Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"visual sensors"”.
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Geometric Principles of Multiple Visual Sensors
… building a large scale system with distributed visual sensors. I have developed a unified algebraic approach for studying the structure-from-motion problem, which is a set of rank conditions on the multiple-view matrices of image features. This approach can be applied to characterize the …
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Video based structural health monitoring using virtual visual sensors
… and repair. Traditionally, discrete contact sensors such as strain gages or accelerometers have been used for SHM. However, distributed remote sensors could be advantageous since they don’t require cabling and can cover an area rather than just a few discrete points. Along this line a novel …
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Fusion of non-visual and visual sensors for human tracking
… may not be successfully tracked with merely the visual information in challenging cases such as long-term occlusion. Thus, we propose to combine information from other sensors with the surveillance cameras to persistently localize and track humans, which is becoming more promising with the …
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Vision Based Guidance and Flight Control in Problems of Aerial Tracking
The use of visual sensors in providing the necessary information for the autonomous guidance and navigation of the unmanned-air vehicles (UAV) or micro-air vehicles (MAV) applications is inspired by biological systems and is motivated first of all by the reduction of the navigational sensor cost. …
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Development of small-diameter endoscope capable of high-resolution visualization and laser therapy through a shared optical aperture
… frequently hosts technologies to illuminate, visualize, and apply a phototherapy laser to a surgical scene. Unfortunately, some candidate MIS procedures are not presently possible due to the insufficiently small diameter of currently available endoscopes, which is the result of illumination, …
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Robotic Cameraman for Augmented Reality based Broadcast and Demonstration
… algorithm reduces the dependency on high quality visual sensors and solves theproblems of low contour extraction accuracy in motion blurred images. Secondly, aplane-based visual mapping algorithm is introduced to solve the difficulties of visualmapping in these low-texture scenarios. Finally, a …
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Development of an obstacle detection and navigation system for autonomous powered wheelchairs
… The add-on system comprised of stereo vision sensors (ZED Camera), and IMU is designed to use Robot Operating System (ROS) to communicate and control the movement of the wheelchair. With the addition of a 3D map of the environment generated using visual sensors through ROS packages, the system …
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Multi-session Visual Simultaneous Localisation and Mapping
… depended on active ranging and proprioceptive sensors, more recently multiple approaches have been reported that rely purely on visual sensors. Visual sensors provide much richer measurements of the environment and bring with them a wealth of techniques from the field of computer vision in …
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A multisensory observer model for human spatial orientation perception
… and motion predictions can be plotted in 2D or visualized in 3D using virtual avatars. Our Observer's internal model now computes azimuth, and pseudointegrates linear motion in an allocentric reference frame (perceived north-east-down). The model mimics the large perceptual errors for vertical …
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Using 3D Visual Data to Build a Semantic Map for Autonomous Localization
… carry out tasks. Traditional maps built by visual sensors include metric ones and topological ones. These maps are navigation-oriented and not adequate for service robots or intelligent gadgets to interact with or serve human users who normally rely on conceptual knowledge or semantic …
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Direct Visual and Inertial Odometry for Monocular Mobile Platforms
Nowadays visual and inertial information is readily available from small mobile platforms, such as quadcopters. However, due to the limitation of onboard resource and capability, it is still a challenge to developing localisation and mapping estimation algorithms for small size mobile platforms. …
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Trust and reputation in multi-modal sensor networks for marine environmental monitoring
… use of a multi-modal sensor network utilising visual sensors, modelled outputs and context information alongside the more conventional in-situ wireless sensor networks. However each of these addi- tional data streams are unreliable. Hence we adapt a trust and reputation model for optimising …
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Computer vision-based structural assessment exploiting large volumes of images
<p>Visual assessment is a process to understand the state of a structure based on evaluations originating from visual information. Recent advances in computer vision to explore new sensors, sensing platforms and high-performance computing have shed light on the potential for vision-based visual …
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Deployment, Coverage And Network Optimization In Wireless Video Sensor Networks For 3D Indoor Monitoring
… However, traditional wsns employ such sensors as thermal or photo light resistors that are often modeled with simple omni-directional sensing ranges, which focus only on scalar data within the sensing environment. In contrast, the sensing range of a wireless video sensor is directional …
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Computer vision based classification of fruits and vegetables for self-checkout at supermarkets
… of this PhD work are: (a) exploring the types of visual and non-visual sensors that could be incorporated into a self-checkout system for classification of fruits and vegetables, (b) determining a suitable feature representation method for fresh produce items available at supermarkets, (c) …
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Cooperative mobile robot and manipulator system for autonomous manufacturing
… robot. One positioning approach is ultrasonic sensors fused with an inertial measurement unit (IMU) by using the filtered extended Kalman filter (EKF) algorithm and another positioning approach is vision-based positioning by identifying ArUco marker. Crucially, to ensure the robustness of …
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Vision-Based Obstacle Avoidance for Multiple Vehicles Performing Time-Critical Missions
This dissertation discusses vision-based static obstacle avoidance for a fleet of nonholonomic robots tasked to arrive at a final destination simultaneously. Path generation for each vehicle is computed using a single polynomial function that incorporates the vehicle constraints on velocity and …