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检索条件"任意字段=Intelligent Robots and Computer Vision X: Neural, Biological, and 3-D Methods 1991"

共 118 条记录，以下是31-40 订阅

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determining Gabor-filter parameters for texture segmentation

Determining Gabor-filter parameters for texture segmentation

引用

intelligent robots and computer vision xI: biological, neural Net, and 3-d methods

作者： dunn, dennis F. Higgins, William E. Wakeley, Joseph The Pennsylvania State Univ. State Coll. PA USA

ISBN: (纸本)0819410276

The ability to segment a textured image into separate regions (texture segmentation) continues to be a challenging problem in computer vision. Many texture-segmentation schemes are based on a filter-bank model, where the filters (henceforth referred to as Gabor Filters) are derived from Gabor elementary functions. The goal of these methods is to transform texture differences into detectable filter-output discontinuities at texture boundaries. Then, one can segment the image into differently textured regions. distinct discontinuities occur, however, only if the parameters defining the Gabor filters are suitably chosen. Some previous analysis has shown how to design appropriate filters for discriminating simple textures. designing filters for more general textures, though, has largely been done ad hoc. We have devised a new, more effective, more rigorously based method for determining Gabor-filter parameters. The method is based on an exhaustive, but efficient, search of Gabor-filter parameter space and on a detection-theory formulation of a Gabor filter's output. We provide qualitative arguments and experimental results indicating that our new method is more effective than other methods in producing suitable filter parameters. We demonstrate that our model also gives good filter designs for a variety of texture types.

关键词： computer vision

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Application of fuzzy logic in robot control

Application of fuzzy logic in robot control

引用

intelligent robots and computer vision xI: biological, neural Net, and 3-d methods

作者： Kemppainen, Seppo Roning, Juha J. Univ. of Oulu Oulu 57 Finland

ISBN: (纸本)0819410276

during the past several years, fuzzy control has emerged as a suitable control strategy for many complex and nonlinear control problems. The control provided by fuzzy logic is both smooth and accurate. Also the 'if-then' rules of fuzzy control systems are easy to understand and relatively easy to develop. This paper presents a toolkit which is used in the implementation of fuzzy control system. The toolkit consists of C++ class library which computes inferences in fuzzy logic. The toolkit is used to implement a fuzzy control system which controls the movement of a simulated mobile robot. The proposed architecture consists of several rulesets. Each ruleset specializes in some control task, for example, there are rulesets for going around an obstacle, avoiding a moving obstacle, going through a door, etc. The multiple ruleset fuzzy control system is used to guide the simulated mobile robot to a given goal in an unknown environment. With the proposed multiple ruleset architecture complex control problems can be solved while single rulesets remain simple and efficient.

关键词： Mobile robots

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Generalized bidirectional associative memories for image processing

Generalized bidirectional associative memories for image pro...

引用

intelligent robots and computer vision xI: biological, neural Net, and 3-d methods

作者： Kulkarni, Arun d. Yazdapanhi, Iraj Univ. of Texas/Tyler Tyler TX USA

ISBN: (纸本)0819410276

The bidirectional associative memory (BAM) so far is limited to two input/output patterns. Recently, Humpert has suggested the generalization of the BAM to a bidirectional associative memory with several input/output patterns (BAMg). The generalization of the BAM to the BAMg raises several interesting questions regarding the inter-connections and updating of neuron fields. Some of the possible configurations of the BAMg are investigated in the paper. The BAMg is very useful in many image processing applications where-in storage and retrieval of sets of images is required. Each set may contain two or more images. In this paper, we have developed a software simulation for the BAMg, and have used the BAM g to store and retrieve three sets of images. Each set consists of three images. during the retrieval partial or noisy images are used as the stimulus vectors to retrieve corresponding images in other sets. The results are presented in the paper.

关键词： Associative storage

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Phase method for binocular vergence control and depth reconstruction

Phase method for binocular vergence control and depth recons...

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intelligent robots and computer vision xI: biological, neural Net, and 3-d methods

作者： Theimer, Wolfgang M. Mallot, Hanspeter A. Toelg, Sebastian Ruhr Univ. Bochum Ger

ISBN: (纸本)0819410276

We present a technique to guide vergence movements for an active stereo camera system and to construct dense disparity maps. Both processes are described in the same theoretical framework based on phase differences in complex Gabor filter responses, modelling receptive field properties in the visual cortex. While the camera movements are computed with coarse spatial resolution input images, disparity calculation uses finer resolutions in a scale space. The correspondence problem is solved implicitly by restricting the disparity range around zero disparity to the filter kernel sizes (Panum's area in the human visual system). The method contrasts to matching algorithms - that require an explicit search for correspondence - and to correlation, needing a maximum detection in the correlation function. The vergence process is interpreted as a mechanism to minimize global disparity, thereby setting a 3d region of interest for subsequent disparity detection. This mall volume is centered around the fixation point where both optical axes intersect. Additionally it produces a scalar distance measure via vergence angles and camera base. The disparity map represents smaller local disparities as an important cue for depth perception. The vergence control works in a real-time feedback loop. Quantitative results are presented.

关键词： computer vision

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Adaptive time-delay neural network for temporal correlation and prediction

Adaptive time-delay neural network for temporal correlation ...

引用

intelligent robots and computer vision xI: biological, neural Net, and 3-d methods

作者： Lin, d.-T. dayhoff, Judith E. Ligomenides, Panos A. Univ. of Maryland/Coll. Park Coll. Park MD USA

ISBN: (纸本)0819410276

dynamic identification of temporally changing signals is a key issue in real-time signal processing and understanding. Such changing signals may arise from moving objects in visual images, spoken words, target trajectories and other kinds of sensor data in a wide variety of applications. An Adaptive Time-delay neural Network (ATNN) is proposed, which dynamically adapts its time-delays as well as its synaptic weights. The resulting network is trained to distinguish the temporal properties and spatiotemporal correlations of various input patterns. In biological systems, the delays along axons or at the synapses may vary, like in the ATNN, due to factors such as the length of the axon, insulation (myelin), or the details of the biochemical processes. In this paper, an improved learning algorithm based on gradient descent is derived, both for adaptive time-delays and synaptic strengths. This adaptation paradigm offers more flexibility for the network to attain the optimal time-delays and to achieve more accurate pattern mapping and classification than is the case of using arbitrary fixed delays, as has been done previously. Noise tolerance was tested on a series of experiments, and it is found that the proposed ATNN shows advantages. Time series prediction was tested with the chaotic Mackey-Glass equation, and the ATNN performed better than training with fixed time delays. The ATNN is suitable for spatiotemporal signal recognition, prediction and classification.

关键词： neural networks

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Two-image photometric stereo method

Two-image photometric stereo method

引用

intelligent robots and computer vision xI: biological, neural Net, and 3-d methods

作者： Yang, Jun Ohnishi, Noboru Sugie, Noboru Nagoya Univ. Furo-Cho Chikusa-Ku Nagoya Japan

ISBN: (纸本)0819410276

In the photometric stereo method, the surface orientation of an object is determined by using multiple images (at least three images). The multiple images are obtained by changing the position of a light source, and the surface orientation of the object can be determined only in the area of the object illuminated by all light sources. So it is desirable that the number of light sources should be reduced. We propose a method for determining surface orientation along with reflectance, in which only two light sources are used. It is assumed that an object is convex and has a smooth Lambertian surface with locally constant reflectance. We have found the following: there exists a 'separation line' in the image, along which the surface normal is represented as a linear combination of two vectors pointing toward the direction of light sources, and the separation line separates the surface into two regions. Not only when the reflectance is known, but even though the reflectance is unknown, we can determine the surface orientation of the object using the property of the separation line. Here we use the constraint of convexity. Simulations carried out under various situations yielded satisfactory results.

关键词： computer vision

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TECHNIQUES FOR HIGH-PERFORMANCE ANALOG neural NETWORKS 10

TECHNIQUES FOR HIGH-PERFORMANCE ANALOG NEURAL NETWORKS

引用

CONF ON intelligent robots ANd computer vision 10 : neural, biological, ANd 3-d methods

作者： CASASENT, d NEIBERG, L NATARAJAN, S Carnegie Mellon Univ. (United States)

ISBN: (纸本)0819407453

We consider analog neural network implementations (using VLSI or optical technologies) with limited accuracy and various noise and nonlinearity error sources. Algorithms and techniques to achieve high performance (good recognition P'_c% and large storage capacity) on such systems are considered. The adaptive clustering neural net (ACNN) and robust Ho-Kashyap (HK-2) associative processor (AP) are the neural networks considered in detail.

关键词： Neurons Analog electronics neural networks Very large scale integration computer programming Quantization computer vision technology Machine vision Robot vision robots

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TRINOCULAR vision - A 3-d SOLUTION 10

TRINOCULAR VISION - A 3-D SOLUTION

引用

CONF ON intelligent robots ANd computer vision 10 : neural, biological, ANd 3-d methods

作者： BORTOLOZZI, F dUBUISSON, B Compiegne Univ. (France)

ISBN: (纸本)0819407453

This paper presents a solution for the following problems: matching between trinocular images, full reconstruction of 3-d segments without the length constraint, elimination of false triplets. In a first step, cameras are calibrated. This provides high precision perspective transformation matrices and defines the geometry of the system. This approach is used to help the perception of a mobile robot. Our approach for matching is a geometry-based one.

关键词： Image segmentation Cameras 3d vision robots computer vision technology Machine vision Robot vision Imaging systems Matrices 3d image processing

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Line matching in stereo vision 10

Line matching in stereo vision

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intelligent robots and computer vision x: neural, biological, and 3-d methods 1991

作者： Coldwell, Charles E. Fitzer, Jack University of Texas at Arlington Department of Electrical Engineering ArlingtonTX76019 United States

The problem of reconstructing real-world positions of three-dimensional objects from stereo views has proved very difficult, because the problem is inherently underdetermined. By reducing the problem to a one-line problem, and using precision image acquisition hardware, range information may be obtained with relatively simple correlation calculations. © 1992 SPIE. All rights reserved.

关键词： Stereo vision

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THE ENTROPY CONSISTENCY PRINCIPLE IN BINOCULAR STEREOPSIS 10

THE ENTROPY CONSISTENCY PRINCIPLE IN BINOCULAR STEREOPSIS

引用

CONF ON intelligent robots ANd computer vision 10 : neural, biological, ANd 3-d methods

作者： ZHAO, Y Department of Computer Science Trinity College Dublin Ireland

ISBN: (纸本)0819407453

This paper presents a new theoretical entropy formalism to stereo vision - an entropy view of stereopsis. At the heart of this formalism is the entropy consistency principle. It reflects the essential "active" and "dynamic" nature of binocular stereo vision process. Finally, an experimental stereo system based on mathematical morphology is proposed and is integrated into the entropy formalism presented in this paper. © 1992 SPIE. All rights reserved.

关键词： Entropy

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