scholarly journals 3D SHAPE ACQUISITION USING AN FTP-BASED METHOD IN PRODUCT MODELING

2011 ◽  
Author(s):  
Chunsheng Yu ◽  
Lushen Wu ◽  
Qingjin Peng
Keyword(s):  
Reverse Engineering ◽  
Three Dimensional ◽  
Product Modeling ◽  
Simple Method ◽  
3D Object ◽  
3D Shape ◽  
Two Dimensional Image ◽  
Shape Acquisition ◽  
3D Data ◽  
Cad Cam

Three-dimensional (3D) shape modeling is one of the most fundamental processes in CAD/CAM systems. There is a variety of methods to build 3D shapes for product design and manufacturing. The methods include defining a 3D object using solid or feature modeling methods, or building a 3D shape of the existing object using reverse engineering techniques. Image-based shape recovery techniques provide effective tools in reverse engineering to acquire 3D data of objects. This paper reports a simple method to reconstruct a 3D object from its 2D (two-dimensional) image for the product modeling. A method based on FTP (Fourier Transform Profilometry) phase analysis is proposed to measure the 3D surface of an object. The comparison of the FTP method with other methods is discussed and the process of the FTP method is provided. The experiment shows the accuracy and speed of the method.

Methods of 3D Object Shape Acquisition

2013 ◽  
pp. 473-497
Author(s):  
Pavel Zemcik ◽  
Michal Spanel ◽  
Premysl Krsek ◽  
Miloslav Richter
Keyword(s):  
Surface Shape ◽  
Optical Methods ◽  
Object Shape ◽  
3D Object ◽  
Single View ◽  
Shape Acquisition ◽  
3D Data ◽  
3D Data Processing ◽  
Shape Processing ◽  
Surface Image

This chapter contains an overview of methods for a 3D object shape from both the surface and the internal structure of the objects. The acquisition methods of interest are optical methods based on objects surface image processing and CT/NMR sensors that explore the object volume structure. The chapter also describes some methods for 3D shape processing. The focus is on 3D surface shape acquisition methods based on multiple views, methods using single view video sequences, and methods that use a single view with a controlled light source. In addition, the volume methods represented by CT/NMR are covered as well. A set of algorithms suitable for the acquired 3D data processing and simplification are shown to demonstrate how the models data can be processed. Finally, the chapter discusses future directions and then draws conclusions.

scholarly journals 3D DIGITIZING TECHNOLOGY IN PRODUCT REVERSE DESIGN

2011 ◽  
Author(s):  
Qingjin Peng ◽  
Hector Sanchez
Keyword(s):  
Shape Recovery ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Coordinate Measuring Machine ◽  
Cost Effective ◽  
3D Shape ◽  
3D Data ◽  
Cost Effective Approach ◽  
Measuring Machine ◽  
And Performance

The reverse design develops new products based on the improvement of existing products. The shape recovery of three-dimensional (3D) objects is the basis of the product reverse design. 3D digitization technology is an important tool for the 3D shape recovery. This paper analyses the current 3D data acquisition technology. The accuracy and performance of the 3D laser scanner is evaluated. A cost-effective approach is proposed to recover 3D shape of objects using a structured-light technique. Details of the proposed method are described. Application examples are presented. The accuracy is evaluated using a coordinate measuring machine.

scholarly journals PVRNet: Point-View Relation Neural Network for 3D Shape Recognition

2019 ◽  
Vol 33 ◽  
pp. 9119-9126 ◽  
Author(s):  
Haoxuan You ◽  
Yifan Feng ◽  
Xibin Zhao ◽  
Changqing Zou ◽  
Rongrong Ji ◽  
...  
Keyword(s):  
Point Cloud ◽  
Shape Recognition ◽  
Three Dimensional ◽  
Feature Representation ◽  
Research Attention ◽  
Single View ◽  
3D Shape ◽  
3D Data ◽  
Effective Network ◽  
Fusion Feature

Three-dimensional (3D) shape recognition has drawn much research attention in the field of computer vision. The advances of deep learning encourage various deep models for 3D feature representation. For point cloud and multi-view data, two popular 3D data modalities, different models are proposed with remarkable performance. However the relation between point cloud and views has been rarely investigated. In this paper, we introduce Point-View Relation Network (PVRNet), an effective network designed to well fuse the view features and the point cloud feature with a proposed relation score module. More specifically, based on the relation score module, the point-single-view fusion feature is first extracted by fusing the point cloud feature and each single view feature with point-singe-view relation, then the pointmulti- view fusion feature is extracted by fusing the point cloud feature and the features of different number of views with point-multi-view relation. Finally, the point-single-view fusion feature and point-multi-view fusion feature are further combined together to achieve a unified representation for a 3D shape. Our proposed PVRNet has been evaluated on ModelNet40 dataset for 3D shape classification and retrieval. Experimental results indicate our model can achieve significant performance improvement compared with the state-of-the-art models.

Methods of 3D Object Shape Acquisition

2012 ◽  
pp. 1-27
Author(s):  
Pavel Zemcik ◽  
Michal Spanel ◽  
Premysl Krsek ◽  
Miloslav Richter
Keyword(s):  
Surface Shape ◽  
Optical Methods ◽  
Object Shape ◽  
3D Object ◽  
Single View ◽  
Shape Acquisition ◽  
3D Data ◽  
3D Data Processing ◽  
Shape Processing ◽  
Surface Image

This chapter contains an overview of methods for a 3D object shape from both the surface and the internal structure of the objects. The acquisition methods of interest are optical methods based on objects surface image processing and CT/NMR sensors that explore the object volume structure. The chapter also describes some methods for 3D shape processing. The focus is on 3D surface shape acquisition methods based on multiple views, methods using single view video sequences, and methods that use a single view with a controlled light source. In addition, the volume methods represented by CT/NMR are covered as well. A set of algorithms suitable for the acquired 3D data processing and simplification are shown to demonstrate how the models data can be processed. Finally, the chapter discusses future directions and then draws conclusions.

As-Built Product Modeling and Reverse Engineering in Shipbuilding Through Combined Digital Photogrammetry and CAD/CAM Technology

2003 ◽  
Vol 19 (02) ◽  
pp. 98-104
Author(s):  
Michael Goldan ◽  
Robert J. G. A. Kroon
Keyword(s):  
Reverse Engineering ◽  
Computer Aided Design ◽  
Lead Time ◽  
Product Information ◽  
Offshore Structures ◽  
Manual Labor ◽  
Digital Photogrammetry ◽  
Product Modeling ◽  
Cad Cam ◽  
Ship Repair

Ship repair, as a technological "lesser brother" of shipbuilding, still contains major elements of manual labor. In the past years, ship repair and the conversion of ships and offshore structures came to rely increasingly on modern computer-aided design and manufacturing (CAD and CAM) information systems for speedy generation of the required engineering information. An often-encountered problem is the lack of product information in electronic form or in any other form. Such information is needed for engineering of new parts for damaged or converted ships and platforms. In such cases one needs to build the virtual product model from the existing as-built object up to an engineering-detail level; hence, the terms "as-built modeling" and "reverse engineering." The paper presents the results of a multiyear project with the code name AMORES, which focuses on improving lead time and economic efficiency in ship and offshore platform repair and conversion in the Netherlands. Existing and newly developed photogrammetric measuring techniques were used to generate as-built models of double curved three-dimensional surfaces of ships and platforms. These were fed into standard CAD/CAM systems to engineer and manufacture new ship hull or platform parts to replace damaged areas. The main advantages of the new method are savings in lead time (measurements, engineering) and the replacing of costly manual labor by modern digital photogrammetry. The paper will focus on the new developments, the experienced difficulties, and the advantages of this new technique in ship repair.

Application of Pro/Engineer in Mug Product Development and Mould Design

2014 ◽  
Vol 722 ◽  
pp. 254-257
Author(s):  
Feng Chen
Keyword(s):  
High Efficiency ◽  
Parametric Design ◽  
Three Dimensional ◽  
Parametric Modeling ◽  
Mold Design ◽  
Product Modeling ◽  
Modeling Technology ◽  
Cad Cam ◽  
Mould Design ◽  
New Generation

Pro/E was developed by the American company PTC CAD / CAM software, it is a new generation product modeling system with features as parametric design, three-dimensional solid model, feature-driven and single database. Pro/E software uses object-oriented unified database and parametric modeling technology, which has conceptual design, basic design and detailed design features,and provides excellent platforms for integrated manufacturing molds.Take Mug for example, the process of product modelling and mold design used by Pro/E software was introduced. The mold design cycle , the parting surface, the mold die space and the core was focused. The high efficiency characteristic of plastic mold design used by Pro/E was elaborated.

Computer-aided analytic and visualization tools for atructural studies

1993 ◽  
Vol 51 ◽  
pp. 496-497
Author(s):  
Bridget Carragher
Keyword(s):  
Three Dimensional ◽  
Computer Software ◽  
Atomic Scale ◽  
Dimensional Structure ◽  
Data Set ◽  
Two Dimensional Image ◽  
Atomic Force ◽  
3D Data ◽  
Wide Range ◽  
Electron Microscopes

Structural biologists typically acquire data in the form of a two-dimensional image (or set of images) from which the three-dimensional structure of the object of interest must be inferred. Examples can be found over a range of sizes spanning many orders of magnitude, and covering structures from the macroscopic to the atomic scale. A correspondingly wide range of different instruments is used in the collection of this data, from CT/MRI scanners, through light and electron microscopes, and recently, atomic force instruments. The images which are collected from these instruments may be in the form of a series of 2D slices through the 3D data set (and these may be either physical sections or optical sections) or a series of to mographic 2D projections of the 3D dataset. In either case it is highly likely that computer software tools will be used on the data set eitheras an aid in the qualitative interpretation of the structure or as a means of extracting quantitative morphological measurements.

The Design of Injection Mold for the Handset Based on Reverse Engineering

2012 ◽  
Vol 591-593 ◽  
pp. 219-222
Author(s):  
Huai Xing Wen ◽  
Qian Xin Wei
Keyword(s):  
Reverse Engineering ◽  
Rapid Development ◽  
Three Dimensional ◽  
Injection Mold ◽  
Engineering Technology ◽  
Cloud Data ◽  
Important Trend ◽  
Cad Cam ◽  
Point Data ◽  
Physical Profile

With the rapid development of advanced industrial technology and computer technology, using the reverse engineering to mold and simulate for products has already been an important trend in the modern product design, and it has also been an important technology in the CAD/CAM field, especially the field of the molding design. The article took telephone handset as an example, the point cloud data of the physical profile was done by the three-dimensional laser scan using the reverse engineering technology. The handset 3-D mold was given in Pro/E by the point-data processing, the curve and surface constructing. Finally the handset injection mold was designed. The study result shows that using reverse engineering to achieve the design of injection mold can not only effectively reduce the cycle of mold design, but reduce design cost.

scholarly journals Effects of stereoscopic disparity on early ERP components during classification of three-dimensional objects

2018 ◽  
Vol 71 (6) ◽  
pp. 1419-1430 ◽  
Author(s):  
Alan J Pegna ◽  
Alexandra Darque ◽  
Mark V Roberts ◽  
E Charles Leek
Keyword(s):  
Image Classification ◽  
Temporal Dynamics ◽  
Time Window ◽  
Three Dimensional ◽  
Event Related Potential ◽  
Differential Sensitivity ◽  
Object Shape ◽  
3D Object ◽  
3D Shape ◽  
2D And 3D

This study investigates the effects of stereo disparity on the perception of three-dimensional (3D) object shape. We tested the hypothesis that stereo input modulates the brain activity related to perceptual analyses of 3D shape configuration during image classification. High-density (256-channel) electroencephalogram (EEG) was used to record the temporal dynamics of visual shape processing under conditions of two-dimensional (2D) and 3D visual presentation. On each trial, observers made image classification judgements (‘Same’/’Different’) to two briefly presented, multi-part, novel objects. On different-object trials, stimuli could either share volumetric parts but not the global 3D shape configuration and have different parts but the same global 3D shape configuration or differ on both aspects. Analyses using mass univariate contrasts showed that the earliest sensitivity to 2D versus 3D viewing appeared as a negative deflection over posterior locations on the N1 component between 160 and 220 ms post-stimulus onset. Subsequently, event-related potential (ERP) modulations during the N2 time window between 240 and 370 ms were linked to image classification. N2 activity reflected two distinct components – an early N2 (240-290 ms) and a late N2 (290-370 ms) – that showed different patterns of responses to 2D and 3D input and differential sensitivity to 3D object structure. The results revealed that stereo input modulates the neural correlates of 3D object shape. We suggest that this reflects differential perceptual processing of object shape under conditions of stereo or mono input. These findings challenge current theories that attribute no functional role for stereo input during 3D shape perception.

Practical electron tomography

1995 ◽  
Vol 53 ◽  
pp. 742-743
Author(s):  
C.L. Woodcock
Keyword(s):  
Electron Tomography ◽  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
3D Shape ◽  
Computational Resources ◽  
Shape Of Particles

Despite the potential of the technique, electron tomography has yet to be widely used by biologists. This is in part related to the rather daunting list of equipment and expertise that are required. Thanks to continuing advances in theory and instrumentation, tomography is now more feasible for the non-specialist. One barrier that has essentially disappeared is the expense of computational resources. In view of this progress, it is time to give more attention to practical issues that need to be considered when embarking on a tomographic project. The following recommendations and comments are derived from experience gained during two long-term collaborative projects.Tomographic reconstruction results in a three dimensional description of an individual EM specimen, most commonly a section, and is therefore applicable to problems in which ultrastructural details within the thickness of the specimen are obscured in single micrographs. Information that can be recovered using tomography includes the 3D shape of particles, and the arrangement and dispostion of overlapping fibrous and membranous structures.

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