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7th World Congress on Intelligent Control and Automation

作者： Wang, Rui Li, Junshan Liu, Guoqing Li, Xuhui Second Artillery Engn Coll Xian 710025 Shanxi Peoples R China

ISBN: (纸本)9781424421138

Focusing on detail preserving in triangle mesh model simplification, a novel 3d geometric model region partition method based on self-organizing feature map is proposed. Firstly, computing the character vector of each vertex of 3d geometric model. Next;segmenting 3d geometric model preliminarily based on self-organizing feature map. Finally, merging over-segmentation regions used max-relativity rule and getting the last result. Experiment shows that this approach is effective and meets the requirement of keeping local features in model simplification.

关键词： region partition model simplification SOFM 3d geometric model

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3d geometric model Region Partition Method

3D Geometric Model Region Partition Method

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7th World Congress on Intelligent Control and Automation (WCICA 2008), vol.21

作者： Rui Wang Junshan Li Guoqing Liu Xuhui Li Second Artillery Engineering College Xi'an Shanxi China

Focusing on detail preserving in triangle mesh model simplification, a novel 3d geometric model region partition method based on self-organizing feature map is proposed. Firstly, computing the character vector of each vertex of 3d geometric model. Next, segmenting 3d geometric model preliminarily based on self-organizing feature map. Finally, merging over-segmentation regions used max-relativity rule and getting the last result. Experiment shows that this approach is effective and meets the requirement of keeping local features in model simplification.

关键词： Region partition model simplification SOFM 3d geometric model

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Almost automatic method for reconstruction 3d geometric model of the left ventricle from 3d + 1d precordial echocardiogram

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Journal of Medical and Biological Engineering 2001年第2期21卷 127-133页

作者： Ching, Yu-Tai Liu, Yu-Hsian Chang, Chwen-Liang Chen, James S.J. Department of Computer Science National Chiao Tung University Hsinchu 300 Taiwan

Echocardiography is the most convenient means for both physicians and patients for heart disease diagnosis. The 3d+1d echocardiogram provides important information for evaluation of the 3d heart function such as the ejection fraction or the wall motion. The most basic task to evaluate such functions of a heart is to segment the left ventricles and reconstruct the 3d geometric model of left ventricle from a set of echocardiographic images. Since there are many images involved, the method should not need too many user assists. In this work, we design a method for reconstructing the left ventricles with very few user assists.

关键词： α-shape 3d geometric model Echocardiogram Graph algorithm Left Ventricle Snake model

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3d geometric modeling for the Yanjinggou anticline in the Longmen Shan fold-and-thrust belt, China: Oblique thrusting kinematic implications

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JOURNAL OF ASIAN EARTH SCIENCES 2019年第0期179卷 99-111页

作者： Li, Zhigang Zhang, Peizhen Jia, dong Zheng, Wenjun Sun, Chuang Li, Yiquan Almeidad, Rafael Chen, Wei Li, Tao Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Prov Key Lab Geodynam & Geohazards Guangzhou Guangdong Peoples R China Nanjing Univ Sch Earth Sci & Engn Nanjing Jiangsu Peoples R China Nanjing Univ Sch Geog & Ocean Sci Nanjing Jiangsu Peoples R China Yachay Tech Univ Sch Earth Sci Energy & Environm Urcuqui Ecuador Southwest Petr Univ Sch Geosci & Technol Chengdu Sichuan Peoples R China

Three-dimensional (3d) subsurface seismic data acquisition and modeling are rarely undertaken;consequently, the complex effects of oblique thrusting on the 3d morphology and kinematics of folds are still poorly understood. We use 3d seismic data to produce five 3d geometric models and compare our results with structural models of the Yanjinggou anticline in the Longmen Shan fold-and-thrust belt, to investigate the effects of oblique thrusting on 3d fold evolution. 3d geometric modeling results reveal that oblique thrusting may cause fold asymmetry, vertical axis rotation, and a curved fold axis. 3d seismic interpretations and structural modeling suggest that the Yanjinggou anticline developed as a trishear fault-propagation fold and experienced a maximum shortening amount of 1.2 +/- 0.1 km. The 3d structural and geometric models are consistent with paleomagnetic results, suggesting that the anticline was affected by oblique thrusting at an angle of 55 above a listric thrust fault with three fault ramps (19, 30, and 40), causing the fold to rotate and develop a curved morphology. The integrated method used in this study to investigate the effects of oblique thrusting on 3d fold morphology and kinematics can be applied to regional oblique thrusting in the Longmen Shan and other fold-and-thrust belts worldwide.

关键词： Longmen Shan Yanjinggou anticline Oblique thrusting 3d geometric model Fault-propagation fold Paleomagnetic analysis

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A 2d-3d integrated interface for mobile robot control using omnidirectional images and 3d geometric models 06

A 2D-3D integrated interface for mobile robot control using ...

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IEEE/ACM International Symposium on Mixed and Augmented Reality

作者： Saitoh, Kensaku Machida, Takashi Kiyokawa, Kiyoshi Takemura, Haruo Osaka Univ Grad Sch Informat Sci & Technol Osaka Japan Osaka Univ Cybermedia Ctr Grad Sch Informat Sci & Technol Osaka Japan

ISBN: (纸本)9781424406500

This paper proposes a novel visualization and interaction technique for remote surveillance using both 2d and 3d scene data acquired by a mobile robot equipped with an omidirectional camera and an omnidirectional laser range sensor. In a normal situation, telepresence with an egocentric-view is provided using high resolution omnidirectional live video on a hemispherical screen. As depth information of the remote environment is acquired, additional 3d information can be overlaid onto the 2d video image such as passable area and roughness of the terrain in a manner of video see-through augmented reality. A few functions to interact with the 3d environment through the 2d live video are provided, such as path-drawing and path-preview. Path-drawing function allows to plan a robot's path by simply specifying 3d points on the path on screen. Path-preview function provides a realistic image sequence seen from the planned path using a texture-mapped 3d geometric model in a manner of virtualized reality. In addition, a miniaturized 3d model is overlaid on the screen providing an exocentric view, which is a common technique in virtual reality. In this way, our technique allows an operator to recognize the remote place and navigate the robot intuitively by seamlessly using a variety of mixed reality techniques on a spectrum of Milgram's real-virtual continuum.

关键词： remote robot control onmidirectional image 3d geometric model

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Reconstruction of 3d geometric models of pulmonary arteries from cardiac CT images

Reconstruction of 3D geometric models of pulmonary arteries ...

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Medical Imaging 2002 Conference

作者： Yu, CC Ching, YT Chen, SJ Natl Chiao Tung Univ Dept Comp & Informat Sci Hsinchu 30050 Taiwan

ISBN: (纸本)0819444286

We present a method to construct the geometric model of the pulmonary arteries from a set of cardiac CT scan images. It is desired that the model is in rectangular meshes. The main difficulties in this work are insufficient resolution along z-direction, the requirement of the rectangular meshes, and the geometric shape of the pulmonary arteries. We present a method that is based on estimation the medial axis and the radii of the vessel along the axis. We evaluate the proposed method using a phantom data set. The proposed method can achieve good reconstructed result for the phantom data set.

关键词： pulmonary arteries 3d geometric model spline curve CT scan

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Efficient synthesis of arbitrary viewpoint images using 3-d geometric model and mesh-based specular reflection tracing

Efficient synthesis of arbitrary viewpoint images using 3-D ...

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7th IEEE International Symposium on Signal Processing and Information Technology

作者： Nishitani, Kenichiro Sugimura, Gota Kobayashi, Hirokazu Fukuda, Koichi Kawanaka, Akira Sophia Univ Fac Sci & Technol Dept Elect & Elect Engn Chiyoda Ku Kioi Cho 7-1 Tokyo 1028554 Japan Iwaki Meisei Univ Sch Informat Sci Dept Informat Sci Hino Tokyo 1918506 Japan

ISBN: (纸本)9781424418343

A novel image synthesis method of an object at arbitrary viewpoint by using the 3-d geometric model and several camera images is proposed. Although the image-based rendering synthesizes the relatively accurate diffuse reflection component from the camera images from different viewpoints, it can not synthesize the specular reflection component with sufficient accuracy as the movement of the specular reflection component as the changes in viewpoints are not taken into consideration. In order to overcome this problem, we propose a method for synthesizing the arbitrary viewpoint images with the use of the displacement vectors of the specular reflection components. The displacement vectors are estimated by a hexagonal matching algorithm based on the triangle mesh model which was modified for arbitrary shaped images. In the hexagonal matching, the images synthesized from 3-d geometric model of a real object and camera images are used as reference image. The experiments show that the proposed method reconstructs the specular reflection components more accurately and also improves the coding performance compared to the conventional methods.

关键词： arbitrary viewpoint image synthesis 3d geometric model diffuse reflection specular reflection Hexagonal Matching Algorithm

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3d model Hypotheses for Player Segmentation and Rendering in Free-Viewpoint Soccer Video

3D Model Hypotheses for Player Segmentation and Rendering in...

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14th IEEE International Symposium on Multimedia (ISM)

作者： Li, Haopeng Flierl, Markus KTH Royal Inst Technol Sch Elect Engn Stockholm Sweden

ISBN: (纸本)9780769548753

This paper presents a player segmentation approach based on 3d model hypotheses for soccer games. We use a hyperplane model for player modeling and a collection of piecewise geometric models for background modeling. To determine the assignment of each pixel in the image plane, we test it with two model hypotheses. We construct a cost function that measures the fitness of model hypotheses for each pixel. To fully utilize the perspective diversity of the multiview imagery, we propose a three-step strategy to choose the best model for each pixel. The experimental results show that our segmentation approach based on 3d model hypotheses outperforms conventional temporal median and graph cut methods for both subjective and objective evaluation.

关键词： Soccer video segmentation 3d geometric model

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Automatic Extraction of Three-dimensional Thoracic Aorta geometric model from Phase Contrast MRI for Morphometric and Hemodynamic Characterization

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MAGNETIC RESONANCE IN MEdICINE 2016年第2期75卷 873-882页

作者： Volonghi, Paola Tresoldi, daniele Cadioli, Marcello Usuelli, Antonio M. Ponzini, Raffaele Morbiducci, Umberto Esposito, Antonio Rizzo, Giovanna CNR Inst Mol Bioimaging & Physiol Segrate MI Italy Philips Healthcare Monza Italy CINECA Segrate MI Italy Politecn Torino Dept Mech & Aerosp Engn Turin Italy Sci Inst HS Raffaele Dept Radiol Milan Italy

Purpose: To propose and assess a new method that automatically extracts a three-dimensional (3d) geometric model of the thoracic aorta (TA) from 3d cine phase contrast MRI (PCMRI) acquisitions. Methods: The proposed method is composed of two steps: segmentation of the TA and creation of the 3d geometric model. The segmentation algorithm, based on Level Set, was set and applied to healthy subjects acquired in three different modalities (with and without SENSE reduction factors). Accuracy was evaluated using standard quality indices. The 3d model is characterized by the vessel surface mesh and its centerline;the comparison of models obtained from the three different datasets was also carried out in terms of radius of curvature (RC) and average tortuosity (AT). Results: In all datasets, the segmentation quality indices confirmed very good agreement between manual and automatic contours (average symmetric distance < 1.44 mm, dICE Similarity Coefficient > 0.88). The 3d models extracted from the three datasets were found to be comparable, with differences of less than 10% for RC and 11% for AT. Conclusion: Our method was found effective on PCMRI data to provide a 3d geometric model of the TA, to support morphometric and hemodynamic characterization of the aorta. (C) 2015 Wiley Periodicals, Inc.

关键词： thoracic aorta phase contrast MRI level set segmentation 3d geometric model

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geometric modeling of terry fabric

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INTERNATIONAL JOURNAL OF CLOTHING SCIENCE ANd TECHNOLOGY 2015年第2期27卷 237-246页

作者： Singh, Jitendra Pratap Behera, Bijoya Kumar UP Text Technol Inst Dept Text Technol Kanpur Uttar Pradesh India Indian Inst Technol Delhi Dept Text Technol New Delhi India

Purpose - The purpose of this paper is to develop a 3d geometric model of three- pick terry fabric considering the actual design and structural features of the finished terry fabric. design/methodology/approach - The model has been developed using SolidWorks CAd system and the output file can be easily simulated in the ANSYS. dimensions are acquired from the actual terry fabric measurement. Findings - A 3d computational model - to be used for understanding the behaviour of terry fabric during actual use through the simulation in ANSYS. Practical implications - Provides the way to study the yarn and fabric structure behaviour during use through simulation. Originality/value - The research resulted a 3d geometrical model of very complex three-pick terry fabric for very first time for further analysis of terry fabric behaviour during use.

关键词： Three-pick terry fabric 3d geometric model Fabric behaviour Solidworks

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