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检索条件"任意字段=Intelligent Robots and Computer Vision XXV: Algorithms, Techniques, and Active Vision"

共 724 条记录，以下是581-590 订阅

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UNCONSTRAINED SHAPE FROM SHADING 12

UNCONSTRAINED SHAPE FROM SHADING

引用

12TH CONF ON intelligent robots AND computer vision : active vision AND 3D METHODS

作者： LEE, KM KUO, CCJ Univ. of Southern California (United States)

ISBN: (纸本)0819413216

Most conventional SFS (shape from shading) algorithms have been developed under three basic assumptions about surface properties and imaging geometry to simplify the problem. They are the Lambertian surface property, the orthographic projection, and the distant single light source. However, since these assumptions are not appropriate for many real applications, apparent distortions of reconstructed surfaces occur with conventional SFS algorithms. To obtain a more practically useful and accurate SFS algorithm, it is necessary to relax these restrictive assumptions and adopt more general conditions or models about the imaging process. In this research, we propose a new direct shape recovery algorithm from one or multiple shaded images generated by a general reflectance model which includes diffuse and specular effects, perspective projection, and a nearby point light source. The basic idea of our approach is to use a finite triangular surface model and express the image irradiance in terms of surface nodal depth variables through a linearized reflectance map under the perspective projection model. The object shape is recovered by determining all nodal depth variable through a cost minimization process.

关键词： Reflectivity Light sources computer vision technology Machine vision Image processing Robot vision robots Algorithm development Image acquisition Reconstruction algorithms

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PROGRESS IN HIGH-LEVEL EXPLORATORY vision 12

PROGRESS IN HIGH-LEVEL EXPLORATORY VISION

引用

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

作者： BRAND, M NORTHWESTERN UNIV INST LEARNING SCIEVANSTONIL 60201

ISBN: (纸本)0819413208

We have been exploring the hypothesis that vision is an explanatory process, in which causal and functional reasoning about potential motion plays an intimate role in mediating the activity of low-level visual processes. In particular, we have explored two of the consequences of this view for the construction of purposeful vision systems: Causal and design knowledge can be used to (1) drive focus of attention, and (2) choose between ambiguous image interpretations. An important result of visual understanding is an explanation of the scene's causal structure: How action is originated, constrained, and prevented, and what will happen in the immediate future. In everyday visual experience, most action takes the form of motion, and most causal analysis takes the form of dynamical analysis. This is even true of static scenes, where much of a scene's interest lies in how possible motions are arrested. This paper describes our progress in developing domain theories and visual processes for the understanding of various kinds of structured scenes, including structures built out of children's constructive toys and simple mechanical devices.

关键词： Visualization Visual analytics Buildings robots computer vision technology Machine vision Motion analysis Pathology Robot vision Visual process modeling

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intelligent robot control using omnidirectional vision

Intelligent robot control using omnidirectional vision

引用

intelligent robots and computer vision XI: algorithms, techniques, and active vision

作者： Ghayalod, Manoj Hall, Ernest L. Univ. of Cincinnati Cincinnati OH USA

ISBN: (纸本)0819410268

Omnidirectional vision using a wide angle lens with a 2 pi steradian field has been studied for image visualization and navigation for mobile robots. The advantages that can be obtained with the large field of view include instantaneous viewing which permits dynamic control and improved visualization. The significant geometric distortion can be corrected using image processing for either image viewing or target recognition. The purpose of this paper is to present results from the use of omnidirectional vision as an integral component in an intelligent robot control system. Using the vision system for position updates provides a method for accurate position control. Simulation and experimental results are presented of a two level control system which uses encoders for dead reckoning position control and periodic vision position updates. The system appears promising for mobile robot navigation and can lead to a robust control system.

关键词： intelligent robots

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AN IMPROVING VISIBILITY METHOD FOR UNDERWATER robots 12

AN IMPROVING VISIBILITY METHOD FOR UNDERWATER ROBOTS

引用

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

作者： LIU, SQ XIA, YX FENGPING, JB WAWG, TL GONG, ZB ACAD SINICA ANHUI INST OPT & FINE MECHHEFEI 230031PEOPLES R CHINA

ISBN: (纸本)0819413208

Fov improving underwater visibility for robots. a method using special intervallic series of light pulses, and two acts of emitting and receiving are performed by two special designed optical shutters and the control signals are synchronized delayed is presented. Calculations show that the received backscattering light can be reduced and so the visible distance increased . This method has several advantages which can make it practical for underwater robots and other actual use. Its feasibility has been demonstrated in the experiments. while only in principle as the limitation of the experimental conditions at present. © 1993 SPIE.

关键词： Underwater visibility

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ESTABLISHING IDENTITY AND POSE OF OBJECTS FROM A LIBRARY USING RECIPROCAL BASIS-SET AND DIRECTION-OF-ARRIVAL techniques 12

ESTABLISHING IDENTITY AND POSE OF OBJECTS FROM A LIBRARY USI...

引用

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

作者： WRIGHT, CR VAZ, RF CYGANSKI, D WORCESTER POLYTECH INST DEPT ELECT & COMP ENGNMACHINE VIS LABWORCESTERMA 01609

ISBN: (纸本)0819413208

In many object recognition problems, the object to be identified is one of a fixed set (library) of objects. The problem of identifying which object is present then shares characteristics of the signal detection and parameter estimation problem: which signal is present and what are its parameters? The Reciprocal Basis Set/Direction of Arrival (RBS/DOA) technique is a recently developed technique for object pose determination. It uses a single, comprehensive analytic object model representing a suite of views of an object. Object orientation can be directly established from single 2-D views of the object, without a costly search of the pose parameter space, and without need for the views to be related by a geometric image transformation. This paper describes how one can construct reciprocal basis sets to simultaneously determine object identity and pose from a single 2-D image. Results are presented which demonstrate this ability for a single unknown pose parameter using synthetic and camera-acquired images.

关键词： Visual process modeling Machine vision computer vision technology Robot vision robots Wavefronts Error analysis Image processing Object recognition Signal detection

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WAVELET TRANSFORM IN-DEPTH RECOVERY 12

WAVELET TRANSFORM IN-DEPTH RECOVERY

引用

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

作者： HOR, MK CHEN, JYM CHEN, KS ACAD SINICA INST INFORMAT SCITAIPEI 115TAIWAN

ISBN: (纸本)0819413208

In this paper, a number of spatial/spatial-frequency image representations are reviewed. Wavelets have recently generated much interest, both in applied areas as well as in more theoretical ones. Wavelet transform relative to some basic wavelets provides a flexible time- frequency window which automatically narrows when observing high frequency phenomena and widens when studying low frequency environments. As a result, it is suitable for visual information representation. Applications in computer vision such as image compression and image enhancement are examined. method is presented, in which, a N X N subimage is divided into a lot of N X 7 or N X 9 narrow image regions perpendicular to local fringe direction, and then each region is segmented by a corresponding threshold curve. Because the threshold curves can follow fringe's extremum changes, it can avoid the effect of the inhomogeneous grey level distribution caused by diffraction halo and accurate segmen space, a projection operator is used in the spatial-variant deconvolution. Nevertheless, experimental results show that this approximation mechanism can generate the depth map of different images successfully.

关键词： Wavelets Wavelet transforms Cameras computer vision technology Machine vision Image processing Robot vision robots Deconvolution Space operations

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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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IMAGE-CODING AND IMAGE ACTIVITY MEASUREMENT 12

IMAGE-CODING AND IMAGE ACTIVITY MEASUREMENT

引用

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

作者： KEISSARIAN, F IBRAHIM, MK DAEMI, MF UNIV NOTTINGHAM DEPT COMP SCIRECOGNIT ENGN GRPNOTTINGHAM NG7 2RDENGLAND

ISBN: (纸本)0819413208

In this paper, a novel image analysis technique is proposed, which may be performed prior to coding in order to decide what is the most significant information to encode. In the proposed system, the image to be coded is first partitioned into a large number of sub-blocks of N*N pixels. The blocks can then be stored into two major classes according to the level of the visual activity present. The classification is based on analyzing the local histogram within each sub-block. In this paper, we initially analyze the image blocks to separate uniform blocks from those that can be classified as non-uniform blocks. Adjacent uniform blocks with the same statistics are merged to form large blocks. These blocks can then be coded by their mean values. It is also shown that the non-uniform blocks may also be classified into three categories with different levels of activity.

关键词： Image compression Image quality Image analysis computer vision technology Machine vision Robot vision robots Image processing Statistical analysis Image transmission

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ROBUST DEPTH EXTRACTION FOR MOBILE robots 12

ROBUST DEPTH EXTRACTION FOR MOBILE ROBOTS

引用

12TH CONF ON intelligent robots AND computer vision : active vision AND 3D METHODS

作者： NAGLE, MG SRINIVASAN, MV SOBEY, PJ Australian National Univ. (Australia)

ISBN: (纸本)0819413216

Stereoscopic techniques for recovering depth in scenes are computationally intensive and difficult to specify sufficiently well to ensure that optimal solutions are obtained in any given situation. Apparent motion cues are a far richer and more easily exploitable source of information on depth, but computing depth from motion in spatio-temporal image sequences has many pit-falls associated with it. We show that many of these can be avoided by simultaneous capture of two or more views of the scene, projected onto a single CCD sensor, using angled mirrors. The resulting fixed-camera ranging device is immune to camera vibration and motion as well as to changes in ambient illumination that occur during image capture. A 1-D, generalized gradient scheme is used to compute the apparent image motion induced by objects in the scene and hence the range to the corresponding objects. Furthermore, the fixed camera configuration enables the shape and size of the viewing filter to be preselected to optimize performance and maximize range resolution.

关键词： Cameras robots Optical filters Spatial filters Image filtering Motion measurement computer vision technology Machine vision Robot vision CCD image sensors

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LONG SEQUENCE-ANALYSIS OF HUMAN MOTION USING EIGENVECTOR DECOMPOSITION 12

LONG SEQUENCE-ANALYSIS OF HUMAN MOTION USING EIGENVECTOR DEC...

引用

12TH CONF ON intelligent robots AND computer vision : active vision AND 3D METHODS

作者： MURPHY, N BYRNE, N OLEARY, K Dublin City Univ. (Ireland)

ISBN: (纸本)0819413216

The work described in this paper takes place in the context of an attempt to develop a clearer understanding of what is meant by task oriented visual processing. The traditional separation of task and sensory processing within computer vision is something which has lead to an overemphasis on representation, modularity, and the single functionality of artificial vision systems. These issues are briefly discussed here in the context that the Karhunen Loeve Transform (KLT) is an algorithmic approach which allows us to begin to move away from a preconceived view of what vision is, how it works, and what it does. We summarize the mathematical background and basic operation of the KL coding procedure. We examine the application of the eigenvector decomposition to the analysis of human motion over several posture cycles of a walking sequence. The approach is used to examine the potential for recognition through motion, for posture description and for natural motion reconstruction processes. Various classification and analysis techniques, including artificial neural networks, the Fourier transform, and heuristic operations are used to extract the information available about the different cues investigated.

关键词： Machine vision computer vision technology Visualization Motion analysis Image processing Information visualization Robot vision robots Video Statistical analysis

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