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 177 for “"aberration"”.
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Adaptive Aberration Correction for Holographic Projectors
… Freeman designed a method to correct arbitrary aberrations. As ingenious as the method was, the calculations were extensively lengthy. Addressing this issue, a variant of OSPR suited for correcting spatially-varying aberration is presented. The algorithm combines the approaches of Cable, Buckley …
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New Approaches to Aberration Correction in Medical Ultrasound Imaging
… operators may be able to correct for most of the aberration encountered in soft tissues; that increasing aperture should not be viewed merely as a source of aberration, but as an opportunity to more fully correct it; and that the noise penalty for using complete data sets may not be as severe as …
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Clustering Analysis of Zernike Coefficients From High Order Aberration Patients
<p>This thesis focuses on clustering fifteen Zernike coefficients using the method of clustering of linear regression models (CLM). EM algorithm is used to infer the maximum likelihood estimate of parameters for each cluster. Bayesian information criterion (BIC) combined with Bootstrapped maximum …
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Tri-phase emulsions as tunable liquid lenses with aberration correction
… in fluid lens design is the minimization of aberrations that are related to refraction of light at spherical interfaces. These aberrations can in principle be compensated by systematic arrangement of multiple spherical interfaces in succession within a compound lens. Adapting this approch to …
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Application of the Linfoot quality factors to third order spherical aberration
… with a nominal amount of third order spherical aberration is theoretically discussed in this paper. In order to describe the physical status of the image, three criteria Relative Structural Content, Correlation Quality and Image Fidelity defined by Linfoot and another factor called Sharpness are …
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Localized Visual Aberration Detection and Suppression Dataset for UAV Perception Systems
… of the frame where the camera encounters visual aberrations (fog, glare, dust). This thesis presents a large-scale dataset with a variety of scenes in both a simulated and real world indoor environments containing both visual and dynamical sensor data measured in the presence of varying levels of …
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The Role of Chromosome Mutation and Aberration in Species Formation and Differentiation
… The occurrence of chromosome mutations and aberrations, their role in the evolution of new species, and their integration with the process of gene mutation is of much more importance than is often given in many genetics texts.
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Computational optical coherence tomography for polarization-sensitive imaging, aberration correction, and wavefront measurement
… wavefront is often distorted by defocus and aberration, from either the imaging system or the sample itself, leading to poor image quality. Through a careful consideration of the optical theory and imaging hardware, computational imaging methods can correct these distortions through creative …
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Assessment of radial image distortion and spherical aberration on three-dimensional synthetic aperture particle image velocimetry measurements
… effects of radial image distortion and spherical aberration on reconstruction quality of synthetic aperture particle image velocimetry (SAPIV) measurements. A simulated SAPIV system is used to image a synthetic particle volume. An idealized pinhole camera model is used for image formation with …
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Variation in chromosomal aberration induction in differing ATM and ASPM genotypic backgrounds detected via a modified PNA FISH technique
… and qualitative analysis of chromosomal aberration formation. PNA FISH was used to detect a heightened sensitivity in mouse fibroblasts in response to ionizing radiation with Atm-/- and in mouse embryonic fibroblasts (MEFs) in response to loss of Aspm gene respectively. For Atm analysis, …
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Adaptive optics, aberration dynamics and accomodation control. An investigation of the properties of ocular aberrations, and their role in accomodation control.
… to study the dynamic correlation of ocular aberrations; and the application of an adaptive optics (AO) system to investigate the effect of the manipulation of aberrations on the accommodation control. The binocular SH sensor consists of one laser source and one camera to reduce system cost …
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Minimizing electron optical aberrations
"This thesis deals with topics of aberration reduction in high voltage ("""" 100 k V) electron optical instruments, especially used for lithography (SCALPEL) and high resolution electron microscopy (HREM). Since the invention by Berger and Gibson [1) in 1989, SCALPEL (SCattering with Angular …
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Kontūro atpažinimo metodų taikymas skersinei chromatinei aberacijai šalinti akies dugno vaizduose ir kelio dangos defektams atpažinti /
… 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: astronomy, meteorology, forensics, warfare, industry, engineering, medicine, archeology, robotics, and many others. Different …
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