Filters








43,228 Hits in 5.7 sec

Approximate image-based tree-modeling using particle flows

Boris Neubert, Thomas Franken, Oliver Deussen
2007 ACM Transactions on Graphics  
Abstract We present a method for producing 3D tree models from input photographs with only limited user intervention. An approximate voxel-based tree volume is estimated using image information.  ...  The models approximate the input images while forming botanically plausible branching structures.  ...  Previous Work Classical tree modeling is rule-based or uses modeling procedures.  ... 
doi:10.1145/1276377.1276487 fatcat:zsjnkhlrtndghixjdtpmzhdo24

Approximate image-based tree-modeling using particle flows

Boris Neubert, Thomas Franken, Oliver Deussen
2007 ACM SIGGRAPH 2007 papers on - SIGGRAPH '07  
Abstract We present a method for producing 3D tree models from input photographs with only limited user intervention. An approximate voxel-based tree volume is estimated using image information.  ...  The models approximate the input images while forming botanically plausible branching structures.  ...  Previous Work Classical tree modeling is rule-based or uses modeling procedures.  ... 
doi:10.1145/1275808.1276487 fatcat:tfhverj26zaaxf7vtgnjf6luee

Approximate image-based tree-modeling using particle flows

Boris Neubert, Thomas Franken, Oliver Deussen
2007 ACM Transactions on Graphics  
Abstract We present a method for producing 3D tree models from input photographs with only limited user intervention. An approximate voxel-based tree volume is estimated using image information.  ...  The models approximate the input images while forming botanically plausible branching structures.  ...  Previous Work Classical tree modeling is rule-based or uses modeling procedures.  ... 
doi:10.1145/1239451.1239539 fatcat:teny65vtkfgt5fr5utfdrdladm

Comparing microsphere deposition and flow modeling in 3D vascular trees

M. Marxen, J. G. Sled, L. X. Yu, C. Paget, R. M. Henkelman
2006 American Journal of Physiology. Heart and Circulatory Physiology  
Microsphere deposition is used as an estimate of local perfusion. A 3D cylindrical pipe model of the arterial tree is generated based on an image of the arterial cast.  ...  Results of a flow model are compared with local microsphere deposition. High correlation (r 2 Ͼ 0.94) was observed between measured and modeled flows through the vascular tree segments.  ...  Comparison of relative flow predictions based on the model with the microsphere data for vessel segments with one or more associated particles.  ... 
doi:10.1152/ajpheart.00146.2006 pmid:16766647 fatcat:betaqnunong7dequcgi7ep3wpm

Reconstructing 3D Tree Models Using Motion Capture and Particle Flow

Jie Long, Michael D. Jones
2013 International Journal of Computer Games Technology  
We present a method for tree shape reconstruction using particle flow on input data obtained from a passive optical motion capture system.  ...  Existing algorithms for generating models of tree branching structures for image synthesis in computer graphics are not adapted to the unique data set provided by motion capture.  ...  Image-or video-based approaches convert a set of 2D input images into 3D tree models by filling in the missing dimension.  ... 
doi:10.1155/2013/363160 fatcat:y3uxe6f23zh6tmtmg3i3apznoa

Vascular flow rendering for interactive simulation of contrast and drugs injection

Binh P. Nguyen, C. K. Chui, S. H. Ong, Stephen Chang
2009 TENCON 2009 - 2009 IEEE Region 10 Conference  
Quadrilaterals which are aligned along the viewing direction are rendered to visualize the movement of particles through the flow modeled using Hagen-Poiseuille Flow.  ...  Our visualization method achieves a computational efficient and good visual approximation of the flow of particles inside the vessels under fluoroscopic imaging.  ...  The physics-based flow model is unique and is important for an accurate simulation of drug flow.  ... 
doi:10.1109/tencon.2009.5395825 fatcat:nerhlcaf3ffhhfem3ruphnumxa

Multiscale image-based modeling and simulation of gas flow and particle transport in the human lungs

Ching-Long Lin, Merryn H. Tawhai, Eric A. Hoffman
2013 Wiley Interdisciplinary Reviews: Systems Biology and Medicine  
With this objective in mind, recent advances in computational fluid dynamics (CFD) of the bronchial airways -from a single bifurcation symmetric model to a multiscale image-based subject-specific lung  ...  to integrate quantifiable regional features from imaging with associated value-added high-level modeling.  ...  AIRWAY STRUCTURE Symmetric, asymmetric, and CT-based airway models Symmetric tubular airway models based on Weibel's symmetric model 1 have been widely used to investigate pulmonary gas flow and particle  ... 
doi:10.1002/wsbm.1234 pmid:23843310 pmcid:PMC3763693 fatcat:jyor4jbgond77fwate22c4nnqu

Probabilistic Plant Modeling via Multi-View Image-to-Image Translation [article]

Takahiro Isokane, Fumio Okura, Ayaka Ide, Yasuyuki Matsushita, Yasushi Yagi
2018 arXiv   pre-print
By inferring the probability of branch existence using a Bayesian extension of image-to-image translation applied to each of multi-view images, our method generates a probabilistic plant 3D model, which  ...  Unlike previous geometric approaches that heavily rely on the visibility of the branches or use parametric branching models, our method makes statistical inferences of branch structures in a probabilistic  ...  Inspired by a conventional tree modeling approach [20] , we develop a branch structure generation method using particle flows.  ... 
arXiv:1804.09404v1 fatcat:c7abl347xjebtb6sbybcrzpm6a

Image-based modeling of lung structure and function

Merryn H. Tawhai, Ching-Long Lin
2010 Journal of Magnetic Resonance Imaging  
Current state-of-the-art in image-based modeling allows derivation of patient-specific models of the lung, lobes, airways, and pulmonary vascular trees.  ...  Here we review some efforts to resolve each of these issues, with particular focus on image-based models that have been developed to simulate air flow from the mouth to the terminal bronchiole, and subjected  ...  Acknowledgments We acknowledge the contribution of a team of students and postdoctoral staff to the development of this modeling effort: Jiwoong Choi, Haribalan Kumar, Nicholas Warren, Guohua Xia, and  ... 
doi:10.1002/jmri.22382 pmid:21105146 pmcid:PMC3058528 fatcat:uqs6m5ag7bgh7gi5gqhezqtoum

Regional Deposition of Particles in an Image-Based Airway Model: Large-Eddy Simulation and Left-Right Lung Ventilation Asymmetry

Andrew R. Lambert, Patrick T. O'shaughnessy, Merryn H. Tawhai, Eric A. Hoffman, Ching-Long Lin
2011 Aerosol Science and Technology  
The airway model consists of a seven-generation human airway tree, with oral cavity, pharynx and larynx. The turbulent flow in the upper respiratory tract is simulated by large-eddy simulation.  ...  Regional deposition and ventilation of particles by generation, lobe and lung during steady inhalation in a computed tomography (CT) based human airway model are investigated numerically.  ...  Ma and Lutchen (2008) performed a CFD study on an airway model derived from a CT-based one-dimensional centerline airway tree using the k-ε turbulence model.  ... 
doi:10.1080/02786826.2010.517578 pmid:21307962 pmcid:PMC3034252 fatcat:rzz2ab473vhu3m4dbfsz46gpnq

Probabilistic Plant Modeling via Multi-view Image-to-Image Translation

Takahiro Isokane, Fumio Okura, Ayaka Ide, Yasuyuki Matsushita, Yasushi Yagi
2018 2018 IEEE/CVF Conference on Computer Vision and Pattern Recognition  
By inferring the probability of branch existence using a Bayesian extension of image-toimage translation applied to each of multi-view images, our method generates a probabilistic plant 3D model, which  ...  Unlike previous geometric approaches that heavily rely on the visibility of the branches or use parametric branching models, our method makes statistical inferences of branch structures in a probabilistic  ...  Inspired by a conventional tree modeling approach [20] , we develop a branch structure generation method using particle flows.  ... 
doi:10.1109/cvpr.2018.00307 dblp:conf/cvpr/IsokaneOIMY18 fatcat:xoqvhgpi5fb77of6nfg267m3ue

Simulation of phase contrast angiography for renal arterial models

Artur Klepaczko, Piotr Szczypiński, Michał Strzelecki, Ludomir Stefańczyk
2018 BioMedical Engineering OnLine  
In addition, a synthetic model was designed using a vascular tree growth simulation algorithm.  ...  The results embrace a series of synthetic PCA images of the renal arterial trees giving insight into the image formation and quantification of kidney hemodynamics.  ...  Marcin Majos, MD, of the Medical University of Lodz, for collection of the CT angiograms and ultrasound data, which served for constructing patient-specific renal arterial models.  ... 
doi:10.1186/s12938-018-0471-y pmid:29661193 pmcid:PMC5902949 fatcat:whfptduotrebdhl4kvsc2arulq

Numerical simulations of aerosol delivery to the human lung with an idealized laryngeal model, image-based airway model, and automatic meshing algorithm

Shinjiro Miyawaki, Eric A. Hoffman, Ching-Long Lin
2017 Computers & Fluids  
The authors proposed a new method to automatically mesh computed tomography (CT)-based three-dimensional human airway geometry for computational fluid dynamics (CFD)-based simulations of pulmonary gas-flow  ...  Furthermore, most of CT thoracic image data sets do not include the upper airway structures.  ...  When constructing the geometric model, we extended the 1-D tree from the trachea to larynx using the average imaged tracheal diameter.  ... 
doi:10.1016/j.compfluid.2017.02.008 pmid:28959080 pmcid:PMC5612319 fatcat:iyts3nuv5raytksmssxmrjxiaq

A Novel adaptive optimization of Dual-Tree Complex Wavelet Transform for Medical Image Fusion [article]

T.Deepika, G.Karpaga Kannan
2020 arXiv   pre-print
In this paper, a multimodal image fusion algorithm based on the dual-tree complex wavelet transform (DT-CWT) and adaptive particle swarm optimization (APSO) is proposed.  ...  Experiment results show that the proposed method based on adaptive particle swarm optimization algorithm is remarkably better than the method based on particle swarm optimization.  ...  For approximations in DT-CWT domain, use weighted factors to calculate the approximation of the fused image of F.  ... 
arXiv:2007.13538v1 fatcat:k75ctzpzonexlp34gcmsyxkyka

Approximate and probabilistic algorithms for shading and rendering structured particle systems

William T. Reeves, Ricki Blau
1985 Proceedings of the 12th annual conference on Computer graphics and interactive techniques - SIGGRAPH '85  
For example, structured particle systems have been used to generate trees and a grass-covered forest floor.  ...  Recent work in stochastic modelling also enables us to model complex motions with random variation, such as a field of grass blowing in the breeze.  ...  Approximately 1.1 million particles compose the trees in Figure 3 .  ... 
doi:10.1145/325334.325250 dblp:conf/siggraph/ReevesB85 fatcat:lcoorgyqtnendgwdrl2o3lptci
« Previous Showing results 1 — 15 out of 43,228 results