99 Hits in 6.8 sec

3D Voronoi Skeletons and Their Usage for the Characterization and Recognition of 3D Organ Shape

M. Näf, G. Székely, R. Kikinis, M.E. Shenton, O. Kübler
1997 Computer Vision and Image Understanding  
algorithm is given for the necessary regulariza-• Analysis and characterization of the morphological tion of the resulting Voronoi diagram.  ...  The proposed algorithm is a 3D generalization of the the surface of individual brains (i.e., the structure of sulci Voronoi skeleton concept, which is already in routine use for 2D and gyri) is fingerprint-like  ...  In other words we are different aspects of organ shape analysis: looking for methods capable of describing global, general shape. • Recognition of organs of the human anatomy in 3D radiological data.  ... 
doi:10.1006/cviu.1997.0610 fatcat:4i7sxdlrg5fa7i42fvkk4yct5u

Shape Analysis of the Human Brain: A Brief Survey

Matthew J. Nitzken, Manuel F. Casanova, Georgy Gimelfarb, Tamer Inanc, Jacek M. Zurada, Ayman El-Baz
2014 IEEE journal of biomedical and health informatics  
The survey outlines and compares popular computational techniques for quantitative description of shapes of major structural parts of the human brain, including medial axis and skeletal analysis, geodesic  ...  Their advantages, drawbacks, and emerging trends, as well as results of application, in particular, for early computer-aided diagnostics, are discussed.  ...  Naf classified various organs, including the brain, after characterizing their structure in 3D images with Voronoi diagrams and skeletons.  ... 
doi:10.1109/jbhi.2014.2298139 pmid:25014938 fatcat:b6so5qoklfdgnh4uw7y5r7dwbe

Multiregion Segmentation Based on Compact Shape Prior

Ran Fan, Xiaogang Jin, Charlie C. L. Wang
2015 IEEE Transactions on Automation Science and Engineering  
As a very important preprocessing step for the industrial design of many applications, the 3D shape of real objects must be scanned and reconstructed in computer systems.  ...  Secondly, we extract components with compact shape by using agglomerative clustering to optimize the normalized cut metric, in which the affinities of boundary compatibility, 2D shape compactness and 3D  ...  Since accuracy and robustness are two important factors for making a segmentation algorithm into practical usage, we have tried to separate high-level recognition of meaningful parts from low-level geometry-based  ... 
doi:10.1109/tase.2014.2317497 fatcat:xtaopz2jrbbxxnj7xa3shujy44

Towards a parameterless 3D mesh segmentation

Sara Farag, Wael Abdelrahman, Saeid Nahavandi, Douglas Creighton, Zeng Zhu
2013 International Conference on Graphic and Image Processing (ICGIP 2012)  
However, if meta data could be embedded in the mesh formulation process, it would make the digitization process much easier.  ...  Figure 6 .1: Example of skeletons for various 3D objects [102] . The 3D skeleton is a 1D representation of 3D mesh.  ...  Most of the devices provide 3D skeletons of the human players so the games can sense their actions in a markerless sense.  ... 
doi:10.1117/12.2010891 fatcat:twkjvy3afrcv3pz2ivr65yhfiy

Geometric Detection Algorithms for Cavities on Protein Surfaces in Molecular Graphics: A Survey

Tiago Simões, Daniel Lopes, Sérgio Dias, Francisco Fernandes, João Pereira, Joaquim Jorge, Chandrajit Bajaj, Abel Gomes
2017 Computer graphics forum (Print)  
Using the three-dimensional structure of a given protein (i.e., atom types and their locations in 3D) as retrieved from a PDB (Protein Data Bank) file, it is now computationally viable to determine a description  ...  In particular, the family of biomolecules spans the building blocks of living organisms.  ...  That is, it does not make usage of α-shapes, Voronoi diagram, β-shaped, or Apollonius diagram.  ... 
doi:10.1111/cgf.13158 pmid:29520122 pmcid:PMC5839519 fatcat:5t4rhndtunhvtmkm32niknst7i

Video Bioinformatics Methods for Analyzing Cell Dynamics: A Survey [chapter]

Nirmalya Ghosh
2015 Computational Biology  
This book chapter reviews state of the art in all these stages and directs further research with references from the above-established fields, including key thrust areas like quantitative cell tracking  ...  , activity analysis, and cellular video summarization-for enhanced data mining and video bioinformatics.  ...  Their work reports recognition accuracy of 95 % for 2D and 98 % for 3D HeLa cell images.  ... 
doi:10.1007/978-3-319-23724-4_2 fatcat:wjsaagwnpbgmziy662tsmw6hv4

A multiresolution descriptor for deformable 3D shape retrieval

Chunyuan Li, A. Ben Hamza
2013 The Visual Computer  
In this paper, we present a spectral graph wavelet framework for the analysis and design of efficient shape signatures for nonrigid 3D shape retrieval.  ...  In a bid to capture the global and local geometry of 3D shapes, we propose a multiresolution signature via a cubic spline wavelet generating kernel.  ...  The idea of HKS was also independently proposed by Gȩbal et al. [15] for 3D shape skeletonization and segmentation under the name of auto diffusion function.  ... 
doi:10.1007/s00371-013-0815-3 fatcat:jgzwh24g5zaq7lmsydbi2wweea

Feature-based similarity search in 3D object databases

Benjamin Bustos, Daniel A. Keim, Dietmar Saupe, Tobias Schreck, Dejan V. Vranić
2005 ACM Computing Surveys  
Over the last few years, a strong interest in methods for 3D similarity search has arisen, and a growing number of competing algorithms for content-based retrieval of 3D objects have been proposed.  ...  We survey feature-based methods for 3D retrieval, and we propose a taxonomy for these methods. We also present experimental results, comparing the effectiveness of some of the surveyed methods.  ...  ACKNOWLEDGMENTS We thank the editors of ACM Computing Surveys and the anonymous referees for their helpful comments on the earlier version of this article.  ... 
doi:10.1145/1118890.1118893 fatcat:qci4gin7j5buzezfetwvbu7oei

Visualization and Analysis of Second-Order Tensors: Moving Beyond the Symmetric Positive-Definite Case

A. Kratz, C. Auer, M. Stommel, I. Hotz
2012 Computer graphics forum (Print)  
The basic idea of this method is to use anisotropic sample distributions for the efficient computation of anisotropic Voronoi cells, which then are used as base elements for texture mapping.  ...  Hence, the usage of textures to encode the tensor's various degrees of freedom becomes possible.  ...  A general and efficient solution of their approach for the 3D case, however, is still missing.  ... 
doi:10.1111/j.1467-8659.2012.03231.x fatcat:bamlrmjhvjfwxcnekmddn7bzm4

Shape Classification using Spectral Graph Wavelets [article]

Majid Masoumi, A. Ben Hamza
2017 arXiv   pre-print
In this pa- per, we propose a spectral graph wavelet approach for 3D shape classification using the bag-of-features paradigm.  ...  In an effort to capture both the local and global geometry of a 3D shape, we present a three-step feature description framework.  ...  The idea of HKS was also independently proposed by Gȩbal et al. [12] for 3D shape skeletonization and segmentation under the name of auto diffusion function.  ... 
arXiv:1705.06250v1 fatcat:hpzp3safqbg4lh3pvrnt4pqjty

X-ray Microcomputed Tomography (µCT) for Mineral Characterization: A Review of Data Analysis Methods

Pratama Istiadi Guntoro, Yousef Ghorbani, Pierre-Henri Koch, Jan Rosenkranz
2019 Minerals  
This study provides a comprehensive overview on the available and potentially useful data analysis methods for processing 3D datasets acquired with laboratory µCT systems.  ...  The main challenge in establishing a µCT system as a mineral characterization tool lies in the computational expenses of processing the large 3D dataset.  ...  Acknowledgments: The authors would like to thank Glacialle Tiu from Division of Geosciences and Environmental Engineering at Luleå University of Technology for providing the µCT dataset.  ... 
doi:10.3390/min9030183 fatcat:ala5cnciszc6df3wwjss75q6mm

Describing shapes by geometrical-topological properties of real functions

S. Biasotti, L. De Floriani, B. Falcidieno, P. Frosini, D. Giorgi, C. Landi, L. Papaleo, M. Spagnuolo
2008 ACM Computing Surveys  
and attributes are crucial for characterizing specific instances of features, while topological properties are necessary to abstract and classify shapes according to invariant aspects of their geometry  ...  In this sense, Morse theory allows one to construct a general framework for shape characterization, parametrized with respect to the mapping function used, and possibly the space associated with the shape  ...  This work has been developed within the CNR research activities ICT-P03 and DG.RSTL.050.004, and with the support of the EU FP6 Network of Excellence AIM@SHAPE, contract number 506766, by the Italian National  ... 
doi:10.1145/1391729.1391731 fatcat:yg6k2lwerfd63nuhhxxypcnzju

New Network Bandwidth-limited Multi-view Video plus Depth Coding Method for 3D Video

Yapei Zhu, Mei Yu, Gunjun Zhang, Zongju Peng, Feng Shao, Gangyi Jiang
2013 Journal of Multimedia  
When 2 J N = , all the elements of 0 J S  must be equal to the sample mean X for all 0 J J ≥ . Since 0 1 0 0 1 J J J  ...  To propose a gesture model updating and results forecasting algorithm based on Mean Shift, and to solve the problem of target model changing and influenced tracking results in gesture target tracking process  ...  Luis Ibanez for the code of literature [19].  ... 
doi:10.4304/jmm.8.1.8-15 fatcat:qm3576jntzfx3ei5m7hfghnskq

Hand Gesture Target Model Updating and Result Forecasting Algorithm based on Mean Shift

Xiao Zou, Heng Wang, Qiuyu Zhang
2013 Journal of Multimedia  
When 2 J N = , all the elements of 0 J S  must be equal to the sample mean X for all 0 J J ≥ . Since 0 1 0 0 1 J J J  ...  To propose a gesture model updating and results forecasting algorithm based on Mean Shift, and to solve the problem of target model changing and influenced tracking results in gesture target tracking process  ...  Luis Ibanez for the code of literature [19].  ... 
doi:10.4304/jmm.8.1.1-7 fatcat:xqdevbogajdvnn3ym3gtog5nca

Quantitative analysis of flow dynamics of organic granular materials inside a versatile silo model during time-lapse X-ray tomography experiments

Laurent Babout, Krzysztof Grudzień, Selam Waktola, Konrad Miśkiewicz, Jerome Adrien, Eric Maire
2020 Computers and Electronics in Agriculture  
Here, the paper introduces a new versatile silo model that was specially designed for in situ X-ray tomography studies of silo discharge for various flow conditions, namely concentric and eccentric.  ...  The paper focuses on the analysis of packing density, coordination number and grain rotation changes during funnel flow.  ...  Acknowledgments: This research was funded by the National Science Centre in Poland (grant number: 2015/19/B/ST8/02773).  ... 
doi:10.1016/j.compag.2020.105346 fatcat:hlow7eljx5etpar6j7wf23cqru
« Previous Showing results 1 — 15 out of 99 results