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An interference rejection-based radial basis function neural network for hyperspectral image classification

An interference rejection-based radial basis function neural...

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International Joint Conference on Neural Networks (IJCNN)

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

A new application for RBF neural networks in nonlinear mixed pixel classification for hyperspectral imaging is presented. It is a three-layer neural network with the input layer specified by spectral signatures of a mixed pixel vector, the hidden layer used for nonlinear mixing functions and the output layer used to produce classification results of the mixed pixel vector. A noise estimation method in conjunction with noise subspace projection is developed to reliably estimate the member of mixing materials plus interference signatures that can be used as the number of hidden nodes as well as the member of input nodes. The least-mean-square learning algorithm is applied to adjust parameters used in the hidden layer and weights of the output layers adaptively and simultaneously so as to achieve best possible performance. The performance is evaluated through a series of experiments via AVIRIS data. A comparative analysis is also conducted among various methods.

关键词： Interference Radial basis function networks Hyperspectral imaging Hyperspectral sensors Pixel Image classification Remote sensing Laboratories Image sensors Spectroscopy

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Superconducting processors for HTMT: issues and challenges

Superconducting processors for HTMT: issues and challenges

引用

Frontiers of Massively parallel Computation

作者： K.B. Theobald G.R. Gao T.L. Sterling Computer Architecture and Parallel Systems Laboratory Department of Electrical and Computer Engineering University of Delaware Newark DE USA NASA Jet Propulsion Laboratory /Center for Advanced Computing Research California Institute of Technology Pasadena CA USA

The Hybrid Technology Multi-Threading project is a long-term study of the feasibility of combining several emerging technologies to reach 1 petaFLOPS within ten years. HTMT will combine high-speed superconductor processors, semiconductor memories with built-in processors, high-speed optical interconnects, and high-density holographic storage. While there are major challenges in all aspects of this project, those in processor architecture are the focus of this paper. Fundamental differences between RSFQ circuits and conventional semiconductor circuits, including a radical jump in clock speed, make today's processor design approaches inappropriate for HTMT. Sequential instruction dispatching, even within the lowest programming unit (a strand), will lead to unacceptably high latencies, hence poor performance. We propose alternative processor designs which use fine-grain synchronizations between individual instructions in order to avoid these bottlenecks.

关键词： Random access memory Optical buffering Holography Holographic optical components Delay computer architecture Optical interconnections electrical capacitance tomography Quantum computing Clocks

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Round-off error free fixed-point design of polynomial FIR predictors

Round-off error free fixed-point design of polynomial FIR pr...

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Asilomar Conference on Signals, Systems & computers

作者： J.M.A. Tanskanen V.S. Dimitrov Institute of Intelligent Power Electronics Department of Electrical and Communications Engineering Helsinki University of Technology Espoo Finland Laboratory of Signal Processing and Computer Technology Department of Electrical and Communications Engineering Helsinki University of Technology Espoo Finland

We present a novel method for designing polynomial FIR predictors for fixed-point environments. Our method yields filters that perform exact prediction of polynomial signals even with short coefficient word lengths. Under ordinary coefficient truncation or rounding, the prediction capability degrades, or may be totally lost. With the proposed method, the filters are designed so that the predictive properties are exactly preserved in fixed-point implementations. The proposed filter design method is based on integer programming (IP) and can be directly applied to any fixed-point FIR design specifications which can be formulated in a form of linear constraints on the filter coefficients.

关键词： Roundoff errors Polynomials Finite impulse response filter Design methodology Design engineering Power engineering and energy Degradation Nonlinear filters Filtering White noise

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Using 3D models for the segmentation of image sequences

Using 3D models for the segmentation of image sequences

引用

IEEE International Conference on Image processing

作者： M.G. Strintsiz I. Kompatsiaris Inf. Process. Lab. Aristotelian Univ. of Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

This paper describes a 3D model-based unsupervised procedure for the segmentation of multiview image sequences using multiple sources of information. The articulation procedure is based on the homogeneity of parameters, such as rigid 3D motion, color and depth, estimated for each sub-object, which consists of a number of interconnected triangles of the 3D model. The rigid 3D motion of each sub-object for subsequent frames is estimated using a Kalman filtering algorithm taking into account the temporal correlation between consecutive frames. Information from all cameras is combined during the formation of the equations for the rigid 3D motion parameters. The parameter estimation for each sub-object and the 3D model segmentation procedures are interleaved and repeated iteratively until a satisfactory object segmentation emerges. The performance of the resulting segmentation method is evaluated experimentally.

关键词： Image segmentation Image sequences Motion estimation Information resources Kalman filters Filtering algorithms Cameras Equations Parameter estimation Object segmentation

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High-performance mixed-machine heterogeneous computing 6

High-performance mixed-machine heterogeneous computing

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6th Euromicro Workshop on parallel and Distributed processing, PDP 1998

作者： Maheswaran, Muthucumaru Braun, Tracy D. Siegel, Howard Jay Parallel Processing Laboratory School of Electrical and Computer Engineering Purdue University West LafayetteIN47907-1285 United States

ISBN: (纸本)0818683325

The focus of this invited keynote paper (to be presented by H. J. Siegel) is mixed-machine heterogeneous computing, where a suite of different kinds of high-performance machines are interconnected by high-speed links. Such a system can be orchestrated to perform an application whose subtasks have diverse execution requirements. Subtasks are assigned to and executed on the machines that will result an a minimal overall execution time for the task, considering factors including anter-machine communication overhead. A conceptual model of the automatic decomposition of tasks and assignment of subtasks is presented. Examples of static and dynamic approaches to the matching and scheduling of subtasks are summarized. Some open research problems are dascussed. © 1998 IEEE

关键词： computers

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Robust image watermarking in the subband or discrete cosine transform domain 9

Robust image watermarking in the subband or discrete cosine ...

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9th European Signal processing Conference, EUSIPCO 1998

作者： Tzovaras, Dimitrios Karagiannis, Nikitas Strintzis, Michael G. Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki54006 Greece

In this paper a method is presented for copyright protection in digital images. Copyright protection is achieved by embedding an invisible signal, known as digital signature or watermark, in the digital image. The method proposed in this paper casts the signature in the frequency domain by slightly modifying the values of randomly selected DC coefficients of the Discrete Cosine Transform (DCT) of the image. The same method is applied also on the Subband or Wavelet Transform coefficients. An adaptive method is proposed also based on perceptual criteria that guarantees the invisibility of the watermark and avoids the deterioration of the image. Signature detection is done via hypothesis testing, without to use any information from the original image. The watermarks embedded by the proposed method are very resistant to JPEG and other frequently used compression. Experimental results using real image data verify the effectiveness of the method.

关键词： Discrete cosine transforms

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Optimization of wireframe model adaptation and motion estimation in a rate-distortion framework 9

Optimization of wireframe model adaptation and motion estima...

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9th European Signal processing Conference, EUSIPCO 1998

作者： Tzovaras, Dimitrios Vachtsvanos, Stavros Strintzis, Michael G. Electrical and Computer Engineering Department Information Processing Laboratory Aristotle University of Thessaloniki Thessaloniki54006 Greece

A rate-distortion framework is used to define a verv low bit rate coding scheme based on wireframe model adaptation and optimized selection of motion estima tors. This technique achieves maximum reconstructed image quality under the constraint ot a target bit rate for the coding of the motion vector field, the wireframe representation information and the prediction error. Ex-perimental results illustrating the performance of the proposed techniques in very low bit rate image sequence coding application areas are presented and evaluated.

关键词： Motion estimation

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Visualisation of videoconference image sequences using VRML 2.0 9

Visualisation of videoconference image sequences using VRML ...

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9th European Signal processing Conference, EUSIPCO 1998

作者： Kompatsiaris, Ioannis Strintzis, Michael G. Electrical and Computer Engineering Department Information Processing Laboratory Aristotle University of Thessaloniki Thessaloniki54006 Greece

In this paper a procedure for visualisation of videocon- ference image sequences using Virtual Reality Modeling Language (VRML) 2.0 is described. First, image sequence analysis is performed in order to estimate the shape and motion parameters of the person talking in front of the camera. For this purpose, we propose the K-Means with connectivity constraint algorithm as a general segmentation algorithm combining information of various types such as colour and motion. The algo-rithm is applied "hierarchically" in the image sequence and it is first used to separate the background from the foreground object and then to further segment the foreground object into the head and shoulders regions. Based on the above information, the 3D shape parameters are estimated for each sequence and a 3D model is automatically adapted. The rigid 3D motion is estimated next for each sub-object. Finally a VRML file is created containing all the above estimated information and can be viewed using any VRML 2.0 compliant browser.

关键词： Visualization

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3d representation of videoconference image sequences using VRML 2.0 3rd

3d representation of videoconference image sequences using V...

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3rd European Conference on Multimedia Applications, Services and Techniques, ECMAST 1998

作者： Kompatsiaris, Ioannis Strintzis, Michael G. Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki54006 Greece

ISBN: (纸本)9783540645948

In this paper a procedure for visualisation of videoconference image sequences using Virtual Reality Modeling Language (VRML) 2.0 is described. First image sequence analysis is performed in order to estimate the shape and motion parameters of the person talking in front of the camera. For this purpose, we propose the K-Means with connectivity constraint algorithm as a general segmentation algorithm combining information of various types such as colour and motion. The algorithm is applied "hierarchically" in the image sequence and it is first used to separate the background from the foreground object and then to further segment the foreground object into the head and shoulders regions. Based on the above information, personal 3D shape parameters are estimated. The rigid 3D motion is estimated next for each sub-object. Finally a VRML file is created containing all the above estimated information. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Image segmentation

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A dynamic matching and scheduling algorithm for heterogeneous computing systems

A dynamic matching and scheduling algorithm for heterogeneou...

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Heterogeneous Computing Workshop

作者： M. Maheswaran H.J. Siegel Parallel Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette USA

A heterogeneous computing system provides a variety of different machines, orchestrated to perform an application whose subtasks have diverse execution requirements. The subtasks must be assigned to machines (matching) and ordered for execution (scheduling) such that the overall application execution time is minimized. A new dynamic mapping (matching and scheduling) heuristic called the hybrid remapper is presented here. The hybrid remapper is based on a centralized policy and improves a statically, obtained initial matching and scheduling by remapping to reduce the overall execution time. The remapping is non-preemptive and the execution of the hybrid remapper can be overlapped with the execution of the subtasks. During application execution, the hybrid remapper uses run-time values for the subtask completion times and machine availability times whenever possible. Therefore, the hybrid remapper bases its decisions on a mixture of run-time and expected values. The potential of the hybrid remapper to improve the performance of initial static mappings is demonstrated using simulation studies.

关键词： Scheduling algorithm Processor scheduling Runtime Dynamic scheduling Availability

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