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检索条件"任意字段=Conference on Image Reconstruction from Incomplete Data IV"

共 516 条记录，以下是341-350 订阅

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Proceedings of SPIE -image reconstruction from incomplete data iv

Proceedings of SPIE -Image Reconstruction from Incomplete Da...

引用

image reconstruction from incomplete data iv

ISBN: (纸本)0819463957

The proceedings contain 20 papers. The topics discussed include: turbulence profiling using extended objects for slope detection and ranging (SLODAR);mitigating atmospheric effects in high-resolution infrared surveillance imagery with bispectral speckle imaging;restoration of nonuniformly wrapped images using accurate frame by frame shiftmap accumulation;three-dimensional image reconstruction in variable density acoustic tomography;imaging with singular electromagnetic beam;comparative study of projection/back-projection schemes in cryo-EM tomography;intensity diffraction tomography with a novel scanning protocol;quantifying and correcting motion artifacts in MRI;the optimal reconstruction from blurred and nonuniformly sampled data based on the optimum discrete approximation minimizing various worst-case measures of error;and analysis of gravel river beds using three-dimensional laser scanning.

关键词： image reconstruction

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Improved image reconstruction from multiple frames

Improved image reconstruction from multiple frames

引用

conference on image reconstruction from incomplete data iv

作者： Testorf, Markus E. Fiddy, Michael Dartmouth Coll Thayer Sch Engn 8000 Cummings Hall Hanover NH 03755 USA Univ N Carolina Ctr Optoelect & Opt Commun Charlotte NC USA

ISBN: (纸本)0819463957

A method is described for reconstructing images from incomplete data sets if subsets of the data are obtained with different data acquisition systems. The proposed method is able to incorporate prior information about the object into the reconstruction process. The general scheme is applied to construct improved images from multiple low resolution frames of the same scene, where each frame is obtained with an imaging system characterized by a different response function. The working principle is demonstrated with synthetic data for a set of generic imaging systems. Additional attention is given to the potential of the inherent superresolution capabilities of this method in the context of compressed image representations.

关键词： computational imaging resolution enhancement image reconstruction multiple image frames

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Three-dimensional image reconstruction in variable density acoustic tomography

Three-dimensional image reconstruction in variable density a...

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conference on image reconstruction from incomplete data iv

作者： Anastasio, Mark A. Shi, Daxin IIT Dept Biomed Engn Chicago IL 60616 USA

ISBN: (纸本)0819463957

Diffraction tomography (DT) is an established imaging technique for use with diffracting wavefields, which represents a generalized form of x-ray tomography. In this work, we revisit the three-dimensional reconstruction problem of DT for variable density acoustic media. Novel reconstruction algorithms are developed for reconstructing separate images that depict a weakly scattering object's compressibility and density variations. If tomographic measurement data are acquired at four distinct temporal frequencies, we demonstrate that the effects of object dispersion can be accounted for completely by use of analytic reconstruction formulas. Computer-simulation studies are conducted to demonstrate the developed image reconstruction methods.

关键词： ultrasound tomography acoustic dispersion diffraction tomography image reconstruction

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Analysis and modelling of substitution disorder in the myosin lattice of vertebrate muscle

Analysis and modelling of substitution disorder in the myosi...

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conference on image reconstruction from incomplete data iv

作者： Millane, R. P. Yoon, C. H. Blakeley, N. D. Goyal, A. Univ Canterbury Dept Elect & Comp Engn Computat Imaging Grp Private Bag 4800 Christchurch 1 New Zealand

ISBN: (纸本)0819463957

Myosin filaments are important components of striated muscle and pack in a semi-ordered, two-dimensional array. The array can be imaged by electron microscopy of thin cross-sections which indicates, for many species, that the filaments adopt two orientations that are distributed with short-ranging order. We describe analysis and modelling of this substitution disorder based on the micrographs and an Ising model.

关键词： image analysis electron micrograph lattice disorder myosin muscle Ising model

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Restoration of nonuniformly warped images using accurate frame by frame shiftmap accumulation

Restoration of nonuniformly warped images using accurate fra...

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conference on image reconstruction from incomplete data iv

作者： Tahtali, Murat Lambert, Andrew J. Fraser, Don UNSW Sch Aerosp Civil & Mech Eng ADFA Canberra ACT Australia UNSW Sch Informat Technol & Elect Engn ADFA Canberra ACT Australia

ISBN: (纸本)0819463957

When imaging through the atmosphere, the resulting image contains not only the desired scene, but also the adverse effects of all the turbulent air mass between the camera and the scene. These effects are viewed as a combination of non-uniform blurring and random shifting of each point in the received short-exposure image. Corrections for both aspects of this combined distortion have been tackled reasonably successfully by previous efforts. A potentially more robust method of restoring the geometry is presented, which is also better suited to real-time implementation. The improvements were achieved by replacing the concept of prototype frame with the sequential registration of each frame with its nearest neighbour and the accurate accumulation of shiftmaps from any one frame to another without redundant calculations.

关键词： adaptive optics image registration image restoration

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The optimal reconstruction from blurred and nonuniformly sampled data based on the optimum discrete approximation minimizing various worst-case measures of error

The optimal reconstruction from blurred and nonuniformly sam...

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conference on image reconstruction from incomplete data iv

作者： Kida, Yuichi Kida, Takuro Ohu Univ Dept Pharm Koriyama Fukushima 9638611 Japan Nihon Univ Dept Elect & Elect Engn Koriyama Fukushima 9638642 Japan

ISBN: (纸本)0819463957

Extended interpolatory approximation is discussed for some classes of n-dimensional vector signals. Firstly, we present two sufficient conditions of the optimum approximation and prove that the proposed optimum approximation using fixed finite number of sample values satisfies these two conditions. Secondly, we discuss the optimum running approximation of n-dimensional time-limited vector signals based on a certain one-to-one correspondence between a vector signal and the corresponding vector error signal of approximation. The proposed optimum approximation has the minimum measure of error among almost all the linear and the nonlinear approximations using the same measure of error and generalized sample values. Note that the proposed optimum approximation can be realized by flexible FIR filter bank. The term "flexible" means that we can widely choose the number of paths and frequency response of time-invariant FIR analysis filters. Moreover, we can use sample points that are distributed on an arbitrary periodical pattern.

关键词： digital signal processing interpolation approximation the optimum approximation filter bank

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Statistically optimal image reconstruction for multi-detector intensity diffraction tomography

Statistically optimal image reconstruction for multi-detecto...

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image reconstruction from incomplete data iv

作者： Huang, Yin Anastasio, Mark A. Department of Biomedical Engineering Illinois Institute of Technology Chicago IL 60616

ISBN: (纸本)0819463957

Intensity diffraction tomography (I-DT) is an in-line holographic imaging method for reconstructing the three-dimensional complex refractive index distribution of a weakly scattering object. Because it circumvents the phase retrieval problem of diffraction tomography, I-DT reconstruction methods may benefit a range of imaging problems involving optical and coherent X-ray radiation. In this work, we investigate the use of statistically complementary data, provided by multiple (> 2) in-line intensity measurements, for effective suppression of image noise in I-DT. The noise properties of the reconstructed images are demonstrated to depend strongly on the specification of measurement geometry. The effects of experimental uncertainties on the performance of I-DT is investigated also. Computer-simulation studies that are representative of a tomographic microscopy implementation of I-DT are presented.

关键词： image reconstruction

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Compressed sensing image reconstruction via recursive spatially adaptive filtering

Compressed sensing image reconstruction via recursive spatia...

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14th IEEE International conference on image Processing, ICIP 2007

作者： Egiazarian, Karen Foi, Alessandro Katkovnik, Vladimir Institute of Signal Processing Tampere University of Technology P.O. Box 553 33101 Tampere Finland

ISBN: (纸本)1424414377

We introduce a new approach to image reconstruction from highly incomplete data. The available data are assumed to be a small collection of spectral coefficients of an arbitrary linear transform. This reconstruction problem is the subject of intensive study in the recent field of "compressed sensing" (also known as "compressive sampling"). Our approach is based on a quite specific recursive filtering procedure. At every iteration the algorithm is excited by injection of random noise in the unobserved portion of the spectrum and a spatially adaptive image denoising filter, working in the image domain, is exploited to attenuate the noise and reveal new features and details out of the incomplete and degraded observations. This recursive algorithm can be interpreted as a special type of the Robbins-Monro stochastic approximation procedure with regularization enabled by a spatially adaptive filter. Overall, we replace the conventional parametric modeling used in CS by a nonparametric one. We illustrate the effectiveness of the proposed approach for two important inverse problems from computerized tomography: Radon inversion from sparse projections and limited-angle tomography. In particular we show that the algorithm allows to achieve exact reconstruction of synthetic phantom data even from a very small number projections. The accuracy of oui- reconstruction is in line with die best results in the compressed sensing field. © 2007 IEEE.

关键词： Compressed sensing

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reconstruction of digital holograms on tilted planes

Reconstruction of digital holograms on tilted planes

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conference on Optical Information Systems iv

作者： De Nicola, S. Finizio, A. Pierattini, G. Alfieri, D. Ferraro, P. CNR Ist Cibernet E Caianiello Via Campi Flegrei 34 I-80078 Pozzuoli Na Italy CNR Ist Nazl Ott Applicata I-80078 Pozzuoli Na Italy

ISBN: (纸本)0819463906

We present a new method for numerically reconstructing digital holograms on tilted planes. The method is based on the angular spectrum of plane waves. Fast Fourier transform algorithm is used twice and coordinate rotation in the Fourier domain enables to reconstruct the object field on the tilted planes. Correction of the anamorphism resulting from the coordinate transformation is performed by suitable interpolation of the spectral data. Experimental results are presented to demonstrate the method for a single-axis rotation. The algorithm is especially useful for tomographic image reconstruction.

关键词： Digital holography Holograms 3D image reconstruction reconstruction algorithms Holography Spatial frequencies Digital recording Fourier transforms image restoration Tomography

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Wavelet-based feature extraction method for inspection using cross-sensor image data

Wavelet-based feature extraction method for inspection using...

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conference on Wavelet Applications in Industrial Processing iv

作者： Ouendeno, M. Kozaitis, S. P. Florida Inst Technol Dept Elect & Comp Engn 150 W Univ Blvd Melbourne FL 32901 USA

ISBN: (纸本)9780819464811

We used a method designed to fuse imagery from different sensor types. The method uses different forward transforms of input images and a common transform to reconstruct the final result. When measuring the average relative entropy of the fused results, we found that our method gave generally better results when compared to a more conventional approach. We found that reconstruction filters with a small number of zeros seemed to give the best performance.

关键词： image fusion image transform wavelet wavelet transform

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