A task in a distributed computing system consists of a set of related modules. Each of the modules will execute on one of the processors of the system and communicate with some other modules. In addition, precedence r...
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ISBN:
(纸本)0819413216
A task in a distributed computing system consists of a set of related modules. Each of the modules will execute on one of the processors of the system and communicate with some other modules. In addition, precedence relationships may exist among the modules. Task allocation is an essential activity in distributed-software design. This activity is of importance to all phases of the development of a distributed system. This paper establishes task completion-time models and task allocation models for minimizing task completion time. Current work in this area is either at the experimental level or without the consideration of precedence relationships among modules. The development of mathematical models for the computation of task completion time and task allocation will benefit many real-time computer applications such as radar systems, navigation systems, industrial process control systems, image processing systems, and artificial intelligence oriented systems.
This paper presents an effective corner detector based on perceptual organization and a curve tracking scheme. The detector first finds 2-D corners among the curve partitioning points. It then locates 3-D corners by d...
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ISBN:
(纸本)0819410268
This paper presents an effective corner detector based on perceptual organization and a curve tracking scheme. The detector first finds 2-D corners among the curve partitioning points. It then locates 3-D corners by detecting the terminations of tracked curves intersecting at 2-D corners. It then assigns an attribute value according to its perceptual structure to each detected corner. The corner detector is a very important image analysis component in both 2-D and 3- D vision systems. Experimental results demonstrate its effectiveness and robustness.
This paper analyzes the issues involved in developing an intelligent production control system. It describes the basic characteristics of a production control system and an effective design methodology to realize the ...
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ISBN:
(纸本)0819410268
This paper analyzes the issues involved in developing an intelligent production control system. It describes the basic characteristics of a production control system and an effective design methodology to realize the production control functions. Petri net, subsystem and hierarchical control concepts are applied to a computer integrated material handling system (MHS). Some communication and interface requirements of the MHS are also considered in this paper. The control system solution is illustrated with an actual MHS operation case which indicates that a truly flexible and integrated production system can be realized with a Petri net operation model and a hierarchical control structure. The significance of this work is related to the different operation testing and evaluation requirements encountered in manufacturing.
The selection and placement of cameras and light sources for a specific task (e.g., locating a part in a tray or inspecting an object) is one of the most important steps in creating a successful vision system, because...
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ISBN:
(纸本)0819410276
The selection and placement of cameras and light sources for a specific task (e.g., locating a part in a tray or inspecting an object) is one of the most important steps in creating a successful vision system, because obtaining high-quality images can greatly simplify the visionalgorithms and improve their reliability. We will describe techniques that use a visual task description stated in terms of features to be detected, and derive a range of light-source locations that satisfy the task requirements. In particular, given a task description that specifies particular object edges to be detected with a given edge detector (e.g., a Sobel edge operator), our techniques determine the constraints on light-source location such that the edge is detected.
This conference proceedings contains 50 papers. The topics discussed are wavelets, multiresolution, and Gabor techniques;neural net methods in robotics and computervision;neuromorphology of biological vision as a bas...
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ISBN:
(纸本)0819410276
This conference proceedings contains 50 papers. The topics discussed are wavelets, multiresolution, and Gabor techniques;neural net methods in robotics and computervision;neuromorphology of biological vision as a basis for machine vision;fuzzy reasoning in pattern recognition;predictive 3-D vision;and 3-D vision methods.
The field of computervision has long been interested in disparity as the cue for the correspondence between stereo images. The other cue to correspondence, blur, and the fact that vergence is a combination of the two...
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ISBN:
(纸本)0819410268
The field of computervision has long been interested in disparity as the cue for the correspondence between stereo images. The other cue to correspondence, blur, and the fact that vergence is a combination of the two processes, accommodative vergence and disparity vergence, have not been equally appreciated. Following the methodology of active vision that allows the observer to control all his visual parameters, it is quite natural to take advantage of the powerful combination of these two processes. In this article, we try to elucidate such an integration and briefly analyze the cooperation and competition between accommodative vergence and disparity vergence on one hand and disparity and blur stimuli on the other hand. The human fixation mechanism is used as a guide-line and some virtues of this mechanism are used to implement a model for vergence in isolation. Finally, some experimental results are reported.
This paper describes work in progress on a set of visual routines and supporting capabilities implemented on the PRISM-3 real-time vision system. The routines are used in an outdoor robot retrieval task. The task requ...
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ISBN:
(纸本)0819410268
This paper describes work in progress on a set of visual routines and supporting capabilities implemented on the PRISM-3 real-time vision system. The routines are used in an outdoor robot retrieval task. The task requires the robot to locate a donor agent - a Hero2000 - which holds the object to be retrieved, to navigate to the donor, to accept the object from the donor, and return to its original location. The routines described here will form an integral part of the navigation and wide-area search tasks. Active perception is exploited to locate the donor using real-time stereo ranging directed by a pan/tilt/verge mechanism. A framework for orchestrating visual search has been implemented and is briefly described.
This paper describes an active vision system which employs two high-resolution cameras for image acquisition. The system is capable of automatically directing movements of the cameras so that camera positioning and im...
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ISBN:
(纸本)0819410268
This paper describes an active vision system which employs two high-resolution cameras for image acquisition. The system is capable of automatically directing movements of the cameras so that camera positioning and image acquisition are tightly coupled with visual processing. The system was developed as a research tool and is largely based on off-the-shelf components. A central workstation controls imaging parameters, which include five degrees of freedom for camera positioning (tilt, pan, translation, and independent vergence) and six degrees of freedom for the control of two motorized lenses (focus, aperture, and zoom). This paper is primarily concerned with describing the hardware of the system, the imaging model, and the calibration method employed. A brief description of system software is also given.
We consider morphological processing for clutter reduction and object detection. For detection, we compare a binary and gray-scale Hit-Miss Transform and find that the binary operator is preferable. For clutter reduct...
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ISBN:
(纸本)0819410268
We consider morphological processing for clutter reduction and object detection. For detection, we compare a binary and gray-scale Hit-Miss Transform and find that the binary operator is preferable. For clutter reduction, we find gray-scale morphology to be preferable. We present a new gray-scale clutter reduction morphological algorithm for low clutter cases and a new algorithm for high clutter cases. In all morphological processing, we find binary structuring elements to be adequate;this is very attractive for our gray-scale morphology decomposition algorithm and its optical implementation.
Much of the recent interest in active vision has focussed on the development of novel methods for controlling fast pan/tilt camera mounts, called eye-head systems. Simple real-time processing of input images coupled w...
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ISBN:
(纸本)0819410268
Much of the recent interest in active vision has focussed on the development of novel methods for controlling fast pan/tilt camera mounts, called eye-head systems. Simple real-time processing of input images coupled with fast control has enabled interesting system behaviors. This paper describes the ongoing development of behavior-based control methods for a miniature eye-head system. We first describe the eye-head hardware and image processing system. We then define and present approaches for behavior-based control of the eye-head system. Finally, we discuss results from the use of simple behaviors for verging two cameras on moving objects.
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