检索结果-内蒙古大学图书馆

Towards a general multi-view registration technique

IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE 1996年第5期18卷 540-547页

作者： Bergevin, R Soucy, M Gagnon, H Laurendeau, D Computer Vision and Systems Laboratory Department of Electrical and Computer Engineering Laval University QUE Canada

We present an algorithm that reduces significantly the level of the registration errors between all pairs in a set of range views. This algorithm refines initial estimates of the transformation matrices obtained from either the calibrated acquisition setup or a crude manual alignment. It is an instance of a category of registration algorithms known as iterated closest-point (ICP) algorithms. The algorithm considers the network of views as a whole and minimizes the registration errors of all views simultaneously. This leads to a well-balanced network of views in which the registration errors are equally distributed, an objective not met by previously published ICP algorithms which all process the views sequentially. Experimental results show that this refinement technique improves the calibrated registrations and the quality of the integrated model for complex multipart objects. In the case of scenes comprising man-made objects of very simple shapes, the basic algorithm faces problems common to all ICP algorithms and must thus be extended.

关键词： multiple view registration model building three-dimensional objects range images surface modeling multiple view integration

来源：评论

学校读者我要写书评

暂无评论

Designing stereo heads using task domain constraints

Designing stereo heads using task domain constraints

引用

13th International Conference on Pattern Recognition, ICPR 1996

作者： Thayer, Scott M. Gourley, Christopher S. Electrical and Computer Engineering Department Computer Vision and Robotics Research Laboratory University of Tennessee Knoxville TN 37996-2100 United States

ISBN: (纸本)081867282X

A novel paradigm for the synthesis of convergent-axis stereo geometries is presented. This paradigm incorporates constraints that represent task-oriented properties that can be easily derived in many applications of stereo-ranging, particularly those involving manipulation. Given these properties, a solution that selects the set of optimal design parameters, in the sense of accuracy, under the given constraints is presented. Results of this algorithm are discussed and analyzed in terms of the optimality of the minimum-area technique used in the derivation. © 1996 IEEE.

关键词： Pattern recognition

来源：评论

学校读者我要写书评

暂无评论

Modeling structured environments using robot vision 2nd

Modeling structured environments using robot vision

引用

2nd Asian Conference on computer vision, ACCV 1995

作者： Shah, Shishir Aggarwal, J.K. Computer and Vision Research Center Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712-1084 United States

ISBN: (纸本)9783540607939

In this paper, we review the various methods for robust autonomous mobile robot navigation and scene modeling in structured environments. The techniques vary with availibility of a priori knowledge of the environment and the number of sensors with which the robot is equipped. The methods may be broadly classified into three categories: model based approaches, landmark based methods, and methods using information provided by the robot trajectory and its integration with sensor information for navigation and estimation of three dimensional (3D) position in the environment. Also, we describe the mobile robot ROBO-TEX, an autonomous mobile robot constructed in our laboratory. A successful implementation for constructing computer aided design (CAD) models of a structured scene as imaged by a single wide angle lens CCD camera while navigating is considered and evaluated. Finally, we discuss another navigation system that uses a stereo pair of fish-eye lenses, and discuss the merits of such a system over some of the other implementations for navigation and modeling of the scene. © Springer-Verlag Berlin Heidelberg 1996.

关键词： CCD cameras

来源：评论

学校读者我要写书评

暂无评论

Designing stereo heads using task domain constraints

Designing stereo heads using task domain constraints

引用

International Conference on Pattern Recognition

作者： S.M. Thayer C.S. Gourley Electrical and Compute Engineering Department Computer Vision and Robotics Research Laboratory University of Tennessee Knoxville TN USA

关键词： Cameras Stereo vision Solid modeling computer vision Laboratories Lenses Equations Robot vision systems Computational geometry Contracts

来源：评论

学校读者我要写书评

暂无评论

A back-propagation neural network model for prediction of loss of balance

A back-propagation neural network model for prediction of lo...

引用

Southern Biomedical engineering Conference

作者： Wenjian Wang A. Bhattacharya Department of Electrical & Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA Biomechanics & Ergonomics Research Laboratory Department of Environmental Health University of Cincinnati Cincinnati OH USA

Two neural network models were developed for the prediction of postural sway response due to exposure to risk factors including environmental lighting, job-tasks, standing surface firmness, surface oiliness, work load, peripheral vision conditions, age and gender. Variables used to measure the loss of balance were index of proximity to stability boundary and sway length. Tests showed that job-task is the main risk factor that changes the output while there is some impact by age or gender on the outcome of the model. The results from these models can be used to find risk factors that have great impact on loss of balance and therefore can help in designing intervention programs.

关键词： Neural networks Predictive models Artificial neural networks Stability computer networks Biomechanics Muscles computer peripherals computer vision computer science

来源：评论

学校读者我要写书评

暂无评论

Multi-stage target recognition using modular vector quantizers and multilayer perceptrons

Multi-stage target recognition using modular vector quantize...

引用

Conference on computer vision and Pattern Recognition (CVPR)

作者： L.A. Chan N.M. Nasrabadi V. Mirelli Department of Electrical and Computer Engineering State University of New York University at Buffalo Buffalo NY USA US Army Research Laboratory Fort Belvoir VA USA

An automatic target recognition (ATR) classifier is proposed that uses modularly cascaded vector quantizers (VQs) and multilayer perceptrons (MLPs). A dedicated VQ codebook is constructed for each target class at a specific range of aspects, which is trained with the K-means algorithm and a modified learning vector quantization (LVQ) algorithm. Each final codebook is expected to give the lowest mean squared error (MSE) for its correct target class at a given range of aspects. These MSEs are then processed by an array of window MLPs and a target MLP consecutively. In the spatial domain, target recognition rates of 90.3 and 65.3 percent are achieved for moderately and highly cluttered test sets, respectively. Using the wavelet decomposition with an adaptive and independent codebook per sub-band, the VQs alone have produced recognition rates of 98.7 and 69.0 percent on more challenging training and test sets, respectively.

关键词： Target recognition Multilayer perceptrons Vector quantization Books Pixel Error correction codes Automatic testing System testing Area measurement

来源：评论

学校读者我要写书评

暂无评论

Visibility analysis on a massively data-parallel computer

引用

Concurrency and Computation: Practice and Experience 1996年第6期8卷

作者： Daniel Germain Denis Laurendeau Guy Vézina Computer Vision and Systems Laboratory Electrical Engineering Department Université Laval Ste-Foy Québec Canada G1K 7P4 Command and Control and Information Sytems Division Defence Research Establishment Valcartier PO Box 8800 Courcelette Québec Canada G0A 1R0

Visibility analysis algorithms use digital elevation models (DEMs), which represent terrain topography, to determine visibility at each point on the terrain from a given location in space. This analysis can be computationally very demanding, particularly when manipulating high resolution DEMs accurately at interactive response rates. Massively data-parallel computers offer high computing capabilities and are very well-suited to handling and processing large regular spatial data structures. In the paper, the authors present a new scanline-based data-parallel algorithm for visibility analysis. Results from an implementation onto a MasPar massively data-parallel SIMD computer are also presented.

关键词：

来源：评论

学校读者我要写书评

暂无评论

EXPERIMENTS IN ACTIVE vision WITH REAL AND VIRTUAL ROBOT HEADS

引用

APPLIED INTELLIGENCE 1995年第3期5卷 237-250页

作者： MARAPANE, SB TRIVEDI, MM Computer Vision and Robotics Research Laboratory Electrical and Computer Engineering Department The University of Tennessee 37996-2100 Knoxville TN

In the emerging paradigm of animate vision, the visual processes are not thought of as being independent of cognitive or motor processing, but as an integrated system within the context of visual behavior. Intimate coupling of sensory and motor systems have found to improve significantly the performance of behavior based vision systems. In order to study active vision systems one requires sensory-motor systems. Designing, building, and operating such a test bed is a challenging task. In this paper we describe the status of on-going work in developing a sensory-motor robotic system, R2H, with ten degrees of freedoms (DOF) for research in active vision. To complement the R2H system a Graphical Simulation and Animation (GSA) environment is also developed. The objective of building the GSA system is to create a comprehensive design tool to design and study the behavior of active systems and their interactions with the environment. GSA system aids the researchers to develop high performance and reliable software and hardware in a most effective manner. The GSA environment integrates sensing and motor actions and features complete kinematic simulation of the R2H system, it's sensors and it's workspace. With the aid of the GSA environment a Depth from Focus (DFF), Depth from Vergence, and Depth from Stereo modules are implemented and tested. The power and usefulness of the GSA system as a research tool is demonstrated by acquiring and analyzing images in the real and virtual worlds using the same software implemented and tested in the virtual world.

关键词： ACTIVE vision ROBOT HEADS ROBOT SIMULATION DEPTH EXTRACTION

来源：评论

学校读者我要写书评

暂无评论

RESIDUAL UNCERTAINTY IN 3-DIMENSIONAL RECONSTRUCTION USING 2-PLANES CALIBRATION AND STEREO METHODS

引用

PATTERN RECOGNITION 1995年第7期28卷 1073-1082页

作者： THAYER, S TRIVEDI, M Electrical and Computer Engineering Department Computer Vision and Robotics Research Laboratory The University of Tennessee Knoxville TN 37996-2100 U.S.A.

A necessary goal in the calibration of any instrument is an indication of how well the particular device performs. In the specific case where a camera system is used in the process of three-dimensional reconstruction or stereopsis, geometric measures of the accuracy, precision, and repeatability of 3-D point measurements give a quantitative evaluation of the success of that algorithm. This paper presents an experimental performance analysis of a traditional calibration algorithm as applied to the problem of three-dimensional vision. The study begins with an analysis of the algorithm in a single camera or monocular system. Monocular analysis concludes with a derivation of error boundaries under different. geometric constraints. Showing how this residual error propagates from the component monocular systems into a three-dimensional reconstruction, a binocular analysis derives the desired performance monitors. The paper concludes with a geometric interpretation of the results.

关键词： STEREOPSIS ACCURACY PRECISION REPEATABILITY MONOCULAR BINOCULAR 2-PLANES CALIBRATION

来源：评论

学校读者我要写书评

暂无评论

ROBOT PERFORMANCE-MEASUREMENT AND CALIBRATION USING A 3D computer vision SYSTEM

引用

ROBOTICA 1995年第4期13卷 327-337页

作者： PREISING, B HSIA, TC Robotics Research Laboratory Department of Electrical and Computer Engineering University of California Davis Davis California 95616 (USA)

Present day robot systems are manufactured to perform within industry accepted tolerances. However, to use such systems for tasks requiring high precision, various methods of robot calibration are generally required. These procedures can improve the accuracy of a robot within a small volume of the robot's workspace. The objective of this paper is to demonstrate the use of a single camera 3D computer vision system as a position sensor in order to perform robot calibration. A vision feedback scheme, termed vision-guided Robot Control (VRC), is described which can improve the accuracy of a robot in an on-line iterative manner. This system demonstrates the advantage that can be achieved by a Cartesian space robot control scheme when end effector position/orientation are actually sensed instead of calculated from the kinematic equations. The degree of accuracy is determined by setting a tolerance level for each of the six robot Cartesian space coordinates. In general, a small tolerance level requires a large number of iterations in order to position the end effector, and a large tolerance level requires fewer iterations. The viability of using a vision system for robot calibration is demonstrated by experimentally showing that the accuracy of a robot can be drastically improved. In addition, the vision system can also be used to determine the repeatability and accuracy of a robot in a simple, efficient, and quick manner. Experimental work with an IBM Electric Drive Robot (EDR) and the proposed vision system produced a 97 and a 145 fold improvement in the position and orientation accuracy of the robot, respectively.

关键词： 3D vision ROBOT PERFORMANCE CALIBRATION POSITION SENSOR

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：