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In order to get full 3D model from consumer depth cameras, previous approaches used set of synchronized depth cameras or moved the depth sensor around the target object. This on-going work introduces a cost effective and convenient framework for filming dynamic 3D object. This set is comprised of a consumer depth camera, or RGBD sensor and a pair of mirrors. Because of the images reflected from two...
As a part of a driver assistance system, vehicle topview system plays an important role in driving safety. The objective of this research is to develop a vision-based top-view system to expand drivers' field of view. Four cameras provide a 360-degree view of the surrounding terrain of the vehicle, and the destination image is composed by these four processed images. In this paper, we divide the procedure...
In this paper, we propose a robust curved lane marking detection method by first detecting a straight lane and applying a geometric model of that detected straight lane. In our proposed method, we first detect the straight line and generate 13 candidates of the curved lane by applying a geometric model. We then vote those candidates on the feature image and consider the candidate which acquires the...
This paper presents a novel monocular vision-based realtime obstacle detection and avoidance for a low cost unmanned aerial vehicle (UAV) in an unstructured, GPS denied environment. We propose a mathematical model to estimate the relative distance from the UAV's camera to an obstacle which will subsequently be used in a collision avoidance algorithm. We validate our model with some real time experiments...
Effects of air flow on droplet removal from wafer were investigated as the fundamental study of CMP cleaning. Deformation and movement of droplet on wafer by air flow were visualized by a high speed camera, and characteristics of droplet behavior were evaluated. Effects of wafer film types (Two types of wafer, Type-A and Type-B were used in this study) on droplet behavior were also investigated. Droplet...
Within the newly defined 3D maps, many extracted visual keypoints have been assigned with real-world coordinates. Such geospatial information can make monocular visual navigation feasible as a camera on the user platform that can capture the common keypoints within the 3D maps, and then, the coordinates and attitude of the user's platform can be determined. However, multiple faults within visual measurements...
This work aims at investigating the subject of formation control, i.e. controlling a group of mobile robots to make them form a specific geometric pattern and, additionally, to have them maintain this pattern while moving. In view of this two-fold scope, we have conducted experiments using mobile robots equipped with an on-board camera that, by means of a stepper motor, can rotate over 360°. Within...
Vision-based road signs detection and recognition has been widely used in intelligent robotics and automotive autonomous driving technology. Currently, one-time calibration of inverse perspective mapping (IPM) parameters is employed to eliminate the effect of perspective mapping, but it is not robust to the uphill and downhill road. We propose an automatic inverse perspective mapping method based...
This paper introduces a novel, robust and efficient approach for metric velocity estimation using multiple cameras with no overlapping fields of view. By incorporating rotation priors, the metric velocity estimation problem reduces to solving a set of linear equations. To determine the metric velocity, a total of three temporal point correspondences provided by at least two cameras are required. This...
In this paper, the correction of motion-induced high frequency artifacts on sequences of thermographic images by a real-time capable approach based on Cellular Nonlinear Networks (CNN) is evaluated. For comparison, an offline analysis of frequency subspaces is presented and results will be compared. Both simulated data sets as well as data sets recorded during neurosurgery are considered as inputs...
For high speed maglev using ElectroMagnetic Suspension(EMS) as levitation method, the gap between vehicle and guideway surface is maintained by only about 10mm. Therefore, to prevent the contact and improve the ride comfort, the guideway irregularity should be controlled below a certain level. Especially, the LSM stator pack attached under guideway should be clamped without any looseness, otherwise...
Research the collision detection of the unattended substation high-voltage warning area purposed to find a balance between real-time and accuracy, we proposed a detection algorithm based on the moving capsule body collide high-voltage warning area within the scope of the video crossing areas: centered on each camera, built a combination of polynomials of the high-voltage warning area polygon, used...
We propose a method for estimating the rectification homography of ground plane image using the plane's vertical vanishing point. First, the method computes the image of the horizon by a vertical prism pole in the image. Then, the two imaged circular points of the ground plane are computed from the image of absolute conic and the imaged horizon. At last, the image rectification is computed from the...
An image-based strategy visual servo control via Hamiltonian approach for a binocular camera-in-hand robotic system is considered. A new Hamiltonian realization is designed for the visual servo control systems which consider the dynamics of the robotic systems. The designed system can be modeled as a port-controlled Hamiltonian (PCH) system. We give the stability analysis about the PCH system. Simulation...
In view of the defects of recognition value of the existing high precision pointer meter, we developed a set of system of automatic reading based on automatic alignment control for pointer meter. We transformed the existing operating table, added to a set of system of camera automatic alignment, and accomplished the camera aimed automatically based on machine vision. Regarding recognition value, we...
Researchers at Lawrence Livermore National Laboratory (LLNL) have started digitizing technical films spanning the above ground atmospheric nuclear testing operations conducted by the United States from 1950 through the 1960s. This technical film test data represents unique information that can be use as a primary validation data source for nuclear effects codes that are used by national researchers...
This paper presents an immersive and highly responsive virtual 3D environment. By combining state of the art 3D display device zSpace and a high speed 499 fps hand gesture interface system a truly immersive system is achieved. Truly immersive virtual 3D environment can only be achieved with low latency interaction. Utilizing high speed camera, the system is capable of detecting two hands simultaneously...
The video captured from forward moving camera has been used for environment surveillance, endoscopy, pipeline inspection and mobile navigation, from which 3D information acquisition will further facilitate the applications. In this paper, we proposed a new method named bi-slit projections to achieve the stereo imaging from forward motion video captured by only single camera. The method only requires...
Fog is one of the most dangerous weather phenomena in driving scenarios that can benefit from driving assistance systems. For this reason we have developed an affordable advanced driving assistance solution that runs on Android based smart mobile platforms. Our system is able to detect the presence of fog in images captured from a moving vehicle, to estimate the fog's density, compute the visibility...
This paper presents a camera-laser projector based system for the real-time estimation of distance to obstacles designed to assist wheelchair users with cognitive impairment. Upon falling under the specified safe distance to an obstacle an alarm alerts that it can be used by the control system to act immediately to avert a possible collision even before the user stops the wheelchair. This system consists...
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