compression of color images

引用

IEEE International Conference on Image processing

作者： N. Strobel S.K. Mitra B.S. Manjunath Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

ISBN: (纸本)0818688211

A new lossless image compression method for progressive-resolution transmission of color images is proposed. It is based on spatial and spectral transforms. Reversible wavelet transforms are performed across the red, green, and blue color components first. Then adaptive spectral transforms are applied to the associated color subbands. Simulation results indicate that the proposed algorithm can achieve bit rates that are about 20% lower than results obtained with comparable lossless image compression techniques supporting progressive-resolution transmission.

关键词： Wavelet transforms Image coding Color Decorrelation Signal resolution Propagation losses Image storage Signal processing Image processing Laboratories

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Adaptive heterodyne filters (AHF) for detection and attenuation of narrow band signals

Adaptive heterodyne filters (AHF) for detection and attenuat...

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

作者： K.E. Nelson M.A. Soderstrand Electrical and Computer Engineering Department Digital Signal Processing and Communications Laboratory USA University of California Davis CA USA

A fixed filter may be converted into an adaptive filter with a single adaptation parameter through the use of a new adaptive heterodyne filter (AHF) concept in which the frequency of the heterodyne signal is adjusted thereby translating the entire filter transfer function in frequency. If the fixed filter is selected to be a very narrow-band band-pass filter, the new AHF concept can be used very effectively in the elimination of narrow band interference in wide-band communications or control systems. A specific example of the removal of a slow-moving time-varying mechanical resonance from the control signal for a flight control system demonstrates the power of the new AHF concept.

关键词： Adaptive filters Attenuation Band pass filters Frequency conversion Narrowband Communication system control Control systems Transfer functions Interference elimination Wideband

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Nonlinear invariance: Cross-positive vector fields

Nonlinear invariance: Cross-positive vector fields

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1998 American Control Conference, ACC 1998

作者： Meyer, David G. Piatt, Teri L. Wadley, Haydn N.G. Vancheeswaran, Ravi Kosut, Robert Nonlinear and Real-Time Control Laboratory Electrical and Computer Engineering Department University of Colorado Boulder CO 80309-0425 United States Intelligent Processing of Materials Laboratory Materials Science and Engineering Department University of Virginia Charlottesville VA 22901 United States SC Solutions Inc. 3211 Scott Blvd. Santa Clara CA 95054 United States

ISBN: (纸本)0780345304

This paper introduces the concept of cross-positivity for vector fields and explores ramifications of cross-positivity relative to solutions of ordinary differential equations. The motivation is to understand the dynamic behavior of systems where the natural physics place constraints on the vector field. Our results extend to nonlinear systems several well-known results about properties of x = Ax when A satisfies special conditions. © 1998 AACC.

关键词： Ordinary differential equations

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An interference rejection approach to noise adjusted principal components transform

An interference rejection approach to noise adjusted princip...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Chein-I Chang Qian Du Remote Sensing Signal and Image processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD USA

ISBN: (纸本)0780344030

A signal-to-noise ratio based PCA approach, called maximum noise fraction (MNF) transformation or noise adjusted principal components (NAPC) transform PCA was previously developed to arrange principal components in decreasing order of image quality rather than data variance as done for PCA. One of major disadvantages of this approach is that the noise covariance matrix must be estimated accurately from the data a priori. Another is that the factor of interference is not taken into account in MNF or NAPC where the effect of interference tends to be more serious than noise in hyperspectral images. In this paper, these two problems are addressed by considering the interference as a separate unwanted signal source from which an interference rejection approach to noise adjusted principal components transform (IRNAPC) can be developed in a similar manner that the NAPC was derived. It is shown that if interference is taken care of properly, IRNAPC significantly improves NAPC. Additionally, interference annihilation also improves the estimation of the noise covariance matrix.

关键词： Signal to noise ratio Covariance matrix Principal component analysis Hyperspectral imaging Multispectral imaging Object detection Interference suppression Remote sensing Signal processing Image processing

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