1# Library to Find Best eBook for Read
Author : George Vogiatzis
Release : 2006
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Visual Estimation of Shape, Reflectance and Illumination by : George Vogiatzis
Download or read book Visual Estimation of Shape, Reflectance and Illumination written by George Vogiatzis. This book was released on 2006. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Roland William Fleming
Release : 2004
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Human Visual Perception Under Real-world Illumination by : Roland William Fleming
Download or read book Human Visual Perception Under Real-world Illumination written by Roland William Fleming. This book was released on 2004. Available in PDF, EPUB and Kindle. Book excerpt: How does the visual system achieve stable estimates of surface properties - such as reflectance and 3D shape - across changes in the illumination? Under arbitrary patterns of illumination this problem is ill-posed. However, in the real world, illumination is not arbitrary. Here I argue that the visual system exploits the statistical regularities of real-world illuminations to achieve stable estimates of shape and surface reflectance properties. Specifically, I suggest that the visual system derives measurements from specular reflections that are (i) diagnostic of surface properties and (ii) relatively well-conserved across real-world scenes. One consequence of the theory is that the visual system does not have to estimate and explicitly 'discount' illumination to recover shape and surface reflectance. In support of this idea, subjects are shown to be good at estimating surface reflectance and 3D shape without any context to specify the surrounding scene, as long as the illumination is realistic. However, when the pattern of illumination is unrealistic, shape and surface reflectance estimation degrade in predictable ways. Systematic manipulation of illumination statistics reveals some properties of illumination that are important for surface reflectance estimation. To understand 3D shape constancy, I discuss the way that 3D surface curvature distorts the reflected world. For the special case of mirrored surfaces, I show how populations of oriented linear filters can 'read' the pattern of distortions to recover 3D surface curvatures. Finally I show that this principle applies to cases other than perfect mirrors, and can predict both successes and failures of human shape constancy as the illumination changes.
Author : Darrell R. Hougen
Release : 1994
Genre : Computer vision
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Estimation of Shape, Lighting, and Reflectivity from Stereo and Shading Information by : Darrell R. Hougen
Download or read book Estimation of Shape, Lighting, and Reflectivity from Stereo and Shading Information written by Darrell R. Hougen. This book was released on 1994. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "This thesis is concerned with the combined use of stereo and shading information for the purpose of three-dimensional surface shape estimation. The applicability, resolution, and accuracy of each individual method is examined and compared with that attainable in a combined approach. Integration is examined from standard and stochastic perspectives. The standard approach involves use of stereo information as an initial estimate of the surface shape from which parameters of the shading method such as the light source direction can be estimated. Issues of lighting and reflectivity estimation are addressed and solutions are advanced. In particular, general methods for estimation of the light source distribution and reflectance map are proposed and tested. Colored lighting and color variant reflectance functions are examined as possible sources of additional shape information. A statistical approach to surface shape estimation called 'shape from appearance' is also advanced. In this approach, stereo information is used indirectly as a source of statistical information. It is shown that through a scale change the resulting statistical model can be used to achieve higher resolution than is achievable through the direct use of stereo information."
Author : Xiuming Zhang (Scientist in electrical engineering and computer science)
Release : 2021
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Shape, Reflectance, and Illumination from Appearance by : Xiuming Zhang (Scientist in electrical engineering and computer science)
Download or read book Shape, Reflectance, and Illumination from Appearance written by Xiuming Zhang (Scientist in electrical engineering and computer science). This book was released on 2021. Available in PDF, EPUB and Kindle. Book excerpt: The image formation process describes how light interacts with the objects in a scene and eventually reaches the camera, forming an image that we observe. Inverting this process is a long-standing, ill-posed problem in computer vision, which involves estimating shape, material properties, and/or illumination passively from the object's appearance. Such "inverse rendering" capabilities enable 3D understanding of our world (as desired in autonomous driving, robotics, etc.) and computer graphics applications such as relighting, view synthesis, and object capture (as desired in extended reality [XR], etc.)
Author : Michael S. Landy
Release : 1991
Genre : Computer simulation
Kind : eBook
Book Rating : 552/5 ( reviews)
Book Synopsis Computational Models of Visual Processing by : Michael S. Landy
Download or read book Computational Models of Visual Processing written by Michael S. Landy. This book was released on 1991. Available in PDF, EPUB and Kindle. Book excerpt: The more than twenty contributions in this book, all new and previously unpublished, provide an up-to-date survey of contemporary research on computational modeling of the visual system. The approaches represented range from neurophysiology to psychophysics, and from retinal function to the analysis of visual cues to motion, color, texture, and depth. The contributions are linked thematically by a consistent consideration of the links between empirical data and computational models in the study of visual function. An introductory chapter by Edward Adelson and James Bergen gives a new and elegant formalization of the elements of early vision. Subsequent sections treat receptors and sampling, models of neural function, detection and discrimination, color and shading, motion and texture, and 3D shape. Each section is introduced by a brief topical review and summary. ContributorsEdward H. Adelson, Albert J. Ahumada, Jr., James R. Bergen, David G. Birch, David H. Brainard, Heinrich H. Bülthoff, Charles Chubb, Nancy J. Coletta, Michael D'Zmura, John P. Frisby, Norma Graham, Norberto M. Grzywacz, P. William Haake, Michael J. Hawken, David J. Heeger, Donald C. Hood, Elizabeth B. Johnston, Daniel Kersten, Michael S. Landy, Peter Lennie, J. Stephen Mansfield, J. Anthony Movshon, Jacob Nachmias, Andrew J. Parker, Denis G. Pelli, Stephen B. Pollard, R. Clay Reid, Robert Shapley, Carlo L. M. Tiana, Brian A. Wandell, Andrew B. Watson, David R. Williams, Hugh R. Wilson, Yuede. Yang, Alan L. Yuille
