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 “"region growing"”.
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Segmentation of brain x-ray CT images using seeded region growing
… The segmentation scheme is based on a Seeded Region Growing algorithm. The intracranial volume extraction is based on image symmetry and the noise suppression filter is based on the Gaussian nature of the tissue distribution. Both are essential in achieving good segmentation results. Simulated …
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The Kooshball algorithm--a ray tracing region growing algorithm for medical data
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Vergleich unidimensionaler, bidimensionaler und volumetrischer Messverfahren unter Anwendung eines 64-Zeilen-Mehrschicht-CTs am Beispiel von Bronchialkarzinomen und pulmonalen Metastasen
… WHO-Verfahren und die Volumetrie mittels Region Growing verglichen. 64 selektierte Patienten mit pulmonalen Läsionen erhielten mittels eines 64-Zeilen-Spiralcomputertomographen insgesamt 276 CTs, anhand derer überprüft wurde, inwieweit die Ergebnisse der verschiedenen Ausmessverfahren …
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Intercomparison of medical image segmentation algorithms
… delineate the borders of anatomically distinct regions and possible tumors. Many algorithms have been proposed for image segmentation, the most important being thresholding, region growing, and clustering methods such as k-means and fuzzy c-means algorithms. The main objective of this project …
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Refinement of Automated Forest Area Estimation via Iterative Guided Spectral Class Rejection
… ETM+ images using training data collected via region-growing at 200 random points within each image. The classified images were spatially post-processed using variations on a 3x3 majority filter and a clump and eliminate technique. The accuracy of the images was assessed using the center land …
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Detection of micro-aneurysms in low-resolution color retinal images
… morphological filtering, thresholding, region growing and feature analysis. This algorithm has been tested on retinal images of 640 x 480 resolution. Experimental results show that it is possible to set up parameters to achieve 100% global sensitivity with up to 80% global specificity, …
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Critical Issues in the Processing of cDNA Microarray Images
… segmentation techniques already used, the Seeded Region Growing Algorithm and the Mann-Whitney Test, are examined. We present limitations of these techniques. Finally, we studied the data extraction method used in MicroArray Suite (MS), a microarray analysis software, via synthetic images and …
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On the Determination of Building Footprints from LIDAR Data
… and non-building measurements is performed by growing regions with similar characteristics. These building areas are then refined, resulting in a ground plan representation of building boundaries, known as building footprints. Several algorithms are then implemented to clean these footprints. A …
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Road sign recognition
… images is proposed. We first developed a fast region growing segmentation method, combined with a 1NN smoothing filter, to work on color and produce robust segmentation results even when the image is noisy. An effective color distance measurement is developed to work with the segmentation. We …
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Automatic segmentation of wall structures from cardiac images
… coverages, and image quality. 2. A variational region-growing method is proposed to segment the left atrium from MR images. Because of the localized property of this formulation, the proposed method is insensitive to data variabilities that are hard to handle by globalized methods. 3. In …
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Pedestrian detection and tracking using stereo vision techniques
… via a 3D point clustering process within a region-growing framework. This clustering process avoids using hard thresholds by using bio-metrically inspired constraints and a number of plan view statistics. This pedestrian detection technique requires no external training and is able to …
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Age, Growth, Mortality, and the Effects of Trawling on Mortality of the Longspine Porgy, <i>Stenotomus caprinus</i>
… models. The samples were separated into two regions of the GOM to determine if there was a regional growth difference using likelihood methods. Regional von Bertalanffy length-age growth models displayed significantly different growth parameters with fish in the Central region growing larger …
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Feature extraction via heat flow analogy
… 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 contributions to …
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Studies on neutron diffraction and X-ray radiography for material inspection
… analysis, automated seed point selection, region growing, feature extraction and neural network application are carried out to perform the job. Results show that the performance of the proposed method surpasses existing automated methods utilizing dental X-rays"--Abstract, page iii.
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Preprocessing for content-based image retrieval
… the image, the normalized cut segmentation and region growing segmentation are investigated to segment the object from the background but with limited success. An alternative approach comes from identifying salient regions in the image and extracting local features as a representation of the …
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Image segmentation and pattern classification using support vector machines
… In this dissertation, an automatic Seeded Region Growing (SRG) algorithm for color image segmentation is developed. In the SRG algorithm, the initial seeds are automatically determined. An adaptive morphological edge-linking algorithm to fill in the gaps between edge segments is designed. …
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Cardiac Signals: Remote Measurement and Applications
… lacunarity based micro-textures features and a region growing algorithm to find skin pixels in an image. Our experiment shows that the proposed method is applicable universally to any image including near infra-red images. This finding helps to extend the domain of many application including …
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Integrating spatial and spectral information for automatic feature identification in high -resolution remotely sensed images
… were used to delineate sub-patches. In the region growing step, the similarities of all adjacent subpatches were examined using a multivariate Hotelling T2 test that draws on the classes' covariance matrices. Sub-patches that were not sufficiently dissimilar were merged to form image …
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Image segmentation based on water flow analogy
… is of practical significance in image analysis. Region growing and snakes are the main methods used in the field, but the former cannot yield an exact result whilst the latter has difficulties with topological changes.<br/>This thesis presents a new method, based on the paradigm of water flow. …
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2D and 3D surface image processing algorithms and their applications
… image segmentation problem. A thresholding and region growing combined method is proposed and applied in this application. Based on the filament area detection results, filament disappearances are reported in real time. The solar images in 1999 are processed with this proposed system and three …
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