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 20 of 22 for “"homography"”.
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Homography-Based State Estimation for Autonomous Exploration in Unknown Environments
… Speeded-Up Robust Features (SURF) points and the homography relationship that relates the camera motion to the locations of tracked planar feature points in the image plane. An extended Kalman filter implementation is developed to perform sensor fusion using measurements from an onboard inertial …
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Distortion Correction for Non-Planar Deformable Projection Displays through Homography Shaping and Projected Image Warping
… shape of the undistorted view through a 2D homography, (ii) transforming the feature points on the camera images to control points on the projected images, (iii) calculating Radial Basis Function (RBF) warping coefficients from the control points, and warping the projected image to obtain an …
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A feature-based fingerprinting scheme robust to desynchronization
… (affine transforms), and more complex ones (homography and image warping). Our Estimation-Elimination algorithm estimates the attack parameters by matching image features and eliminating iteratively suspected outliers. We also compare this method to an adapted version of RANSAC (Random Sample …
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A Low-Cost Computer Vision Approach for Objectively Evaluating Triple Jump Technique: Proof of Concept
… distance. Central to the framework is the use of homography transformations, which enabled the conversion from GMP pose data to real-world coordinates to calculate triple jump performance metrics, including horizontal and vertical centre of mass velocities, last stride velocity, effective …
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Planar Motion and Visual Odometry: Pose Estimation from Homographies
… the method in Paper A to use more than one homography at a time in the estimation process, thereby improving the estimation accuracy and robustness. Paper C presents an alternative method for estimating the distance between camera positions that is independent of the estimated orientation of …
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Real-Time Implementation of Vision Algorithm for Control, Stabilization, and Target Tracking for a Hovering Micro-UAV
… correlator, RANSAC similarity-constrained homography, color segmentation, radial distortion correction, and an extended Kalman filter with a standard-deviation outlier rejection technique (SORT). This implementation was designed specifically for use as an on-board vision solution in …
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Computation of Suitable Grasp Pose for Usage of Objects Based on Predefined Training and Real-time Pose Estimation
… pose detection and estimation system and a homography-based planar pose detection and estimation system. We conducted experiments using a humanoid PR2 robot. We used the Robot Operating System as the primary framework of the system and MoveIt Interface for manipulation of grasps. The …
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3D particle tracking velocimetry using synthetic aperture imaging
… method for reconstructing volumes, based on a homography fit (HF) refocusing method, is proposed which facilitates rapid processing of large amounts of data recorded using high speed cameras for example. The capability of using SA imaging to conduct PTV is demonstrated by tracking located …
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Augmenting complex surfaces with projector-camera systems
… Augmented Reality. We present a novel initial homography estimation for interactive projector-camera calibration. We introduce a unique hybrid projector pattern codification technique for improved correspondences. Finally, we present interactive surface particles, which are a surface independent …
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The effect of printed word attributes on Arabic reading
… pronunciations and meanings. The high level of homography is believed to present difficulties for the skilled reader. However, this is the first study to gather empirical evidence on what readers know about the different words that can be associated with each homograph. There are few studies of …
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High throughput livestock monitoring using computer vision
… the floor at the handover time using inter-view homography. Additionally, we estimate the time spent at the feeder and drinker for each pig based on proximity to the feeder or drinker. For evaluating the detection module, we use the usual average height (precision) of the precision-recall curve; …
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Collaborative Path Planning and Control for Ground Agents Via Photography Collected by Unmanned Aerial Vehicles
… the environ- ment, as seen by the UAV. A deep homography model incorporates temporal relations across video frames to stitch cost maps together. A weighted version of a navigation algorithm is presented to plan a path through the environment. The synthesis of these modules leads to a novel …
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Real-Time Forward Urban Environment Perception for an Autonomous Ground Vehicle Using Computer Vision and LIDAR
… image coordinates to UTM coordinates using a homography transform created during the camera calibration procedure. A novel system for rapid camera calibration was also implemented. Algorithms investigated during the development phase of the project are included in the text for the purposes of …
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Obstacle and Change Detection Using RGB Cameras
… FLANN based matcher, and filtered through RANSAC Homography estimation in threadpooling architecture for the dataset reduction and detec- tion. In machine learning based approach, features are extracted using four pre-trained CNN models such as MobileNetV3-large, EfficientNetB3, ResNet50, and …
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Vision-based robust structural dynamic monitoring and modal identification using stationary and drone-based imaging systems.
… parameters via ego-motion compensation and homography-based mapping. The feasibility of drone-based modal identification is evaluated through laboratory and field experiments, highlighting practical limitations in the estimation of the dynamic measurements under low signal-to-noise ratio …
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Fast VMZ : code enhancements for video mosaicing and summarization
… up robust features for its feature matching and homography estimation pipeline, which are the most computationally expensive modules in the VMZ pipeline. Due to these long-running compute-intensive modules, the VMZ pipeline is not suitable for real-time mosaic formation in drones or UAVs. For …
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Optimization by Gaussian smoothing with application to geometric alignment
… of common motion models, such as affine and homography, there exists a corresponding integral operator on the image space. We refer to the kernels of such integral operators as transformation kernels. Thus, instead of convolving the objective function with a Gaussian kernel in transformation …
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Towards real-time light field processing for quantitative imaging and perception
… 3D PIV techniques. In addition, coupled with the homography fit method based SA reconstruction technique, presented results show that SAPIV, for the same experimental setup, is significantly faster and cheaper while achieving the same high level of accuracy. Developments of theoretical aspects of …
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Multimodal Indexing of Presentation Videos
… algorithm is then applied to estimate the homography among a set of video frames and median blending is used to render pixels in overlapping regions of the mosaic. For two of these indexes, namely faces and diagrams, we present two novel MTurk-derived user data collections to determine …
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Control visual basado en características de un sistema articulado. Estimación del jacobiano de la imagen utilizando múltiples vistas
… of mobile robots using the estimation of the homography between a plane and the image is described.
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