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A Study Of The Spatial Frequency Analyzing Characteristics Of The Human Visual System
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Book Synopsis A Study of the Spatial Frequency Analyzing Characteristics of the Human Visual System by : Jean Adelaide Tkach
Download or read book A Study of the Spatial Frequency Analyzing Characteristics of the Human Visual System written by Jean Adelaide Tkach and published by . This book was released on 1985 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Some Properties of Spatial Frequency Mechanisms?in the Human Visual System by : M. N. Williams
Download or read book Some Properties of Spatial Frequency Mechanisms?in the Human Visual System written by M. N. Williams and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Emergent Techniques for Assessment of Visual Performance by : National Research Council
Download or read book Emergent Techniques for Assessment of Visual Performance written by National Research Council and published by National Academies Press. This book was released on 1985-01-01 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent vision research has led to the emergence of new techniques that offer exciting potential for a more complete assessment of vision in clinical, industrial, and military settings. Emergent Techniques for Assessment of Visual Performance examines four areas of vision testing that offer potential for improved assessment of visual capability including: contrast sensitivity function, dark-focus of accommodation, dynamic visual acuity and dynamic depth tracking, and ambient and focal vision. In contrast to studies of accepted practices, this report focuses on emerging techniques that could help determine whether people have the vision necessary to do their jobs. In addition to examining some of these emerging techniques, the report identifies their usefulness in predicting performance on other visual and visual-motor tasks, and makes recommendations for future research. Emergent Techniques for Assessment of Visual Performance provides summary recommendations for research that will have significant value and policy implications for the next 5 to 10 years. The content and conclusions of this report can serve as a useful resource for those responsible for screening industrial and military visual function.
Book Synopsis Visual Pattern Analyzers by : Norma Van Surdam Graham
Download or read book Visual Pattern Analyzers written by Norma Van Surdam Graham and published by Oxford University Press, USA. This book was released on 2001-09-20 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organized to help the reader find needed information quickly and easily, this book emphasizes psychophysical experiments which measure the detection and identification of near-threshold patterns and the mathematical models used to draw inferences from experimental results.
Book Synopsis Representations of Spatial Frequency, Depth, and Higher-level Image Content in Human Visual Cortex by : Daniel E. Berman
Download or read book Representations of Spatial Frequency, Depth, and Higher-level Image Content in Human Visual Cortex written by Daniel E. Berman and published by . This book was released on 2018 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The human visual system has been studied in great detail for millennia, but there are substantial, unanswered questions regarding the underlying characteristics of such an important sensory system. Many of these unanswered questions involve the neural correlates in which low-level features are processed in higher-level visual areas. Here, we use functional magnetic resonance imaging (fMRI) to address some of these questions concerning depth and spatial frequency perception in order to elucidate upon such fundamental aspects of visual processing and the mechanisms in which we are able to perceive the world around us. In Chapter 2, we examine the neural correlates of scene content with regards to the spatial frequency contained in these scenes. It has been long debated whether low or high spatial frequencies are what primarily represent the content of a scene and how different scene selective areas such as parahippocampal place area (PPA), retrospenial cortex (RSC) and occipital place area (OPA) process this component of the image we are viewing. Both low and high spatial frequencies contribute to scene representations, but what we find using both univariate and multivariate pattern analysis (MVPA) is that scene content is primarily represented throughout the majority of visual cortex via high spatial frequency information. Interestingly, we find that the posterior portion of PPA may have a unique role in processing low-level features like spatial frequency. Next, we address depth perception, another element of our visual system that is not fully understood. In Chapter 3 we examine whether category-selective areas such as scene-selective areas PPA, RSC and OPA, object-selective area lateral occipital cortex (LOC), face-selective areas fusiform face area (FFA) and occipital face area (OFA), and motion area (MT), are sensitive to a stimulus’ position-in-depth. We find that the scene areas prefer stimuli both behind and in front of fixation, while areas MT and LOC prefer front stimuli. Finally, in Chapter 4 we will examine whether depth representations are organized in a topographical (or “map-like”) manner. Much like classic retinotopic maps defined throughout visual cortex that are based on polar angle and eccentricity measurements utilizing 2-dimensional stimuli, we also find “depthotopic” maps using analogous methodology and analyses, known as phase-encoding mapping, The main modification is that our stimulus periodically cycles through different positions in depth instead of the x and y coordinates of visual field. These experiments provide us with a greater understanding of the neural correlates in which spatial frequency and depth are processed in high-level areas of human visual cortex.
Book Synopsis Spatial Vision by : Russell L. DeValois
Download or read book Spatial Vision written by Russell L. DeValois and published by Oxford University Press. This book was released on 1990-08-09 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents an integrated view of how we perceive the spatial relations in our visual world, covering anatomical, physiological, psychophysical, and perceptual aspects. The authors discuss the visual system primarily in terms of spatial frequency analysis using a linear systems approach. They review evidence supporting a local, patch-by-patch spatial frequency filtering of visual information rather than the global Fourier analysis other researchers have proposed. A separate chapter addresses the special issues surrounding color vision, and a brief, nonmathematical introduction to linear systems analysis is included for the uninitiated reader.
Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, SIld disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna and broader dissemination. tional publishing house to assure improved service Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 30 (thesis year 1985) a total of 12,400 theses titles from 26 Canadian and 186 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work.
Book Synopsis Spatial Frequency Processing in the Human Visual System by : Robert L. Seyfert
Download or read book Spatial Frequency Processing in the Human Visual System written by Robert L. Seyfert and published by . This book was released on 1980 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The human visual system responses to resolution targets whose small area spatial content has been altered from white to black has been investigated. Modified tri-bar targets were presented to observers on a rear projection screen at constant average luminance and varying levels of contrast. Each observer was asked to determine if he could see the target and if the target had been modified. Responses indicate that there is no difference in the visibility of targets in which small areas have been changed to white or black but whose spatial frequency content is the same."--Abstract.
Book Synopsis Spatial Vision by : Russell L. De Valois
Download or read book Spatial Vision written by Russell L. De Valois and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed to present neuroscientists, cognitive psychologists and ophthalmologists with an integrated view of how humans perceive the spatial relations in their visual world, this study covers anatomical, physiological, psychological and perceptual aspects.
Book Synopsis Spatiotemporal Properties of the Visual System and the Effect of Attention by : Patricia Anne Costello
Download or read book Spatiotemporal Properties of the Visual System and the Effect of Attention written by Patricia Anne Costello and published by . This book was released on 2003 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Perception written by R. Held and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 986 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume was designed to focus on the problems of perception and originally was to have been solely edited by Professor Hans-Lukas Teuber who was a member of the editorial board which initiated production of the Handbook. Accordingly, he issued invitations to a number of researchers III perception asking them to contribute chapters written in a style described III his words: " . . . Ire hope that no author lI'ill feel COl/strained to undertake a major search of the literature: he could In'ite, instead. on an area in which he has been quite actire himse?t~ and II'here most of the issues are immediately obt"ious to him. In this Iray, the IITiting of the chapter should be cnjoyable rather than a chore . . it should result in a personal account of the state of a given area rather than in an encyclopedic treatise . . . the field deserves this sort of summary ret'iell", particularly (f it is pointed toward the future and speeds the convergence of det'elopments in sensory physiology and psychological studies of perception, " With the growing burden of national and international commitments includ ing departmental headship, Professor Teuber felt that it would be wise to share the editorial responsibilities for this volume and accordingly, asked Professors Richard Held and Herschel Leibowitz to co-edit the volume with him in the same spirit as outlined in his invitation to authors. They agreed to help in this task.
Book Synopsis Proceedings of the S.I.D. by : Society for Information Display
Download or read book Proceedings of the S.I.D. written by Society for Information Display and published by . This book was released on 1980 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Russell L. De Valois Publisher :Oxford University Press on Demand ISBN 13 :9780195050196 Total Pages :381 pages Book Rating :4.0/5 (51 download)
Book Synopsis Spatial Vision by : Russell L. De Valois
Download or read book Spatial Vision written by Russell L. De Valois and published by Oxford University Press on Demand. This book was released on 1988 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents an integrated view of how we perceive the spatial relations in our visual world, covering anatomical, physiological, psychophysical, and perceptual aspects. The authors discuss the visual system primarily in terms of spatial frequency analysis using a linear systems approach. They review evidence supporting a local, patch-by-patch spatial frequency filtering of visual information rather than the global Fourier analysis other researchers have proposed. A separate chapter addresses the special issues surrounding color vision, and a brief, non-mathematical introduction to linear systems analysis is included for the uninitiated reader.
Book Synopsis An Experimental Study of Spatial Frequency Adaptation Effects in the Human Visual System by : William A. Clemens (CAPT, USAF.)
Download or read book An Experimental Study of Spatial Frequency Adaptation Effects in the Human Visual System written by William A. Clemens (CAPT, USAF.) and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Research on Visual Perception of Complex and Dynamic Imagery by : Allan J. Pantle
Download or read book Research on Visual Perception of Complex and Dynamic Imagery written by Allan J. Pantle and published by . This book was released on 1977 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report discusses three main research topics, each of which is interpreted in terms of a spatial frequency analysis model of the human visual system. Parameters which affect the perception of clusters of line elements in dynamic, computer-generated displays are investigated. Transitions between perception of the moving cluster as a group and perception of the motion of the individual elements of the cluster are studied as a function of display frame rate, subject dark adaptation, image contrast, spatial orientation and various positional perturbations of elements in the cluster. The effect of spatial frequency components on eye movement in real-life scenes was studied by correlating eye movement patterns obtained from photographic scenes which were spatially high-pass filtered, low-pass filtered or unfiltered. Results indicate that areas of scenes containing strong low spatial frequency components attract attention more than areas containing strong high spatial frequency components. Velocity coding in the human visual system was studied by means of moving sinusoidal gratings. Results with complex moving gratings indicate that velocity perception depends partially on the temporal variation of intensity at each point on the retina due to the moving pattern. A complex pattern containing a fundamental spatial frequency and higher harmonic components appears to be moving faster than a stimulus consisting of only the fundamental component and moving at the same velocity as the complex pattern.
Book Synopsis Properties of Human Visual Spatial Frequency Selective Systems by : Joyce Chapin Hirsch
Download or read book Properties of Human Visual Spatial Frequency Selective Systems written by Joyce Chapin Hirsch and published by . This book was released on 1977 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Awards Index written by and published by . This book was released on 1988 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
