We present a novel design and implementation of a foveated wide angle lens. It is strongly motivated towards applications for activevision in complex and dynamic environments. The projection curve is designed so that...
详细信息
We present a novel design and implementation of a foveated wide angle lens. It is strongly motivated towards applications for activevision in complex and dynamic environments. The projection curve is designed so that it facilitates activevisionalgorithms for motion analysis, object identification, and precise fixation. The implementation achieves small size and light weight so that the lens can be swung at a high speed.
A robot based intelligent system is proposed and used to improve the accuracy and throughput rate of a dynamic checkweigher. Classical filtering techniques as well as some other signal processing techniques provide ce...
详细信息
ISBN:
(纸本)0819416886;9780819416889
A robot based intelligent system is proposed and used to improve the accuracy and throughput rate of a dynamic checkweigher. Classical filtering techniques as well as some other signal processing techniques provide certain improvements in the accuracy and the effect of high frequency noise in a conventional checkweigher. A large amount of inaccuracy from system low frequency components still remains. The developed system includes a fuzzy controller for the weighing cell which is an essential pat of many static and dynamic systems used for weighing. The system also includes a robot arm for package handling through the weighing process to reduce the effect of the low frequency noise (0 - 10 HZ) associated with the conveyor belt systems in the conventional checkweighers. A motion planning for the robot arm is investigated to satisfy the safety requirements for the packages and robot arm and to enhance the throughput rate of the overall system. The use of such intelligent systems for weighing and transport overcome the nonlinearity problems associated with the system and reduces greatly the noise effect in conventional checkweighers. The experimental results are introduced an analyzed to investigate the efficiency of the developed system.
This paper presents an overview of the development of visionalgorithms for a flexible inspection system. This system is being designed for the inspection of surface mounted devices. The system identifies missing comp...
详细信息
ISBN:
(纸本)0819416894
This paper presents an overview of the development of visionalgorithms for a flexible inspection system. This system is being designed for the inspection of surface mounted devices. The system identifies missing components and quantifies the position and rotation of the components present. Two types of approaches for the identification of missing components are presented and contrasted. The first approach involves conventional image processing techniques that are actually used in an operative prototype that is under test in an industrial environment. The second approach is a study of the use of backpropagation neural networks in as an alternative inspection method for component detection only.
The proceedings contains 48 papers. Following topics are discussed: mobile robotic techniques;activevision;materials handling;industrial inspection and applications;three-dimensional vision - cameras, hardware, and c...
详细信息
ISBN:
(纸本)0819416894
The proceedings contains 48 papers. Following topics are discussed: mobile robotic techniques;activevision;materials handling;industrial inspection and applications;three-dimensional vision - cameras, hardware, and calibration;three-dimensional vision - image processing;three-dimensional vision - depth determination;and three-dimensional vision - image reconstruction.
The proceedings contains 48 papers. Following topics are discussed: mobile robotic techniques;activevision;materials handling;industrial inspection and applications;three-dimensional vision - cameras, hardware, and c...
详细信息
ISBN:
(纸本)0819416894
The proceedings contains 48 papers. Following topics are discussed: mobile robotic techniques;activevision;materials handling;industrial inspection and applications;three-dimensional vision - cameras, hardware, and calibration;three-dimensional vision - image processing;three-dimensional vision - depth determination;and three-dimensional vision - image reconstruction.
Using computervision to recognize 3-D objects is complicated by the fact that geometric features vary with view orientation. The key in designing recognition algorithms is therefore based on understanding and quantif...
详细信息
ISBN:
(纸本)0819416894
Using computervision to recognize 3-D objects is complicated by the fact that geometric features vary with view orientation. The key in designing recognition algorithms is therefore based on understanding and quantifying the variation of certain cardinal features. The features selected for study in the research reported in this paper are the angles between landmarks in a scene. The spatial arrangement of landmarks on an object may constitute a unique characteristic of that object. As an example the angles between the wing tips and the nose cone of an aircraft may be adequate in distinguishing amongst a given class of aircraft. In a class of polyhedral objects the angles at certain vertices may form a distinct and characteristic alignment of faces. For many other classes of objects it may be possible to identify distinctive spatial arrangements of some readily identifiable landmarks. In this paper we derive the two dimensional joint density function of two angles in a scene given an isotropic view orientation and an orthographic projection. This analytic expression is useful in deriving likelihood functions which may be used to obtain measures of the likelihood of angle combinations in images of known objects or scenes. These likelihood functions allow us to establish statistical decision schemes to recognize objects. Experiments have been conducted to evaluate the usefulness of the proposed methods.
In this research we propose solutions to the problems involved in gaze stabilization of a binocular activevision system, i.e., vergence error extraction, and vergence servo control. Gazing is realized by decreasing t...
详细信息
ISBN:
(纸本)0819416894
In this research we propose solutions to the problems involved in gaze stabilization of a binocular activevision system, i.e., vergence error extraction, and vergence servo control. Gazing is realized by decreasing the disparity which represents the vergence error. A Fourier transform based approach that robustly and efficiently estimates vergence disparity is developed for holding gaze on selected visual target. It is shown that this method has certain advantages over existing approaches. Our work also points out that vision sensor based vergence control system is a dual sampling rate system. Feedback information prediction and dynamic vision-based self-tuning control strategy are investigated to implement vergence control. Experiments on the gaze stabilization using the techniques developed in this paper are performed.
Depth map recovery is one of the central tasks in activevision systems. In many applications such as path planning and collision avoidance, there is a clear need for obtaining a coarse depth map of the environment in...
详细信息
ISBN:
(纸本)0819416894
Depth map recovery is one of the central tasks in activevision systems. In many applications such as path planning and collision avoidance, there is a clear need for obtaining a coarse depth map of the environment in a reasonable amount of time. Traditionally, stereo vision techniques have been used for depth map recovery. Such methods require that features are first found and then correctly corresponded between two images. However, in real images, stereo vision techniques not only are computationally time consuming but also suffer from errors in feature detection and correspondence. This paper describes the theory and implementation issues of depth map recovery from a sequence of two monocular images without prior knowledge of the involved motion. Our technique does not use either optical flow or feature correspondence. Instead, the spatio-temporal gradients of the input intensity images are used directly. The experimental results of implementing this method on real images are presented. Furthermore, important implementation issues such as detecting and correcting depth map flaws are discussed and techniques for overcoming such practical problems are described and tested. We also investigate the influence of subsampling on the quality of the recovered depth maps and introduce some more sophisticated techniques.
This paper describes a pyramidal robust algorithm dedicated to the depth-from-motion problem (computation of the third dimension in the case of a moving monocular camera). We propose a direct method that does not requ...
详细信息
ISBN:
(纸本)0819416894
This paper describes a pyramidal robust algorithm dedicated to the depth-from-motion problem (computation of the third dimension in the case of a moving monocular camera). We propose a direct method that does not require the tedious computation of optical flow. Depth is obtained from cinematic parameters and gradients of image brightness. As with many of the early vision problems, this one is ill-posed and regularization techniques are used to recover a unique stable solution. In the presence of noisy image acquisition and motion discontinuities, the estimation of optical flow is reformulated in robust estimation framework. To improve our algorithm to large motions, we use a multi-resolution scheme. Some experimental results are shown both on simulated and real images.
One of the main problems in a 3D computer-aided reconstruction lies in the fact that the obtained result depends on the cross sections acquisition way. If the interslice distance between successive contours is greater...
详细信息
ISBN:
(纸本)0819416894
One of the main problems in a 3D computer-aided reconstruction lies in the fact that the obtained result depends on the cross sections acquisition way. If the interslice distance between successive contours is greater than the in-plane resolution, we can generate a coarse representation of the physical scanned object. In this paper, we present an elastic contour interpolation scheme to refine 3D object reconstruction from serial cross sections.
暂无评论