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

共 419 条记录，以下是271-280 订阅

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Convex ultrasound image reconstruction with log-Euclidean priors

Convex ultrasound image reconstruction with log-Euclidean pr...

引用

Annual International conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Jose Seabra Joao Xavier Joao Sanches Instituto Superior Técnico Systems and Robotics Institute Lisboa Portugal

image reconstruction from noisy and incomplete observations is usually an ill-posed problem. A Bayesian framework may be adopted do deal with this such inverse task by well posing the reconstruction problem. In this approach, the ill poseness nature of the reconstruction is removed by minimizing a two-term energy function. The first term pushes the solution toward the data and the second regularizes the solution.

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Realtime Visualization of Monocular data for 3D reconstruction

Realtime Visualization of Monocular Data for 3D Reconstructi...

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Canadian conference on Computer and Robot Vision, CRV

作者： Adam Rachmielowski Neil Birkbeck Martin Jägersand Dana Cobzas University of Alberta Canada

Methods for reconstructing photorealistic 3D graphics models from images or video are appealing applications of computer vision. Such methods rely on good input image data, but the lack of user feedback during image acquisition often leads to incomplete or poorly sampled reconstruction results. We describe a video-based system that constructs and visualizes a coarse graphics model in real-time and automatically saves a set of images appropriate for later offline dense reconstruction. Visualization of the model during image acquisition allows the operator to interactively verify that an adequate set of input images has been collected for the modeling task, while automatic image selection keeps storage requirements to a minimum. Our implementation uses real-time monocular SLAM to compute and continuously keep extending a 3D model, augments this with keyframe selection for storage, surface modelling, and on-line rendering of the current structure textured from a selection of key-frames. This rendering gives an immediate and intuitive view of both the geometry and if suitable viewpoints of texture images have already been captured.

关键词： data visualization image reconstruction Computer graphics image storage Rendering (computer graphics) Application software Computer vision Feedback Real time systems Storage automation

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Acquisition of image information from highly incomplete data

Acquisition of image information from highly incomplete data

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IEEE EMBS International conference on Information Technology Applications in Biomedicine (ITAB)

作者： Xiao-Chuan Pan University of Chicago Chicago IL US

Modern tomographic imaging techniques such as computed tomography (CT) and magnetic resonance imaging (MRI) have been used widely for non-invasively acquiring information within the subjects under study. In the last few years, there have been significant advances in tomographic imaging methods. In this presentation, author will discuss some of the recent algorithm developments for obtaining tomographic images of practical utility from data that are considered otherwise highly incomplete from the perspective of the conventional imaging theory. Emphasis will be placed on discussion of some newly developed ideas and algorithms for effective image reconstruction from highly sparse data in CT and MRI. These advances may allow opportunities for devising innovative tomographic imaging applications of highly significant practical merit in biomedical, industrial, security, and other fields. Various examples involving real, challenging CT and MRI imaging data will be used to illustrate and validate these new developments.

关键词： Biomedical imaging Physics Magnetic resonance imaging Computed tomography Radiology Cancer Information technology Biomedical engineering Web and internet services Diabetes

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K-space and image space combination for motion artifact correction in multicoil multishot diffusion weighted imaging

K-space and image space combination for motion artifact corr...

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Annual International conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Anh T. Van Dimitrios C. Karampinos John G. Georgiadis Bradley P. Sutton Electrical and Computer Engineering Department University of Illinois Urbana-Champaign Urbana IL USA Department of Mechanical Science and Engineering and the Beckman Institute University of Illinois Urbana-Champaign IL USA Bioengineering Department the Electrical Engineering Department and the Beckman Institute University of Illinois Urbana IL USA

Motion during diffusion encodings leads to phase errors in different shots of a multishot acquisition. Phase differences in k-space data among shots result in phase cancellation artifacts in the reconstructed image. Due to aliasing of the phase from under-sampled regions of the shot, correction of the phase error using direct low-resolution phase subtraction is incomplete. We introduce a new k-space and image-space combination (KICT) method for motion artifacts cancellation that avoids incomplete phase error correction. Further, the method preserves the phase of the object, which is important for parallel imaging applications.

关键词： image reconstruction Motion artifacts Imaging Trajectory image resolution image coding Encoding

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An evaluation of missing data compensation methods for a PET camera by comparing to no-gap data

An evaluation of missing data compensation methods for a PET...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Hossain Baghaei Hongdi Li Yuxuan Zhang Rocio A. Ramirez Shitao Liu Chao Wang Shaohui An Wai-Hoi Wong University of Texas M.D. Anderson Cancer Center Houston TX USA

We evaluated three methods for filling gaps in PET projection data that may results from gaps between detectors or from defective detectors. These methods include linear interpolation, constraint Fourier space, and forward projection of the images reconstructed from incomplete data iteratively. We compared reconstructed images from the gap-filled data to the images reconstructed from data without gaps acquired by rotating camera gantry during data acquisition. We collected data for a 20-cm flood phantom and the Hoffman brain phantom using the HOTPET camera that has a spatial resolution of about 3 mm. HOTPET Camera has the capability to be rotated during data acquisition and in standard operation it is rotated to fill the gaps in sinograms. images reconstructed from data without gantry rotation and without missing data compensation were dominated by artifacts. Filling the gaps with even the simple and fast linear interpolation resulted in images with significantly less artifacts; however, it was less effective than the other two methods. images from gap-filled data by the other two methods were artifact free but image quality was slightly degraded. Filling the gaps with forward projection of the iterative reconstructed images produced the best results; however, it was the slowest method.

关键词： Positron emission tomography Cameras image reconstruction Filling Detectors Interpolation data acquisition Imaging phantoms Floods Spatial resolution

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Hybrid scene reconstruction by integrating scan data and stereo image pairs

Hybrid scene reconstruction by integrating scan data and ste...

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6th International conference on 3-D Digital Imaging and Modeling

作者： Ma, Xiangyin Zha, Hongbin Peking Univ State Key Lab Machine Percept Beijing 100871 Peoples R China

ISBN: (纸本)9780769529394

3D geometric models obtained by using laser scanners are often incomplete due to the equipment limitations. In this paper we propose a novel hybrid reconstruction algorithm, which integrates stereo image pairs to overcome these limitations. This work focuses on a category of scenes that can be approximated by planes (such as manmade scenes). The scan data are first segmented into planar patches, many of which may be incomplete. Stereo image pairs are then incorporated to retrieve the missing data. Specifically, we decide each plane's extension in the image domain via segment-based stereo matching with disparity layers extracted from scan data. Then, points in the missing area are interpolated by calculating ray-plane intersections. All procedures are automatic except for the range to image registration. The validity of our approach is demonstrated by experiments on real data.

关键词： Stereo image processing

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Post-processing by total variation quasi-solution method for image interpolation

Post-processing by total variation quasi-solution method for...

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17th International conference on Computer Graphics and Vision, GraphiCon 2007

作者： Nasonov, Andrey Krylov, Andrey S. Lukin, Alexey Moscow State University Moscow Russia

image restoration is one of classical inverse problems in image processing and computer vision, which consists of the recovering information about the original image from incomplete or degraded data. In this paper, we consider the problem of reduction of ringing that appears after image resampling. We introduce a novel method for image restoration, based on a quasi-solution method for a compact set of functions with bounded total variation. It is an alternative approach to using a total variation functional as a stabilizer in Tikhonov regularization, and it does not oversmooth or displace edges.

关键词： image reconstruction

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Global optimization for shape fitting

Global optimization for shape fitting

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IEEE conference on Computer Vision and Pattern Recognition

作者： Lempitsky, Victor Boykov, Yuri Moscow MV Lomonosov State Univ Dept Math & Mech Moscow Russia Univ Western Ontario Dept Comp Sci London ON N6A 3K7 Canada

ISBN: (纸本)9781424411795

We propose a global optimization framework for 3D shape reconstruction from sparse noisy 3D measurements frequently encountered in range scanning, sparse feature-based stereo, and shape-from-X. In contrast to earlier local or banded optimization methods for shape fitting, we compute global optimum in the whole volume removing dependence on initial guess and sensitivity to numerous local minima. Our global method is based on two main ideas. First, we suggest a new regularization functional with a data alignment term that maximizes the number of (weakly-oriented) data points contained by a surface while allowing for some measurement errors. Second, we propose a touch-expand algorithm for finding a minimum cut on a huge 3D grid using an automatically adjusted band This overcomes prohibitively high memory cost of graph cuts when computing globally optimal surfaces at high-resolution. Our results for sparse or incomplete 3D data from laser scanning and passive multi-view stereo are robust to noise, outliers, missing parts, and varying sampling density.

关键词： image reconstruction

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Fusion of 3D line features and 2D image line features for building roof reconstruction

Fusion of 3D line features and 2D image line features for bu...

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28th Asian conference on Remote Sensing 2007, ACRS 2007

作者： Jaw, Jen-Jer Cheng, Chieh-Chung Department of Civil Engineering National Taiwan University No. 1 Roosevelt Road Taipei 10617 Taiwan

ISBN: (纸本)9781615673650

The objective of this study is to present an efficient algorithm of building roof reconstruction by fusing 3D line features and 2D image line features through CSR (Construct-Shape-Refine) procedures. The proposed algorithm starts by inputting 3D line features and performs the following geometric inferences: (1) constructing the topological relationship of 3D line features that belong to the same building;(2) shaping the building roof by means of adjustments, compensating missing parts, if any, and reporting whether or not the investigated building roof is completed;(3) refining the building roof by integrating 2D line features observed, automatic image processing or manual measurements, from the images through geometric inference processes. The preliminary experiments show that the proposed CSR algorithm provides a workable platform for building roof reconstruction by fusing 3D line features and 2D image line features. An interactive operating environment is not only advisable when faced with incomplete reconstruction due to the deficiency of automatic systems or data sets but also efficient for improving the quality of building roof model with complete reconstruction, where manual measurements would make up for those insufficiency.

关键词： Roofs

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Signal reconstruction from incomplete and misplaced reasurements

Signal reconstruction from incomplete and misplaced reasurem...

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69th European Association of Geoscientists and Engineers conference and Exhibition 2007 -

作者： Challa, S.S. Hennenfent, G. Herrmann, F.J. University of British Columbia

ISBN: (纸本)9781605601557

Constrained by practical and economical considerations, one often uses seismic data with missing traces. The use of such data results in image artifacts and poor spatial resolution. Sometimes due to practical limitations, measurements may be available on a perturbed grid, instead of on the designated grid. Due to algorithmic requirements, when such measurements are viewed as those on the designated grid, the recovery procedures may result in additional artifacts. This paper interpolates incomplete data onto a regular grid via the Fourier domain, using a recently developed greedy algorithm. The basic objective is to study experimentally as to what could be the size of the perturbation in measurement coordinates that allows for the measurements on the perturbed grid to be considered as on the designated grid. Our experimental work shows that for compressible signals, a uniformly distributed perturbation can be offset with slightly more number of measurements.

关键词： Seismology

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