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1
October 2015
3DV '15: Proceedings of the 2015 International Conference on 3D Vision
Publisher: IEEE Computer Society
In this work we study the interpolation problem in contouring methods such as Marching Cubes. Traditionally, linear interpolation is used to define the position of an is vertex along a zero-crossing edge, which is a suitable approach if the underlying implicit function is (approximately) piecewise linear along each edge. Non-linear ...
Keywords:
Marching Cubes, Hermite interpolation, Isosurface Extraction
2
August 2015
Computer Graphics Forum: Volume 34 Issue 5, August 2015
Publisher: The Eurographs Association & John Wiley & Sons, Ltd.
In computer graphics, numerous geometry processing applications reduce to the solution of a Poisson equation. When considering geometries with symmetry, a natural question to consider is whether and how the symmetry can be leveraged to derive an efficient solver for the underlying system of linear equations. In this work we ...
Keywords:
Categories and Subject Descriptors according to ACM CCS, I.3.5 [Computer Graphics]: Geometric algorithms, languages, and systems-Fluid Simulation
3
August 2015
Computer Graphics Forum: Volume 34 Issue 5, August 2015
Publisher: The Eurographs Association & John Wiley & Sons, Ltd.
This work revisits the Shock Filters of Osher and Rudin [OR90] and shows how the proposed filtering process can be interpreted as the advection of image values along flow-lines. Using this interpretation, we obtain an efficient implementation that only requires tracing flow-lines and re-sampling the image. We show that the ...
Keywords:
I.4.3 [Image Processing and Computer Vision]: Enhancement-Sharpening and deblurring, Categories and Subject Descriptors according to ACM CCS, I.3.5 [Computer Graphics]: Computational Geometry and Object Modeling-Hierarchy and geometric transformations
4
July 2015
ACM Transactions on Graphics (TOG) - Proceedings of ACM SIGGRAPH 2015: Volume 34 Issue 4, August 2015
Publisher: ACM
Bibliometrics:
Citation Count: 4
Downloads (6 Weeks): 10, Downloads (12 Months): 73, Downloads (Overall): 269
Full text available:
 PDF
We propose a new spectral analysis of the variance in Monte Carlo integration, expressed in terms of the power spectra of the sampling pattern and the integrand involved. We build our framework in the Euclidean space using Fourier tools and on the sphere using spherical harmonics. We further provide a ...
Keywords:
Monte Carlo integration, fourier analysis, global illumination, spherical harmonics, stochastic sampling
5
July 2015
SGP '15: Proceedings of the Eurographics Symposium on Geometry Processing
Publisher: Eurographics Association
This work revisits the Shock Filters of Osher and Rudin [OR90] and shows how the proposed filtering process can be interpreted as the advection of image values along flow-lines. Using this interpretation, we obtain an efficient implementation that only requires tracing flow-lines and re-sampling the image. We show that the ...
6
July 2015
SGP '15: Proceedings of the Eurographics Symposium on Geometry Processing
Publisher: Eurographics Association
In computer graphics, numerous geometry processing applications reduce to the solution of a Poisson equation. When considering geometries with symmetry, a natural question to consider is whether and how the symmetry can be leveraged to derive an efficient solver for the underlying system of linear equations. In this work we ...
7
Randal Burns,
Kunal Lillaney,
Daniel R. Berger,
Logan Grosenick,
Karl Deisseroth,
R. Clay Reid,
William Gray Roncal,
Priya Manavalan,
Davi D. Bock,
Narayanan Kasthuri,
Michael Kazhdan,
Stephen J. Smith,
Dean Kleissas,
Eric Perlman,
Kwanghun Chung,
Nicholas C. Weiler,
Jeff Lichtman,
Alexander S. Szalay,
Joshua T. Vogelstein,
R. Jacob Vogelstein
July 2013
SSDBM: Proceedings of the 25th International Conference on Scientific and Statistical Database Management
Publisher: ACM
Bibliometrics:
Citation Count: 1
Downloads (6 Weeks): 4, Downloads (12 Months): 41, Downloads (Overall): 250
Full text available:
PDF
We describe a scalable database cluster for the spatial analysis and annotation of high-throughput brain imaging data, initially for 3-d electron microscopy image stacks, but for time-series and multi-channel data as well. The system was designed primarily for workloads that build connectomes ---neural connectivity maps of the brain---using the parallel ...
Keywords:
connectomics, data-intensive computing
8
July 2013
ACM Transactions on Graphics (TOG): Volume 32 Issue 3, June 2013
Publisher: ACM
Bibliometrics:
Citation Count: 57
Downloads (6 Weeks): 72, Downloads (12 Months): 463, Downloads (Overall): 1,329
Full text available:
PDF
Poisson surface reconstruction creates watertight surfaces from oriented point sets. In this work we extend the technique to explicitly incorporate the points as interpolation constraints. The extension can be interpreted as a generalization of the underlying mathematical framework to a screened Poisson equation. In contrast to other image and geometry ...
Keywords:
adaptive octree, Screened Poisson equation, surface fitting, finite elements
9
May 2013
IEEE Transactions on Visualization and Computer Graphics: Volume 19 Issue 5, May 2013
Publisher: IEEE Educational Activities Department
A new type of deformable model is presented that merges meshes and level sets into one representation to provide interoperability between methods designed for either. This includes the ability to circumvent the CFL time step restriction for methods that require large step sizes. The key idea is to couple a ...
Keywords:
Level set,Deformable models,Springs,Image segmentation,Imaging,Materials,Computational modeling,shape model,Segmentation,registration,tracking,atlas
10
October 2012
MICCAI'12: Proceedings of the 15th international conference on Medical Image Computing and Computer-Assisted Intervention - Volume Part II
Publisher: Springer-Verlag
An emerging topic is to build image segmentation systems that can segment hundreds to thousands of objects (i.e. cell segmentation \ tracking, full brain parcellation, full body segmentation, etc.). Multi-object Level Set Methods (MLSM) perform this task with the benefit of sub-pixel precision. However, current implementations of MLSM are not ...
Keywords:
active contours, parallel, level set, segmentation
11
October 2012
MICCAI'12: Proceedings of the 15th international conference on Medical Image Computing and Computer-Assisted Intervention - Volume Part I
Publisher: Springer-Verlag
A new data structure is presented for geometrically modeling multi-objects. The model can exhibit elastic and fluid-like behavior to enable interpretability between tasks that require both deformable registration and active contour segmentation. The data structure consists of a label mask, distance field, and springls (a constellation of disconnected triangles). The ...
Keywords:
level set, registration, segmentation, active contour, mesh, tracking
12
August 2012
Computer Graphics Forum: Volume 31 Issue 5, August 2012
Publisher: John Wiley & Sons, Inc.
This work considers the question of whether mean-curvature flow can be modified to avoid the formation of singularities. We analyze the finite-elements discretization and demonstrate why the original flow can result in numerical instability due to division by zero. We propose a variation on the flow that removes the numerical ...
Keywords:
I.3.5 [Computer Graphics]: Geometric algorithms, languages, and systems—Surface Flow
13
July 2012
Graphical Models: Volume 74 Issue 4, July, 2012
Publisher: Academic Press Professional, Inc.
14
October 2011
IEEE Transactions on Visualization and Computer Graphics: Volume 17 Issue 10, October 2011
Publisher: IEEE Educational Activities Department
We present a new technique for fusing together an arbitrary number of aligned images into a single color or intensity image. We approach this fusion problem from the context of Multidimensional Scaling (MDS) and describe an algorithm that preserves the relative distances between pairs of pixel values in the input ...
Keywords:
Multidimensional images, visualization techniques, dimensionality reduction, multidimensional scaling, physical sciences and engineering, life and medical sciences.
15
September 2011
MICCAI'11: Proceedings of the 14th international conference on Medical image computing and computer-assisted intervention - Volume Part II
Publisher: Springer-Verlag
A new type of deformable model is presented that merges meshes and level sets into one representation to provide interoperability between methods designed for either. The key idea is to use a constellation of triangular surface elements (springls) to define a level set. A Spring Level Set (SpringLS) can be ...
Keywords:
deformable model, level set, segmentation, active contour, mesh
16
July 2011
SIGGRAPH '11: ACM SIGGRAPH 2011 papers
Publisher: ACM
Bibliometrics:
Citation Count: 4
Downloads (6 Weeks): 7, Downloads (12 Months): 38, Downloads (Overall): 964
Full text available:
PDF
We present a general framework for performing geometry filtering through the solution of a screened Poisson equation. We show that this framework can be efficiently adapted to a changing Riemannian metric to support curvature-aware filtering and describe a parallel and streaming multigrid implementation for solving the system. We demonstrate the ...
Keywords:
multigrid, Laplace-Beltrami, real-time, surface editing
Also published in:
July 2011
ACM Transactions on Graphics (TOG) - Proceedings of ACM SIGGRAPH 2011: Volume 30 Issue 4, July 2011
17
February 2011
ACM SIGMOD Record: Volume 39 Issue 3, September 2010
Publisher: ACM
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 1, Downloads (12 Months): 10, Downloads (Overall): 275
Full text available:
PDF
18
December 2010
ACM Transactions on Graphics (TOG) - Proceedings of ACM SIGGRAPH Asia 2010: Volume 29 Issue 6, December 2010
Publisher: ACM
Bibliometrics:
Citation Count: 3
Downloads (6 Weeks): 6, Downloads (12 Months): 55, Downloads (Overall): 472
Full text available:
PDF
Processing spherical images is challenging. Because no spherical parameterization is globally uniform, an accurate solver must account for the spatially varying metric. We present the first efficient metric-aware solver for Laplacian processing of spherical data. Our approach builds on the commonly used equirectangular parameterization, which provides differentiability, axial symmetry, and ...
Keywords:
Laplace-Beltrami, panoramas, equirectangular
Also published in:
December 2010
SIGGRAPH ASIA '10: ACM SIGGRAPH Asia 2010 papers
19
September 2010
MICCAI'10: Proceedings of the 13th international conference on Medical image computing and computer-assisted intervention: Part III
Publisher: Springer-Verlag
The task of IMRT planning, particularly in head-and-neck cancer, is a difficult one, often requiring days of work from a trained dosimetrist. One of the main challenges is the prescription of achievable target doses that will be used to optimize a treatment plan. This work explores a data-driven approach in ...
Keywords:
data-driven IMRT planning, overlap volume histogram, achievable dose querying
20
June 2010
SSDBM'10: Proceedings of the 22nd international conference on Scientific and statistical database management
Publisher: Springer-Verlag
We present a technique for organizing data in spatial databases with non-convex domains based on an automatic characterization using the medial-axis transform (MAT). We define a tree based on the MAT and enumerate its branches to partition space and define a linear order on the partitions. This ordering clusters data ...
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