A Method for the Assessment of the Quality of Stereoscopic 3D Images Raluca Vlad

Total Page:16

File Type:pdf, Size:1020Kb

A Method for the Assessment of the Quality of Stereoscopic 3D Images Raluca Vlad A Method for the Assessment of the Quality of Stereoscopic 3D Images Raluca Vlad To cite this version: Raluca Vlad. A Method for the Assessment of the Quality of Stereoscopic 3D Images. Signal and Image Processing. Université de Grenoble, 2013. English. tel-00925280v2 HAL Id: tel-00925280 https://tel.archives-ouvertes.fr/tel-00925280v2 Submitted on 10 Jan 2014 (v2), last revised 28 Feb 2014 (v3) 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. THÈSE pour obtenir le grade de DOCTEUR DE L’UNIVERSITÉ DE GRENOBLE Spécialité : Signal, Image, Parole, Télécommunications (SIPT) Arrêté ministériel : 7 août 2006 Présentée par Mlle Raluca VLAD Thèse dirigée par Mme Anne GUÉRIN-DUGUÉ et Mme Patricia LADRET préparée au sein du laboratoire Grenoble - Images, Parole, Signal, Automatique (GIPSA-lab) dans l’école doctorale d’Électronique, Électrotechnique, Automatique et Traitement du signal (EEATS) Une méthode pour l’évaluation de la qualité des images 3D stéréoscopiques Thèse soutenue publiquement le 2 décembre 2013, devant le jury composé de : Patrick LE CALLET Professeur, Université de Nantes, Rapporteur Frederic DUFAUX Directeur de recherche, CNRS, Telecom Paris Tech, Rapporteur Pascal MAMASSIAN Directeur de recherche, CNRS, Université Paris Descartes, Examinateur, Président du jury Ingrid HEYNDERICKX Professeur, Technical University of Delft, Examinateur Alain BELLON Ingénieur, STMicroelectronics Grenoble, Examinateur Anne GUÉRIN-DUGUÉ Professeur, Université Joseph Fourier Grenoble, Directeur de thèse Patricia LADRET Maître de conférences, Université Joseph Fourier Grenoble, Encadrant de thèse UNIVERSITY OF GRENOBLE Doctoral school EEATS (Électronique, Électrotechnique, Automatique et Traitement du Signal) THESIS for obtaining the title of Doctor of Science of the University of Grenoble Mention: SIPT (Signal, Image, Parole, Télécommunications) Presented by Ms Raluca VLAD A Method for the Assessment of the Quality of Stereoscopic 3D Images Thesis supervised by Mrs Anne GUÉRIN-DUGUÉ and Mrs Patricia LADRET prepared at Grenoble - Images, Parole, Signal, Automatique Laboratory (GIPSA-lab) presented on December 2, 2013 Jury: Reviewers: Patrick LE CALLET - University of Nantes Frederic DUFAUX - CNRS, Telecom Paris Tech Examiners: Pascal MAMASSIAN - CNRS, Paris Descartes University Ingrid HEYNDERICKX - Technical University of Delft Alain BELLON - STMicroelectronics Grenoble Supervisor: Anne GUÉRIN-DUGUÉ - University Joseph Fourier of Grenoble Co-supervisor: Patricia LADRET - University Joseph Fourier of Grenoble Acknowledgments The three years of my PhD studies have finished (it seems now, so fast) and the most important trace they leave with me is one of extreme human richness, coming from the wonderful persons I have been surrounded by. I am so lucky! I am happy to address now my sincere thanks to Patricia and Anne, an excellent team of PhD supervisors, given their technicality, their precision, their high standards, but most of all, their admirable human qualities and their right words at the right time that have given me the confidence to overcome any challenge. I respectfully thank my PhD committee members (Patrick Le Callet, Frédéric Dufaux, Ingrid Heynderickx, Pascal Mamassian, and Alain Bellon), for their kind appreciations of my work. I particularly thank Alain Bellon of STMicroelectronics for his cordial support, for his very pertinent and detailed observations on my work and for the clear insight he allowed me to gain on the industrial side of my field of work. I must thank Gelu Ionescu and Laurent Ott for their prompt technical help, but also for the cordial discussions that I have often had with each of them. I thank Lucia Bouffard-Tocat and Isabelle Cieren for their precious help in administrative matters. They have made everything so much simpler for me. I would like to thank Jérôme Mars, him being my first contact with GIPSA-lab and the one who believed in me when, back in Romania, I told him once how I would love to work in research related to image processing in France. I owe many, many thanks to Simone and Fakhri. The numerous discussions with them on the subject of my PhD in our office have been so rich and have brought me so many good ideas. I sincerely thank Olha and Matthieu for their contributions to the results presented in this manuscript. They have been both honestly involved in the experimental studies that we carried out together. Olha was very patient and calm when I was not anymore and Matthieu did an excellent job providing proper results in a very efficient way during my third year of PhD, allowing me thus to finish this manuscript correctly on time. A I must thank Damien for his proper and very elegantly organized LTEX template that he A allowed me to use, for all the LTEX discussions (and jokes) he so often has to share, but also for the sincere and thorough help he has offered whenever I needed. I have huge thanks to offer to my colleagues from the DIS department of GIPSA-lab: Arnaud, Aude, Céline, Christophe, Cindy, Emmanuelle, Francesca, Florian, Hao, Hélène, Quentin, Ladan, Jérémie, Jonas, Manu, Rémy, Robin, Rodrigo, Saman, Son, Vincent, Weiyuan (alphabetical order, impossible to do otherwise) and not only. They were all so supportive, so helpful, so kind, so sincere, that I consider them more than colleagues, I consider them my friends. I am so glad to have had the chance to work in such a pleasant environment. I reserve particular thanks to Guanghan and Zhongyang, who have been my special com- i ii panions at GIPSA-lab since the beginning of my PhD and such devoted friends. I have shared with them so many great experiences. I do not forget my friends from Romania either: Andra, Bobi, Cristina, Ioana, Monica. Even if we meet rarely and we sometimes do not get to speak even for months, whenever we do, it feels like we were never apart. I had their warm support when I decided to take the big step of coming to France and great encouragements in all the other steps that followed ever since. I can always count on them and I spend such pleasant moments in their company. Cécile... Her friendship means so much to me. She is the first friend I made in France and definitely the most precious. I have learned so much from her, but most importantly I have learned that no effort is too big when you are doing it for a friend. Cécile, thank you! Vincent... The proud smile on his face when I finished my PhD defense presentation, that was the beautiful final note of all the last months of emotion and hard work, during which he supported me like I did not know it was possible. Long discussions on so many subjects, insight from his experience, confidence, encouragement, sometimes tough (but justified and so helpful) A remarks, typical (and cute) jokes, LTEXor French orthography counseling at any hour, night or day, and so many other huge or very small things are some of the strongest reasons why I declare myself so lucky. Thank you, Vincent! And, last, but most important, I would like to warmly thank my family: parents, grand- parents, cousins, uncles and aunts. I am so thankful to have such a beautiful and loving family. They have supported me enormously in every step I took and what I am is because of them. Thank you all ! Contents Acknowledgments i Introduction 3 I State-of-the-Art 7 1 The Evolution of Stereoscopy 9 1.1 Short history of stereoscopy .............................. 9 1.2 Stereoscopy today ................................... 13 2 The Human Stereoscopic Perception 15 2.1 The main HVS characteristics related to the binocular vision . 15 2.2 Mechanisms of human depth perception ....................... 25 3 The Stereoscopic Systems 31 3.1 Dual-camera geometry ................................. 31 3.2 Dual-camera capture .................................. 33 3.3 3D content compression ................................ 33 3.4 3D data formats .................................... 35 3.5 3D displays ....................................... 36 3.6 3D data rendering ................................... 43 4 The Assessment of the Stereoscopic Quality 49 4.1 Image quality ...................................... 50 4.2 Stereoscopic image quality ............................... 50 4.3 Assessing the stereoscopic image quality ....................... 51 4.4 The depth perceived .................................. 52 4.5 Impairments in the stereoscopic content ....................... 53 4.6 Visual fatigue and visual discomfort ......................... 63 4.7 Stereoscopic image quality assessment methods ................... 66 4.8 Stereoscopic image quality models .......................... 83 4.9 The Image Quality Circle of Engeldrum ....................... 85 iii iv Contents II Our Objectives and Our Approach 89 5 Our Objectives and Our Approach 91 5.1 Our objectives ..................................... 91 5.2 Our approach ...................................... 92 6 Our Stereoscopic System 99 6.1 Capture ......................................... 99 6.2 Image processing ....................................101 6.3 Displays .........................................102
Recommended publications
  • 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.
    [Show full text]
  • 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.
    [Show full text]
  • 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".
    [Show full text]
  • 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.
    [Show full text]
  • Investigating Intermittent Stereoscopy: Its Effects on Perception and Visual Fatigue
    ©2016 Society for Imaging Science and Technology DOI: 10.2352/ISSN.2470-1173.2016.5.SDA-041 INVESTIGATING INTERMITTENT STEREOSCOPY: ITS EFFECTS ON PERCEPTION AND VISUAL FATIGUE Ari A. Bouaniche, Laure Leroy; Laboratoire Paragraphe, Université Paris 8; Saint-Denis; France Abstract distance in virtual environments does not clearly indicate that the In a context in which virtual reality making use of S3D is use of binocular disparity yields a better performance, and a ubiquitous in certain industries, as well as the substantial amount cursory look at the literature concerning the viewing of of literature about the visual fatigue S3D causes, we wondered stereoscopic 3D (henceforth abbreviated S3D) content leaves little whether the presentation of intermittent S3D stimuli would lead to doubt as to some negative consequences on the visual system, at improved depth perception (over monoscopic) while reducing least for a certain part of the population. subjects’ visual asthenopia. In a between-subjects design, 60 While we do not question the utility of S3D and its use in individuals under 40 years old were tested in four different immersive environments in this paper, we aim to position conditions, with head-tracking enabled: two intermittent S3D ourselves from the point of view of user safety: if, for example, the conditions (Stereo @ beginning, Stereo @ end) and two control use of S3D is a given in a company setting, can an implementation conditions (Mono, Stereo). Several optometric variables were of intermittent horizontal disparities aid in depth perception (and measured pre- and post-experiment, and a subjective questionnaire therefore in task completion) while impacting the visual system assessing discomfort was administered.
    [Show full text]
  • 3D Techniques
    3D Techniques Univ.Prof. Dr.-Ing. Markus Rupp LVA 389.141 Fachvertiefung Telekommunikation (LVA: 389.137 Image and Video Compression) Last change: Jan 20, 2020 Outline • Binocluar Vision • Stereo Images: From first approaches to standardisation • 3D TV Univ.-Prof. Dr.-Ing. Markus Rupp 2 So far we did only this… This is an eye-pad not an IPad Binocular vision • Binocular vision is vision in which both eyes are used together. The word binocular comes from two Latin roots, bini for double, and oculus for eye.[1] Having two eyes confers at least four advantages over having one. First, it gives a creature a spare eye in case one is damaged. Second, it gives a wider field of view. For example, humans have a maximum horizontal field of view of approximately 200 degrees with two eyes, approximately 120 degrees of which makes up the binocular field of view (seen by both eyes) flanked by two uniocular fields (seen by only one eye) of approximately 40 degrees. [2] Third, it gives binocular summation in which the ability to detect faint objects is enhanced.[3] Fourth it can give stereopsis in which parallax provided by the two eyes' different positions on the head give precise depth perception.[4] Such binocular vision is usually accompanied by singleness of vision or binocular fusion, in which a single image is seen despite each eye's having its own image of any object.[4] Binocular vision • Some animals, usually prey animals, have their two eyes positioned on opposite sides of their heads to give the widest possible field of view.
    [Show full text]
  • Motion-In-Depth Perception and Prey Capture in the Praying Mantis Sphodromantis Lineola
    © 2019. Published by The Company of Biologists Ltd | Journal of Experimental Biology (2019) 222, jeb198614. doi:10.1242/jeb.198614 RESEARCH ARTICLE Motion-in-depth perception and prey capture in the praying mantis Sphodromantis lineola Vivek Nityananda1,*, Coline Joubier1,2, Jerry Tan1, Ghaith Tarawneh1 and Jenny C. A. Read1 ABSTRACT prey as they come near. Just as with depth perception, several cues Perceiving motion-in-depth is essential to detecting approaching could contribute to the perception of motion-in-depth. or receding objects, predators and prey. This can be achieved Two of the motion-in-depth cues that have received the most using several cues, including binocular stereoscopic cues such attention in humans are binocular: changing disparity and as changing disparity and interocular velocity differences, and interocular velocity differences (IOVDs) (Cormack et al., 2017). monocular cues such as looming. Although these have been Stereoscopic disparity refers to the difference in the position of an studied in detail in humans, only looming responses have been well object as seen by the two eyes. This disparity reflects the distance to characterized in insects and we know nothing about the role of an object. Thus as an object approaches, the disparity between the stereoscopic cues and how they might interact with looming cues. We two views changes. This changing disparity cue suffices to create a used our 3D insect cinema in a series of experiments to investigate perception of motion-in-depth for human observers, even in the the role of the stereoscopic cues mentioned above, as well as absence of other cues (Cumming and Parker, 1994).
    [Show full text]
  • Audiovisual Spatial Congruence, and Applications to 3D Sound and Stereoscopic Video
    Audiovisual spatial congruence, and applications to 3D sound and stereoscopic video. C´edricR. Andr´e Department of Electrical Engineering and Computer Science Faculty of Applied Sciences University of Li`ege,Belgium Thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy (PhD) in Engineering Sciences December 2013 This page intentionally left blank. ©University of Li`ege,Belgium This page intentionally left blank. Abstract While 3D cinema is becoming increasingly established, little effort has fo- cused on the general problem of producing a 3D sound scene spatially coher- ent with the visual content of a stereoscopic-3D (s-3D) movie. The percep- tual relevance of such spatial audiovisual coherence is of significant interest. In this thesis, we investigate the possibility of adding spatially accurate sound rendering to regular s-3D cinema. Our goal is to provide a perceptually matched sound source at the position of every object producing sound in the visual scene. We examine and contribute to the understanding of the usefulness and the feasibility of this combination. By usefulness, we mean that the technology should positively contribute to the experience, and in particular to the storytelling. In order to carry out experiments proving the usefulness, it is necessary to have an appropriate s-3D movie and its corresponding 3D audio soundtrack. We first present the procedure followed to obtain this joint 3D video and audio content from an existing animated s-3D movie, problems encountered, and some of the solutions employed. Second, as s-3D cinema aims at providing the spectator with a strong impression of being part of the movie (sense of presence), we investigate the impact of the spatial rendering quality of the soundtrack on the reported sense of presence.
    [Show full text]
  • Download (6MB)
    This work is protected by copyright and other intellectual property rights and duplication or sale of all or part is not permitted, except that material may be duplicated by you for research, private study, criticism/review or educational purposes. Electronic or print copies are for your own personal, non- commercial use and shall not be passed to any other individual. No quotation may be published without proper acknowledgement. For any other use, or to quote extensively from the work, permission must be obtained from the copyright holder/s. AN INVESTIGATION OF SOME FACTORS AFFECTING THE VARIABILITY OF THE MCCOLLOUGH EFFECT 1 by N.J. Lund, B.Sc., Wales Thesis submitted for the degree of Doctor of Philosophy to the University of Keele Department of Communication and Neuroscience 1982 Dedication: To my parents, John and Cynthia Lund ABSTRACT A series of experiments are reported which have attempted to isolate some factors causing inter and intrasubject variability of the McCollough effect.* A number of such factors were found. 1. The initial strength of the OCCA is strongly influenced by sleep duration. Reduction of up to one third of a normal nights sleep caused a marked decrease in the aftereffect strength. Sleep periods of under a third of normal were found to have no further effect. Decay rates were not affected by prior sleep duration. 2. Both the strength and decay of the McCollough effect undergo diurnal changes late in the evening. These changes were linked with the sleep cycle and evidence is presented indicating that the effect of the time of day upon the initial strength may be linked with the effect of sleep duration.
    [Show full text]
  • Stereoscopic Viewing Enhances Visually Induced Motion Sickness
    Behrang Keshavarz* Stereoscopic Viewing Enhances Heiko Hecht Department of General Visually Induced Motion Sickness Experimental Psychology but Sound Does Not Johannes Gutenberg-University 55099 Mainz, Germany Abstract Optic flow in visual displays or virtual environments often induces motion sickness (MS). We conducted two studies to analyze the effects of stereopsis, background sound, and realism (video vs. simulation) on the severity of MS and related feelings of immersion and vection. In Experiment 1, 79 participants watched either a 15-min-long video clip taken during a real roller coaster ride, or a precise simulation of the same ride. Additionally, half of the participants watched the movie in 2D, and the other half in 3D. MS was measured using the Simulator Sickness Questionnaire (SSQ) and the Fast Motion Sickness Scale (FMS). Results showed a significant interaction for both variables, indicating highest sickness scores for the real roller coaster video presented in 3D, while all other videos provoked less MS and did not differ among one another. In Experiment 2, 69 subjects were exposed to a video captured during a bicycle ride. Viewing mode (3D vs. 2D) and sound (on vs. off) were varied between subjects. Response measures were the same as in Experiment 1. Results showed a significant effect of stereopsis; MS was more severe for 3D presentation. Sound did not have a significant effect. Taken together, stereoscopic viewing played a crucial role in MS in both experiments. Our findings imply that stereoscopic videos can amplify visual dis- comfort and should be handled with care. 1 Introduction Over the past decades, the technological progress in entertainment sys- tems has grown rapidly.
    [Show full text]
  • Proximal Monitoring in Landscape Environments
    Department of Mathematics and Statistics Proximal Monitoring in Landscape Environments Shuqi Ng This dissertation is presented for the Degree of Doctor of Philosophy of Curtin University December 2017 DECLARATION To the best of my knowledge and belief, this thesis contains no material previously published by any other person except where due acknowledgement has been made. This thesis contains no material which has been accepted for the award of any other degree or diploma in any university. Shuqi Ng March 2017 ABSTRACT With the implementation of the initiatives in reducing emissions from deforestation and forest degradation (REDD), the accurate determination of the spatio-temporal variation of carbon stocks is crucial. Woody vegetation is one of the more noteworthy carbon storage pools. However, ever-changing forest inventory makes it difficult for countries to accurately measure woody biomass and by extension, predict carbon stocks. Although the most accurate mensuration of biomass is to harvest a tree, the method is destructive and obstructs the REDD initiative. Non- destructive methods use dendrometric measurements that have been obtained from non-contact, remote sensing technologies to estimate biomass derived from allometric models. The commodity stereo-camera is an alternate consideration to remote sensing technologies currently used such as terrestrial laser scanning (TLS), which requires specialized equipment and some expertise in using the equipment. Improving technologies and software has enabled the photogrammetric measurements of objects to be reasonably accurate comparative to TLS. As a more mobile and cost-effective equipment, it also addresses some of the issues in using laser technology. In photogrammetric measurement, the application of spatial scale to the model is critical for accurate distance and volume estimates (Miller (2015)).
    [Show full text]
  • Durham E-Theses
    Durham E-Theses Validating Stereoscopic Volume Rendering ROBERTS, DAVID,ANTHONY,THOMAS How to cite: ROBERTS, DAVID,ANTHONY,THOMAS (2016) Validating Stereoscopic Volume Rendering, Durham theses, Durham University. Available at Durham E-Theses Online: http://etheses.dur.ac.uk/11735/ Use policy The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in Durham E-Theses • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. Please consult the full Durham E-Theses policy for further details. Academic Support Oce, Durham University, University Oce, Old Elvet, Durham DH1 3HP e-mail: [email protected] Tel: +44 0191 334 6107 http://etheses.dur.ac.uk Validating Stereoscopic Volume Rendering David Roberts A Thesis presented for the degree of Doctor of Philosophy Innovative Computing Group School of Engineering and Computing Sciences Durham University United Kingdom 2016 Dedicated to My Mom and Dad, my sisters, Sarah and Alison, my niece Chloe, and of course Keeta. Validating Stereoscopic Volume Rendering David Roberts Submitted for the degree of Doctor of Philosophy 2016 Abstract The evaluation of stereoscopic displays for surface-based renderings is well established in terms of accurate depth perception and tasks that require an understanding of the spatial layout of the scene.
    [Show full text]