3-D Object Projection Method of Multi-Camera Revolve Batch Rendering

2012 ◽  
Vol 256-259 ◽  
pp. 2894-2897
Author(s):  
Xiao Ming Bai ◽  
Xiao Fang Xie ◽  
Ji Hong Yu
Keyword(s):  
Projection Method ◽  
Recognition Rate ◽  
Three Dimensional ◽  
Random Projection ◽  
Three Dimensional Objects ◽  
Space Projection ◽  
Projection Images ◽  
Three Dimensional Models ◽  
Set Up ◽  
Moving Path

3-D object recognition was different from 2-D one. In order to improve recognition rate, it was necessary to establish a full features base. With object as center, the paper offered a view space projection method of Multi-Camera Revolve Batch Rendering. Firstly, constructed three dimensional models for object, set positions for model and camera of top view. Then by the max panel stick to one of axis angle, copied camera with equal interval. Set up the moving path for hemisphere, and constraint to corresponding camera. In the last, established batch script with output parameters, automatic preservation random projection images for three dimensional objects.

A brief history of the filling simulation of injection moulding

2008 ◽  
Vol 223 (3) ◽  
pp. 711-721 ◽  
Author(s):  
D Cardozo
Keyword(s):  
Computer Simulation ◽  
Injection Moulding ◽  
Three Dimensional ◽  
History Of ◽  
Dimensional Models ◽  
Three Dimensional Models ◽  
Set Up ◽  
Filling Simulation ◽  
Basic Features ◽  
Plastic Parts

Injection moulding is one of the most important manufacturing processes for mass production of complex plastic parts. The quality of injection moulded parts depends not only on the material, shape, and function of the part design, but also on how the material is processed during moulding. Traditional design approaches based on intuition, prior experience, and trial-and-error methodology have been becoming less efficient and effective. With advances in numerical modelling and computer simulation techniques, there have been tremendous efforts made to develop computer simulation tools to facilitate injection moulding design and process set-up. This paper reviews the history of research and development in the filling simulation of injection moulding. The existing models are classified into three categories: one-dimensional models, 2.5D models, and three-dimensional models. The basic features and relative key techniques about these models have been discussed. The techniques of tacking the moving flow front have also been presented. It is then followed by conclusions and discussions of these mentioned models.

Semi-automatic calibration procedure for the vision-robot interface applied to scale model decoration

Robotica ◽  
1992 ◽  
Vol 10 (4) ◽  
pp. 303-308
Author(s):  
Luis Gonzaga Trabasso ◽  
Cezary Zielinski
Keyword(s):  
Three Dimensional ◽  
Robot Vision ◽  
Work Load ◽  
Calibration Procedure ◽  
Scale Model ◽  
Three Dimensional Objects ◽  
University Of Technology ◽  
Scale Models ◽  
Set Up ◽  
Small Work

SUMMARYA semi-automatic method for calibrating a robot-vision interface is presented. It puts a small work-load on the operator, requires a simple calibration jig and a solution of a very simple system of equations. It has been extensively used in an experimental robotic cell set up at Loughborough University of Technology, where various aspects of the manufacturing and the decoration of scale models are being investigated. As an extension of the calibration procedure, the paper also shows practical solutions for the problem of dealing with three dimensional objects using a single camera.

Automated matching of high- and low-resolution structural models

2001 ◽  
Vol 34 (1) ◽  
pp. 33-41 ◽  
Author(s):  
M. B. Kozin ◽  
D. I. Svergun
Keyword(s):  
Electron Microscopy ◽  
Quantitative Estimate ◽  
Three Dimensional ◽  
Structural Models ◽  
Proximity Measure ◽  
Low Resolution ◽  
Three Dimensional Objects ◽  
Atomic Structures ◽  
Three Dimensional Models ◽  
Model Structures

A method is presented for automated best-matching alignment of three-dimensional models represented by ensembles of points. A normalized spatial discrepancy (NSD) is introduced as a proximity measure between three-dimensional objects. Starting from an inertia-axes alignment, the algorithm minimizes the NSD; the final value of the NSD provides a quantitative estimate of similarity between the objects. The method is implemented in a computer program. Simulations have been performed to test its performance on model structures with specified numbers of points ranging from a few to a few thousand. The method can be used for comparative analysis of structural models obtained by different methods,e.g.of high-resolution crystallographic atomic structures and low-resolution models from solution scattering or electron microscopy.

Synthesis of Three-Dimensional Models from Drawings Based on Spectral Graph Theory

2015 ◽  
Vol 756 ◽  
pp. 598-603 ◽  
Author(s):  
Aleksey Zakharov ◽  
Arkady Zhiznyakov
Keyword(s):  
Graph Theory ◽  
Three Dimensional ◽  
Spectral Graph Theory ◽  
Boundary Representation ◽  
Three Dimensional Model ◽  
Three Dimensional Objects ◽  
Spectral Graph ◽  
Dimensional Models ◽  
Three Dimensional Models

Task of automatic reconstruction of three-dimensional objects by drawing views presented. The algorithm based on a boundary representation of three-dimensional models. The algorithm consists of the following steps: automatic separation of the drawing per the views, determination of three-dimensional coordinates of vertices, definition and marking of wire model primitives, reconstruction of model faces and model elements. The fundamental concept of the algorithm is to find the structural elements of three-dimensional model with usage of pre-specified patterns. The templates are described by means of matrices. Matching algorithm uses spectral graph theory. Reconstruction results are presented.

scholarly journals 24 hours – High-Throughput Crystal Structure Production

2014 ◽  
Vol 70 (a1) ◽  
pp. C695-C695
Author(s):  
Trixie Wagner ◽  
Markus Kroemer ◽  
Berthold Grunwald
Keyword(s):  
Data Collection ◽  
Crystal Structures ◽  
Three Dimensional ◽  
Pixel Detector ◽  
Full Data ◽  
Data Set ◽  
High Resolution Data ◽  
First Results ◽  
Three Dimensional Models ◽  
Set Up

In the pharmaceutical industry crystal structures of low molecular weight compounds are analyzed for a variety of reasons: absolute structure determination, proof of constitution, characterization of different polymorphic forms, obtaining three-dimensional models as starting points for the study of structure-activity relationships, etc. Not for all purposes highly redundant, high-resolution data sets are needed; this thought, together with the purchase of a new hybrid pixel detector which can be operated in a very fast shutterless mode, initiated the idea to test how many useable crystal structures we can produce within 24 hours. Our goal was to invest as little effort as possible and to set up an automated process with minimal human intervention but a maximum chance of success which we defined as getting to a correct final result providing useful information, e.g., is it the correct compound? Is the sample chiral or racemic? Which crystal would be the best one for a full data collection? Is it a new polymorph? We selected a data collection protocol which yields an interpretable data set up to 1 Å resolution in less than 10 minutes, the diffraction images are indexed and processed using an in-house script arching over the necessary individual XDS steps, followed by space group determination (XPREP) and structure solution/refinement (SHELX). First results and findings of our experiment series will be presented and the adjustable parameters will be discussed. Ideas to adapt and improve the process will be offered.

Seismic Safety Margin of an Isolated SMR Reactor Under Severe Earthquake

2011 ◽  
Author(s):  
Rosa Lo Frano ◽  
Giuseppe Forasassi ◽  
Alessandro Poggianti ◽  
Massimo Forni
Keyword(s):  
Nuclear Power ◽  
Seismic Isolation ◽  
Seismic Event ◽  
Three Dimensional ◽  
Safety Margin ◽  
Seismic Safety ◽  
Extreme Loads ◽  
Wide Range ◽  
Three Dimensional Models ◽  
Set Up

The dramatic consequence of the magnitude 9.0 earthquake in Fukushima Daiichi nuclear power plant, reactors 1, 2, 3 and 4, highlighted and confirmed that the existing and the future nuclear installations should be designed to be highly secure and capable to withstand a wide range of internal and external extreme loads, such as pressure, aircraft crash and, of course, earthquakes. The aim of this paper is the evaluation the seismic behavior of an innovative SMR hit by an exceptional seismic event, characterized by a magnitude well beyond the design basis value (e.g. also 2007 Niigataken Chuetsu-Oki or 2010 Chile earthquakes), in order to understand the true state of the SSCs in terms of their required safety functions and capacity, and, as a result, to be able to assess correctly the seismic safety margin of the considered installation. In this context, it has been also considered the adoption of the highly attractive strategy of the seismic isolation to increase the reliability or safety margin of the nuclear safety relevant structures, during and after the seismic event, with the aim of avoiding or mitigating the related structural damaging effects. To the purpose a rather refined numerical methodology was employed and several three-dimensional models (FEM approach) of the SMR reactor containment and its safety relevant structures were set up and used in the performed analyses, taking also into account a suitable materials behaviour and constitutive laws for both the reactor materials and the isolators. In addition the real behaviour and characteristics of isolators, experimentally determined, have been used as input in the carried out simulations. The obtained results were used to appropriately check mainly the NPP containment strength reserve and the isolators safety factor.

How much is there really? Why stereology is essential in lung morphometry

2007 ◽  
Vol 102 (1) ◽  
pp. 459-467 ◽  
Author(s):  
Ewald R. Weibel ◽  
Connie C. W. Hsia ◽  
Matthias Ochs
Keyword(s):  
Quantitative Data ◽  
Functional Performance ◽  
Three Dimensional ◽  
Specimen Preparation ◽  
Three Dimensional Objects ◽  
Lung Structure ◽  
Lung Morphometry ◽  
Set Up ◽  
Function Models ◽  
Free Set

Quantitative data on lung structure are essential to set up structure-function models for assessing the functional performance of the lung or to make statistically valid comparisons in experimental morphology, physiology, or pathology. The methods of choice for microscopy-based lung morphometry are those of stereology, the science of quantitative characterization of irregular three-dimensional objects on the basis of measurements made on two-dimensional sections. From a practical perspective, stereology is an assumption-free set of methods of unbiased sampling with geometric probes, based on a solid mathematical foundation. Here, we discuss the pitfalls of lung morphometry and present solutions, from specimen preparation to the sampling scheme in multiple stages, for obtaining unbiased estimates of morphometric parameters such as volumes, surfaces, lengths, and numbers. This is demonstrated on various examples. Stereological methods are accurate, efficient, simple, and transparent; the precision of the estimates depends on the size and distribution of the sample. For obtaining quantitative data on lung structure at all microscopic levels, state-of-the-art stereology is the gold standard.

Research on the System for Fire and Personal Evacuation of Ancient Building Based on Virtual Simulation

2014 ◽  
Vol 1010-1012 ◽  
pp. 284-287 ◽  
Author(s):  
Yi Lin Bei ◽  
De Yun Yang ◽  
Xiang Ren
Keyword(s):  
Virtual Reality ◽  
Three Dimensional ◽  
Market Value ◽  
Virtual Simulation ◽  
Display System ◽  
Virtual Reality Technology ◽  
Historic Building ◽  
Three Dimensional Display ◽  
Three Dimensional Models ◽  
Set Up

With the help of three-dimensional display system and interactive device, virtual reality technology can make people have the feeling of being personally on the scene intuitionally. This paper aims to set up three-dimensional models of ancient building complex and crowds, and simulate the three-dimensional visualization of fire scene’s spreading in historic building and crowd’s evacuation. The system uses FDS to simulate and collect information, designs to evacuate calculation engine and simulates distribution of scenes concerned and personnel behavior feature through virtual reality performance module. The experiment indicates that the system can be used for virtual wandering of scenic spots of ancient architectural complex, and simulate fireproofing scenes, which not only possesses great market value, but also provides decision basis for relevant departments.

scholarly journals Curvature Adaptive 3D Scanning Transformation Calculation

2018 ◽  
Vol 62 (4) ◽  
pp. 107-116
Author(s):  
Adrián Mezei ◽  
Tibor Kovács
Keyword(s):  
Real Time ◽  
Point Cloud ◽  
Three Dimensional ◽  
Point Clouds ◽  
3D Scanning ◽  
Laser Line ◽  
3D Scanner ◽  
Three Dimensional Objects ◽  
Laser Scanners ◽  
Set Up

Three-dimensional objects can be scanned by 3D laser scanners that use active triangulation. These scanners create three-dimensional point clouds from the scanned objects. The laser line is identified in the images, which are captured at given transformations by the camera, and the point cloud can be calculated from these. The hardest challenge is to construct these transformations so that most of the surface can be captured. The result of a scanning may have missing parts because either not the best transformations were used or because some parts of the object cannot be scanned. Based on the results of the previous scans, a better transformation plan can be created, with which the next scan can be performed. In this paper, a method is proposed for transforming a special 3D scanner into a position from where the scanned point can be seen from an ideal angle. A method is described for estimating this transformation in real-time, so these can be calculated for every point of a previous scan to set up a next improved scan.

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