Complete 3D Modeling from Rotational Devices

2011 ◽  
Vol 317-319 ◽  
pp. 843-846
Author(s):  
Sheng Yong Chen ◽  
Da Wei Liu ◽  
Xiao Yan Wang ◽  
Wei Huang ◽  
Qiu Guan
Keyword(s):  
Linear Transformation ◽  
3D Modeling ◽  
3D Models ◽  
Image Sequences ◽  
Reconstruction Method ◽  
Projective Reconstruction ◽  
Complete Model ◽  
The Common

For acquisition of complete 3D models, this paper uses a rotational device to capture a set of image sequences. A direct projective reconstruction method is proposed by linear transformation, which can avoid getting corresponding points in more than two images. Actually, projective reconstructions are obtained from two neighboring images and the reconstructions are combined with the common 3D points. Finally, all reconstructions are merged into the initial one to construct a complete model. Several practical experiments have been carried out to validate the accuracy of the method.

scholarly journals ENHANCED RGB-D MAPPING METHOD FOR DETAILED 3D MODELING OF LARGE INDOOR ENVIRONMENTS

2016 ◽  
Vol III-1 ◽  
pp. 151-158
Author(s):  
Shengjun Tang ◽  
Qing Zhu ◽  
Wu Chen ◽  
Walid Darwish ◽  
Bo Wu ◽  
...  
Keyword(s):  
3D Modeling ◽  
Visual Information ◽  
3D Models ◽  
Measurement Range ◽  
Mapping Method ◽  
Depth Information ◽  
Indoor Environments ◽  
Recovery Method ◽  
Depth Measurement ◽  
Rgb Image

RGB-D sensors are novel sensing systems that capture RGB images along with pixel-wise depth information. Although they are widely used in various applications, RGB-D sensors have significant drawbacks with respect to 3D dense mapping of indoor environments. First, they only allow a measurement range with a limited distance (e.g., within 3 m) and a limited field of view. Second, the error of the depth measurement increases with increasing distance to the sensor. In this paper, we propose an enhanced RGB-D mapping method for detailed 3D modeling of large indoor environments by combining RGB image-based modeling and depth-based modeling. The scale ambiguity problem during the pose estimation with RGB image sequences can be resolved by integrating the information from the depth and visual information provided by the proposed system. A robust rigid-transformation recovery method is developed to register the RGB image-based and depth-based 3D models together. The proposed method is examined with two datasets collected in indoor environments for which the experimental results demonstrate the feasibility and robustness of the proposed method

scholarly journals How many lived to maturity?

1993 ◽  
pp. 16-24
Author(s):  
Eino Jutikkala
Keyword(s):  
Children And Adolescents ◽  
Social Groups ◽  
Child And Adolescent ◽  
Reconstruction Method ◽  
Family Reconstruction ◽  
The Family ◽  
The Common

Calculations have been made of the total child and adolescent mortality in Finland in the 1700s and 1800s and the beginning of the 1900s. The author examines the cohort mortality of children and adolescents in different periods, regions and social groups. He does this by using the family reconstruction method with the aid of genealogical tables. The study focuses on five populations. In these cases the common allegation that during preindustrial period half the children died before reaching maturity is somewhat exaggerated.

Image Based 3D Modeling and Rendering from Single View Perspective Images

2013 ◽  
pp. 604-620
Author(s):  
S. Mohan ◽  
S. Murali
Keyword(s):  
Computer Vision ◽  
3D Modeling ◽  
Real World ◽  
3D Models ◽  
Edge Length ◽  
Geometric Information ◽  
Single View ◽  
Perspective Image ◽  
Cad Cam ◽  
Cam Software

In computer vision, 3D modeling refers to the process of developing 3D representation of the real world objects with systematic procedure. The 3D models can be built based on geometric information about the object or scene to be modeled using CAD/CAM software. However, this approach needs prior knowledge of the objects in the scene like dimension, size of objects, distance from the object to camera, et cetera. To make the 3D models more photo realistic and convenient, images of the objects can be used to build the 3D models. In this chapter, the authors propose a method to extract 3D model from single view perspective image. The approach is based on edge length and exploiting symmetric objects in the scene. Later, an application of touring into picture is discussed with the proposed method.

Design and Development of 3D Printed Teaching Aids for Architecture Education

2019 ◽  
pp. 457-475
Author(s):  
Min Jeong Song ◽  
Euna Ha ◽  
Sang-Kwon Goo ◽  
JaeKyung Cho
Keyword(s):  
3D Printing ◽  
3D Modeling ◽  
3D Models ◽  
Design And Development ◽  
Architecture Education ◽  
Teaching Aids ◽  
Current State ◽  
Practice Based Research ◽  
Research Findings ◽  
3D Printed

This article describes how the implementation of 3D printing in classrooms has brought many opportunities to educators as it provides affordability and accessibility in creating and customizing teaching aids. The study reports on the process of fabricating teaching aids for architecture education using 3D printing technologies. The practice-based research intended to illustrate the making process from initial planning, 3D modeling to 3D printing with practical examples, and addresses the potential induced by the technologies. Based on the investigation into the current state of 3D printing technologies in education, limitations were identified before the making process. The researchers created 3D models in both digital and tangible forms and the process was documented in textual and pictorial formats. It is expected that the research findings will serve as a guideline for other educators to create 3D printed teaching aids, particularly architectural forms.

Development of a 4D Visualization Tool for Construction Planning

2011 ◽  
pp. 13-21
Author(s):  
Takanori Terashma ◽  
Koji Makanae ◽  
Nashwan Dawood
Keyword(s):  
3D Modeling ◽  
Work Performance ◽  
3D Models ◽  
Project Schedule ◽  
Construction Planning ◽  
Progress Control ◽  
Material Data ◽  
Related Information ◽  
Work Style ◽  
Modeling Data

This chapter presents the implementation of a system that visualizes the construction process using 3D modeling data and schedule data to analyze construction planning. Previous papers have emphasized the benefits of visual 4D planning that combines 3D modeling data and process schedule data for work progress control. The proposed methodology offers rapid visualization of work performance with scheduled activity and facilitates construction planning and schedule inspection. Consequently, it should increase productivity and reduce rework. However, even major construction companies will not adopt such a work style, because the existing, well-organized way of working would not be readily changed unless the new style is proven to afford benefits that outweigh the effort and cost required to adapt to the style. The advanced CAD system, for example, is able to simulate the assembly process, and the advanced 3D graphic designer is able to animate the arrangement of objects. Even though each software provides multiple functionalities, the applications in practical use are all independent and specific, such as CAD for designing 3D models, and a project manager for scheduling and analyzing. Therefore, a system that integrates all outputs from each application is required to move from the conventional work style to the new one. This chapter, thus, aims to develop a system that integrates several types of data and enables the simulation of the construction progress by gradually showing 3D models according to the activity schedule. It is also possible to attach material data to each object and to display related information like cost and object properties. The system assumes the following requirements: (1) to import and display the 3D modeling data, (2) to import the project schedule, (3) to link each model and activity, (4) to give the material data on each object to enhance reality, and (5) to show cost accumulation. These functions are supposed to be realized such that the system utilizes the resources previously reserved. Therefore, the system should be able to import a DXF format file for 3D modeling data and access the MDB format database for the project schedule, including costs. The MDB file is originally a database that Microsoft Access creates. Microsoft Project, which is probably the most widely used software for project management, is also able to export the project data in this format. These functions are implemented with Microsoft Visual C++ and DirectX SDK. Although the system displays inaccurate models partially because of the misinterpretation of the DXF file, all of the demands listed above are satisfied currently. The authors of this chapter are now at the stage of implementation of further functions, that is, to display not only structures but also other elements such as the temporal space on the site, the route of delivery vehicles, and the work area of the temporally used heavy machinery, all for the sake of the visualization and analysis of the entire construction site.

Three-Dimensional Modelling for Cultural Heritage

2021 ◽  
pp. 418-443
Author(s):  
Luis Marques ◽  
Josep Roca
Keyword(s):  
Augmented Reality ◽  
3D Modeling ◽  
Three Dimensional ◽  
Human Perception ◽  
3D Models ◽  
3D Modelling ◽  
Digital Archives ◽  
Spatial Environment ◽  
The City ◽  
Model Visualization

The creation of 3D models of urban elements is extremely relevant for urbanists constituting digital archives and being especially useful for enriching maps and databases or reconstructing and analyzing objects/areas through time, building/recreating scenarios and implementing intuitive methods of interaction. The widespread data available online offer new opportunities to generate realistic 3D models without the need to go physically to the place. This chapter aims to demonstrate the potential 3D modeling and visualization/interaction of urban elements in the city for multiple purposes, and it is organized in four main topics: The first deals with the theoretical framework regarding the bases of the human perception of the spatial environment and the importance of 3D modelling. The second and third deal with technical procedures on terrestrial/aerial data acquisition and demonstrate alternatively data gathered online to generate 3D models for the visualization of urban elements of the city, and the fourth introduces 3D model visualization within an augmented reality environment.

3D Modeling for Environmental Informatics

2015 ◽  
pp. 199-218
Author(s):  
Xiaozheng Zhang ◽  
Yongsheng Gao
Keyword(s):  
3D Modeling ◽  
Image Representation ◽  
Synthetic Data ◽  
3D Models ◽  
3D Object ◽  
Convex Object ◽  
Dimensional Linear Subspace ◽  
Environmental Informatics ◽  
Pixel Image ◽  
Tool Set

3D modeling plays an important role in the field of computer vision and image processing. It provides a convenient tool set for many environmental informatics tasks, such as taxonomy and species identification. This chapter discusses a novel way of building the 3D models of objects from their varying 2D views. The appearance of a 3D object depends on both the viewing directions and illumination conditions. What is the set of images of an object under all viewing directions? In this chapter, a novel image representation is proposed, which transforms any n-pixel image of a 3D object to a vector in a 2n-dimensional pose space. In such a pose space, it is proven that the transformed images of a 3D object under all viewing directions form a parametric manifold in a 6-dimensional linear subspace. With in-depth rotations along a single axis in particular, this manifold is an ellipse. Furthermore, it is shown that this parametric pose manifold of a convex object can be estimated from a few images in different poses and used to predict object's appearances under unseen viewing directions. These results immediately suggest a number of approaches to object recognition, scene detection, and 3D modeling, applicable to environmental informatics. Experiments on both synthetic data and real images were reported, which demonstrates the validity of the proposed representation.

Real/Not Real

2017 ◽  
pp. 201-227 ◽  
Author(s):  
Paolo Clini ◽  
Ramona Quattrini ◽  
Emanuele Frontoni ◽  
Roberto Pierdicca ◽  
Romina Nespeca
Keyword(s):  
Cultural Heritage ◽  
Data Acquisition ◽  
3D Modeling ◽  
Ad Hoc ◽  
3D Models ◽  
Large Set ◽  
Modeling Tools ◽  
3D Reconstructions ◽  
Research Challenge ◽  
State Of Art

Recent advances in data acquisition techniques and modeling tools lead towards a large availability of digital 3D models. Cultural Heritage domain, and particularly Architecture and Archaeology Heritage (AAH) significantly benefits from the introduction of digital 3D modeling, which represents a means of communication and dissemination. An underlying research challenge is represented by the portability of complex artifact, making them suitable for a large set of devices (e.g. mobile devices). The aim of this chapter is to outline best practices for the correct visualization of the 3D reconstructions of architectural and cultural heritage, especially for Mobile Augmented Reality and Holographic applications. A complete methodology is presented, ranging from data acquisition, simplification and visualization, underlining the importance of fostering architectural values in a compelling way. Authors also provide state of art challenges, limitations and opportunities, arguing the dissertation through a set of ad-hoc applications developed for different case studies.

scholarly journals Innovációs lehetőségek a medicinában: 3D tervezési és 3D nyomtatási lehetőségek a felnőtt szív- és mellkassebészeti betegellátásban. Magyarországi tapasztalatok

2019 ◽  
Vol 160 (50) ◽  
pp. 1967-1975 ◽  
Author(s):  
János Imre Barabás ◽  
Áron Kristóf Ghimessy ◽  
Ferenc Rényi-Vámos ◽  
Ákos Kocsis ◽  
László Agócs ◽  
...  
Keyword(s):  
Clinical Case ◽  
Technology Development ◽  
3D Models ◽  
Patient Specific ◽  
Anatomical Models ◽  
Efficient Communication ◽  
The Common ◽  
Case Discussions ◽  
Procedural Planning ◽  
Surgery Department

Abstract: Use of 3D planning and 3D printing is expanding in healthcare. One of the common applications is the creation of anatomical models for the surgical procedure from DICOM files. These patient-specific models are used for multiple purposes, including visualization of complex anatomical situations, simulation of surgical procedures, patient education and facilitating communication between the different disciplines during clinical case discussions. Cardiac and thoracic surgical applications of this technology development include the use of patient-specific 3D models for exploration of ventricle and aorta function and surgical procedural planning in oncology. The 3D virtual and printed models provide a new visualization perspective for the surgeons and more efficient communication between the different clinical disciplines. The 3D project was started at the Semmelweis University with the cooperation of the Thoracic Surgery Department of the National Institute of Oncology in 2018. The authors want to share their experiences in 3D designed medical tools. Orv Hetil. 2019; 160(50): 1967–1975.

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