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 23 for “"active contour"”.
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Spectrogram Track Detection: An Active Contour Algorithm
… feature detector is integrated into a novel active contour track detection algorithm, and this serves to greatly increase detection rates at low signal-to-noise ratios. Furthermore, the algorithm integrates a priori knowledge of the harmonic process, which describes the relative positions of …
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Efficient Lateral Lane Position Sensing using Active Contour Modeling
… where a novel approach to image segmentation and active contour modeling is performed. Another novel approach presented is the use of velocity as an input from a source outside the algorithm into the process to predict the initial conditions of the model in the next frame, rather than using the …
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Improving the precision of leg ulcer area measurement with active contour models.
… reduce the incidence of such errors by using an active contour model to improve the delineation. Four different models are developed by adapting and applying several contributions made to the active contour model paradigm. Novel features include an external force that acts normally, but not …
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Determination of Aortic Elasticity from MR- and CT- Images Using an Automatic Active Contour Model
The possibility to monitor changes in aortic elasticity in humans has important applications for clinical trials predicting arterial diseases before they become morphologically apparent. The elasticity is usually quantified by compliance measurements. Therefore, the relative temporal change in …
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Towards automatic modeling of buildings in informal settlements from aerial photographs using deformable active contour models (snakes)
This dissertation presents a novel system for semi-automatic modeling of buildings in informal settlement areas from aerial photographs. The building extraction strategy is developed and implememed with the aim of generatinga a desk top Informal Settlement Geographic lnformation System (ISGIS) …
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Automatisches Segmentieren von Mikroarraybildern
… pipelines, as it is usually performed using interactive computer programs. Apart from practical concerns, automation of microarray gridding and feature segmentation is most important to achieve constant data quality, which is a precondition to the integration of different expression data sets. …
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Nonparametric statistical methods for image segmentation and shape analysis
… Recently, image segmentation techniques based on active contour models with level set implementation have received considerable attention. The objective of this thesis is in the development of advanced active contour-based image segmentation methods that incorporate complex statistical information …
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Contour Extraction of Drosophila Embryos Using Active Contours in Scale Space
<p>Contour extraction of Drosophila embryos is an important step to build a computational system for pattern matching of embryonic images which aids in the discovery of genes. Automatic contour extraction of embryos is challenging due to several image variations such as size, shape, orientation and …
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Development of computer-based algorithms for unsupervised assessment of radiotherapy contouring
… control probability and impact clinical outcome. Contouring assessments are performed to ensure high quality of target volume definition in clinical trials but this can be subjective and labour-intensive. This project addresses the hypothesis that computational segmentation techniques, with a …
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A shape-based approach for image retrieval in healthcare information infrastructure
… of region-based Local Binary Fitting (LBF) active contour, Density histogram of Feature Points (DFP) shape representation and k-Nearest Neighbor (k-NN) classifier. Then we performed a series of experiments to evaluate the performance of BrainSearch utilizing different retrieval techniques. …
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Advanced numerical methods for image denoising and segmentation
… fourth-order PDE model (the Y-K model), and the active contour model in image segmentation. Based on the analysis of behaviours of each model, some improvements are proposed. First, a new coefficient is provided for the P-M model to obtain a well-posed model and reduce the “block effect”. Second, …
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Hybrid geometry representations with applications in medical imaging and model repair
… In the first part of the thesis, we examine active contour models (curves as well as surfaces) which frequently are employed in medical imaging for segmentation, pattern matching and object recognition. Here, the principal challenge is to incorporate a priori knowledge about the topology of …
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A 3D Framework for the Musculoskeletal Segmentation of Magnetic Resonance Images
… with some popular MRI segmentation methods like active contour, watershed, FCM and also some heuristic methods, which are proposed in literature for segmenting the MRI to four tissues, demonstrates the superiority of the proposed method especially on the edges.
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Image and video analysis techniques for cellular microscopy
… address these challenges. We propose a level set active contour approach to address accurate segmentation in phase-contrast as well as brightfield microscopy imaging that utilizes edge profiles. Our approach significantly outperforms traditional level set approaches. We show the applications of …
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Kontūro atpažinimo metodų taikymas skersinei chromatinei aberacijai šalinti akies dugno vaizduose ir kelio dangos defektams atpažinti /
… in the context of image analysis and processing, contour recognition methods are investigated for solving the problem of road surface defect recognition and lateral chromatic aberration in eye fundus images. The recognition of object contours in raster images is relevant in many practical fields: …
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Segmentation of cell structures in fluorescence confocal microscopy images
… Based on some background investigations, the active contour methodology has been selected as the fundamental method for image segmentation. This thesis presents the methods used and reports on the results achieved for cell and nuclei segmentation using the hybrid level-set method and cell …
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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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A study of tool wear measurement by using image processing system
… tool wear measurement technology by using the active contour model based image processing method for the flank wear measurement. A MATLAB program is developed to verify the suggested image processing algorithm. Many cutting experiments were conducted with different tools on a CNC machine tool. …
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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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Segmentierung und Analyse anatomischer Strukturen mit wissensbasierten Modellen
… from a set of training datasets with an enhanced active contour model. Additionally, significant features on the objects surface can be defined with high accuracy. The model is fully automatic adjusted to the relevant anatomical structures using scale space methods combined with statistical …
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