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 18 of 18 for “"Image pixels"”.
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Learning image segmentation and hierarchies by learning ultrametric distances
… is a new machine learning method for image segmentation and the development of a new theory for supervised hierarchy learning based on ultrametric distance functions. It is well-known that the connectivity of neural networks in the brain can have a dramatic influence on their …
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A robust digital image watermarking using repetition codes against common attacks
… using repetition code (3, 1) inside the cover image pixels based on Discrete Cosine Transform (DCT) embedding technique. The proposed methods have undergone several simulation attacks tests in order to check up and compare their robustness against various attacks, like salt and pepper, speckle, …
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An amalgamating approach to connectomic reconstruction
The reconstruction of neurons from connectomics image stacks presents a challenging problem in computer vision. The neuronal objects and their shapes, unlike the objects in natural images, vary greatly in shape and size. Recent methods for reconstruction of individual objects like the flood-filling …
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ENHANCEMENT AND RESTORATION OF DUST IMAGES
… on the modeling of dust noise on ordinary images and formulating enhancement and restoration strategies to improve the quality of dusty images using a sequence of image processing steps. Analyses of images acquired in dusty environments show that the images tend to have noise, blur, a small …
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Stereo vision based on compressed feature correlation and graph cut
… Correlation which is originated from Particle Image Velocimetry (PIV). The algorithm uses an image compression scheme that retains pixel values in high-intensity gradient areas while eliminating pixels with little correlation information in smooth surface regions resulting in a highly reduced …
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Object Association Across Multiple Moving Cameras In Planar Scenes
… First, the model of the intensities of image pixels as independent random variables is challenged and it is asserted that useful correlation exists in intensities of spatially proximal pixels. This correlation is exploited to sustain high levels of detection accuracy in the presence of …
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Space/time/frequency methods in adaptive radar
… a Synthetic Aperture Radar field of view are imaged as defocused objects. The SAR stripmap mode is tuned to stationary ground targets and the mismatch between the SAR processing parameters and the target motion parameters causes the energy to spill over to adjacent image pixels, thus hindering …
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Testing the Limits of Hyperspectral Airborne Remote Sensing by Mapping Eelgrass in Elkhorn Slough
… of seagrass density and distribution from aerial imagery can be applied as a tool in resource management and ecosystem health and stability monitoring. This study investigates analytical methods for mapping eelgrass beds in an optically complex shallow, turbid estuary. Hyperspectral imagery (HSI) …
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Advanced Statistical Learning Methods in Image Processing
… collected in a wide range of applications, e.g., ImageNet in natural image processing and Human Connectome Project in computational neuroscience. These big and complex imaging datasets have facilitated a surge of interest in image processing at the interplay of statistics, computer vision, and …
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The application of machine vision to the selective harvest of green asparagus
… and locate harvestable spears of asparagus. An image acquisition vehicle was fabricated to videotape portions of asparagus rows. The difference in reflectance between soil and vegetative material to near infrared light was used to obtain contrasted images of asparagus spears on a soil …
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Automatic Recognition of Buruli Ulcer Images on Smart Handheld Devices
… In this dissertation, a multistage computerized image-analysis system is proposed that can automatically detect BU in multispectral dermoscopic images. The specific contributions of this work focus on the development of techniques for precise lesion segmentation, efficient image sampling for …
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Security systems based on Gaussian integers : Analysis of basic operations and time complexity of secret transformations
… Gaussian integers were studied in the context of image watermarking as well. The significant benefits of the application of Gaussian integers become apparent when they are used with Discrete Logarithm Problem (DLP) based PK algorithms. In order to quantify the complexity of the Gaussian integer …
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Modelling geometric uncertainties in prostate radiotherapy
Image guided radiotherapy (IGRT) presents a range of techniques to enhance thegeometric accuracy of radiotherapy treatment. A full evaluation of such techniques,against increased cost, workload, or unnecessary radiation dose, would require theincorporation of geometric errors into existing methods …
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A domain independent adaptive imaging system for visual inspection
… the scene, or indeed aid in the analysis of the image. The construction of a symbolic description of a scene from a digitised image is a difficult problem. A symbolic interpretation of an image can be viewed as a mapping from the image pixels to an identification of the semantically relevant …
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Shell-Based Geometric Image and Video Inpainting
… thesis is a class of fast inpainting methods (image or video) based on the idea of filling the inpainting domain in successive shells from its boundary inwards. Image pixels (or video voxels) are filled by assigning them a color equal to a weighted average of either their already filled …
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Development of a clustering algorithm for universal color image segmentation
Submitted in fulfillment of the requirements of the degree of Doctorate in Information Technology, Durban University of Technology, Durban, South Africa, 2022.
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Surveyance of the marine environment for beached plastic debris using a novel, hyperspectral shortwave infrared camera on an uncrewed aerial vehicle (UAV)
… ambiguity, resulting from two-dimensional<br/>imagery of materials of unverifiable chemical composition. This thesis investigates the<br/>detection of shoreline plastic litter with the aerial deployment of a specialised, hyperspectral<br/>camera that is sensitive to shortwave infrared (SWIR) …
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THE DEVELOPMENT AND EVALUATION OF TECHNIQUES FOR USE IN MAMMOGRAPHIC SCREENING COMPUTER AIDED DETECTION SYSTEMS
… lesion visible on screening mammography images. These spiculated lesions most often appear as centrally bright objects with semi-defined borders. Furthermore, lesion margins are composed of indicative spiculations or fine tendrils projecting outward from the mass center. The techniques …