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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. -
Qt6hb7321d.Pdf
UC Berkeley UC Berkeley Previously Published Works Title Recovering stereo vision by squashing virtual bugs in a virtual reality environment. Permalink https://escholarship.org/uc/item/6hb7321d Journal Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 371(1697) ISSN 0962-8436 Authors Vedamurthy, Indu Knill, David C Huang, Samuel J et al. Publication Date 2016-06-01 DOI 10.1098/rstb.2015.0264 Peer reviewed eScholarship.org Powered by the California Digital Library University of California Submitted to Phil. Trans. R. Soc. B - Issue Recovering stereo vision by squashing virtual bugs in a virtual reality environment. For ReviewJournal: Philosophical Only Transactions B Manuscript ID RSTB-2015-0264.R2 Article Type: Research Date Submitted by the Author: n/a Complete List of Authors: Vedamurthy, Indu; University of Rochester, Brain & Cognitive Sciences Knill, David; University of Rochester, Brain & Cognitive Sciences Huang, Sam; University of Rochester, Brain & Cognitive Sciences Yung, Amanda; University of Rochester, Brain & Cognitive Sciences Ding, Jian; University of California, Berkeley, Optometry Kwon, Oh-Sang; Ulsan National Institute of Science and Technology, School of Design & Human Engineering Bavelier, Daphne; University of Geneva, Faculty of Psychology and Education Sciences; University of Rochester, Brain & Cognitive Sciences Levi, Dennis; University of California, Berkeley, Optometry; Issue Code: Click <a href=http://rstb.royalsocietypublishing.org/site/misc/issue- 3DVIS codes.xhtml target=_new>here</a> to find the code for your issue.: Subject: Neuroscience < BIOLOGY Stereopsis, Strabismus, Amblyopia, Virtual Keywords: Reality, Perceptual learning, stereoblindness http://mc.manuscriptcentral.com/issue-ptrsb Page 1 of 29 Submitted to Phil. Trans. R. Soc. B - Issue Phil. -
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. -
Effects on Visibility and Lens Accommodation of Stereoscopic Vision Induced by HMD Parallax Images
Original Paper Forma, 29, S65–S70, 2014 Effects on Visibility and Lens Accommodation of Stereoscopic Vision Induced by HMD Parallax Images Akira Hasegawa1,2∗, Satoshi Hasegawa3, Masako Omori4, Hiroki Takada5,Tomoyuki Watanabe6 and Masaru Miyao1 1Graduate School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan 2Library Information Center, Nagoya Bunri University, 365 Maeda, Inazawa-cho, Inazawa 492-8520, Japan 3Department of Information and Media Studies, Nagoya Bunri University, 365 Maeda, Inazawa-cho, Inazawa 492-8520, Japan 4Faculty of Home Economics, Kobe Women’s University, Suma-ku, Kobe 654-8585, Japan 5Department of Human and Artificial Intelligent Systems, Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan 6Department of Nutritional Science, Faculty of Psychological and Physical Science, Aichi Gakuin University, Nisshin 470-0195, Japan ∗E-mail address: [email protected] (Received October 31, 2010; Accepted April 22, 2011) The visual function of lens accommodation was measured while subjects used stereoscopic vision with a head mounted display (HMD). Eyesight while viewing stereoscopic Landolt ring images displayed on HMD was also studied. Accommodation to virtual objects was seen when subjects viewed stereoscopic images of 3D computer graphics, but not when the images were displayed without appropriate binocular parallax. This suggests that stereoscopic moving images on HMD induced visual accommodation. Accommodation should be adjusted to the position of virtual stereoscopic images induced by parallax. A difference in the distances of the focused display and stereoscopic image may cause visual load. However, an experiment showed that Landolt rings of almost the same size were distinguished regardless of virtual distance of 3D images if the parallax was not larger than the fusional upper limit. -
What Is Wrong with the No-Report Paradigm and How to Fix It Ned Block New York University Correspondence: [email protected]
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by PhilPapers Forthcoming in Trends in Cognitive Sciences What is wrong with the no-report paradigm and how to fix it Ned Block New York University Correspondence: [email protected] Key words: consciousness, perception, rivalry, frontal, global workspace, higher order Abstract Is consciousness based in prefrontal circuits involved in cognitive processes like thought, reasoning, and memory or, alternatively, is it based in sensory areas in the back of the neocortex? The no-report paradigm has been crucial to this debate because it aims to separate the neural basis of the cognitive processes underlying post-perceptual decision and report from the neural basis of conscious perception itself. However, the no-report paradigm is problematic because, even in the absence of report, subjects might engage in post-perceptual cognitive processing. Therefore, to isolate the neural basis of consciousness, a no-cognition paradigm is needed. Here, I describe a no-cognition approach to binocular rivalry and outline how this approach can help resolve debates about the neural basis of consciousness. Acknowledgement: Thanks to Jan Brascamp, Susan Carey, Thomas Carlson, David Carmel, David Chalmers, Christof Koch, Hakwan Lau, Matthias Michel, Michael Pitts, Dawid Potgieter and Giulio Tononi for comments on an earlier version. What is the Neural Basis of Consciousness? In recent years the scientific study of consciousness (see Glossary) has focused on finding the neural basis of consciousness in the brain. There are many theories of the neural basis of consciousness, but in broad strokes theories tend to divide on whether consciousness is rooted in the ‘front’ or the ‘back’ of the brain. -
Spacespex™ Anaglyph—The Only Way to Bring 3Dtv to the Masses
SPACESPEX™ ANAGLYPH—THE ONLY WAY TO BRING 3DTV TO THE MASSES By Michael Starks © M. Starks 2009 May be reproduced provided nothing is added, omitted or changed-- including this copyright notice. SpaceSpex™ is the name I applied to my versions of the orange/blue anaglyph technique in 1993. In fact the Gang Li/ColorCode and some models of SpaceSpex use amber or orange/brown rather than yellow, but they are on a continuum. Like all the bicolor anaglyph methods it is compatible with all video equipment and displays and I think it’s the best of the methods using inexpensive paper glasses with colored lenses. Until someone comes up with a way to put hundreds of millions of new 3D TV’s in homes which can use polarized glasses or LCD shutter glasses, anaglyph is going to be the only way for mass distribution of full color high quality 3D over cable, satellite, the web or on DVD. However the solution I have proposed for Set Top Boxes, PC’s, TV sets and DVD players for the last 20 years is to have user controls, so those with display hardware that permits polarized or shutter glasses or even autostereo viewing or who want 2D can make that choice from the single 3D video file. This is the method of the TDVision codec, Next3D, and of Peter Wimmer’s famous StereoScopic Player (a new version due end of 2009), (all of which should appear in hardware soon) and probably the best stereoplayer of all in Masuji Suto’s StereoMovie Maker, and is being incorporated in most well known software DVD and media players. -
Daily Mixed Visual Experience That Prevents Amblyopia in Cats Does Not Always Allow the Development of Good Binocular Depth Perception
Journal of Vision (2009) 9(5):22, 1–7 http://journalofvision.org/9/5/22/ 1 Daily mixed visual experience that prevents amblyopia in cats does not always allow the development of good binocular depth perception Department of Psychology, Dalhousie University, Donald E. Mitchell Halifax, NS, Canada Department of Psychology, Dalhousie University, Jan Kennie Halifax, NS, Canada WT Centre for Neuroimaging, UCL Institute of Neurology, D. Samuel Schwarzkopf London, UK School of Biosciences, Cardiff University, Frank Sengpiel Cardiff, Wales, UK Kittens reared with mixed daily visual input that consists of episodes of normal (binocular) exposure followed by abnormal (monocular) exposure can develop normal visual acuity in both eyes if the length of the former exposure exceeds a critical amount. However, later studies of the tuning of cells in primary visual cortex of animals reared in this manner revealed that their responses to interocular differences in phase were not reliable suggesting that their binocular depth perception may not be normal. We examined this possibility in 3 kittens reared with mixed daily visual exposure (2 hrs binocular vision followed by 5 hrs monocular exposure) that allowed development of normal visual acuity in both eyes. Measurements made of the threshold differences in depth that could be perceived under monocular and binocular viewing revealed a 10-fold superiority of binocular over monocular depth thresholds in one animal while the depth thresholds of the other two animals were poor and there was no binocular superiority. Thus, there was evidence that only one animal possessed stereopsis while the other two were likely stereoblind. While 2 hrs of daily binocular vision protected against the development of amblyopia, the poor outcome with respect to stereopsis points to the need for additional measures to promote binocular vision. -
Stereopsis and Stereoblindness
Exp. Brain Res. 10, 380-388 (1970) Stereopsis and Stereoblindness WHITMAN RICHARDS Department of Psychology, Massachusetts Institute of Technology, Cambridge (USA) Received December 20, 1969 Summary. Psychophysical tests reveal three classes of wide-field disparity detectors in man, responding respectively to crossed (near), uncrossed (far), and zero disparities. The probability of lacking one of these classes of detectors is about 30% which means that 2.7% of the population possess no wide-field stereopsis in one hemisphere. This small percentage corresponds to the probability of squint among adults, suggesting that fusional mechanisms might be disrupted when stereopsis is absent in one hemisphere. Key Words: Stereopsis -- Squint -- Depth perception -- Visual perception Stereopsis was discovered in 1838, when Wheatstone invented the stereoscope. By presenting separate images to each eye, a three dimensional impression could be obtained from two pictures that differed only in the relative horizontal disparities of the components of the picture. Because the impression of depth from the two combined disparate images is unique and clearly not present when viewing each picture alone, the disparity cue to distance is presumably processed and interpreted by the visual system (Ogle, 1962). This conjecture by the psychophysicists has received recent support from microelectrode recordings, which show that a sizeable portion of the binocular units in the visual cortex of the cat are sensitive to horizontal disparities (Barlow et al., 1967; Pettigrew et al., 1968a). Thus, as expected, there in fact appears to be a physiological basis for stereopsis that involves the analysis of spatially disparate retinal signals from each eye. Without such an analysing mechanism, man would be unable to detect horizontal binocular disparities and would be "stereoblind". -
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. -
Visible Binocular Beats from Invisible Monocular Stimuli During Binocular Rivalry Thomas A
Brief Communication 1055 Visible binocular beats from invisible monocular stimuli during binocular rivalry Thomas A. Carlson and Sheng He When two qualitatively different stimuli are presented in rivalry [14–16]. Random dot stereograms can be seen at the same time, one to each eye, the stimuli can either superimposed on, but not interacting with two orthogonal integrate or compete with each other. When they gratings engaged in rivalry, a phenomenon that Wolfe compete, one of the two stimuli is alternately termed ‘trinocular vision’ [5]. Hastorf and Myro also suppressed, a phenomenon called binocular rivalry reported that form and color rivalry could be de-coupled [1,2]. When they integrate, observers see some form of from one another ([17]; and see [5,18] for a general review). the combined stimuli. Many different properties (for Nevertheless, there are also challenges to the coexistence example, shape or color) of the two stimuli can induce of stereopsis and rivalry, particularly for the claim that they binocular rivalry. Not all differences result in rivalry, can be perceived at the same spatial location [6,7]. however. Visual ‘beats’, for example, are the result of integration of high-frequency flicker between the two During the experiment, an observer’s left eye was pre- eyes [3,4], and are thus a binocular fusion phenomenon. sented with a red triangle facing left and the right eye a It remains in dispute whether binocular fusion and green triangle facing right (each side of the triangle rivalry can co-exist with one another [5–7]. Here, we extended 2.1° visual angle), and each was illuminated, report that rivalry and beats, two apparently opposing respectively, with red or green light-emitting diodes (LEDs) phenomena, can be perceived at the same time within from behind a plastic diffuser. -
Visualization and Visual System Affect Spatial Performance in Augmented
Journal of Vision (2021) 21(8):17, 1–18 1 When virtual and real worlds coexist: Visualization and visual system affect spatial performance in augmented reality Department of Optometry and Vision Science, Faculty of Physics, Mathematics and Optometry, Tatjana Pladere University of Latvia, Riga, Latvia Department of Optometry and Vision Science, Faculty of Physics, Mathematics and Optometry, University of Latvia, Riga, Latvia Laboratory of Statistical Research and Data Analysis, Faculty of Physics, Mathematics and Optometry, Artis Luguzis University of Latvia, Riga, Latvia Roberts Zabels LightSpace Technologies, Marupe, Latvia Rendijs Smukulis LightSpace Technologies, Marupe, Latvia Department of Optometry and Vision Science, Faculty of Physics, Mathematics and Optometry, Viktorija Barkovska University of Latvia, Riga, Latvia Department of Optometry and Vision Science, Faculty of Physics, Mathematics and Optometry, Linda Krauze University of Latvia, Riga, Latvia Department of Optometry and Vision Science, Faculty of Physics, Mathematics and Optometry, Vita Konosonoka University of Latvia, Riga, Latvia Department of Optometry and Vision Science, Faculty of Physics, Mathematics and Optometry, Aiga Svede University of Latvia, Riga, Latvia Department of Optometry and Vision Science, Faculty of Physics, Mathematics and Optometry, Gunta Krumina University of Latvia, Riga, Latvia New visualization approaches are being actively environment of augmented reality using a developed aiming to mitigate the effect of head-mounted display that was driven in multifocal and vergence-accommodation conflict in stereoscopic single focal plane modes. Participants matched the augmented reality; however, high interindividual distance of a real object with images projected at three variability in spatial performance makes it difficult to viewing distances, concordant with the display focal predict user gain. -
Optimal Allocation of Quantized Human Eye Depth Perception for Light Field Display Design
Optimal Allocation of Quantized Human Eye Depth Perception for Light Field Display Design Alireza Aghasi,∗ Barmak Heshmat,† Leihao Wei,‡ Moqian Tian,§ Steven A. Cholewiak¶ October 14, 2020 Abstract Creating immersive 3D stereoscopic, autostereoscopic, and lightfield experiences are becoming the center point of optical design of future head mounted displays and lightfield displays. However, despite the advancement in 3D and light field displays; there is no consensus on what are the necessary quantized depth levels for such emerging displays at stereoscopic or monocular modalities. Here we start from psychophysical theories and work toward defining and prioritizing quantized levels of depth that would saturate the human depth perception. We propose a general optimization framework, which locates the depth levels in a globally optimal way for band limited displays. While the original problem is computationally intractable, we manage to find a tractable reformulation as maximally covering a region of interest with a selection of hypographs corresponding to the monocular depth of field profiles. The results show that on average 1731 stereoscopic and 8 monocular depth levels (distributed from 25 cm to infinity) would saturate the visual depth perception. Also the first 3 depth levels should be allocated at (148), then (83, 170), then (53, 90, 170) distances respectively from the face plane to minimize the monocular error in the entire population. The study further discusses the 3D spatial profile of the quantized stereoscopic and monocular depth levels. The study provides fundamental guidelines for designing optimal near eye displays, light-field monitors, and 3D screens. 1 Introduction There has been a lot of traction toward more immersive lightfield and autostereoscopic experiences due arXiv:2010.06382v1 [eess.IV] 11 Oct 2020 to advancement in electronics and micro fabrications.