检索结果-内蒙古大学图书馆

EARLY ORIENTATION SELECTION—INFERRING TRACE, TANGENT, AND CURVATURE FIELDS

International Journal of Pattern Recognition and Artificial Intelligence 1988年第3期2卷 443-457页

作者： STEVEN W. ZUCKER Canadian Institute for Advanced Research Computer Vision and Robotics Laboratory Department of Electrical Engineering McGill University Montréal Québec Canada

Orientation selection is the inference of orientation information out of images. It is one of the foundations on which other visual structures are built, since it must precede the formation of contours out of pointillist data and surfaces out of surface markings. We take a differential geometric view in defining orientation selection and develop algorithms for actually doing it. The goal of these algorithms is formulated in mathematical terms as the inference of a vector field of tangents (to the contours), and the algorithms are studied in both abstract and computational forms. They are formulated as matching problems, and algorithms for solving them are reduced to biologically plausible terms. We show that two different matching problems are necessary, the first for 1-dimensional contours (which we refer to as Type I processes) and the second for 2-dimensional flows (or Type II processes).

关键词： computer vision Orientation selection Curve detection Relaxation Edge detection Texture

来源：评论

学校读者我要写书评

暂无评论

Recognition of similar objects using tactile image array sensor 6

Recognition of similar objects using tactile image array sen...

引用

Intelligent Robots and computer vision VI 1987

作者： Luo, Ren C. Loh, Horng-Hai Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7911 United States

In this paper, the usefulness of applying the complex as well as ordinary moment features for similar object recognition using a tactile array sensor has been explored. Some complex moment invariants have been derived and implementation of those features has been conducted. With those moment invariants, we can eliminate the effect of lateral displacement and rotation from the tactile images. Through the generation of a decision tree and the utilization of the complex moment features, the shape of the similar objects from the tactile array sensor can be identified. © 1988 SPIE. All rights reserved.

关键词： Object recognition

来源：评论

学校读者我要写书评

暂无评论

Visually guided robotic system for flexible manufacturing automation

Visually guided robotic system for flexible manufacturing au...

引用

1988 International Conference on Industrial Electronics: robotics and vision, IECON 1988

作者： Luo, Ren C. Mullen, Robert E. Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7911 United States

A flexible robotic system with intelligent sensory capability which can be used in an industrial environment to autonomously perform sophisticated manufacturing tasks that are typically done by manual labor is presented. This system can, in many instances, fulfill the same function as the human worker at a faster rate, with higher accuracy/repeatability, and at a reduced cost. The overall system is comprised of two major subsystems: the use of computer vision for object tracking and object identification/manipulation. These subsystems can be described as follows: an optimal tracking subsystem that can visually track and intercept an arbitrary object which is travelling at an unknown velocity on a moving conveyor and the development of a robust visual bar code scanning scheme which can accommodate arbitrary bar code orientations. Thus, the system will provide for the realization of autonomous identification and inspection of arbitrary objects travelling on a conveyor. A Unimate PUMA 560 robot with integrated sensors and a MicroVax II host computer have been employed to evaluate the performance of the presented techniques. The overall system configuration, its basic principles, and a demonstration of the initial results are discussed. © 1988 IEEE.

关键词： Intelligent robots

来源：评论

学校读者我要写书评

暂无评论

Recognition of 3-D objects using modified 3-D general Hough transformation

Recognition of 3-D objects using modified 3-D general Hough ...

引用

1988 International Conference on Industrial Electronics: robotics and vision, IECON 1988

作者： Luo, Ren C. Yang, Woo Suk Kim, Yonghoon Robotics and Intelligence System Laboratory Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7911 United States

The objective of this paper is to develop an innovative 3-D objects recognition algorithm which solves correspondence problem and reduces computational cost for recognition. Correspondency between features of unknown object and its model and complicated computation for recognition seem to be a bottleneck of current 3-D object recognition. Three-dimensional generalized Hough transformation is introduced which can be applied to general 3-D objects, and reduces both the computation time and data base memory requirements. Data base is constructed in off-line fashion based on the view-point independent characteristics from the known 3-D objects using generalized 3-D Hough transformation. In the recognition process, view-. point independent characteristics from unknown objects are obtained and used as a key for searching the data base for the best candidate. To test the algorithm, various types of objects are investigated by use of 3-D range data. © 1988 IEEE.

关键词： Object recognition

来源：评论

学校读者我要写书评

暂无评论

Deriving course 3D models of objects

Deriving course 3D models of objects

引用

Conference on computer vision and Pattern Recognition (CVPR)

作者： F.P. Ferrie M.D. Levine Computer Vision and Robotics Laboratory Department of Electrical Engineering McGill University Montreal QUE Canada

Much of the emphasis in computer vision research has been on recognizing objects. However, in order to perform tasks such as manipulating and avoiding collisions with objects, one needs to consider how to derive appropriate three-dimensional descriptions of objects from available sensor data. A description is given of a computational approach that has been successful in deriving renditions of shaded images in terms of volumetric primitives such as ellipsoids and cylinders.< >

关键词： Ellipsoids computer vision Shape Robot vision systems Laboratories Sensor phenomena and characterization Engine cylinders Robustness Eyes Collision avoidance

来源：评论

学校读者我要写书评

暂无评论

Pattern analysis and texture discrimination in the Gabor space

Pattern analysis and texture discrimination in the Gabor spa...

引用

International Conference on Pattern Recognition

作者： M. Porat Y.Y. Zeevi Vision Research and Computer Vision Laboratory Department of Electrical Engineering Technion-Israel Institute of Technology Haifa Israel

The basic biological principles of nonuniform image representation in the combined frequency-position space are utilized in an approach to image representation and processing. A scheme of image decomposition into optimal localized frequency operators, the so-called Gabor elementary functions which minimize the uncertainty inherent in image representation, is accordingly proposed. Applications to size-invariance and object-separable pattern analysis, localized texture discrimination, and representation by partial information are discussed, illustrating the advantages of the Gabor transform.< >

关键词： Pattern analysis Frequency Space technology Image representation Visual system Image sampling Image processing Shape computer vision Image decomposition

来源：评论

学校读者我要写书评

暂无评论

Wide baseline dynamic stereo: approximation and refinement

Wide baseline dynamic stereo: approximation and refinement

引用

Conference on computer vision and Pattern Recognition (CVPR)

作者： T.E. Weymouth S. Moezzi Computer Vision Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

Stereo algorithms using a wide baseline must cope with a large search space on top of the problems due to noise. A single pair of images is not a reliable source of depth information. One solution is to integrate the information from several image pairs. By incrementally refining estimates of the depth as the camera changes position, it is possible to build a description of the scene which, in turn, can be used as feedback to improve the extraction of depth information. The authors have developed a stereo algorithm based on correlation matching that is especially suited to being integrated into a proposed feedback loop. They have begun experiments with the integration of depth information over a sequence into a single environmental map.< >

关键词： Cameras Stereo vision Layout Data mining Working environment noise Joining processes computer vision Laboratories Feedback loop Noise reduction

来源：评论

学校读者我要写书评

暂无评论

Robotically assisted field material handling using combined visual/acoustic sensing system

Robotically assisted field material handling using combined ...

引用

1988 International Conference on Industrial Electronics: robotics and vision, IECON 1988

作者： Luo, Ren C. Jang, Jong W. Sousk, Steve Keller, Harry Robotics and Intelligence System Laboratory Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7911 United States U. S. Army Belvoir Research Development and Engineering Center United States

A robotically assisted field material handling system designed for loading and unloading of a planar pallet with a forklift in unstructured field environment is'presented The system uses combined acoustic/visual sensing data to define the position/orientation of the pallet and to determine the specific locations of the two slots of the pallet, so that the forklift can move close to the slot and engage it for transport. In order to reduce the complexity of the material handling operation, we have developed a method based on the integration of 2-D range data of Poraloid ultrasonic sensor along with 2-D visual data of an optical camera. Data obtained from the two separate sources complements each other and is used in an efficient algorithm to control this robotically assisted field material handling system. Range data obtained from two linear scannings is used to determine the pan and tilt angles of of a pallet using least mean square method. Then, 2-D visual data is used to determine the swing angle and. © 1988 IEEE.

关键词： Pallets

来源：评论

学校读者我要写书评

暂无评论

Broad area graded barrier quantum well heterostructure lasers by metalorganic chemical vapor deposition for high power applications

Broad area graded barrier quantum well heterostructure laser...

引用

High Power Laser Diodes and Applications 1988

作者： Givens, M.E. Zmudzinski, C.A. Bryan, R.P. Coleman, J.J. Department of Electrical and Computer Engineering Materials Research Laboratory University of Illinois 1406 West Green Streeet UrbanaIL61801 United States

Graded barrier quantum well (GBQW) heterostructure broad area lasers are capable of high power pulsed and cw operation. In this paper, we describe some of the design issues involving broad area graded barrier quantum well heterostructure lasers grown by metalorganic chemical vapor deposition including the effect of junction heating in cw devices and the effect of various buffer layer structures on laser characteristics. We also outline some high power laser diode results for uncoated broad area devices. © 1988 SPIE. All rights reserved.

关键词： Metallorganic chemical vapor deposition

来源：评论

学校读者我要写书评

暂无评论

Robust independent robot joint control: design and experimentation

Robust independent robot joint control: design and experimen...

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： T.C. Hsia T.A. Lasky Z.Y. Guo Robotics Research Laboratory Department of Electrical Engineering and Computer Science University of California Davis CA USA

An approach is presented for the design of simple robust independent joint controllers which result in linear decoupled joint motions. In this approach each joint is treated as a simple inertial systems plus a disturbance torque representing all the unmodeled dynamics. By means of a very simple procedure, the disturbance is instantly estimated and rejected, thus allowing simple PD control to be used. The controllers are inherently robust. Experimental evaluations of the controller on a PUMA 560 are are performed, and the experimental results are presented.< >

关键词： Robust control Robot control Manipulator dynamics Motion control Couplings Torque control Nonlinear dynamical systems Gravity PD control Performance evaluation

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：