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

共 113 条记录，以下是51-60 订阅

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MONOCULAR POSE ESTIMATION OF QUAdRICS OF REVOLUTION 10

MONOCULAR POSE ESTIMATION OF QUADRICS OF REVOLUTION

引用

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

作者： FERRI, M MANGILI, F Univ. di Bologna (Italy) Elsag Bailey Spa (Italy)

ISBN: (纸本)0819407453

The ability to determine an object's position accurately and quickly is important in many robotics tasks. Monocular scene analysis based on perspective projection can be successfully used to solve this problem if a-priori knowledge on objects is available. In this paper analytic procedures for perspective inversion of quadrics of revolution--in particular for spheres, cones and cylinders--are presented. Preliminary experimental results on real images of a test object are provided, with the main goal to test the procedures accuracy and the suitability of the available low-level processing.

关键词： Optical spheres computer vision technology Machine vision robots Image segmentation Robot vision 3d image processing 3d vision Image processing Robotics

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STEREO PAIR dESIGN FOR CAMERAS WITH A FOVEA 10

STEREO PAIR DESIGN FOR CAMERAS WITH A FOVEA

引用

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

作者： CHETTRI, SR KEEFE, M ZIMMERMAN, JR Hughes-STX at NASA/GSFC (United States) Univ. of Delaware (United States)

ISBN: (纸本)0819407453

In this paper we describe the methodology for the design and selection of a stereo pair when the cameras have a greater concentration of sensing elements in the center of the image plane (fovea). Binocular vision is important for the purpose of depth estimation, which in turn is important in a variety of applications such as gaging and autonomous vehicle guidance. Thus, proper design of a stereo pair is essential if we are to be successful in these areas. In this paper we assume that one camera has square pixels of size dv and the other has pixels of size rdv, where 0 < r

关键词： Cameras Error analysis Imaging systems computer vision technology Machine vision Quantization Robot vision robots Photogrammetry Image sensors

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INTERSECTION MAPPINGS FOR STEREO vision 10

INTERSECTION MAPPINGS FOR STEREO VISION

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

作者： NURRE, JH Ohio Univ. (United States)

ISBN: (纸本)0819407453

Stereo vision triangulation methods are used for three-dimensional measurements in conjunction with robot guidance and machine inspection applications. Understanding the computational geometry associated with stereo imaging, gives insight into the accuracy that can be obtained and into the surface types best inspected by such systems. The purpose of this paper is to discuss the shape of the triangulation space arising from stereo imaging for flexible stereo camera configurations. It is shown that the points of intersecting views arising from a stereo pinhole configuration form conic sections, which are a function of the disparity between the pixels in the two images. The significance of this work is that it provides a basis for improved quantitative and qualitative understanding of stereo vision.

关键词： Cameras Robot vision Coded apertures computer vision technology Imaging systems Inspection Machine vision Stereoscopic cameras Image resolution Computing systems

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OPTICAL-IMAGE SEGMENTATION USING WAVELET CORRELATION 10

OPTICAL-IMAGE SEGMENTATION USING WAVELET CORRELATION

引用

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

作者： PINSKI, Sd ROGERS, SK RUCK, dW WELSH, BM KABRISKY, M WARHOLA, G QUINN, d OXLEY, M Air Force Institute of Technology (United States)

ISBN: (纸本)0819407453

This research introduces an optical method of segmenting potential targets using wavelet analysis. An optical Harr wavelet is created using a magneto-optic spatial light modulator (MOSLM). Two methods of controlling wavelet dilation are explored: (1) an aperture positioned in front of a binary modulated MOSLM; (2) spatial filtering of a ternary modulated MOSLM. Segmentation is performed through Vander Lugt correlation of a binarized image with the optical wavelet. Frequency-plane masks for the correlation process are generated using thermal holography.

关键词： Wavelets Image segmentation Spatial filters Optical filters Fourier transforms Holography computer vision technology Machine vision Robot vision robots

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NEURONAL-MORPHOLOGY OF biological vision - A BASIS FOR MACHINE vision 10

NEURONAL-MORPHOLOGY OF BIOLOGICAL VISION - A BASIS FOR MACHI...

引用

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

作者： GUPTA, MM Univ. of Saskatchewan (Canada)

ISBN: (纸本)0819407453

In this paper, we are concerned with the study of the biological vision system and the emulation of some of its mathematical functions, in both the retinal and visual cortex, for the development of a robust computer vision system. This field of research is not only intriguing, but offers a great challenge to systems scientists in the development of functional algorithms. These functional algorithms can be generalized for further studies for fields such as signal processing, control systems and image processing. Our studies are heavily dependent on the use of neuronal layers and the generalized receptive fields. Building blocks of such neuronal layers and receptive fields may lead to the design of better sensors and better computer vision systems. It is hoped that these studies will lead to the development of better artificial vision systems with applications to vision prosthesis for visually impaired persons, robotic vision, medical imaging, medical sensors, industrial automation, remote sensing, space stations and ocean exploration.

关键词： Visualization Sensors Retina Machine vision Visual cortex Information visualization Brain Computing systems computer vision technology Optical fibers

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A REGULAR CURVEd OBJECTS CSG-REP RECONSTRUCTION FROM A SINGLE 2d LINE dRAWING 10

A REGULAR CURVED OBJECTS CSG-REP RECONSTRUCTION FROM A SINGL...

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

作者： WANG, Wd Computer Science Department University of Massachusetts at Lowell Lowell 01854 MA United States

ISBN: (纸本)0819407453

In 1989 SPIE's conference on intelligent robots and computer vision, we presented our approach and algorithm to automatically identify the primitives that are involved in constructing a 3d polyhedral solid. We have since extended our research to introduce more complex primitives. In this paper, we will present an algorithm to reconstruct from a single 2d line drawing the CSG-Rep of a regular curved object, which is generated from a solid modeler with primitive blocks and cylinders. We will demonstrate the difficulties that arise from the introduction of a curved object, the cylinder. We assume that the line drawing of a 3d solid object comes from an orthographic projection of the object from a general view point, that it is perfect, and that it has been labeled with some labeling scheme. We identify the primitives (blocks and cylinders) one by one, find their local to world coordinate transformations, and determine the regularized set operations for the CSG representation. © 1992 SPIE. All rights reserved.

关键词： intelligent robots

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A NEURO-vision PROCESSOR FOR dESIGNING intelligent SENSORS 10

A NEURO-VISION PROCESSOR FOR DESIGNING INTELLIGENT SENSORS

引用

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

作者： GUPTA, MM KNOPF, GK Intelligent Systems Research Laboratory College of Engineering University of Saskatchewan Saskatoon S7N OWO SK Canada

ISBN: (纸本)0819407453

A programmable multi-task neuro-vision processor, called the Positive-Negative (PN) neural processor, is proposed as a plausible hardware mechanism for constructing robust multi-task vision sensors. The computational operations performed by the PN neural processor are loosely based on the neural activity fields exhibited by certain nervous tissue layers situated in the brain. The neuro-vision processor can be programmed to generate diverse dynamic behavior that may be used for spatio-temporal stabilization (STS), short-term visual memory (STVM), spatio-temporal filtering (STF) and pulse frequency modulation (PFM). A multi-functional vision sensor that performs a variety of information processing operations on time-varying two-dimensional sensory images can be constructed from a parallel and hierarchical structure of numerous individually programmed PN neural processors. © 1992 SPIE. All rights reserved.

关键词： Brain

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A PIECEWISE QUAdRATIC neural netWORK FOR PATTERN-CLASSIFICATION 10

A PIECEWISE QUADRATIC NEURAL NETWORK FOR PATTERN-CLASSIFICAT...

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

作者： NATARAJAN, S CASASENT, d Center for Excellence in Optical Data Processing Carnegie Mellon University ECE Department Pittsburgh 15213 PA United States

ISBN: (纸本)0819407453

A neural network pattern classifier is presented. Its decision boundaries are formed from segments of conic sections which allows it to achieve improved performance over piecewise linear neural network classifiers, such as our earlier adaptive clustering neural network (ACNN). We discuss an optical realization that uses complex-valued weights, optical intensity detectors, and an additional input neuron to achieve piecewise conic decision surfaces (rather than the piecewise linear surfaces that the ACNN produces). © 1992 SPIE. All rights reserved.

关键词： Piecewise linear techniques

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TEXTURE OPERATOR dETERMINATION BY SIMULATEd ANNEALING 10

TEXTURE OPERATOR DETERMINATION BY SIMULATED ANNEALING

引用

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

作者： KJELL, B WANG, PY George Mason Univ. (United States)

ISBN: (纸本)0819407453

Convolution of textured images with a set of small masks can be used to produce features for texture classification or for image segmentation. These masks are usually picked from a standard set, such as Laws' texture energy operators or the variations discussed by other researchers. In this paper we discuss using simulated annealing to determine an optimum set of masks for particular sets of textures. Initial masks are picked and iteratively improved by using simulated annealing with an appropriate energy function. The masks converge to a final set that minimizes the energy function. We show experimental results with a small set of textures. The masks produced by the method depends on the textures used, and these masks are more effective in discriminating between these textures than the standard masks.

关键词： Convolution Algorithms Annealing Image classification Mahalanobis distance computer vision technology Image segmentation Machine vision Robot vision robots

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EFFICIENT ACTIVATION FUNCTIONS FOR THE BACK-PROPAGATION neural netWORK 10

EFFICIENT ACTIVATION FUNCTIONS FOR THE BACK-PROPAGATION NEUR...

引用

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

作者： KENUE, SK General Motors Research Labs. (United States)

ISBN: (纸本)0819407453

The back-propagation algorithm is the most common algorithm in use in artificial neural network research. The standard activation (transfer) function is the logistic function s(x) equals 1/(1 + exp(-x)). The derivative of this function is used in correcting the error signals for updating the coefficients of the network. The maximum value of the derivative is only 0.25, which yields slow convergence. A new family of activation functions is proposed, whose derivatives belong to Sechn (x) family for n equals 1,2,.... The maximum value of the derivatives varies from 0.637 to 1.875 for n equals 1-6, and thus a member of the activation function-family can be selected to suit the problem. Results of using this family of activation functions show orders of magnitude savings in computation. A discrete version of these functions is also proposed for efficient implementation. For the parity 8 problem with 16 hidden units, the new activation function f3 uses 300 epochs for learning when compared to 500,000 epochs used by the standard activation function.

关键词： computer programming Neurons Evolutionary algorithms computer vision technology Machine vision Matrices neural networks Robot vision robots Artificial neural networks

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