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Author :
Publisher :
ISBN 13 :
Total Pages : 1 pages
Book Rating : 4.:/5 (552 download)
Download or read book Wavefront Sensing, Imaging, and Image Enhancement written by and published by . This book was released on 2009 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : János Lőbb
Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.:/5 (12 download)
Download or read book Speckle Image Enhancement Using Recorded Shack-Hartmann Wavefront Sensor Data written by János Lőbb and published by . This book was released on 2016 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Even today, when many large telescopes have high performance Adaptive Optics systems, speckle imaging is as important as ever to get useful high-spatial-resolution information about important astronomical objects, particularly in the detection of stellar companions of exoplanet host stars. Any methods that can extend the reach of speckle imaging to objects that are fainter or farther away would be welcome additions to the range of techniques for high-resolution imaging. ¶ In the first part of the thesis I describe a method to do a selection of frames of an image stack from an astronomical observation done by speckle imaging, using specific Rényi entropy as a classification, that is, a decision-making tool. With this automatic selection process the signal-to-noise ratio can be improved between 15-20% in some cases, although no method could consistently provide improvement in all cases. Another implication of the study is that, by using entropy as a criterion, a sub-stack of 10 to 40% of the "best" frames in a speckle stack can often demonstrate a signal-to-noise ratio comparable to a full stack, which could minimize computation time of the reconstructed image, making it feasible to compute at the telescope. ¶ In the second part of the thesis I describe how the data from a Shack-Hartmann sensor, as an a priori information source, can be used to create a better instantaneous Point-Spread-Function (PSF) that can be used to preprocess speckle data, leading to a scientific image with higher S/N and better detection limits for faint companions. This is of some importance in certain science applications of speckle imaging observations, such as the accurate measurement of the radii of exoplanets.
Author : Ulf Schnars
Publisher : Springer
ISBN 13 : 3662446936
Total Pages : 233 pages
Book Rating : 4.6/5 (624 download)
Download or read book Digital Holography and Wavefront Sensing written by Ulf Schnars and published by Springer. This book was released on 2014-09-19 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: This highly practical and self-contained guidebook explains the principles and major applications of digital hologram recording and numerical reconstruction (Digital Holography). A special chapter is designated to digital holographic interferometry with applications in deformation and shape measurement and refractive index determination. Applications in imaging and microscopy are also described. Spcial techniques such as digital light-in-flight holography, holographic endoscopy, information encrypting, comparative holography, and related techniques of speckle metrology are also treated
Author : Stephan Stürwald
Publisher : Apprimus Wissenschaftsverlag
ISBN 13 : 3863593324
Total Pages : 154 pages
Book Rating : 4.8/5 (635 download)
Download or read book Wave Front Sensor Based on Digital Mirror Matrix for Functional written by Stephan Stürwald and published by Apprimus Wissenschaftsverlag. This book was released on 2015-06-08 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: In dieser Arbeit wird die Entwicklung und Charakterisierung eines Wellenfrontmesssystems für Gleitsichtbrillengläser beschrieben. Es ermöglicht eine quantitative Messung der Wellenfront bis zu 65 mm Durchmesser mit einer lateralen Auflösung von besser als die erforderlichen 1mm für die Inline-Qualitätskontrolle in der Produktion. Das realisierte Low-Cost System ist für Wellenfrontsteigungen mit einer sphärischen Abweichung von ± 2 Grad konzipiert und eröffnet eine flexible funktionale Prüfung von optischen Systemen und Freiformoptiken.
Author : Joseph M. Geary
Publisher : SPIE Press
ISBN 13 : 9780819417015
Total Pages : 188 pages
Book Rating : 4.4/5 (17 download)
Download or read book Introduction to Wavefront Sensors written by Joseph M. Geary and published by SPIE Press. This book was released on 1995 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a practical book on wavefront sensing. Emphasis is on principles and techniques, rather than detailed mathematical analysis of such systems. The goal is to provide the reader with a qualitative understanding of wavefront sensor operation.
Author : Michael C. Roggemann
Publisher : CRC Press
ISBN 13 : 1351439316
Total Pages : 320 pages
Book Rating : 4.3/5 (514 download)
Download or read book Imaging Through Turbulence written by Michael C. Roggemann and published by CRC Press. This book was released on 2018-02-06 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Benjamin James Pope
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (923 download)
Download or read book Vision and Revision written by Benjamin James Pope and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gabriel Cristobal
Publisher : John Wiley & Sons
ISBN 13 : 3527635254
Total Pages : 949 pages
Book Rating : 4.5/5 (276 download)
Download or read book Optical and Digital Image Processing written by Gabriel Cristobal and published by John Wiley & Sons. This book was released on 2013-02-12 with total page 949 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, Moore's law has fostered the steady growth of the field of digital image processing, though the computational complexity remains a problem for most of the digital image processing applications. In parallel, the research domain of optical image processing has matured, potentially bypassing the problems digital approaches were suffering and bringing new applications. The advancement of technology calls for applications and knowledge at the intersection of both areas but there is a clear knowledge gap between the digital signal processing and the optical processing communities. This book covers the fundamental basis of the optical and image processing techniques by integrating contributions from both optical and digital research communities to solve current application bottlenecks, and give rise to new applications and solutions. Besides focusing on joint research, it also aims at disseminating the knowledge existing in both domains. Applications covered include image restoration, medical imaging, surveillance, holography, etc... "a very good book that deserves to be on the bookshelf of a serious student or scientist working in these areas." Source: Optics and Photonics News
Author : William J. Wilson
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (79 download)
Download or read book Millimeter-wave Sensor Image Enhancement written by William J. Wilson and published by . This book was released on 1988 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 602 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : Joel Kubby
Publisher : Cambridge University Press
ISBN 13 : 1108757618
Total Pages : 591 pages
Book Rating : 4.1/5 (87 download)
Download or read book Wavefront Shaping for Biomedical Imaging written by Joel Kubby and published by Cambridge University Press. This book was released on 2019-06-20 with total page 591 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about the theory, techniques and applications of wavefront shaping in biomedical imaging using this unique text. With authoritative contributions from researchers who are defining the field, cutting-edge theory is combined with real-world practical examples, experimental data and the latest research trends to provide the first book-level treatment of the subject. It is suitable for both background reading and use in a course, with coverage of essential topics such as adaptive optical microscopy, deep tissue microscopy, time reversal and optical phase conjugation, and tomography. The latest images from the forefront of biomedical imaging are included, and full-colour versions are available in the eBook version. Researchers, practitioners and graduate students in optics, biophotonics, biomedical engineering, and biology who use biomedical imaging tools and are looking to advance their knowledge of the subject will find this an indispensable resource.
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ISBN 13 :
Total Pages : 490 pages
Book Rating : 4.3/5 (91 download)
Download or read book NASA Reference Publication written by and published by . This book was released on 1990 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 : 9781510621152
Total Pages : pages
Book Rating : 4.6/5 (211 download)
Download or read book Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2018 written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 496 pages
Book Rating : 4.3/5 (454 download)
Download or read book Journal of the Optical Society of America written by and published by . This book was released on 1990 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lianhe Li
Publisher : Frontiers Media SA
ISBN 13 : 2889760200
Total Pages : 120 pages
Book Rating : 4.8/5 (897 download)
Download or read book Advances in Terahertz Detection and Imaging written by Lianhe Li and published by Frontiers Media SA. This book was released on 2022-04-28 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vicente Micó
Publisher : Frontiers Media SA
ISBN 13 : 288971523X
Total Pages : 221 pages
Book Rating : 4.8/5 (897 download)
Download or read book Optical Microscopic and Spectroscopic Techniques Targeting Biological Applications written by Vicente Micó and published by Frontiers Media SA. This book was released on 2021-10-22 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John W. Hardy
Publisher : Oxford Optical and Imaging Sci
ISBN 13 : 9780195090192
Total Pages : 452 pages
Book Rating : 4.0/5 (91 download)
Download or read book Adaptive Optics for Astronomical Telescopes written by John W. Hardy and published by Oxford Optical and Imaging Sci. This book was released on 1998 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book by one of the leaders in adaptive optics covers the fundamental theory and then describes in detail how this technology can be applied to large ground-based telescopes to compensate for the effects of atmospheric turbulence. It includes information on basic adaptive optics components and technology, and has chapters devoted to atmospheric turbulence, optical image structure, laser beacons, and overall system design. The chapter on system design is particularly detailed and includes performance estimation and optimization. Combining a clear discussion of physical principles with numerous real-world examples, this book will be a valuable resource for all graduate students and researchers in astronomy and optics.
