WorldCat Identities

Richards, Whitman

Overview
Works: 52 works in 124 publications in 2 languages and 1,888 library holdings
Genres: Conference proceedings 
Roles: Author, Editor, Compiler, Author of introduction
Classifications: BF311, 612.808
Publication Timeline
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Most widely held works by Whitman Richards
Perception: mechanisms and models; readings from Scientific American by Richard Held( Book )
14 editions published between 1970 and 1972 in English and held by 802 WorldCat member libraries worldwide
Natural computation by Whitman Richards( Book )
12 editions published between 1988 and 1994 in 3 languages and held by 570 WorldCat member libraries worldwide
Perception as Bayesian inference ( Book )
11 editions published between 1996 and 2008 in English and held by 288 WorldCat member libraries worldwide
In recent years, Bayesian probability theory has emerged not only as a powerful tool for building computational theories of vision, but also as a general paradigm for studying human visual perception. The Bayesian approach provides new and powerful metaphors for conceptualizing visual perception, suggests novel questions to ask about perceptual processing, and provides the means to formalize theories of perception that make testable predictions about human perceptual performance
Vision research for flight simulation by Whitman Richards( Book )
4 editions published in 1982 in English and held by 61 WorldCat member libraries worldwide
Image understanding : 1985-86 by W Richards( Book )
6 editions published between 1986 and 1987 in English and held by 52 WorldCat member libraries worldwide
Image understanding : 1989 ( Book )
2 editions published between 1984 and 1990 in English and held by 28 WorldCat member libraries worldwide
Image understanding 1985-1986 ( Book )
1 edition published in 1987 in English and held by 6 WorldCat member libraries worldwide
Image understanding 1984 ( Book )
4 editions published between 1984 and 1985 in English and held by 6 WorldCat member libraries worldwide
FACTORS AFFECTING DEPTH PERCEPTION by Whitman Richards( Book )
4 editions published between 1970 and 1975 in English and held by 6 WorldCat member libraries worldwide
The report describes ongoing work on certain factors that affect depth perception. Research has been directed to a study of the relation between depth and disparity, and to obvious individual differences in these relations. This work has led to the discovery that a sizeable portion of the population is 'stereoblind': many individuals are unable to utilize fully all available disparity cues. The character of these deficits suggests a new basis for depth perception. (Author)
Image understanding 1989 by S Ullman( Book )
1 edition published in 1990 in English and held by 4 WorldCat member libraries worldwide
Top-Down Influences on Bottom-Up Processing ( )
4 editions published between 1991 and 1993 in English and held by 4 WorldCat member libraries worldwide
Although integrated computational and psychophysical studies have considerably advanced our understanding of early visual processing (up to Marr's 2 1/2 D Sketch), much less research, by comparison, is being conducted on intermediate and higher-level vision. One reason for the scarcity is that high- level vision includes goal-directed, context-sensitive, top-down knowledge. However, little is known about these aspects of vision and how they are organized in the visual knowledge base (for example how default preferences and categorical states are organized and related). Hence plausible, detailed computational models can't be formulated. These studies begin to reveal the structure of some aspects of cognitive visual knowledge
Color vision and image intensities : when are changes material? by John M Rubin( Book )
1 edition published in 1981 in English and held by 3 WorldCat member libraries worldwide
Marr has emphasized the difficulty in understanding a biological system or its components without some idea of its goals. In this paper, a preliminary goal for color vision is proposed and analyzed. That goal is to determine where changes of material occur in a scene (using only spectral information). This goal is challenging for two reasons. First, the effects of many processes (shadowing, shading from surface orientation changes, highlights, variations in pigment density) are confounded with the effects of material changes in the available image intensities. Second, material changes are essentially arbitrary. We are consequently led to a strategy of rejecting the presence of such confounding processes. We show there is a unique condition, the spectral crosspoint, that allows rejection of the hypothesis that measured image intensities arise from one of the confounding processes. (If plots are made of image intensity versus wavelength from two image regions, and the plots intersect, we say that there is a spectral crosspoint.) We restrict our attention to image intensities measured from regions on opposite sides of an edge because material changes almost always cause edges. Also, by restricting our attention to luminance discontinuities, we can avoid peculiar conspiracies of confounding processes that might mimic a material change. Our crosspoint conjecture is that biological visual systems interpret spectral crosspoints across edges as material changes. A circularly symmetric operator is designed to detect crosspoints; it turns out to resemble the double-opponent cell which is commonplace in biological color vision systems. (Author)
Equation counting and the interpretation of sensory data by Whitman Richards( Book )
1 edition published in 1981 in English and held by 3 WorldCat member libraries worldwide
Many problems in biological information processing require the solution to a complex system of equations in many unknown variables. An equation-counting procedure is described for determining whether such a system of equations will indeed have a unique solution, and under what conditions the solution should be interpreted as 'correct'. Three examples of the procedure are given for illustration, one for auditory signal processing and two from vision. (Author)
Inferring 3D shapes from 2D codons by Whitman Richards( Book )
1 edition published in 1985 in English and held by 3 WorldCat member libraries worldwide
Experiments in Texture Perception ( Book )
3 editions published between 1975 and 1978 in English and held by 3 WorldCat member libraries worldwide
Visual textures may be described completely by their spatial frequency components. For one-dimensional textures whose luminance varies only along the X-axis of the display, the descriptive elements are gratings that have sinusoidal modulations of luminance. Although any arbitrary 1-dimensional 'blurred' texture may require a large number of sinusoidal components for its complete physical description, only 4 components are needed to create a texture that appears the same to the human observer. The human visual system seems does not act like a spectral analyser, but rather appears to process spatial frequency information by filtering operations, at least for 1-dimensional texture patterns. In the more general case, textures will have luminance distributions varying in both X and Y dimensions. A new graphics display is being built to test for the minimum number of spatial frequencies required to simulate 2-dimensional texture patterns. The apparatus will permit on-line control of the amplitude (contrast) of the (X, Y) frequency (Fourier) components that make up the texture displayed. The observer can generate a texture that appears identical to another having a different and more complex spatial frequency content. If it is found that only 4 spatial frequency components are necessary to simulate all 2-dimensional textures, one may design a scheme to transmit visual information about textures that offers considerable saving in channel capacity
From Waltz to Winston (via the connection table) by Whitman Richards( Book )
4 editions published in 1987 in English and Undetermined and held by 3 WorldCat member libraries worldwide
The influence of oculomotor systems on visual perception ( Book )
2 editions published between 1968 and 1969 in English and held by 2 WorldCat member libraries worldwide
This report describes ongoing work on the influence of the oculomotor systems upon visual perception. Three different problems are being considered: (1) Saccadic suppression, (2) Size-scaling, and (3) The 'corridor' illusion. Of particular interest is whether or not efferent or outflow mechanisms play a significant role in these perceptual phenomena. A 'perspective' illusion of depth has been examined in order to show that planar illusions involve mechanisms different from those underlying size/depth invariances. (Author)
A lightness scale from image intensity distributions by Whitman Richards( Book )
1 edition published in 1981 in English and held by 2 WorldCat member libraries worldwide
A lightness scale is derived from a theoretical estimate of the probability distribution of image intensities for natural scenes. The derived image intensity distribution considers three factors: reflectance, surface orientation and illumination, and surface texture (or roughness). The convolution of the effects of these three factors yields the theoretical probability distribution of image intensities. A useful lightness scale should be the integral of this probability density function, for then equal intervals along the scale are equally probable and carry equal information. The result is a scale similar to that used in photography, or by the nervous system as its transfer function. (Author)
Image understanding nineteen hundred and eighty-five to eighty-six Image understanding 1985-86 ( Book )
1 edition published in 1987 in English and held by 2 WorldCat member libraries worldwide
Vision algorithms and psychophysics : final report by Whitman Richards( Book )
1 edition published in 1990 in English and held by 2 WorldCat member libraries worldwide
 
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Alternative Names
Richards, Whitman
リチャーズ, ホイットマン
Languages
English (72)
Japanese (4)
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