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检索条件"任意字段=Conference on Intelligent Robots and Computer Vision XXIX - Algorithms and Techniques"

共 373 条记录，以下是171-180 订阅

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Interaction of perception and gaze control in autonomous vehicles

Interaction of perception and gaze control in autonomous veh...

引用

conference on intelligent robots and computer vision XX: algorithms, techniques, and Active vision

作者： Pellkofer, M Lützeler, M Dickmanns, ED UBM Inst Systedynam & Flugmechan Munich Germany

ISBN: (纸本)081944300X

For robust and secure behavior in natural environment an autonomous vehicle needs an elaborate vision sensor as main source of information. The vision sensor must be adaptable to the external situation, the mission, the capabilities of the vehicle and the knowledge about the external world accumulated up to the present time. In the EMS-vision system, this vision sensor consists of four cameras with different focal lengths mounted on a highly dynamic pan-tilt camera head. Image processing, gaze control and behavior decision interact with each other in a closed loop. The image processing experts specify so-called regions of attention (RoAs) for each object in 3D object coordinates. These RoAs should be visible with a resolution as required by the measurement techniques applied. The behavior decision module specifies the relevance of obstacles like road segments, crossings or landmarks in the situation context. The gaze control unit takes all this information in order to plan, optimize and perform a sequence of smooth pursuits, interrupted by saccades. The sequence with the best information gain is performed. ne information gain depends on the relevance of objects or object parts, the duration of smooth pursuit maneuvers, the quality of perception and the number of saccades. The functioning of the EMS-vision system is demonstrated in a complex and scalable autonomous mission with the UBM test vehicle VAMORS.

关键词： active vision autonomous vehicles road recognition

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Self-learning, self-broadening knowledge base for calibration-free robot vision

Self-learning, self-broadening knowledge base for calibratio...

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conference on intelligent robots and computer vision XVII - algorithms, techniques, and Active vision

作者： Nguyen, MC Graefe, V Univ Bundeswehr Munchen Inst Messtech D-85577 Neubiberg Germany

ISBN: (纸本)081942983X

A new concept of a self-learning, self-broadening knowledge base that may be used as the long-term memory for a completely calibration-free robot vision to manipulate objects is presented. With this concept the robot automatically acquires during its normal operation the necessary knowledge which can be saved afterwards in the knowledge base and allowing the robot to adapt itself to changing conditions. Thus, the robot presents self-learning characteristics. The robot control using the knowledge base is then based on the human way of solving problems, i.e. new, additional facts (in our case control words) are developed from available facts. Such a control enables improving skills of the robot. The concept has been successfully realized and tested in real-word experiments with an uncalibrated vision-guided manipulator involving the grasping of various objects with nearly any shape and in an arbitrary orientation in horizontal plane.

关键词： self-learning robot calibration-free robot control robot vision machine learning object grasping knowledge based systems

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Motion lecture annotation system to learn Naginata performances

Motion lecture annotation system to learn Naginata performan...

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conference on intelligent robots and computer vision XXXI - algorithms and techniques

作者： Kobayashi, Daisuke Sakamoto, Ryota Nomura, Yoshihiko Mie Univ Grad Sch Engn 1577 Kurima Machiya Tsu Mie Japan Mie Univ Hosp Tsu Mie Japan

ISBN: (纸本)9780819499424

This paper describes a learning assistant system using motion capture data and annotation to teach "Naginata-jutsu" (a skill to practice Japanese halberd) performance. There are some video annotation tools such as YouTube. However these video based tools have only single angle of view. Our approach that uses motion-captured data allows us to view any angle. A lecturer can write annotations related to parts of body. We have made a comparison of effectiveness between the annotation tool of YouTube and the proposed system. The experimental result showed that our system triggered more annotations than the annotation tool of YouTube.

关键词： Sports Instruction Motion Capture Virtual Reality e-Learning Annotation Human computer Interaction

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Research on the Feature Set Construction Method for Spherical Stereo vision 32

引用

conference on intelligent robots and computer vision XXXII - algorithms and techniques

作者： Zhu, Junchao Wan, Li Roning, Juha Feng, Weijia Tianjin Univ Technol Tianjin Key Lab Control Theory & Applicat Complic Tianjin Peoples R China Univ Oulu Dept Comp Sci & Engn Oulu Finland Tianjin Normal Univ Coll Comp & Informat Engn Tianjin Peoples R China

ISBN: (纸本)9781628414967

Spherical stereo vision is a kind of stereo vision system built by fish-eye lenses, which discussing the stereo algorithms conform to the spherical model. Epipolar geometry is the theory which describes the relationship of the two imaging plane in cameras for the stereo vision system based on perspective projection model. However, the epipolar in uncorrected fish-eye image will not be a line but an arc which intersects at the poles. It is polar curve. In this paper, the theory of nonlinear epipolar geometry will be explored and the method of nonlinear epipolar rectification will be proposed to eliminate the vertical parallax between two fish-eye images. Maximally Stable Extremal Region (MSER) utilizes grayscale as independent variables, and uses the local extremum of the area variation as the testing results. It is demonstrated in literatures that MSER is only depending on the gray variations of images, and not relating with local structural characteristics and resolution of image. Here, MSER will be combined with the nonlinear epipolar rectification method proposed in this paper. The intersection of the rectified epipolar and the corresponding MSER region is determined as the feature set of spherical stereo vision. Experiments show that this study achieved the expected results.

关键词： Spherical stereo vision Epipolar geometry Polar curve MSER

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Surface roughness estimation of shot blasted steel bars using machine vision

Surface roughness estimation of shot blasted steel bars usin...

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conference on intelligent robots and computer vision XXII - algorithms, techniques and Active vision

作者： Lydén, S Kälviäinen, H Nykänen, J Lappeenranta Univ Technol Dept Informat Proc FIN-53851 Lappeenranta Finland Imatra Steel Imatra FIN-55100 Imatra Finland

ISBN: (纸本)081945561X

During the manufacturing process steel bars are cleaned of roll scale by shot blasting, before further processing the bars by drawing. The main goal of this project is to increase the automation of the shot blasting process by machine vision. For this purpose a method is needed for estimating the surface roughness and other anomalies from the steel bars from digital images after the shot blasting. The goal of this method is to estimate if the quality of shot blasting is sufficient considering the quality of the final products after the drawing. In this project a method for normalising the images is considered and several methods for estimating the actual roughness level are experimented. During the experiments a best method was one where the roughness levels are calculated directly from the images as if the images were similar to other measuring sources and the grey-level values in the images represent the deviation on the bar surface. This at least separates the different samples.

关键词： shot blasting steel bars surface roughness image processing machine vision differential evolution

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Uniqueness of shape recovery based on interreflections

Uniqueness of shape recovery based on interreflections

引用

conference on intelligent robots and computer vision XV: algorithms, techniques, Active vision, and Materials Handling

作者： Yang, J Zhang, DL Ohnishi, N Sugie, N RIKEN (Japan) Nagoya Univ. (Japan) Meijo Univ. (Japan)

ISBN: (纸本)0819423068

We discuss the uniqueness of 3-D shape recovery of a polyhedron from a single shading image, and propose an approach to uniquely determine the concave shape solution by using interreflections as a constraint. We show that if interreflection distribution is not considered, multiple convex (or concave) shape solutions usually exist for a pyramid with three or more visible facets. However, if interreflection distribution is used as a constraint to limit the shape of polyhedron (for a concave polyhedron), polyhedral shape can be uniquely determined. Interreflections, which were considered to be deleterious in conventional approaches, are an important constraint for shape-from-shading.

关键词： computer vision 3D shape recovery shape-from-shading interreflection polyhedron

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Extraction of shape based properties

Extraction of shape based properties

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conference on intelligent robots and computer vision XVII - algorithms, techniques, and Active vision

作者： Shirkhande, N Cent Michigan Univ Ctr Comp Vis Dept Comp Sci Mt Pleasant MI 48859 USA

ISBN: (纸本)081942983X

A model of an object is an image consisting of features of an object. The input is a gray scale image from which features are computed. In his doctoral thesis, J. L. Chen [6] used a model based approach to object recognition. His method is based on Rosin's work [15] for extraction of parts. Both model and scene features are contour based properties. The scene features are matched to the model features by indexing. The following features are computed: convexity, compactness, roundedness, skewness, and the first moment invariant tall using Rosin's algorithm). In this paper, we extend the feature description to include internal and external parts of an object. We use the interpretation tree approach for matching the scene to model, where constraints such as distances and angles between parts are used to prune the interpretation tree. We compare the efficiency of the interpretation tree approach with the indexing method on the data that was used in previous experiments by J. L. Chen.

关键词： computer vision image processing object recognition

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2D vision in a 3D System

2D vision in a 3D System

引用

conference on intelligent robots and computer vision XX: algorithms, techniques, and Active vision

作者： Flinders, M Intelligent Automat Syst Cambridge MA USA

ISBN: (纸本)081944300X

2D vision in a 3D System will be an overview of important software and mechanical issues related to designing and implementing a system with 3-dimensional characteristics constrained by a 2-dimensional vision system. A general methodology for choosing the right components, including cameras, optics, and lighting will be discussed. Some choices for image processing techniques, related in particular to calibration and pattern-matching approaches, will be overviewed. The discussion will involve approaches to auto-focusing and additional mathematical algorithms that may likely be required. These issues will include world-to-camera transformations and considerations to take when dealing with rotational attributes. The presentation is intended primarily for software engineers and/or other engineers that would be involved in the prototyping, design, and implementation phases of such a project. Typical examples of such systems will be cited and a more in-depth overview of a particular example will be made. Some typical pitfalls, both mechanical and software-related, will also be broached.

关键词： machine vision camera calibration image processing robot image distortion geometric pattern match shadow diffuse light

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EXPERT-SYSTEMS AS DESIGN AIDS FOR ARTIFICIAL vision SYSTEMS - A SURVEY 12

EXPERT-SYSTEMS AS DESIGN AIDS FOR ARTIFICIAL VISION SYSTEMS ...

引用

12th conference on intelligent robots and computer vision: algorithms and techniques

作者： CREVIER, D UNIV QUEBEC ECOLE TECHNOL SUPERDEPT ELECT ENGNMONTREAL H2T 2C8PQCANADA

ISBN: (纸本)0819413208

The development of software that would be to computer vision what expert system shells are to expert systems has been the subject of considerable inquiry over the last ten years; this paper reviews the pertinent publications and tries to present a coherent view of the field. We start by outlining two major differences between would be `vision shells' and conventional expert system shells. The first is the need for an intermediate level of symbolic representation between image pixels and the knowledge base. The second is that the mental operations that people perform to interpret images lie almost totally below the threshold of consciousness. vision system designers therefore cannot, as domain experts normally do, examine their own mental processes and cast them into rules to extract information from images. The vision shell should thus contain, in addition to the usual knowledge engineering toolbox, knowledge on the pertinence of specific imaging operations towards various goals. After a review of the role of explicit knowledge in artificial vision, we examine the architecture a vision shell should have, and look at ways of facilitating the entry of domain-pertinent knowledge into it. Final remarks are made on knowledge representation and acquisition aspects particular to industrial applications.

关键词： Image segmentation Image processing Machine vision computer vision technology Imaging systems Image analysis Visualization Software development Robot vision robots

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Stereo Matching by optimization using weak environmental constraints

Stereo Matching by optimization using weak environmental con...

引用

conference on intelligent robots and computer vision XV: algorithms, techniques, Active vision, and Materials Handling

作者： Branca, A Stella, E Attolico, G Distante, A Istituto Elaborazione Segnali ed Immagini/CNR (Italy)

ISBN: (纸本)0819423068

Oue goal is to mar ch primitives of a pair of images, thereby solving the correspondence problem, in order to estimate depths of 3D scene points from the relative distance (disparity) between matched features. We propose a feature-based approach to solve the correspondence problem by minimizing an appropriate energy function where constraints on radiometric similarity and projective geometric invariance of coplanar points are defined. The method can be seen as a correlation based approach which take into account the projective invariance of coplanar points in computing the optimal matches.

关键词： Detection and tracking algorithms Feature extraction 3D image processing Error analysis Direct methods Image segmentation Object recognition Optimization (mathematics) 3D vision Machine vision

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