Download or read book Collected Papers on Coded Aperture Imaging written by Edward E. Fenimore and published by . This book was released on 1990* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coded Aperture Imaging written by R. G. Simpson and published by . This book was released on 1979* with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coded Aperture Imaging written by Matthew Selwood and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CODED APERTURE IMAGING DIGITAL DECODING AND TOMOGRAPHIC ARTIFACTS written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coded Aperture Imaging written by Manuel Martinello and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis studies the coded aperture camera, a device consisting of a conventional camera with a modified aperture mask, that enables the recovery of both depth map and all-in-focus image from a single 2D input image. Key contributions of this work are the modeling of the statistics of natural images and the design of efficient blur identification methods in a Bayesian framework. Two cases are distinguished: 1) when the aperture can be decomposed in a small set of identical holes, and 2) when the aperture has a more general configuration. In the first case, the formulation of the problem incorporates priors about the statistical variation of the texture to avoid ambiguities in the solution. This allows to bypass the recovery of the sharp image and concentrate only on estimating depth. In the second case, the depth reconstruction is addressed via convolutions with a bank of linear filters. Key advantages over competing methods are the higher numerical stability and the ability to deal with large blur. The all-in-focus image can then be recovered by using a deconvolution step with the estimated depth map. Furthermore, for the purpose of depth estimation alone, the proposed algorithm does not require information about the mask in use. The comparison with existing algorithms in the literature shows that the proposed methods achieve state-of-the-art performance. This solution is also extended for the first time to images affected by both defocus and motion blur and, finally, to video sequences with moving and deformable objects.
Download or read book Application of the CLEAN Algorithm to Three Dimensional Coded Aperture Imaging written by Kevin Byard and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coded Aperture Imaging Application in One sided Imaging of Visually Obscured Objects written by William Scott and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical properties of visible light and its interaction with matter create obstructions the human eye cannot explore. High energy radiation has been used as an alternative to visible light to penetrate these concealed regions and reveal their contents. However, traditional imaging techniques require a two-sided apparatus with a radiation source and a detector on opposite sides of the concealed object. One-sided imaging of concealed objects is made possible by a technique called backscatter imaging, utilizing high energy radiation. However, the signal produced by backscatter imaging is inherently weak, which makes in- terpretation di cult. One of the most promising techniques for recovering the weak signal is the coding and decoding provided by Coded Aperture Imaging (CAI). The purpose of this study was to create and test a coded aperture imaging system using backscattered x-rays. This would enable one-sided imaging of concealed objects and demonstrate whether a portable imaging system was feasible. The results obtained from conducting a computer simulation, visi- ble light experiments, and x-ray experiments proved that the process works, however, the x-ray ux levels required were too high for a portable system, based upon the current equipment available at UOIT.
Download or read book Coded Aperture Imaging for Fast Neautron Activation Analysis written by Li Zhang and published by . This book was released on 1996 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hadamard Transform Optics written by Martin Harwit and published by . This book was released on 1979 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Depth From Defocus A Real Aperture Imaging Approach written by Subhasis Chaudhuri and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Depth recovery is important in machine vision applications when a 3-dimensional structure must be derived from 2-dimensional images. This is an active area of research with applications ranging from industrial robotics to military imaging. This book provides the comprehensive details of the methodology, along with the complete mathematics and algorithms involved. Many new models, both deterministic and statistical, are introduced.
Download or read book The application of parallel processing techniques in coded aperture imaging written by Stephen Howard Duncan and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coded Aperture Imaging with a HURA Coded Aperture and a Discrete Pixel Detector written by Kevin Byard and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase Coded Aperture for Extended Depth of Field Imaging and Depth Measurement Capabilities from a Single Image written by Harel Haim and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Use of Annular Coded Aperture in Nuclear Imaging written by Samita S. Athawale and published by . This book was released on 2010 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The benefit of a medical imaging examination in terms of its ability to yield an accurate diagnosis depends on the quality of both the image and the image interpretation. During the past half century, nuclear medicine has grown tremendously due to advances in image detector systems and computer technology. However, conventional nuclear imaging systems still suffer from relatively low detection efficiency thereby affecting the spatial resolution of the system. Coded Aperture imaging is a technique that offers improved detection efficiency. This technique is discussed in this thesis. This technique offers improved photon-collection efficiency over the collimator systems commonly used with high-energy radiation and consequently offers the possibility of improved spatial resolution and contrast. The aperture chosen for this study is the annulus, due to its advantages which will be discussed in the later chapters. We also present the image collection and processing technique and finally a comparison of the collimator systems with the annular technique. Qualitative comparisons were made by visually inspecting the images obtained by the two techniques while quantitative comparisons were made by statistically testing their modulation transfer functions for significant differences. Both of the comparisons indicated that the annular technique was successful and gave images with increased spatial resolution and contrast.
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1980 with total page 1268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Digital Holography Applications and Emerging Technologies written by Peter Wai Ming Tsang and published by Frontiers Media SA. This book was released on 2023-07-13 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid growth of computing and display technologies, digital holography (DH) has undergone significant advancement in the past two decades. Contemporary research works have enabled holography, a technology which is originally intended for displaying three-dimensional (3-D) images, to be deployed in numerous scientific, engineering, and bio-medical applications. Notably, digital holography has been incorporated into quite a number of contemporary applications, such as, but limited to holographic cryptography, optical metrology, remote sensing and inspection, and more recently, quantum computing. The success attained with DH so far does not limit its development to its current state-of-the-art, but rather research on holography keeps on expanding, with new ideas and methods keep coming up in a sustainable manner. This Research Topic aims to collect representative works from experts in the field, with the aim of providing an insight on the overall picture on digital holography, as well as reporting existing methodologies and emerging technologies that are likely to have strong impact on future research directions. Participating in the Research Topic, either as authors or readers, also facilitates establishing a platform for researchers to network, and to share their knowledge.
Download or read book Coded Aperture Imaging System for Nuclear Fuel Motion Detection written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A Coded Aperature Imaging System (CAIS) has been developed at Sandia National Laboratories to image the motion of nuclear fuel rods undergoing tests simulating accident conditions within a liquid metal fast breeder reactor. The tests require that the motion of the test fuel be monitored while it is immersed in a liquid sodium coolant precluding the use of normal optical means of imaging. However, using the fission gamma rays emitted by the fuel itself and coded aperture techniques, images with 1.5 mm radial and 5 mm axial resolution have been attained. Using an electro-optical detection system coupled to a high speed motion picture camera a time resolution of one millisecond can be achieved. This paper will discuss the application of coded aperture imaging to the problem, including the design of the one-dimensional Fresnel zone plate apertures used and the special problems arising from the reactor environment and use of high energy gamma ray photons to form the coded image. Also to be discussed will be the reconstruction techniques employed and the effect of various noise sources on system performance. Finally, some experimental results obtained using the system will be presented.
