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 46 for “"Feature Matching"”.
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Image feature matching using polynomial representation of chain codes
… the descriptor when attempting to match features from pairs of similar images. In addition, a formal algebra is developed that provides the rule base that enables the transformation and manipulation of chain encoded boundary images. The foundation of this algebra is based on the notion …
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Identifying Robust SIFT Features for Improved Image Alignment
… thesis, we will study different ways to improve feature matching by increasing the quality and reducing the number of SIFT features. We created an algorithm to identify robust SIFT features by evaluating how invariant individual feature points are to changes in scale. This allows us to exclude …
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An Approach to Automatic Selection of the Optimal Local Feature Detector
Feature matching techniques have significantly contributed in making vision applications more reliable by solving the image correspondence problem. The feature matching process requires an effective feature detection stage capable of providing high quality interest points. The effort of the …
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Geometric Principles of Multiple Visual Sensors
… on the multiple-view matrices of image features. This approach can be applied to characterize the algebraic conditions governing the multiple views of any type of image features and any kind of incidence relations. A set of linear iterative 3-D reconstruction algorithms have been …
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Sequential Motion Estimation and Refinement for Applications of Real-time Reconstruction from Stereo Vision
This paper presents a new approach to the feature-matching problem for 3D reconstruction by taking advantage of GPS and IMU data, along with a prior calibrated stereo camera system. It is expected that pose estimates and calibration can be used to increase feature matching speed and accuracy. Given …
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Cheyenne Verb Agreement in Gpsg (Generalized Phrase Structure Grammar)
… Agreement in this theory works by a mechanism of feature matching among nodes of a tree diagram which represents the structure of units of the language, either words or individual morphemes.
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Reasoning and memory : multiple simple response strategies are used in visual working memory for color-orientation binding /
… Cowan, 2013; Hardman and Cowan, 2016). In the featurematching task, a WM task, deductive reasoning (Deduction) can be used to determine that knowledge of one binding between colors and orientations (blue/left) precludes a different binding (blue/up), given that each color can only be paired …
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Magnitude Recoding in Variable-Range Memorial Comparisons
… discrete code model, claims that size codes or features are compared, and that time to judge remembered size reflects feature-matching operations. It is argued that efficiency considerations determine how codes are generated from the data base. Consequently, propositional models predict that …
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Online 3D Reconstruction and Ground Segmentation using Drone based Long Baseline Stereo Vision System
… implementations in Point Cloud Library (PCL) and feature matching on graphics processing unit (GPU) using OpenCV with CUDA. Besides 3D reconstruction, the challenge in the project was speed and several steps and ideas are presented to achieve it. Presented 3D reconstruction algorithm uses feature …
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Automatic Alignment of 3D Multi-Sensor Point Clouds
… graphics. In this research, two keypoint feature matching approaches have been developed and proposed for the automatic alignment of 3D point clouds, which have been acquired from different sensor platforms and are in different 3D conformal coordinate systems. The first proposed approach …
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High-throughput phenotyping technology for corn ears
… cap percentage (the proportion of the ear that features kernels versus the barren area). The main image processing functions used here were segmentation, skewness correction, morphological operation and image registration. To obtain a kernel count, an “ear map” was constructed using both a …
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Surfaces From Stereo: An Integrated Approach
… approach is to first identify corresponding features between the two images, then interpolate to obtain a complete distance or depth map. Traditionally, the most difficult problem has been to correctly match the corresponding features. Also, occluding and ridge contours (depth and orientation …
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3D reconstruction and camera calibration from 2D images
… the stereo image pair, a process involving feature matching in both images. The second step estimates the affine geometry, a process of finding a special plane in projective space by means of vanishing points. Camera calibration forms part of the third step in obtaining the metric geometry, …
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Form processing with the Hough transform
… off-line to master forms to calculate form features and build-up the feature database, and it is performed on-line for the input (scanned) forms to extract features to identify the form type based on feature matching. The derived features are rotation, translation and scale invariant. The …
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Optimizing Harris Corner Detection on GPGPUs Using CUDA
… corner detection algorithm was then applied to a feature matching computer vision system, which showed significant speedup over the other platforms.</p>
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Development of an image matching scheme using feature- and area based matching techniques
Image matching is widely considered to be one of the most difficult tasks of a digital photogrammetric system. Traditionally image matching has been approached from either an area based or a feature based point of view. In recent years significant progress has been made in Area Based Matching (ABM) …
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Improvements in digital image correlation and application in material mechanical test
… method and reference frame update strategy. The feature matching based method is proposed to provide an initial guess for all points of interest with semi-subpixel level accuracy in cases with small or large translation, deformation, or rotation. The bisection searching strategy is presented to …
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Comparative analysis of image search algorithm using average RGB, local color histogram, global color histogram and color moment HSV
… (CBIR) makes use of the available visual features of the image and helps in retrieving similar image as that of the query image. In the CBIR method, each image stored in the database has its features extracted and compared to the features of the query image. Thus, it involves two …
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An Experimental Evaluation of Learning-Based Methods for Loop Closure Detection in Simultaneous Localization and Mapping
… and map estimates. This project evaluates ORB feature extraction and matching, a state-of-the-art technique to detect loop closures, against recently developed learning-based approaches. In particular, our first contribution is to benchmark established techniques based on hand-crafted …
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Video Object Counting in Unconstrained Environments Using Density-Based Clustering
… object counting approach using multiple local feature matching. We explain the development of a dataset with which to test our approach. Our dataset uses a new approach which we designed to extract object ground truth. We also provide a comparison of common single object trackers. We develop a …
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