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 15 of 15 for “"active contours"”.
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Contour Extraction of Drosophila Embryos Using Active Contours in Scale Space
… gaussian scale space of an embryonic image. The active contour model is applied on the images to refine embryo contours. Data cleaning methods are applied to smooth the jaggy contours caused by blurred embryo boundaries. The scale space theory is applied to improve the performance of the result. …
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Using active contours for automated tracking of UV and EUV solar flare ribbons
… We propose an image processing method based on active contours (commonly referred to as ``snakes''), for tracking UV and EUV flare ribbons in images from the transition region and coronal explorer (TRACE). Our method aims to provide an efficient, accurate and automatic tool to aid in the study …
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Automated Visual Database Creation For A Ground Vehicle Simulator
… combines color histogram based segmentation, active contours (snakes) and morphological processing to extract road boundary coordinates for conversion into Matlab or Multigen OpenFlight compatible polygonal representations. Color segmentation uses an initial truth frame to develop a color …
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Multi-stage processing for effective segmentation of SAR sea ice images
… such as Skeletonisation, Morphology and Active Contours. The proposed algorithm is compared against existing techniques such as the Closeness Degree Cut (CDCut) and Level Sets with Distance Regularisation (DRLSE).;Furthermore, a novel Quantitative Analysis technique is proposed which …
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Shape Estimation Using Graph Cut
… an approach called graph cuts based active contours (GCBAC) is proposed, and its applications to 2D object segmentation and three-dimensional (3D) object modeling are discussed. In the application of object segmentation, the presented approach represents the 2D image as an edge …
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Computational Algorithms for Face Alignment and Recognition
… features in images using energy-minimizing active contours. We then conclude with a simple and fast algorithm for locating faces in images. Future research is also discussed.
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Feature extraction via heat flow analogy
… information, where the popular techniques are active contours, region growing, template matching and the Hough transform.<br/><br/>In this thesis, we investigate the heat flow analogy, which is a physics based analogy, both for low-level and high-level feature extraction. Three different …
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Analysis and Measurement of Motion in 2D Medical Imaging Sequences Exploiting Uncertain Knowledge
… in natural-language terms.<br/><br/>In combining active contours with fuzzy logic a novel contour segmentation method is developed which is capable of exploiting uncertain knowledge in both syntactical and linguistic terms. Unlike other approaches the contour description is fully integrated into …
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A multilayered agent society for flexible image processing
… framework for image segmentation motivated by active contours and MultiAgent systems. ASIP is presented in a hierarchical manner as a multilayer system consisting of several high-level agents (layers). The bottom layers contain a society of rational reactive MicroAgents that adapt their …
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Image Analysis Techniques for LiDAR Point Cloud Segmentation and Surface Estimation
… is based on an enhanced version of region-based Active Contours Without Edges (ACWE). We also proposed a noise reduction method using Bayesian approach and incorporated it, along with other noise reduction approaches, into a joint framework that produces robust results. We combined the …
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User aid-based evolutionary computation for optimal parameter setting of image enhancement and segmentation
… and image thresholding tasks by using an interactive evolutionary optimization approach. Eye illusion and image enhancement are subjective human perception-based issues, so, there is no proposed analytical fitness function for them. Their optimization is only possible through interactive …
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Methods and algorithms for quantitative analysis of metallomic images to assess traumatic brain injury
… is developed based on K-means clustering, active contours and Kalman filtering to comparatively study the head kinematics in blast and impact experiments. Then, to compare BNT and INT neuropathology, methods for quantitative analysis of macroscopic optical images and fluorescent images are …
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Large-scale 3D environmental modelling and visualisation for flood hazard warning.
… and an intelligent reconstruction system. The active contours-based multi-resolution vector-valued framework and the multi-seed region growing method are both used for extracting necessary objects from images. The shape match method is used with a template in the spatial domain for a 3D …
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Blood Vessel Segmentation and shape analysis for quantification of Coronary Artery Stenosis in CT Angiography
… the coronary arteries based on the framework of active contours. Both global and local intensity statistics are utilised in the energy functional calculation, which allows for dealing with non-uniform brightness conditions, while evolving the contour towards to the desired boundaries without …
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A GEOMETRIC VARIATIONAL APPROACH TO SHAPE INVERSION FOR RADAR
In this thesis, we develop a novel method for dense shape reconstruction of scenes using radar. For a given scene and antennas taking measurements from the scene, our method iteratively estimates the scene shape using the measurements. To this end, we use a deformable shape evolution approach which …