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

共 465 条记录，以下是41-50 订阅

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Motion compensation for electro-optical line scanner sensors using incomplete data

Motion compensation for electro-optical line scanner sensors...

引用

conference on image reconstruction from incomplete data

作者： Power, GJ USAF Res Lab Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0819437689

When imaging the ground from the air, distortions can occur if the imagery was created from an electro-optical line scanner pointing to nadir and mounted on the bottom of all airborne platform. The inability of the aircraft to maintain a perfect trajectory can cause the distortions. In the worst case scenario, camera stabilizers fail, no geographical reference or navigation data is available, and the sensor periodically fails leaving incomplete data for image reconstruction. Motion compensation can restore the images. This paper describes various distortions that can be created for an airborne nadir-aimed line scanner. A motion-compensation technique is introduced that combines multiple cues from geographical reference and navigation data as well as line-scan matched filtering. A semi-automated restoration implementation is introduced followed by the automated line-scan matched filter implementation. These various compensation techniques provide backup for each other thus creating a more efficient motion-compensation system. Even in the worst case scenario, the system continues to attempt motion compensation using an optimal line-scan matched filtering technique. The results of using this automated technique for motion compensation is demonstrated using simulated high-definition imagery and then using actual electro-optical and hyperspectral images that were obtained from the Dynamic data Base (DDB) program sponsored LS the Defense Advanced Research Projects Agency (DARPA).

关键词： matched filtering Motion compensation image reconstruction hyperspectral electro-optical sensors airborne sensors

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image reconstruction in electron microscopy

Image reconstruction in electron microscopy

引用

conference on image reconstruction from incomplete data V

作者： Zheng, Yili Lee, Seunghee Doerschuk, Peter C. Purdue Univ W Lafayette IN 47907 USA

ISBN: (纸本)9780819472960

Maximum likelihood statistical algorithms are described for estimating the 3-D variation of the electron scattering intensity of biological objects from cryo electron microscopy images of multiple instances of the object. Three virus objects, two spherical and one helical, are considered. Solution of the maximum likelihood problem by expectation maximization algorithms or by direct maximization of the log likelihood requires large scale computing and end-to-end codesign of biological problem formulation, statistical models, algorithms, and software design and implementation have contributed to achieving practical results.

关键词： Cryo electron microscopy cryo EM heterogeneous spherical virus homogeneous spherical virus helical virus maximum likelihood statistical reconstruction 3-D reconstruction tomography nonlinear reconstruction expectation maximization algorithm

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Effects of spectral amplitude and phase errors on image reconstruction

Effects of spectral amplitude and phase errors on image reco...

引用

conference on image reconstruction from incomplete data III

作者： Hsiao, WH Millane, RP Univ Canterbury Dept Elect & Comp Engn Christchurch 1 New Zealand

ISBN: (纸本)0819455008

The relative effects of spectral amplitude and phase errors on reconstructed images are studied in terms of the expected mean-square-error in the image. An appropriate mean-square-error appears to be that between reconstructed and original images that are scaled to have the same energy. Such an error metric appears to reflect the overall perceived quality of the images. Approximate relationships between spectral amplitude and phase errors that give rise to the same image mean-square-error are derived. For large amplitude errors saturation is significant and is studied by simulation. Simulations are used to illustrate these relationships. The relationship to phase dominance is discussed.

关键词： spectrum Fourier transform phase amplitude image reconstruction phase dominance

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MR images from fewer data

MR images from fewer data

引用

conference on image reconstruction from incomplete data viI

作者： Vafadar, Bahareh Bones, Philip J. Univ Canterbury Dept Elect & Comp Engn Computat Imaging Grp Christchurch 1 New Zealand

ISBN: (纸本)9780819492173

There is a strong motivation to reduce the amount of acquired data necessary to reconstruct clinically useful MR images, since less data means faster acquisition sequences, less time for the patient to remain motionless in the scanner and better time resolution for observing temporal changes within the body. We recently introduced an improvement in image quality for reconstructing parallel MR images by incorporating a data ordering step with compressed sensing (CS) in an algorithm named 'PECS'.(1) That method requires a prior estimate of the image to be available. We are extending the algorithm to explore ways of utilizing the data ordering step without requiring a prior estimate. The method presented here first reconstructs an initial image x(1) by compressed sensing (with scarcity enhanced by SVD), then derives a data ordering from x(1), R'(1), which ranks the voxels of x(1) according to their value. A second reconstruction is then performed which incorporates minimization of the first norm of the estimate after ordering by R'(1), resulting in a new reconstruction x(2). Preliminary results are encouraging.

关键词： Parallel Magnetic Resonance Imaging (pMRI) Compressed Sensing (CS)

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image restoration techniques for partially coherent 2-D LADAR imaging systems

Image restoration techniques for partially coherent 2-D LADA...

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conference on image reconstruction from incomplete data III

作者： MacDonald, A Cain, S USAF Inst Technol Dept Elect Engn Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0819455008

A new image reconstruction algorithm is constructed to remove the effect of atmospheric turbulence on motion-compensated frame averaged data collected by a laser illuminated 2-D imaging system. The algorithm simultaneously computes a high resolution image and Fried's seeing parameter via a MAP (Maximum a Priori) estimation technique. This blind deconvolution algorithm differs from other techniques in that it parameterizes the unknown component of the impulse response as an average short-exposure point spread function. The utility of the approach lies in its application to laser illuminated imaging where laser speckle and turbulence effects dominate other sources of error and the field of view of the sensor greatly exceeds the isoplanatic angle.

关键词： Speckle Imaging systems reconstruction algorithms image restoration Sensors Detection and tracking algorithms Coherence (optics) Optical transfer functions Signal detection LIDAR

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Phase retrieval and phase-space tomography from incomplete data sets

Phase retrieval and phase-space tomography from incomplete d...

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conference on image reconstruction from incomplete data III

作者： Testorf, ME Semichaevsky, A Dartmouth Coll Hanover NH 03755 USA

ISBN: (纸本)0819455008

The problem of signal recovery from incomplete data is investigated in the context of phase-space tomography. Particular emphasis is given to the case where only a limited number intensity measurements can be performed, which corresponds to partial coverage of the ambiguity function of the signal. Based on numerical simulations the impact of incomplete knowledge of the ambiguity function on the performance of phase-space tomography is illustrated. Several schemes to address the limited data problem are evaluated. This includes the use of prior information about the phase retrieval problem. In addition, the redundancy of phase-space representations is investigated as the means to recover the signal from partial knowledge of phase space. A generalization of deterministic phase retrieval is introduced which allows one to obtain a model based phase estimate for bandlimited functions. This allows one to use prior information for improving the phase estimate in the presence of noise.

关键词： phase-space tomography phase retrieval deterministic phase retrieval phase-space Wigner distribution function ambiguity function

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Exploiting image sparsity in parallel magnetic resonance imaging (pMRI)

Exploiting image sparsity in parallel magnetic resonance ima...

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conference on image reconstruction from incomplete data V

作者： Wu, Bing Millane, R. P. Watts, Richard Bones, Philip J. Univ Canterbury Dept Elect & Comp Engn Computat Imaging Grp Christchurch 1 New Zealand Univ Canterbury Dept Phys & Astron Christchurch New Zealand

A hybrid method is presented which allows the acceleration of parallel MR imaging through combining the ideas of compressed sensing with inversion of the imaging matrix. A novel data reordering is employed to enhance ... 详细信息

ISBN: (纸本)9780819472960

关键词： Fourier transforms image restoration Magnetic resonance imaging Computer programming Compressed sensing Receivers Signal processing data acquisition Atrial fibrillation Chemical elements

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Imaging fluorescence parameters by Bayesian optical diffusion tomography

Imaging fluorescence parameters by Bayesian optical diffusio...

引用

2nd conference on image reconstruction from incomplete data

作者： Millane, RP Milstein, AM Zhang, Q Oh, S Webb, KJ Bouman, CA Boas, DA Univ Canterbury Dept Elect & Comp Engn Christchurch New Zealand

ISBN: (纸本)0819445592

A Bayesian optimization scheme is presented for reconstructing fluorescent yield and lifetime, the absorption coefficient, and-the scattering coefficient in turbid media, such as biological tissue. The method utilizes measurements at both the excitation and emission wavelengths for reconstructing all unknown parameters. The effectiveness of the reconstruction algorithm is demonstrated by simulation and by application to experimental data from a tissue phantom containing a fluorescent agent.

关键词： optical diffusion tomography fluorescence imaging Bayesian image reconstruction inverse problem nonlinear optimization

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Imaging from scattered fields: limited data and degrees of freedom

Imaging from scattered fields: limited data and degrees of f...

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conference on image reconstruction from incomplete data viI

作者： Ritter, R. Shane Fiddy, Michael A. Perigon Int Inc 931 Ind Dr Matthews NC 28105 USA Univ N Carolina Ctr Optoelect & Opt Commun Charlotte NC 28223 USA

ISBN: (纸本)9780819492173

We describe how the number of degrees of freedom associated with a scattering experiment provides a guide to the minimum number of source and receiver locations required to image the scattering target. Since the number of degrees of freedom is approximately fixed, additional measurements do not necessarily improve the image fidelity in the absence of any prior knowledge. We illustrate these observations using a fast nonlinear inverse scattering method.

关键词： Imaging inverse scattering degrees of freedom

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MAGNITUDE reconstruction OF COMPLEX imageS from incomplete FOURIER PHASE data

MAGNITUDE RECONSTRUCTION OF COMPLEX IMAGES FROM INCOMPLETE F...

引用

16TH ANNUAL CONF OF THE IEEE INDUSTRIAL ELECTRONICS SOC ( IECON 90 )

作者： HE, J PAN, SX Beijing Univ of Aeronaut & Astronaut China

ISBN: (纸本)0879426004

The problem of reconstructing the magnitude of a complex-valued image from incomplete phase data of its Fourier transform is investigated. This is done by formulating the problem as passing the image through a bandpass filter of bandwidth Δ corresponding to the data sample size and evaluating the magnitude of the resulting image. It is revealed that the reconstruction is essentially equivalent to the magnitude of the resulting image obtained by passing the original magnitude function through a set of two-dimensional extended all-pass filters. The concept of an extended all-pass filter is introduced to describe a filter whose amplitude response spreads over the whole frequency space with random variations. It is shown that the quality of the reconstruction is content-dependent and improves with increase of the sample size.

关键词： image Processing

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