Computational Imaging Through Atmospheric Turbulence
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Computational Imaging Through Atmospheric Turbulence
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Author : Stanley H. Chan
language : en
Publisher:
Release Date : 2023-10-30
Computational Imaging Through Atmospheric Turbulence written by Stanley H. Chan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-10-30 with Computers categories.
The goal of this book is to present the basic concepts of turbulence physics while accomplishing the goal of image reconstruction.
Novel Methods In Computational Imaging With Applications In Remote Sensing
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Author :
language : en
Publisher:
Release Date : 2021
Novel Methods In Computational Imaging With Applications In Remote Sensing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Abstract : This dissertation is devoted to novel computational imaging methods with applications in remote sensing. Computational imaging methods are applied to three distinct applications including imaging and detection of buried explosive hazards utilizing array radar, high resolution imaging of satellites in geosynchronous orbit utilizing optical hypertelescope arrays, and characterization of atmospheric turbulence through multi-frame blind deconvolution utilizing conventional optical digital sensors. The first application considered utilizes a radar array employed as a forward looking ground penetrating radar system with applications in explosive hazard detection. A penalized least squares technique with sparsity-inducing regularization is applied to produce imagery, which is consistent with the expectation that objects are sparsely populated but extended with respect to the pixel grid. Additionally, a series of pre-processing steps is demonstrated which result in a greatly reduced data size and computational cost. Demonstrations of the approach are provided using experimental data and results are given in terms of signal to background ratio, image resolution, and relative computation time. The second application involves a sparse-aperture telescope array configured as a hypertelescope with applications in long range imaging. The penalized least squares technique with sparsity-inducing regularization is adapted and applied to this very different imaging modality. A comprehensive study of the algorithm tuning parameters is performed and performance is characterized using the Structure Similarity Metric (SSIM) to maximize image quality. Simulated measurements are used to show that imaging performance achieved using the pro- posed algorithm compares favorably in comparison to conventional Richardson-Lucy deconvolution. The third application involves a multi-frame collection from a conventional digital sensor with the primary objective of characterizing the atmospheric turbulence in the medium of propagation. In this application a joint estimate of the image is obtained along with the Zernike coefficients associated with the atmospheric PSF at each frame, and the Fried parameter r0 of the atmosphere. A pair of constraints are applied to a penalized least squares objective function to enforce the theoretical statistics of the set of PSF estimates as a function of r0. Results of the approach are shown with both simulated and experimental data and demonstrate excellent agreement between the estimated r0 values and the known or measured r0 values respectively.
Imaging Through Turbulence
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Author : Michael C. Roggemann
language : en
Publisher:
Release Date : 1996
Imaging Through Turbulence written by Michael C. Roggemann and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with TECHNOLOGY & ENGINEERING categories.
Orbital Angular Momentum States Of Lig
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Author : Kedar Khare
language : en
Publisher: Advances in Optics, Photonics
Release Date : 2020-12-21
Orbital Angular Momentum States Of Lig written by Kedar Khare and has been published by Advances in Optics, Photonics this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-12-21 with Science categories.
Orbital Angular Momentum States of Light provides an in-depth introduction to modelling of long-range propagation of orbital angular momentum (OAM) modes as well as more general structured light beams through atmospheric turbulence. Starting with angular spectrum method for diffraction and description of structured light states, the book discusses the technical details related to wave propagation through atmospheric turbulence. The review of historical as well as more recent ideas in this topical area, along with computer simulation codes, makes this book a useful reference to researchers and optical engineers interested in developing and testing of free-space applications of OAM states of light. Key Features Includes modelling of long-range propagation using the angular spectrum approach Presents basic description of turbulence propagation using single or multi-phase screen models Provides information on advanced topics such as propagation polarization of singularities through turbulence Provides discussion on the spiral phase quadrature transform and its application for robust beam engineering Includes accompanying open-source software code snippets for modelling the propagation of scalar and vector beams through turbulence
Correlation Techniques For Imaging Through Atmospheric Turbulence
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Author : Geoffrey Robert Ayers
language : en
Publisher:
Release Date : 1989
Correlation Techniques For Imaging Through Atmospheric Turbulence written by Geoffrey Robert Ayers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
Imaging Through Atmospheric Turbulence Via Cepstral Averaging
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Author : Herbert William Swan
language : en
Publisher:
Release Date : 1982
Imaging Through Atmospheric Turbulence Via Cepstral Averaging written by Herbert William Swan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Clear air turbulence categories.
Fourier Optics And Computational Imaging
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Author : Kedar Khare
language : en
Publisher: Springer Nature
Release Date : 2023-01-02
Fourier Optics And Computational Imaging written by Kedar Khare and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-01-02 with Technology & Engineering categories.
The book is designed to serve as a textbook for advanced undergraduate and graduate students enrolled in physics and electronics and communication engineering and mathematics. The book provides an introduction to Fourier optics in light of new developments in the area of computational imaging over the last couple of decades. There is an in-depth discussion of mathematical methods such as Fourier analysis, linear systems theory, random processes, and optimization-based image reconstruction techniques. These techniques are very much essential for a better understanding of the working of computational imaging systems. It discusses topics in Fourier optics, e.g., diffraction phenomena, coherent and incoherent imaging systems, and some aspects of coherence theory. These concepts are then used to describe several system ideas that combine optical hardware design and image reconstruction algorithms, such as digital holography, iterative phase retrieval, super-resolution imaging, point spread function engineering for enhanced depth-of-focus, projection-based imaging, single-pixel or ghost imaging, etc. The topics covered in this book can provide an elementary introduction to the exciting area of computational imaging for students who may wish to work with imaging systems in their future careers.
Superresolution Imaging Through Atmospheric Turbulence
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Author : David Roderick Gerwe
language : en
Publisher:
Release Date : 1998
Superresolution Imaging Through Atmospheric Turbulence written by David Roderick Gerwe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
The angular resolution of an imaging system is ultimately limited by diffraction effects related to the size of the image pupil once imperfections such as aberrations in the optical surfaces, grainy film, and noisy electronics have been eliminated. However, because of scatterings by turbulence, aerosols, and other inhomogeneities, the atmosphere diminishes the spatial coherence of propagating radiation and reduces the achievable resolution. Improving our ability to see through the atmosphere is of unmeasurable usefulness in astronomy, satellite imaging, remote detection, and all other areas in which high-resolution is desirable.
Imaging Through Turbulence
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Author : Michael C. Roggemann
language : en
Publisher: CRC Press
Release Date : 2018-02-06
Imaging Through Turbulence written by Michael C. Roggemann and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-06 with Technology & Engineering categories.
Learn how to overcome resolution limitations caused by atmospheric turbulence in Imaging Through Turbulence. This hands-on book thoroughly discusses the nature of turbulence effects on optical imaging systems, techniques used to overcome these effects, performance analysis methods, and representative examples of performance. Neatly pulling together widely scattered material, it covers Fourier and statistical optics, turbulence effects on imaging systems, simulation of turbulence effects and correction techniques, speckle imaging, adaptive optics, and hybrid imaging. Imaging Through Turbulence is written in tutorial style, logically guiding you through these essential topics. It helps you bring down to earth the complexities of coping with turbulence.
Computations In Imaging And Related Problems
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Author :
language : en
Publisher:
Release Date : 1997
Computations In Imaging And Related Problems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
The interaction of atmospheric turbulence with light rays leads to serious degradations to images taken through the atmosphere. This research project was concerned with the development of rigorous mathematical models, computational algorithms and high performance computer implementations, in the optical imaging areas of adaptive-optics computations and image post-processing by reconstruction and other enhancement techniques. The work has applications in defense, including the airborne laser weapons program, and to civilian technology, including astronomical, commercial, and medical imaging. An Air Force IBM SP2 supercomputer with 576 nodes was used for parallel algorithm software development. Activities over the period of the grant included three trips each year to Phillips Air Force Laboratory (PLK), including visits to the associated Starfire Optical Range. Eighteen papers were completed and twenty-eight presentations made. Close collaboration was held with researchers at PLK. Much of the motivation for this work came from interactions with Dr. Brent Ellerbroek at the Starfire Optical Range.