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.
Results
Showing 1 to 20 of 22 for “"Image Alignment"”.
-
Identifying Robust SIFT Features for Improved Image Alignment
… false-positive feature matches and obtain better image alignment results.</p>
-
Image alignment algorithms for ultrasound images with contrast
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
-
An Analysis of Rigid Image Alignment Computer Vision Algorithms
… methods for acquiring, processing, and analyzing images. Image registration is one of the methods used in the computer vision field to transform different sets of data into one coordinate system to align images. Registration is important in order to be able to compare or integrate the data …
-
Spherical mosaic construction using physical analogy for consistent image alignment
… Mosaic techniques are used to obtain images with a large field of view by assembling a sequence of smaller individual overlapping images. In existing methods of mosaic construction only successive images are aligned. Accumulation of small alignment errors occur, and in the case of the …
-
Automatic image alignment for clinical evaluation of patient setup errors in radiotherapy
… The aim of the project is to develop a novel image processing system to enable fast and accurate evaluation of patient setup errors in radiotherapy by automatic detection and alignment of anatomical features in images acquired during treatment simulation and treatment delivery. By combining …
-
Automatic pre-treatment validation in radiotherapy by computer aided 3D-2D image alignment
… three-dimensional (31)) to two-dimensional (2D) image registration methods. The author has proposed two novel methods to register computerised tomography (CT) based volume image data acquired for treatment planning with orthogonal planar images acquired at treatment simulation, which are able to …
-
Image alignment and dynamic graph analytics : two case studies of how managing data movement can make (parallel) code run fast
… two case studies. The first examines large-scale image alignment, where I describe how to align a petabyte scale set of images in memory on a single machine and match the performance of current cluster solutions. I achieve .6 - .8 TB/hr on a medium-sized multicore and linear scalability on …
-
Image Segmentation and Robust Estimation Using Parzen Windows
… explores the use of Parzen windows for modeling image data. The validity of such a model is shown to follow naturally from the elementary Gestalt laws of vicinity, similarity, and continuity of direction. Consistency results are derived for Parzen window estimators, both for continuous-time and …
-
Semi-direct visual SLAM for stereo cameras: system design and validation
… stereo cameras is proposed. It utilizes direct image alignment for camera pose estimation, and indirect methods to optimize poses and landmarks. The system maintains a sparse point cloud map and allows loop closing and relocalization when tracking is lost. Further experiments validate that it …
-
Advances In The Opto-mechanical Design And Alignment Of The Hehsi Imaging Spectrometer Based On A Sagnac Interferometer
The High Efficiency HyperSpectral Imager (HEHSI) is a Fourier Transform hyperspectral imager based on a Sagnac interferometer. This thesis research concentrates on the design upgrade and calibration of HEHSI from a proof of concept instrument to a prototype field instrument. Stability is enhanced …
-
Learning Deformable Templates for Brain MRI
Deformable templates, or atlases, are images, often labelled, that represent a typical anatomy for a population. They are commonly used in medical image analysis for population studies and computational anatomy tasks. Practitioners use image alignment techniques to compare the subject scan and the …
-
Relation among images: Modelling, optimization and applications
… data; and modelling the relation among images is fundamental to success of many of them. Examples include image classification, content-based image retrieval and face recognition. Given signatures of images, there are many ways to depict the relation among them, such as pairwise …
-
Software and hardware improvements for digital solar magnetograph system
… Their high resolution, high rate of image acquisition and convenience for off-line image processing have provided significant improvements to solar physics research. In this project, two digital magnetograph systems established at Big Bear Solar Observatory (BBSO) have been described. …
-
A Novel Multistage Image Registration Technique with Graph-based Region Descriptors
<p>Successful image alignment is an essential function for many image processing methods. The geometric and photometric variations between images adversely affect the ability for an algorithm to estimate the transformation parameters that relate the two images. Local deformations, lightning …
-
Scaling Up and Exploring Marsh (SUEM)
… 3,200 square meters. Annually around 10,000 images were captured of a sampling area. Manually examining of a substantial amount of spatially explicit data is very laborious and resource consuming. The idea is to involve the general public in ecology projects, first train them in identifying …
-
Optimization by Gaussian smoothing with application to geometric alignment
… topic arise from its well-known use in geometric image alignment. The alignment problem can be formulated as an optimization task that minimizes the visual difference between the images by searching the space of transformations. Unfortunately, the cost function associated to this problem usually …
-
Quasi-four-dimensional characterization of dislocation interactions in FCC and HCP systems
… consistent diffraction conditions during image acquisition by using manual digital processing of the micrographs making up a tilt series prior to image alignment and tomographic reconstruction. In the study of stainless steel, it was found that previously determined criteria for slip …
-
2D image classification and alignment in single-particle Cryo-EM
… frozen at unknown, random orientations, and then imaged by transmission electron microscopy to generate a set of two-dimensional (2D) projection images. These generated images are treated as projections of one particle from various directions and used to reconstruct the 3D structure of the …
-
Applications of low-rank matrix recovery methods in computer vision
… availability of high-dimensional data such as images and videos has generated a lot of interest in high-dimensional data analysis. One of the key issues that needs to be addressed in real applications is the presence of large-magnitude non-Gaussian errors. For image data, the problem of …
Page 1 of 2