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Improved Three-step Phase Shifting Profilometry Using Digital Fringe Pattern Projection

Improved Three-step Phase Shifting Profilometry Using Digita...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Yingsong Hu Jiangtao Xi J. Chicharo Zongkai Yang Department of Electronic and Information Engineering Huazhong University of Science and Technology Wuhan China School of Electrical Computer and Telecommunications Engineering University of Wollongong NSW Australia

In this paper, an improved method for three-step phase shifting profilometry (PSP) is presented to eliminate the errors introduced by the second order harmonic when digital projection are used to generate fringe patterns. Firstly, the error caused by the second order harmonic is theoretically analyzed. Then based on the error analysis and principle of PSP, we propose a novel approach, called improved three-step phase shifting profilometry (I3PSP), to eliminate the influence of the second order harmonic. Finally, simulations are performed to verify the effectiveness of the proposed I3PSP, which demonstrate that the reconstruction accuracy of using three-step PSP has been significantly improved by the proposed I3PSP

关键词： Power harmonic filters Image reconstruction Surface reconstruction Digital filters Band pass filters computer errors Error analysis Gratings Pattern analysis Phase locked loops

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Construction of 3D Composite Objects from Range Data

Construction of 3D Composite Objects from Range Data

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： K. Sato Y. Okada K. Niijima Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka Japan

Recent advances of computer hardware technologies have made it possible to render 3D CG images in real time, and 3D graphics has become in great demand for various applications. However the development of 3D graphics software is still laborious work compared to 2D software development. Hence, the research group of the authors has proposed a component-based 3D graphics software development system called IntelligentBox. However, developers have to construct 3D composite components manually when developing an application even using such a component-based tool, and this is time consuming task. Hence, this paper proposes an automatic construction method of 3D composite objects from range data of artifacts. The 3D object construction system based on this method decomposes a unified surface model obtained from range data of a certain artifact to several elements by segmenting it, automatically exchanges each element into its similar shape model, which is already prepared as a functional component of IntelligentBox, and composes them into one functional composite component which looks like the original artifact. In this way, the user obtains functional composite 3D objects from range data easily

关键词： computer graphics Shape Application software Programming Character generation Intelligent systems Hardware Rendering (computer graphics) Image segmentation computer industry

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Real-Time Tracking with Non-Rigid Geometric Templates Using the GPU

Real-Time Tracking with Non-Rigid Geometric Templates Using ...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： J.F. Ohmer F. Maire R. Brown Queensland University of Technology Brisbane Australia

The tracking of features in real-time video streams forms the integral part of many important applications in human-computer interaction and computer vision. Unfortunately tracking is a computationally intensive task, since the video information used by the tracker is usually prepared by applying a series of image processing filters. Thus it is difficult to realize a real-time tracker using only the CPU of a standard PC. Over the last few years, commodity graphics processing units (GPU) have evolved from fixed graphics pipeline processors into more flexible and powerful data-parallel processors. These stream processors are capable of sustaining computation rates of greater than ten times that of a single CPU. GPUs are inexpensive and are becoming ubiquitous (desktops, laptops, PDAs, cell phones). They are now capable to greatly relieve the CPU especially for large-scale parallel processing tasks, which map well to the architecture of the GPU. In this paper, we present a system, which uses a gradient vector field to track features with flexible geometric templates. Our implementation is specifically designed to suit the parallel processing architecture of the GPU. It is capable to achieve real-time performance with frame rates of around 30 frames per second

关键词： Central Processing Unit Streaming media graphics Parallel processing Application software computer vision Image processing Information filtering Information filters Pipelines

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Optimized NURBS Ship Hull Fitting using Simulated Annealing

Optimized NURBS Ship Hull Fitting using Simulated Annealing

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International conference on computer graphics, imaging and Visualization, CGIV

作者： Ang Swee Wen S. Mariyam Hj. Shamsuddin Y. Samian Department Of Graphics and Multimedia Universiti Teknologi Malaysia Department Of Marine Technology Universiti Teknologi Malaysia Dept. of Graphics & Multimedia Univ. Teknologi

The shape of a NURBS curve or surface is defined by the location of its control points, the control points' weights, and the knot vectors. Most of the curve and surface design tried to modify the control points. However, it is still impossible to obtained accurate control points for a reconstructed NURBS curve or surface. The fitness of these surfaces is generally considered a subjective notion depending on the judgment of the designers (e.g. visually pleasing, devoid of unnecessary bumps or wiggles, satisfying certain continuity requirements). One of the restriction in ship hull design is that the existing details of a ship design on paper or a ship that already been constructed physically couldn 't be reconstructed accurately and concisely in a ship hull design software. This research strives to solve this problem by creating fair ship hull surface using NURBS. An optimized NURBS ship hull fitting approach using simulated annealing is developed. Evaluation and analysis (accuracy, fairness and speed of processing) on the proposed approach is done

关键词： Spline Surface topography Surface reconstruction Marine vehicles Simulated annealing Surface fitting Surface treatment computer graphics Shape control Weight control

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3D Model Generation by Morphing

3D Model Generation by Morphing

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International conference on computer graphics, imaging and Visualization, CGIV

作者： K. Kaneko Y. Okada K. Niijima Graduate School of Information Science and Electrical engineering Kyushu University Fukuoka Japan

This paper proposes a 3D model generation system that outputs intermediate 3D shape models between two already existing 3D models by morphing. Although there have been a lot of computer animation software, it takes a long time to create a 3D shape model even using such computer animation software. Morphing is one of the techniques used to easily create 3D models. If we have two different 3D shape models, it is possible to generate intermediate 3D shape models between them by morphing. However, there are two main problems in the morphing of polygonal models. Those are vertex mismatch and semantic topology mismatch. In this paper, the authors propose an algorithm that is free from the vertex mismatch problem and that automatically determines the semantic topology match. The proposed system based on the algorithm decomposes both two polygonal models, makes decomposed element pairs between them, and then generates intermediate 3D shape models by morphing as for the decomposed element pairs automatically

关键词： Shape Character generation Animation Topology Software computer graphics Information science Electrical engineering Image segmentation Hardware

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Debugging Trellis Decoding of Augmented RAC Array Codes Using a Visual Tool

Debugging Trellis Decoding of Augmented RAC Array Codes Usin...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： L. Kaya M. Al-Qudah Computer Science Department Sharjah University UAE Computer Science Department SZABIST University UAE

Two-dimensional (2D) row and column (RAC) codes are constructed from single parity check (SPC) component codes. Parity check positions of a RAC code can be augmented to improve code rate, resulting augmented RAC (ARAC) code. The augmentation process can be conducted on only row-parity check positions (ARAC-R), or on both row/column positions (ARAC-RC). A visual tool for debugging the process of Viterbi algorithm (VA) decoding of these codes has been designed and implemented. The ARAC code parameters can be selected through a pull-down menu and accordingly a trellis diagram is constructed. Based on the received data, branch-metrics, path-metrics, and surviving path details all can be visually viewed on the trellis diagram. The tool provides an interface for introducing errors at specific array positions and their effect on output sequence can be easily determined

关键词： Debugging Maximum likelihood decoding Parity check codes Block codes Visualization computer science Error correction Viterbi algorithm Algorithm design and analysis Lattices

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Gridding Multivariate Positive Data for Real Time Visualization

Gridding Multivariate Positive Data for Real Time Visualizat...

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International conference on computer graphics, imaging and Visualization, CGIV

作者： G. Mustafa Abad Ali Shah M.R. Asim Department of Computer Science & Engineering UET Lahore Pakistan R &D center of computer science UET Lahore Pakistan COMSATS Institute of IT Lahore Pakistan

Common visualization methods require an underlying grid. For visualization of scattered data samples it is required to approximate the data at the same grid using some interpolation technique. It is common that the data samples are positive and representing the quantities for which negative value is meaningless. For example mass, volume and density are meaningless when negative. Modified quadratic Shepard method is a commonly used method for gridding purposes. However it does not preserve positivity for inherently positive data sets. This paper discusses the problem of gridding inherently positive data sets for real time visualization applications using modified quadratic Shepard's method. Key requirement for an algorithm to be used for real time application is its predictable timing behavior. We present an efficient and deterministic alternative quadratic Shepard method as a solution to the problem of visualization of multivariate positive data in real time

关键词： Data visualization Interpolation Timing Radar scattering computer science Application software Economic forecasting Geophysics Astronomy Meteorology

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A Visualization Model for Web Sitemaps

A Visualization Model for Web Sitemaps

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International conference on computer graphics, imaging and Visualization, CGIV

作者： Quang Vinh Nguyen Mao Lin Huang Kang Zhang I-Ling Yen Faculty of Information Technology University of Technology Sydney Australia Department of Computer Science University of Technology Dallas TX USA

ISBN: (纸本)0769526063;9780769526065

This paper describes a space-efficient visualization model that automatically crawls through a Web site and visualizes its sitemap. This model can be used especially for displaying and navigating a very large Web site in a two-dimensional (2D) plane and/or a three-dimensional (3D) space. The 2D visualization employs EncCon layout algorithm to effectively visualize a very large number of pages and relations at once in which it utilizes the space to display more information. This technique also employs a focus+context navigation method to enable the exploration of large sites. Animation is provided to preserve the user's mental map while exploring the Web site hierarchy. The 3D visualization extends the 2D EncCon layout algorithm to a three-dimensional space which aims to provide a more realistic look and feel of the information

关键词： Visualization Navigation Two dimensional displays Internet Three dimensional displays Power system modeling Information technology Space technology computer science Animation

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Usability Evaluation of a Mixed Reality Collaborative Tool for Design Review

Usability Evaluation of a Mixed Reality Collaborative Tool f...

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International conference on computer graphics, imaging and Visualization, CGIV

作者： Xiangyu Wang P.S. Dunston Key Center of Design Computing and Cognition School of Architecture Design Science and Planning University of Sydney Sydney NSW Australia School of Civil Engrg Purdue University West Lafayette IN USA

Formal usability evaluation of mixed reality (MR) environments to date has received very little attention in MR literature and research. While awareness of the need for usability evaluation of MR appears to be on the rise, the techniques needed to perform efficient, meaningful usability evaluation of these environments are not yet available. This paper presents how the usability of MR system interfaces could be evaluated by using a combination of heuristic evaluation and formative user testing. This paper demonstrates by applying in assessing an MR-based collaborative virtual environment prototype for mechanical design review - mixed reality-based collaborative virtual environment (MRCVE). The evaluation was implemented through a devised experiment where human subjects were invited to use the MRCVE system for identifying design errors collaboratively from virtual mechanical models. Usability suggestions were also identified for the interface of future versions of MRCVE

关键词： Usability Virtual reality Collaborative tools Collaboration Virtual environment Virtual prototyping Performance evaluation Collaborative work Cognition computer architecture

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Visual Registration of Industrial Metallic Object from Local Contour Descriptors

Visual Registration of Industrial Metallic Object from Local...

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International conference on computer graphics, imaging and Visualization, CGIV

作者： S. Bourgeois S. Naudet-Collette M. Dhome CEA Saclay DRT/LIST/DTSI/SARC/LCEI France LASMEA-CNRS UMR 6602 Blaise Pascal University Clermont-Ferrand II France

This article introduces an innovative visual registration process suitable for textureless objects. Because our framework is industrial, the process is designed for metallic, complex free-form objects containing multiple bores. This technique is based on a new contour descriptor, invariant under affine transformation, which characterizes the neighborhood of a closed contour. The affine invariance is exploited in the learning stage to produce a lightweight model. Moreover, during the learning stage, this descriptor is combined to a 2D/3D pattern, concept likewise presented in this article. Once associated, the 2D/3D information wealth of this descriptor allows a pose estimation from a single match. This ability is exploited in the registration process to drastically reduce the complexity of the algorithm and increase efficiently its robustness to the difficult problem of repetitive patterns. Evaluations on a cylinder head, a car door and a binding beam confirm both the robustness and the precision of the process

关键词： Metals industry Robustness Shape Boring Head computer vision Robot vision systems Robot control Optical reflection Pattern matching

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