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Weighted approximate developable minimal B̀�zier surfaces

Journal of Computational Information Systems 2009年第4期5卷 1047-1052页

作者： Xu, Gang Wang, Guozhao Chen, Xiaodiao College of Computer Hangzhou Dianzi University Hangzhou 310018 China Institute of Image Processing and Computer Graphics Department of Mathematics Zhejiang University Hangzhou 310027 China

Developable surfaces and minimal surfaces have been employed in many areas such as sheet-metal and plate-metal based industries, architecture, aviation and ship manufacture. However, nonplanar minimal surfaces cannot be developable surfaces. In this paper, we firstly introduce the new concept of weighted approximate developable minimal surface. It contains approximate developable surface and approximate minimal surface as special cases. For the case of tensor product B´zier surface, given the boundary control points, the interior control points can be constructed using nonlinear optimization algorithm. We mainly adopt the trust-region method in this paper. We also present several examples and the corresponding numeric results on Gaussian curvature and mean curvature. © 2009 Binary Information Press August, 2009.

关键词： Plate metal

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Multichannel image restoration based on optimization of the structural similarity index

Multichannel image restoration based on optimization of the ...

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43rd Asilomar Conference on Signals, Systems and computers

作者： Temerinac-Ott, Maja Burkhardt, Hans Department of Pattern Recognition and Image Processing Institute of Computer Science University of Freiburg Georges-Köhler-Allee Geb. 052 79110 Freiburg Germany University of Freiburg Germany

ISBN: (纸本)9781424458271

In this paper a framework for multichannel image restoration based on optimization of the structural similarity (SSIM) index is presented. The SSIM index describes the similarity of images more appropriately for the human visual system than the mean square error (MSE). It has not yet been explored for the multi channel restoration task. The construction of an optimization algorithm is difficult due to the non-linearity of the SSIM measure. The existing solution based on a quasi-convex problem formulation is successfully extended for the multichannel image restoration. The correctness of the algorithm is verified on sample images and it is shown that multi-view information can significantly improve the restoration results. © 2009 IEEE.

关键词： Convex optimization

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Analysis of appearance features for human matching between different fields of view

Analysis of appearance features for human matching between d...

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2009 IEEE International Conference on Multimedia and Expo, ICME 2009

作者： Xiaowei, Lv Kong, Qing-Jie Fei, Weng Yuncai, Liu Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong Univ. Shanghai China Beckman Institute Department of Electrical and Computer Engineering Univ. of Illinois at Urbana-Champaign Urbana IL United States

ISBN: (纸本)9781424442911

Human matching between different fields of view is a difficult problem in intelligent video surveillance;whereas fusing multiple features has become a strong tool to solve it. In order to guide the fusion scheme, it is necessary to evaluate the matching performance of these features. In this paper, four typical features are chosen for the evaluation. They are the Color Histogram, UV Chromaticity, Major Color Spectrum Histogram, and Scale-Invariant Features (SIFT). Quantities of video data are collected to test their general accuracy, robustness, and real-time applicability. The robustness is measured under the conditions of illumination changes, Gaussian and salt noises, foreground errors, resolution changes, and camera angle differences. The experimental results show that the four features bear distinctive performances under the different conditions, which will provide important references for the feature fusion methods. ©2009 IEEE.

关键词： Graphic methods

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Robust segmentation of freight containers in train monitoring videos

Robust segmentation of freight containers in train monitorin...

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2009 Workshop on Applications of computer Vision, WACV 2009

作者： Kong, Qing-Jie Kumar, Avinash Ahuja, Narendra Liu, Yuncai Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9781424454976

This paper is about a vision-based system that automatically monitors intermodal freight trains for the quality of how the loads (containers) are placed along the train. An accurate and robust algorithm to segment the foreground of containers in videos of the moving train is indispensable for this purpose. Given a video of a moving train consisting of containers of different types, this paper presents a method exploiting the information in both frequency and spatial domains to segment these containers. This method can accurately segment all types of containers under a variety of background conditions, e.g illumination variations and moving clouds, in the train videos shot by a fixed camera. The accuracy and robustness of the proposed method are substantiated through a large number of experiments on real data of train videos. © 2009 IEEE.

关键词： Containers

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Robust image modeling technique with a bioluminesence image segmentation application

Robust image modeling technique with a bioluminesence image ...

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Medical Imaging 2009: Biomedical Applications in Molecular, Structural, and Functional Imaging

作者： Zhong, Jianghong Wang, Ruiping Tian, Jie Department of Biomedical Engineering School of Computer and Information Technology Beijing Jiaotong University Beijing 100044 China Medical Image Processing Group Key Laboratory of Complex Systems and IntelligenceScience Institute of Automation Chinese Academy of Sciences Beijing 100190 China

ISBN: (纸本)9780819475138

A robust pattern classifier algorithm for the variable symmetric plane model, where the driving noise is a mixture of a Gaussian and an outlier process, is developed. The veracity and high-speed performance of the pattern recognition algorithm is proved. Bioluminescence tomography (BLT) has recently gained wide acceptance in the field of in vivo small animal molecular imaging. So that it is very important for BLT to how to acquire the highprecision region of interest in a bioluminescence image (BLI) in order to decrease loss of the customers because of inaccuracy in quantitative analysis. An algorithm in the mode is developed to improve operation speed, which estimates parameters and original image intensity simultaneously from the noise corrupted image derived from the BLT optical hardware system. The focus pixel value is obtained from the symmetric plane according to a more realistic assumption for the noise sequence in the restored image. The size of neighborhood is adaptive and small. What's more, the classifier function is base on the statistic features. If the qualifications for the classifier are satisfied, the focus pixel intensity is setup as the largest value in the ***, it will be ***,pseudo-color is added up to the result of the bioluminescence segmented image. The whole process has been implemented in our 2D BLT optical system platform and the model is proved. © 2009 SPIE.

关键词： Bioluminescence

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A semi-supervised learning approach to online audio background detection

A semi-supervised learning approach to online audio backgrou...

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

作者： Selina Chu Shrikanth Narayanan C.-C. Jay Kuo Department of Computer Science and Signal and Image Processing Institute University of Southern California Los Angeles CA USA

We present a framework for audio background modeling of complex and unstructured audio environments. The determination of background audio is important for understanding and predicting the ambient context surrounding an agent, both human and machine. Our method extends the online adaptive Gaussian Mixture model technique to model variations in the background audio. We propose a method for learning the initial background model using a semi-supervised learning approach. This information is then integrated into the online background determination process, providing us with a more complete background model. We show that we can utilize both labeled and unlabeled data to improve audio classification performance. By incorporating prediction models in the determination process, we can improve the background detection performance even further. Experimental results on real data sets demonstrate the effectiveness of our proposed method.

关键词： Semisupervised learning Predictive models Layout Context awareness Background noise computer science Signal processing image processing Humans Sensor phenomena and characterization

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Sparsity constraints for hyperspectral data analysis: Linear mixture model and beyond

Sparsity constraints for hyperspectral data analysis: Linear...

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Wavelets XIII

作者： Bobin, J. Moudden, Y. Starck, J.-L. Fadili, J. Centre de Saclay Universite Paris Diderot F-91191 Gif- Sur-Yvette France Image Processing Group GREYC CNRS ENSICAEN 14050 Caen Cedex France Department of Applied and Computational Mathematics California Institute of Technology Pasadena CA 91125 United States

ISBN: (纸本)9780819477361

The recent development of multi-channel sensors has motivated interest in devising new methods for the coherent processing of multivariate data. An extensive work has already been dedicated to multivariate data processing ranging from blind source separation (BSS) to multi/hyper-spectral data restoration. Previous work1 has emphasized on the fundamental role played by sparsity and morphological diversity to enhance multichannel signal processing. GMCA is a recent algorithm for multichannel data analysis which was used successfully in a variety of applications including multichannel sparse decomposition, blind source separation (BSS), color image restoration and inpainting. Inspired by GMCA, a recently introduced algorithm coined HypGMCA is described for BSS applications in hyperspectral data processing. It assumes the collected data is a linear instantaneous mixture of components exhibiting sparse spectral signatures as well as sparse spatial morphologies, each in specified dictionaries of spectral and spatial waveforms. We report on numerical experiments with synthetic data and application to real observations which demonstrate the validity of the proposed method. © 2009 SPIE.

关键词： Blind source separation

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Geographical information engineering in the 21st century

Geographical information engineering in the 21st century

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Symposium in Honor of Andrew U. Frank on the Occasion of his 60th Birthday, 2008

作者： Câmara, Gilberto Vinhas, Lúbia Davis, Clodoveu Fonseca, Fred Carneiro, Tiago Image Processing Division São José dos Campos Brazil Computer Science Department Federal University of Minas Gerais Belo Horizonte Brazil College of Information Sciences and Technology Pennsylvania State University State College United States Computer Science Institute Federal University of Ouro Preto Brazil

ISBN: (纸本)9783642375323

This paper discusses the challenges facing GIS designers in the 21st century. We argue that GI engineers lack a sound theoretical basis that would allow them to make best use of new technologies that handle geospatial data. Considering three important topics for the new generations of GIS (change, semantics, and cognition) we show that GIS theory is in a state of flux. Thus, researchers and engineers need to cooperate more for the new generation of GIS to be built in the best possible way. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Geographic information systems

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Geometric parameters based cubic PH curve interpolation and approximation

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Journal of Information and Computational Science 2009年第6期6卷 2423-2432页

作者： Cheng, Min Wang, Guojin Department of Mathematics Zhejiang University Zhejiang Hangzhou 310000 China College of Science Zhejiang University of Technology Zhejiang Hangzhou 310000 China Institute of Computer Graphics and Image Processing Zhejiang University Zhejiang Hangzhou 310000 China

The Pythagorean-hodograph curves offer unique computational advantages in computer aided design and manufacturing. In this paper, geometric parameters based cubic PH curve interpolation and approximation algorithms are presented. The essential geometric parameters include the ratio ρ of the adjacent control polygon legs, the control polygon angle θ, the first control polygon leg L, the included angle δ between the first control polygon edge and the edge joining the origin O and the first control point, as well as the coefficient Dir of curve rotation. Furthermore the problem of PH curve approximation with endpoints interpolation to a cubic non-PH curve is studied, including the algorithms based on different geometric parameters input {δ, θ}, {ρ, θ} and {ρ, δ} respectively. © 2009 Binary Information Press.

关键词： Approximation algorithms

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Nash Bargaining over MIMO Interference Systems

Nash Bargaining over MIMO Interference Systems

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IEEE International Conference on Communications (ICC)

作者： Z. Chen S. A. Vorobyov C.-X. Wang J. Thompson Joint Research Institute for Signal and Image Processing Heriot-Watt University Edinburgh UK Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada Joint Research Institute for Signal and Image Processing University of Edinburgh Edinburgh UK

In this paper, the source covariance matrices of multiple-input multiple-output (MIMO) interference channels (IFCs) are investigated from a game-theoretic perspective. It is proved that the requirement of sufficiently small interference-to- noise ratio (INR) is the sufficient condition for the uniqueness of the Nash bargaining (NB) solution. The structure of the source covariance matrices, which constitute the feasible set of NB solution, is analyzed by comparing them with the covariance matrices leading to the Nash equilibrium (NE). The existence of the NB solution and concavity of the rate product for MIMO IFCs are also studied.

关键词： MIMO Covariance matrix Niobium Radio transmitters Interference channels Nash equilibrium AWGN Signal processing image processing Sufficient conditions

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