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 30 for “"bundle adjustment"”.
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A bundle adjustment solution for a personal computer environment
… of problems in many fields of endeavour. The bundle solution is one technique which has proven very useful and versatile.
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Computer vision system for identifying road signs using triangulation and bundle adjustment
… segments are analyzed using triangulation and Bundle adjustment to determine their physical location relative to the road video log system. Objects having the appropriate color, and physical placement are entered into a sign database. To develop the statistical models used for classification, a …
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Widening the basin of convergence for the bundle adjustment type of problems in computer vision
Bundle adjustment is the process of simultaneously optimizing camera poses and 3D structure given image point tracks. In structure-from-motion, it is typically used as the final refinement step due to the nonlinearity of the problem, meaning that it requires sufficiently good initialization. …
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Efficient Structure and Motion: Path Planning, Uncertainty and Sparsity
… accuracy and a reduced need for costly bundle adjustment operations. In the final paper, a method for efficient solution of bundle adjustment problems based on a junction tree decomposition is presented, exploiting the sparseness patterns in typical structure-and-motion input data.
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The acquisition of spatial data from archival photographs and their application to geomorphology
… was developed is based upon a self calibrating bundle adjustment and both the functional and stochastic models suitable for successful restitution of archival photographs were established. Five computer programs were developed and the algorithms associated with each are given. These programs are …
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Optimal Image-Aided Inertial Navigation
… and stereo camera system. The auto-calibration bundle adjustment utilizes the scale restraint equation, which is free of object coordinates. The number of parameters to be estimated is significantly reduced in comparison with the ones in a self-calibrating bundle adjustment based on the …
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Iterative computation of camera paths in an image based rendering application
… geometric path is found after by applying a bundle adjustment algorithm on these correspondences. Distances between cameras are computed from this initial estimation. The iteration process starts by grouping nearby cameras and then bundle adjusting the groups, and ends by merging the groups. …
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Study of photogrammetric self-calibration adjustment method
… and computer program. A twenty-seven parameter bundle adjustment routine was proposed because of its versatility and compatible use in an existing aerotriangulation package. For the camera and test configuration considered, the focal length was recovered to within two percent, and the principal …
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Large scale structure from motion for autonomous underwater vehicle surveys
… layout in a global frame. From this point a bundle adjustment refines camera and structure estimates. We demonstrate the utility of our techniques using real data obtained during a SeaBED AUV coral reef survey. Test tank results with ground truth are also presented to validate the methodology.
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Learning and Exploiting Camera Geometry for Computer Vision
… to represent the uncertainty in the result of a bundle adjustment problem.</p><p>Another application of these methods is illustrated as part of a novel camera pose estimation algorithm based on object detections. The autocalibration task is formulated as a bundle adjustment problem using prior …
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Local Bundling of Disparity Maps for Improved Dense 3D Visual Reconstruction
… point location using a stereo-constrained local bundle adjustment. The performance of the algorithm is evaluated numerically on synthetic im-agery and qualitatively on real aerial flight data. Results indicate the algorithm produces marked improvement in accuracy and vertical resolution, given a …
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Markerless 3D Motion Capture of Cheetahs in the Wild
… (EKFs), non-linear optimisation and sparse bundle adjustment (SBA) to remove the need for markers to be used in recovering a subject's location from video footage. The result of the project will be the development of a markerless 3D motion-capture system. The thesis discusses the theory …
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Simultaneous Three-Dimensional Mapping and Geolocation of Road Surface
… (SFM) with multiple views and optimized by Bundle Adjustment (BA). A system is developed for the global reconstruction of 3D road surface. Using the system, the proposed technique globally reconstructs 3D road surface by estimating the global camera pose using the Adaptive Extended Kalman …
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3D sensing and mapping using mobile color and depth sensors
… identify outliers among matching points and use bundle adjustment (BA) to improve the camera pose. We use depth sensors attached to the color camera to estimate the camera’s translation. Thereafter, we create an immersive 3D display in Unity 3D rendering engine to display the stitched scenes in a …
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Lightweight Mapping of Unstructured Environments
… 0.19m, without the need for techniques such as bundle adjustment or loop closure. Towards this contribution, we evaluate the impact of the choice of image feature on the accuracy of the visual odometry as well as the impact of the choice of disparity estimation method on the accuracy. …
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Towards Observable Urban Visual SLAM
… with monocular cameras. It proposes a novel Bundle Adjustment (BA) formulation that addresses the problem from a fundamental approach – by parameterising map points in an on-manifold ray parallax form the SLAM formulation has a stable configuration that guarantees local state observability …
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Validation of a Commercial Ultrasonic Real-Time Location System for Providing Position Constraints in Low-Cost Indoor Photogrammetric Reconstruction
… demonstrated superior performance through 100% bundle adjustment convergence reliability and lower random errors, achieving inter-target distance RMS errors of 2.0–3.3 mm compared to terrestrial laser scan reference data after correcting for systematic scale errors. Critically, this systematic …
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High-Fidelity Image -Based Modeling
… to establish feature correspondences, Standard bundle adjustment software is used with the established feature correspondences to tighten up camera parameters. The proposed method has been tested on various real data sets including objects without salient textures, where feature correspondences …
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Developing an accurate close-range photogrammetric technique for extracting 3D information from spherical panoramic images
… orientation of spherical panoramic images. The bundle adjustment algorithm was then applied to refine the orientation parameters of the panoramas; thus enabling accurate 3D point measurement. Finally, epipolar geometry theory was applied to the oriented panoramas to guide the interactive …
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The mensuration of textured surfaces using close-range digital photogrammetry for applications in industry
… was carried out by means of a fre·e network bundle adjustment. Multi-photo geometrically constrained matching with multi-image correlation was used to determine the conjugate positions of the extracted interest points. Many of the algorithms described in this thesis can generally be applied …
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