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检索条件"机构=Computer Vision & Image Analysis Laboratory Department of Electrical and Computer Engineering"

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The mapping of texture on VR polygonal models

The mapping of texture on VR polygonal models

引用

International Conference on 3D Imaging, Modeling, Processing, Visualization and Transmission (3DIMPVT)

作者： D. Laurendeau N. Bertrand R. Houde Department of Electrical Engineering and Computer Engineering Computer Vision and Systems Laboratory Laval University QUE Canada Robotics Division Hydro-Quebec Research Institute (IREQ) Varennes QUE Canada

The paper addresses the problem of choosing automatically, and without user intervention, the best possible 2D image that should be used to map as a texture on polygons of a geometric model of complex scenes made of several objects. The geometric models and the texture data are obtained separately: the models are built from range data while the texture information is obtained from 2D color images of the scene. The system does not make any assumption on the way the texture data has been acquired. Texture selection results are presented for an indoor scene.

关键词： Virtual reality Layout Solid modeling computer vision Color computer graphics Rendering (computer graphics) Cameras Laboratories Data engineering

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Spectral information divergence for hyperspectral image analysis

Spectral information divergence for hyperspectral image anal...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： 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

The authors propose an information theoretic criterion, called spectral information divergence (SID) for spectral similarity and discriminability. It is derived from the concept of divergence arising in information theory and can be used to describe the statistics of a spectrum. Unlike spectral angle mapper (SAM) which extracts geometric features between two spectra, SID views each pixel spectrum as a random variable and then measures the discrepancy of probabilistic behaviors between two spectra. In order to evaluate SID, SAM is used for comparison via hyperspectral data. Experimental results show that SID can characterise spectral similarity and variability more effectively than SAM.

关键词： Hyperspectral imaging image analysis Hyperspectral sensors Random variables Remote sensing Information theory Pixel Data mining Interference Pattern classification

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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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AM-FM texture segmentation in electron microscopic muscle imaging

AM-FM texture segmentation in electron microscopic muscle im...

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

作者： M. Pattichis C. Pattichis M. Avraam A. Bovik K. Kyriakou Department of Electrical Engineering and Computer Science Washington State University Pullman WA USA Department of Computer Science University of Cyprus Nicosia Cyprus Laboratory for Vision Systems University of Technology Austin TX USA Department of Electron Microscopy The Cyprus Institute of Neurology and Genetics Nicosia Cyprus

We segment the structural units of electron microscope muscle images using a novel AM-FM image representation. This novel AM-FM approach is shown to be effective in describing sarcomeres and mitochondrial regions of t... 详细信息

关键词： image segmentation Electron microscopy Muscles Power harmonic filters Aggregates Deformable models image analysis Algorithm design and analysis computer science Laboratories

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Angle images for measuring heart motion from tagged MRI

Angle images for measuring heart motion from tagged MRI

引用

IEEE International Conference on image Processing

作者： N.F. Osman J.L. Prince Department of Electrical and Computer Engineering Image Analysis and Communications Laboratory Johns Hopkins University USA

This paper introduces a new image processing technique for rapid analysis and visualization of tagged cardiac magnetic resonance (MR) images. The method is based on the use of isolated spectral peaks in SPAMM-tagged magnetic resonance images. The authors call the phase of an image corresponding to just one of these peaks an angle image, and show that except for a phase-wrapping artifact, an angle image is linearly related to a component of the three-dimensional motion. Using one or more angle images, the authors show how to synthesize conventional tag lines, reconstruct displacement fields for small motions, calculate the optical flow between successive temporal images, and calculate two-dimensional strain. The authors demonstrate the performance of this approach on both real and simulated tagged MR images.

关键词： Motion measurement Goniometers Heart Magnetic resonance imaging Magnetic resonance image processing image analysis Magnetic analysis Visualization image reconstruction

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Novel surface registration using the grid closest point (GCP) transform

引用

IEEE International Conference on image Processing

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

ISBN: (纸本)0818688211

A novel approach has been developed for fast registration of two sets of 3-D curves or surfaces. The technique is an extension of Besl and Mackay's (1992) iterative closest point (ICP) algorithm. This technique solves the computational complexity associated with the ICP algorithm by applying a novel grid closest point (GCP) transform and a genetic algorithm to minimize the cost function. A detailed description of the algorithm is presented along with a comparison of its performance versus several registration techniques. Two applications are presented in this paper. In the first, the algorithm is used to register 2-D head contours extracted from CT/MRI data to correct for possible mis-alignment caused by motion artifacts during scanning. In the second, the algorithm is used to register 3-D segments of the human jaw obtained using the shape from shading technique. Registration using the GCP/GA technique is found to be significantly faster and of comparable accuracy than two popular techniques in the computer vision and medical imaging literature.

关键词： Iterative algorithms Iterative closest point algorithm Computational complexity Genetic algorithms Cost function Head Data mining Computed tomography Magnetic resonance imaging Registers

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A system for human jaw modeling using intra-oral images

A system for human jaw modeling using intra-oral images

引用

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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Active contours: an overview with applications to motion artifact cancellation in MRI

Active contours: an overview with applications to motion art...

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

作者： D.L. Guidry A.A. Farag Computer Vision and Image Processing Lab Electrical Engineering Department University of Louisville Louisville KY USA

Motion can be estimated by detecting the edges of a moving object using Active Contours, and registering them together to obtain the motion model parameters. This idea can be applied to patient motion during the acquisition of an MRI to eliminate motion artifacts in the image. The data obtained during the MRI acquistion, the k-space, can be divided into several subbands such that each subband is acquired in a small fraction of the full imaging time. These subbands create invariant tissue feature maps called subband images. Using Active Contours, the relative motion is analyzed across the different subband images to determine the motion parameters. Using these motion parameters it is possible to correct the subbands, thus correcting the k-space. This has the potential to yield clear, noise-free MR images.

关键词： Active contours Magnetic resonance imaging image edge detection computer vision Motion estimation Object detection Motion detection Motion analysis Gray-scale Application software

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Antisymmetric biorthogonal coiflets for image coding

Antisymmetric biorthogonal coiflets for image coding

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IEEE International Conference on image Processing

作者： D. Wei H.-T. Pai A.C. Bovik Laboratory for Image and Video Engineering Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA

Wavelet techniques have achieved a tremendous success in image data compression. In designing wavelet coding algorithms, the choice of wavelet systems is of great importance for compression performance. We design the entire class of antisymmetric biorthogonal coiflet systems, whose filterbanks have even lengths and are linear phase. We show that one of the novel filterbanks achieves noticeably better rate-distortion performance than several state-of-the-art filterbanks in image coding.

关键词： image coding Wavelet analysis Digital signal processing Filter bank Digital images image reconstruction Integrated circuit synthesis Wavelet coefficients Signal processing algorithms Filtering algorithms

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Generically sufficient conditions for exact multichannel blind image restoration

Generically sufficient conditions for exact multichannel bli...

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

作者： Hung-Ta Pai J.W. Havlicek A.C. Bovik Laboratory for Vision Systems Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA

We have previously developed an algorithm and sufficient conditions for exact multichannel blind image restoration. In this paper, we use the resultant matrix theorem and techniques of algebraic geometry to prove that the sufficient conditions hold generically given three blurred versions of the same image and some restrictions on the size of the original image. Moreover, the extension to multichannel blind n-dimensional signal restoration is described.

关键词： Sufficient conditions image restoration Signal restoration Geometry Polynomials Laboratories Machine vision Noise figure

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