Neural Holography with Camera-In-The-Loop Training
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Comparison Between Digital Fresnel Holography and Digital Image-Plane Holography: the Role of the Imaging Aperture M
Comparison between Digital Fresnel Holography and Digital Image-Plane Holography: The Role of the Imaging Aperture M. Karray, Pierre Slangen, Pascal Picart To cite this version: M. Karray, Pierre Slangen, Pascal Picart. Comparison between Digital Fresnel Holography and Digital Image-Plane Holography: The Role of the Imaging Aperture. Experimental Mechanics, Society for Experimental Mechanics, 2012, 52 (9), pp.1275-1286. 10.1007/s11340-012-9604-6. hal-02012133 HAL Id: hal-02012133 https://hal.archives-ouvertes.fr/hal-02012133 Submitted on 26 Feb 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Comparison between Digital Fresnel Holography and Digital Image-Plane Holography: The Role of the Imaging Aperture M. Karray & P. Slangen & P. Picart Abstract Optical techniques are now broadly used in the experimental analysis. Particularly, a theoretical analysis field of experimental mechanics. The main advantages are of the influence of the aperture and lens in the case of they are non intrusive and no contact. Moreover optical image-plane holography is proposed. Optimal filtering techniques lead to full spatial resolution displacement maps and image recovering conditions are thus established. enabling the computing of mechanical value also in high Experimental results show the appropriateness of the spatial resolution. -
Digital Holography Using a Laser Pointer and Consumer Digital Camera Report Date: June 22Nd, 2004
Digital Holography using a Laser Pointer and Consumer Digital Camera Report date: June 22nd, 2004 by David Garber, M.E. undergraduate, Johns Hopkins University, [email protected] Available online at http://pegasus.me.jhu.edu/~lefd/shc/LPholo/lphindex.htm Acknowledgements Faculty sponsor: Prof. Joseph Katz, [email protected] Project idea and direction: Dr. Edwin Malkiel, [email protected] Digital holography reconstruction: Jian Sheng, [email protected] Abstract The point of this project was to examine the feasibility of low-cost holography. Can viable holograms be recorded using an ordinary diode laser pointer and a consumer digital camera? How much does it cost? What are the major difficulties? I set up an in-line holographic system and recorded both still images and movies using a $600 Fujifilm Finepix S602Z digital camera and a $10 laser pointer by Lazerpro. Reconstruction of the stills shows clearly that successful holograms can be created with a low-cost optical setup. The movies did not reconstruct, due to compression and very low image resolution. Garber 2 Theoretical Background What is a hologram? The Merriam-Webster dictionary defines a hologram as, “a three-dimensional image reproduced from a pattern of interference produced by a split coherent beam of radiation (as a laser).” Holograms can produce a three-dimensional image, but it is more helpful for our purposes to think of a hologram as a photograph that can be refocused at any depth. So while a photograph taken of two people standing far apart would have one in focus and one blurry, a hologram taken of the same scene could be reconstructed to bring either person into focus. -
Stereoscopic Vision, Stereoscope, Selection of Stereo Pair and Its Orientation
International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Impact Factor (2012): 3.358 Stereoscopic Vision, Stereoscope, Selection of Stereo Pair and Its Orientation Sunita Devi Research Associate, Haryana Space Application Centre (HARSAC), Department of Science & Technology, Government of Haryana, CCS HAU Campus, Hisar – 125 004, India , Abstract: Stereoscope is to deflect normally converging lines of sight, so that each eye views a different image. For deriving maximum benefit from photographs they are normally studied stereoscopically. Instruments in use today for three dimensional studies of aerial photographs. If instead of looking at the original scene, we observe photos of that scene taken from two different viewpoints, we can under suitable conditions, obtain a three dimensional impression from the two dimensional photos. This impression may be very similar to the impression given by the original scene, but in practice this is rarely so. A pair of photograph taken from two cameras station but covering some common area constitutes and stereoscopic pair which when viewed in a certain manner gives an impression as if a three dimensional model of the common area is being seen. Keywords: Remote Sensing (RS), Aerial Photograph, Pocket or Lens Stereoscope, Mirror Stereoscope. Stereopair, Stere. pair’s orientation 1. Introduction characteristics. Two eyes must see two images, which are only slightly different in angle of view, orientation, colour, A stereoscope is a device for viewing a stereoscopic pair of brightness, shape and size. (Figure: 1) Human eyes, fixed on separate images, depicting left-eye and right-eye views of same object provide two points of observation which are the same scene, as a single three-dimensional image. -
Scalable Multi-View Stereo Camera Array for Real World Real-Time Image Capture and Three-Dimensional Displays
Scalable Multi-view Stereo Camera Array for Real World Real-Time Image Capture and Three-Dimensional Displays Samuel L. Hill B.S. Imaging and Photographic Technology Rochester Institute of Technology, 2000 M.S. Optical Sciences University of Arizona, 2002 Submitted to the Program in Media Arts and Sciences, School of Architecture and Planning in Partial Fulfillment of the Requirements for the Degree of Master of Science in Media Arts and Sciences at the Massachusetts Institute of Technology June 2004 © 2004 Massachusetts Institute of Technology. All Rights Reserved. Signature of Author:<_- Samuel L. Hill Program irlg edia Arts and Sciences May 2004 Certified by: / Dr. V. Michael Bove Jr. Principal Research Scientist Program in Media Arts and Sciences ZA Thesis Supervisor Accepted by: Andrew Lippman Chairperson Department Committee on Graduate Students MASSACHUSETTS INSTITUTE OF TECHNOLOGY Program in Media Arts and Sciences JUN 172 ROTCH LIBRARIES Scalable Multi-view Stereo Camera Array for Real World Real-Time Image Capture and Three-Dimensional Displays Samuel L. Hill Submitted to the Program in Media Arts and Sciences School of Architecture and Planning on May 7, 2004 in Partial Fulfillment of the Requirements for the Degree of Master of Science in Media Arts and Sciences Abstract The number of three-dimensional displays available is escalating and yet the capturing devices for multiple view content are focused on either single camera precision rigs that are limited to stationary objects or the use of synthetically created animations. In this work we will use the existence of inexpensive digital CMOS cameras to explore a multi- image capture paradigm and the gathering of real world real-time data of active and static scenes. -
Scanning Camera for Continuous-Wave Acoustic Holography
Scanning Camera for Continuous-Wave Acoustic Holography Hillary W. Gao, Kimberly I. Mishra, Annemarie Winters, Sidney Wolin, and David G. Griera) Department of Physics and Center for Soft Matter Research, New York University, New York, NY 10003, USA (Dated: 7 August 2018) 1 We present a system for measuring the amplitude and phase profiles of the pressure 2 field of a harmonic acoustic wave with the goal of reconstructing the volumetric sound 3 field. Unlike optical holograms that cannot be reconstructed exactly because of the 4 inverse problem, acoustic holograms are completely specified in the recording plane. 5 We demonstrate volumetric reconstructions of simple arrangements of objects using 6 the Rayleigh-Sommerfeld diffraction integral, and introduce a technique to analyze 7 the dynamic properties of insonated objects. a)[email protected] 1 Scanning Holographic Camera 8 Most technologies for acoustic imaging use the temporal and spectral characteristics of 1 9 acoustic pulses to map interfaces between distinct phases. This is the basis for sonar , and 2 10 medical and industrial ultrasonography . Imaging continuous-wave sound fields is useful for 3 11 industrial and environmental noise analysis, particularly for source localization . Substan- 12 tially less attention has been paid to visualizing the amplitude and phase profiles of sound 13 fields for their own sakes, with most effort being focused on visualizing the near-field acous- 14 tic radiation emitted by localized sources, a technique known as near-field acoustic holog- 4{6 15 raphy (NAH) . The advent of acoustic manipulation in holographically structured sound 7{11 16 fields creates a need for effective sound-field visualization. -
Algorithms for Single Image Random Dot Stereograms
Displaying 3D Images: Algorithms for Single Image Random Dot Stereograms Harold W. Thimbleby,† Stuart Inglis,‡ and Ian H. Witten§* Abstract This paper describes how to generate a single image which, when viewed in the appropriate way, appears to the brain as a 3D scene. The image is a stereogram composed of seemingly random dots. A new, simple and symmetric algorithm for generating such images from a solid model is given, along with the design parameters and their influence on the display. The algorithm improves on previously-described ones in several ways: it is symmetric and hence free from directional (right-to-left or left-to-right) bias, it corrects a slight distortion in the rendering of depth, it removes hidden parts of surfaces, and it also eliminates a type of artifact that we call an “echo”. Random dot stereograms have one remaining problem: difficulty of initial viewing. If a computer screen rather than paper is used for output, the problem can be ameliorated by shimmering, or time-multiplexing of pixel values. We also describe a simple computational technique for determining what is present in a stereogram so that, if viewing is difficult, one can ascertain what to look for. Keywords: Single image random dot stereograms, SIRDS, autostereograms, stereoscopic pictures, optical illusions † Department of Psychology, University of Stirling, Stirling, Scotland. Phone (+44) 786–467679; fax 786–467641; email [email protected] ‡ Department of Computer Science, University of Waikato, Hamilton, New Zealand. Phone (+64 7) 856–2889; fax 838–4155; email [email protected]. § Department of Computer Science, University of Waikato, Hamilton, New Zealand. -
Stereoscopic Therapy: Fun Or Remedy?
STEREOSCOPIC THERAPY: FUN OR REMEDY? SARA RAPOSO Abstract (INDEPENDENT SCHOLAR , PORTUGAL ) Once the material of playful gatherings, stereoscop ic photographs of cities, the moon, landscapes and fashion scenes are now cherished collectors’ items that keep on inspiring new generations of enthusiasts. Nevertheless, for a stereoblind observer, a stereoscopic photograph will merely be two similar images placed side by side. The perspective created by stereoscop ic fusion can only be experienced by those who have binocular vision, or stereopsis. There are several caus es of a lack of stereopsis. They include eye disorders such as strabismus with double vision. Interestingly, stereoscopy can be used as a therapy for that con dition. This paper approaches this kind of therapy through the exploration of North American collections of stereoscopic charts that were used for diagnosis and training purposes until recently. Keywords. binocular vision; strabismus; amblyopia; ste- reoscopic therapy; optometry. 48 1. Binocular vision and stone (18021875), which “seem to have access to the visual system at the same stereopsis escaped the attention of every philos time and form a unitary visual impres opher and artist” allowed the invention sion. According to the suppression the Vision and the process of forming im of a “simple instrument” (Wheatstone, ory, both similar and dissimilar images ages, is an issue that has challenged 1838): the stereoscope. Using pictures from the two eyes engage in alternat the most curious minds from the time of as a tool for his study (Figure 1) and in ing suppression at a low level of visual Aristotle and Euclid to the present day. -
Digital Refocusing with Incoherent Holography
Digital Refocusing with Incoherent Holography Oliver Cossairt Nathan Matsuda Northwestern University Northwestern University Evanston, IL Evanston, IL [email protected] [email protected] Mohit Gupta Columbia University New York, NY [email protected] Abstract ‘adding’ and ‘subtracting’ blur to the point spread functions (PSF) of different scene points, depending on their depth. In Light field cameras allow us to digitally refocus a pho- a conventional 2D image, while it is possible to add blur to tograph after the time of capture. However, recording a a scene point’s PSF, it is not possible to subtract or remove light field requires either a significant loss in spatial res- blur without introducing artifacts in the image. This is be- olution [10, 20, 9] or a large number of images to be cap- cause 2D imaging is an inherently lossy process; the angular tured [11]. In this paper, we propose incoherent hologra- information in the 4D light field is lost in a 2D image. Thus, phy for digital refocusing without loss of spatial resolution typically, if digital refocusing is desired, 4D light fields are from only 3 captured images. The main idea is to cap- captured. Unfortunately, light field cameras sacrifice spa- ture 2D coherent holograms of the scene instead of the 4D tial resolution in order to capture the angular information. light fields. The key properties of coherent light propagation The loss in resolution can be significant, up to 1-2 orders are that the coherent spread function (hologram of a single of magnitude. While there have been attempts to improve point source) encodes scene depths and has a broadband resolution by using compressive sensing techniques [14], spatial frequency response. -
Design, Assembly, Calibration, and Measurement of an Augmented Reality Haploscope
Design, Assembly, Calibration, and Measurement of an Augmented Reality Haploscope Nate Phillips* Kristen Massey† Mohammed Safayet Arefin‡ J. Edward Swan II§ Mississippi State University Mississippi State University Mississippi State University Mississippi State University Figure 1: The Augmented Reality (AR) haploscope. (a) A front view of the AR haploscope with labeled components [10]. (b) A user participating in perceptual experiments. (c) The user’s view through the haploscope. With finely adjusted parameters such as brightness, binocular parallax, and focal demand, this object appears to have a definite spatial location. ABSTRACT This investment and development is stymied by an incomplete knowledge of key underlying research. Among this unfinished re- A haploscope is an optical system which produces a carefully con- search, our lab has focused on addressing questions of AR percep- trolled virtual image. Since the development of Wheatstone’s origi- tion; in order to accomplish the ambitious goals of business and nal stereoscope in 1838, haploscopes have been used to measure per- industry, a deeper understanding of the perceptual phenomena under- ceptual properties of human stereoscopic vision. This paper presents lying AR is needed [8]. All current commercial AR displays have an augmented reality (AR) haploscope, which allows the viewing certain limitations, including fixed focal distances, limited fields of of virtual objects superimposed against the real world. Our lab has view, non-adjustable optical designs, and limited luminance ranges, used generations of this device to make a careful series of perceptual among others. These limitations hinder the ability of our field to ask measurements of AR phenomena, which have been described in certain research questions, especially in the area of AR perception. -
State-Of-The-Art in Holography and Auto-Stereoscopic Displays
State-of-the-art in holography and auto-stereoscopic displays Daniel Jönsson <Ersätt med egen bild> 2019-05-13 Contents Introduction .................................................................................................................................................. 3 Auto-stereoscopic displays ........................................................................................................................... 5 Two-View Autostereoscopic Displays ....................................................................................................... 5 Multi-view Autostereoscopic Displays ...................................................................................................... 7 Light Field Displays .................................................................................................................................. 10 Market ......................................................................................................................................................... 14 Display panels ......................................................................................................................................... 14 AR ............................................................................................................................................................ 14 Application Fields ........................................................................................................................................ 15 Companies ................................................................................................................................................. -
History Through the Stereoscope: Stereoscopy and Virtual Travel
History through the Stereoscope: Stereoscopy and Virtual Travel By: Lisa Spiro History through the Stereoscope: Stereoscopy and Virtual Travel By: Lisa Spiro Online: < http://cnx.org/content/col10371/1.3/ > CONNEXIONS Rice University, Houston, Texas This selection and arrangement of content as a collection is copyrighted by Lisa Spiro. It is licensed under the Creative Commons Attribution 2.0 license (http://creativecommons.org/licenses/by/2.0/). Collection structure revised: October 30, 2006 PDF generated: October 26, 2012 For copyright and attribution information for the modules contained in this collection, see p. 22. Table of Contents 1 A Brief History of Stereographs and Stereoscopes .............................................1 2 Major US Stereograph Publishers ...............................................................7 3 Egypt through the Stereoscope: Stereography and Virtual Travel ..........................11 4 Strategies and Resources for Studying Stereographs .........................................17 Index ................................................................................................21 Attributions .........................................................................................22 iv Available for free at Connexions <http://cnx.org/content/col10371/1.3> Chapter 1 A Brief History of Stereographs and Stereoscopes1 Stereographs (also know as stereograms, stereoviews and stereocards) present three-dimensional (3D) views of their subjects, enabling armchair tourists to have a you are there experience. The term stereo is derived from the Greek word for solid, so a stereograph is a picture that depicts its subject so that it appears solid. Stereographs feature two photographs or printed images positioned side by side about two and half inches apart, one for the left eye and one for the right. When a viewer uses a stereoscope, a device for viewing stereographs, these two at images are combined into a single image that gives the illusion of depth. -
Full-Color See-Through Three-Dimensional Display Method Based on Volume Holography
sensors Article Full-Color See-Through Three-Dimensional Display Method Based on Volume Holography Taihui Wu 1,2 , Jianshe Ma 2, Chengchen Wang 1,2, Haibei Wang 2 and Ping Su 2,* 1 Department of Precision Instrument, Tsinghua University, Beijing 100084, China; [email protected] (T.W.); [email protected] (C.W.) 2 Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; [email protected] (J.M.); [email protected] (H.W.) * Correspondence: [email protected] Abstract: We propose a full-color see-through three-dimensional (3D) display method based on volume holography. This method is based on real object interference, avoiding the device limitation of spatial light modulator (SLM). The volume holography has a slim and compact structure, which realizes 3D display through one single layer of photopolymer. We analyzed the recording mechanism of volume holographic gratings, diffraction characteristics, and influencing factors of refractive index modulation through Kogelnik’s coupled-wave theory and the monomer diffusion model of photopolymer. We built a multiplexing full-color reflective volume holographic recording optical system and conducted simultaneous exposure experiment. Under the illumination of white light, full-color 3D image can be reconstructed. Experimental results show that the average diffraction efficiency is about 53%, and the grating fringe pitch is less than 0.3 µm. The reconstructed image of volume holography has high diffraction efficiency, high resolution, strong stereo perception, and large observing angle, which provides a technical reference for augmented reality. Citation: Wu, T.; Ma, J.; Wang, C.; Keywords: holographic display; volume holography; photopolymer; augmented reality Wang, H.; Su, P.