Download or read book The Limiting Effect of the Human Visual System on Image Processing written by Timothy J. Wilson and published by . This book was released on 1980 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contrast Sensitivity of the Human Eye and Its Effects on Image Quality written by Peter G. J. Barten and published by SPIE-International Society for Optical Engineering. This book was released on 1999 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the contrast sensitivity of the human visual system - concerning the eye's ability to distinguish objects from each other or from the background - and its effects on the imageforming process. The text provides equations for determining various aspects of contrast sensitivity, in addition to models that easily can be used for practical applications.
Download or read book A Model of Image Processing in the Human Visual System written by Ilan Tamches and published by . This book was released on 1972 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Webvision written by Helga Kolb and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Stabilized Image Adaptation in the Human Visual System a Model for Spatial Temporal Luminance and Chromatic Effects written by Jesse D. Olson and published by . This book was released on 1994 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Digital Image Processing 2 e written by Gonzalez and published by Pearson Education India. This book was released on 2002 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Making Eye Health a Population Health Imperative written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-01-15 with total page 587 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to see deeply affects how human beings perceive and interpret the world around them. For most people, eyesight is part of everyday communication, social activities, educational and professional pursuits, the care of others, and the maintenance of personal health, independence, and mobility. Functioning eyes and vision system can reduce an adult's risk of chronic health conditions, death, falls and injuries, social isolation, depression, and other psychological problems. In children, properly maintained eye and vision health contributes to a child's social development, academic achievement, and better health across the lifespan. The public generally recognizes its reliance on sight and fears its loss, but emphasis on eye and vision health, in general, has not been integrated into daily life to the same extent as other health promotion activities, such as teeth brushing; hand washing; physical and mental exercise; and various injury prevention behaviors. A larger population health approach is needed to engage a wide range of stakeholders in coordinated efforts that can sustain the scope of behavior change. The shaping of socioeconomic environments can eventually lead to new social norms that promote eye and vision health. Making Eye Health a Population Health Imperative: Vision for Tomorrow proposes a new population-centered framework to guide action and coordination among various, and sometimes competing, stakeholders in pursuit of improved eye and vision health and health equity in the United States. Building on the momentum of previous public health efforts, this report also introduces a model for action that highlights different levels of prevention activities across a range of stakeholders and provides specific examples of how population health strategies can be translated into cohesive areas for action at federal, state, and local levels.
Download or read book Computer Vision written by Ian Overington and published by North Holland. This book was released on 1992 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique volume is a comprehensive, self-consistent coverage of one approach to computer vision, with many direct or implied links to human vision. The book is the result of many years spent by the author in research into the limits of human visual performance and the interactions between the observer and his environment. A wide-ranging and largely novel approach to computer vision is described. The treatment starts with a summary account of important aspects of human visual function. This is then followed by a progressive development of the computer image processing, from sub-pixel fragmentary edge determination to optical flow field analysis, local and global stereo analysis, colour imagery, edge-based region segmentation, perceptual texture segmentation and high fidelity contour form analysis. This treatment is considerably different from other more publicised approaches, and is highly recommended for those seeking a dynamic new approach to computer vision.
Download or read book Invariance in Human Visual Perception written by Chetan Nandakumar and published by . This book was released on 2011 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation explores invariance in human visual perception via three unique studies. In the first two studies we probe the visual system to see how robust it is to impoverished stimuli. These investigations not only offer limits on perceptual abilities, but also offer key insights into the mechanisms underlying vision. The first study explores rapid category detection, as discovered by Thorpe, Fize, and Marlot (1996). This study demonstrated that the human visual system can detect object categories in natural images in as little as 150 ms. To gain insight into this phenomenon and to determine its relevance to naturally occurring conditions, we degrade the stimulus set along a wide variety of image dimensions and investigate the effects on perception. We discover that rapid category detection in humans is quite robust to naturally occurring degradations and is mediated by a non-linear interaction of visual features. This investigation into degradation is followed by our second study where we explore the limits of 3D shape perception. The shape-from-texture and shape-from-shading perspectives would motivate that 3-D perception vanishes once low-level cues are disrupted. Is this the case in human vision? Or can top-down influences salvage the percept? In this study, we explore this question by employing a gauge-figure paradigm similar to that used by Koenderink et al (1992). Subjects were presented degraded natural images and instructed to make local assessments of slant and tilt at various locations thereby quantifying their internal 3-D percept. Analysis of subjects' responses reveals recognition to be a significant influence thereby allowing subjects to perceive 3-D shape at high levels of degradation. Specifically, we identify the medium-blur condition, images approximately 32 pixels on a side, to be the limit for accurate 3-D shape perception. In addition, we find that degradation affects the perceived slant of point-estimates making images look flatter as degradation increases. These 2 studies, in conjunction with previous work, point to 32-pixel color images as a rough threshold for a rich perceptual experience. The first study demonstrates that rapid recognition breaks down at around this point, and the second shows that it is also the limit to reliably perceive 3-D shape. Presumably many perceptual abilities are tied together at this level - shape, recognition, etc, so that when one percept is lost, other percepts break as well. In the third study, we explore how invariant properties of the natural world drive perceptual coding mechanisms in the brain. Specifically, we explore how the statistics of object regions in natural images motivate a sensitivity to hue by the perceptual system. To investigate this question, we compute the coding advantage of using hue angle to encode color inside real-world object regions. For this analysis, we use natural image datasets which provide pre-segmented object regions and surfaces.
Download or read book Limits in Perception written by van Doorn and published by CRC Press. This book was released on 2020-01-29 with total page 609 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an analysis of limits in perception from the vantage point of the physicist, the engineer, the psychophysicist, the psychologist and the theorist. Limits in perception find their causal explanation at many logically and/or physically different levels. Some of the most fundamental bottlenecks are due to the quantum mechanical and atomistic structure of the microworld. Other simple constraints are due to the material constitution of sensory organs. For instance, the fact that the eye is predominantly composed of water limits both the optical quality and the available spectral window. The engineer uses knowledge on such limits to design equipment that optimizes human performance in daily life. Examples include room acoustics and visual displays. Psychophysicists and psychologists deal with limits on a quite different logical level. These limits constrain much of our perceptually guided behaviour. The book includes chapters on such topics as movement perception, binocular vision, illusory phenomena, language and perception, the perception of time. A few concluding chapters on fundamental limits imposed by information theoretical constraints on the coding and representation of sensed structure are included. Limits in Perception will be important reading material for scientists and/or engineers in the following fields: perception, experimental psychology, sensory biology, physics, neuroscience, human engineering, artificial intelligence, robotics, ophthalmology, audiology, psychonomics and ergonomics, remote sensing.
Download or read book A Physiologically Based Human Visual System Model for Threshold Vision and Image Processing written by Kou-Hu Tzou and published by . This book was released on 1983 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Foundations of Vision written by Brian A. Wandell and published by Sinauer Associates, Incorporated. This book was released on 1995 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed for students, scientists and engineers interested in learning about the core ideas of vision science, this volume brings together the broad range of data and theory accumulated in this field.
Download or read book Research Awards Index written by and published by . This book was released on 1989 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contrast Sensitivity of the Human Eye and Its Effects on Image Quality written by Peter G. J. Barten and published by SPIE Press. This book was released on 1999 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the contrast sensitivity of the human visual system - concerning the eye's ability to distinguish objects from each other or from the background - and its effects on the imageforming process. The text provides equations for determining various aspects of contrast sensitivity, in addition to models that easily can be used for practical applications.
Download or read book Digital Video Quality written by Stefan Winkler and published by John Wiley & Sons. This book was released on 2013-05-28 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Visual quality assessment is an interdisciplinary topic that links image/video processing, psychology and physiology. Many engineers are familiar with the image/video processing; transmission networks side of things but not with the perceptual aspects pertaining to quality. Digital Video Quality first introduces the concepts of human vision and visual quality. Based on these, specific video quality metrics are developed and their design is presented. These metrics are then evaluated and used in a number of applications, including image/video compression, transmission and watermarking. Introduces the concepts of human vision and vision quality. Presents the design and development of specific video quality metrics. Evaluates video quality metrics in the context of image/video compression, transmission and watermarking. Presents tools developed for the analysis of video quality
Download or read book Motion Analysis and Image Sequence Processing written by M. Ibrahim Sezan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 499 pages. Available in PDF, EPUB and Kindle. Book excerpt: An image or video sequence is a series of two-dimensional (2-D) images sequen tially ordered in time. Image sequences can be acquired, for instance, by video, motion picture, X-ray, or acoustic cameras, or they can be synthetically gen erated by sequentially ordering 2-D still images as in computer graphics and animation. The use of image sequences in areas such as entertainment, visual communications, multimedia, education, medicine, surveillance, remote control, and scientific research is constantly growing as the use of television and video systems are becoming more and more common. The boosted interest in digital video for both consumer and professional products, along with the availability of fast processors and memory at reasonable costs, has been a major driving force behind this growth. Before we elaborate on the two major terms that appear in the title of this book, namely motion analysis and image sequence processing, we like to place them in their proper contexts within the range of possible operations that involve image sequences. In this book, we choose to classify these operations into three major categories, namely (i) image sequence processing, (ii) image sequence analysis, and (iii) visualization. The interrelationship among these three categories is pictorially described in Figure 1 below in the form of an "image sequence triangle".
