WorldCat Identities

Marr, D.

Overview
Works: 22 works in 32 publications in 2 languages and 29 library holdings
Classifications: Q335.M41, 501.5354
Publication Timeline
Key
Publications about  D Marr Publications about D Marr
Publications by  D Marr Publications by D Marr
Most widely held works by D Marr
Representing visual information by David Marr ( Book )
5 editions published in 1977 in Undetermined and English and held by 3 WorldCat member libraries worldwide
Vision is the construction of efficient symbolic descriptions from images of the world. An important aspect of vision is the choice of representations for the different kinds of information in a visual scene. In the early stages of the analysis of an image, the representations used depend more on what it is possible to compute from an image than on what is ultimately desirable, but later representations can be more sensitive to the specific needs of recognition. This essay surveys recent work in vision at M.I.T. from a perspective in which the representational problems assume a primary importance. An overall framework is suggested for visual information processing, in which the analysis proceeds through three representations; (1) the primal sketch, which makes explicit the intensity changes and local two-dimensional geometry of an image, (2) the 2 1/2-D sketch, which is a viewer-centered representation of the depth, orientation and discontinuities of the visible surfaces, and (3) the 3-D model representation, which allows an object-centered description of the three-dimensional structure and organization of a viewed shape. Recent results concerning processes for constructing and maintaining these representations are summarized and discussed. (Author)
Theory of edge detection by David Marr ( Book )
2 editions published between 1979 and 1980 in English and held by 2 WorldCat member libraries worldwide
A theory of edge detection is presented. (1) Intensity changes, which occur in a natural image over a wide range of scales, are detected separately at different scales. At a given scale, this is best done by finding the zero-crossings of gradient-squared G(x, y) * (I(x, y) for image I, where G(x, y) is a two-dimensional gaussian distribution, and gradient-squared is the Laplacian. (2) The physical phenomena that give rise to the intensity changes are localized. This allows one to construct rules for combining information from the different scales into a primitive description of the image. A physiological model for zero-crossing detection is proposed. (Author)
Early processing of visual information by D Marr ( Book )
2 editions published in 1976 in Undetermined and held by 2 WorldCat member libraries worldwide
Representation and recognition of the spatial organization of three dimensional shapes by David Marr ( Book )
3 editions published between 1976 and 1977 in English and Undetermined and held by 2 WorldCat member libraries worldwide
The human visual process can be studied by examining the computational problems associated with deriving useful information from retinal images. In this paper, we apply this approach to the problem of representing three- dimensional shapes for the purpose of recognition. Three criteria, accessibility, scope and uniqueness, and stability and sensitivity, are presented for judging the usefulness of a representation for shape recognition. Three aspects of a representation's design are considered, use an object-centered coordinate system, include volumetric primitives of varied sizes, and have a modular organization. A representation based on a shape's natural axes (for example the axes identified by a stick figure) follows directly from these choices. The basic process for deriving a shape description in this representation must involve: a means for identifying the natural axes of a shape in its image and a mechanism for transforming viewer-centered axis specifications in an object-centered coordinate system. (Author)
Analysis of occluding contour by David Marr ( Book )
2 editions published in 1976 in Undetermined and English and held by 2 WorldCat member libraries worldwide
A theory of human stereo vision by David Marr ( Book )
1 edition published in 1977 in English and held by 2 WorldCat member libraries worldwide
An algorithm is proposed for solving the stereoscopic matching problem. The algorithm consists of five steps: (1) Each image is filtered with bar masks of four sizes that vary with eccentricity; the equivalent filters are about one octave wide. (2) Zero-crossings of the mask values are localized, and positions that correspond to terminations are found; (3) For each mask size, matching takes place between paris of zero-crossings or terminations of the same sign in the two images, for a range of disparities up to about the width of the mask's central region; (4) Wide masks can control vergence movements, thus causing small masks to come into correspondence; and (5) When a correspondence is achieved, it is written into a dynamic buffer, called the 2-1/2-D sketch. It is shown that this proposal provides a theoretical framework for most existing psychophysical and neurophysiological data about stereopsis. Several critical experimental predictions are also made, for instance about the size of Panum's area under various conditions. The results of such experiments would tell us whether, for example, cooperativity is necessary for the fusion process
Simple memory : a theory for archicortex by David Marr ( Book )
1 edition published in 1971 in English and held by 2 WorldCat member libraries worldwide
Vietnamese historiography in the prerevolutionary period, 1925-1944 by D Marr ( Book )
1 edition published in 1976 in English and held by 1 WorldCat member library worldwide
Evidence for a fifth, smaller channel in early human vision by David Marr ( Book )
1 edition published in 1979 in English and held by 1 WorldCat member library worldwide
Recent studies in psychophysics and neurophysiology suggest that the human visual system utilizes a range of different size or spatial frequency tuned mechanisms in its processing of visual information. It has been proposed that there exist four such mechanisms, operating everywhere in the visual field, with the smallest mechanism having a central excitatory width of 3 in. of arc in the central fovea. This note argues that there exists indirect evidence for the existence of a fifth, smaller channel, with a central width in the fovea of 1.5 in. (Author)
Shi jue ji suan li lun by Maer ( Book )
1 edition published in 1988 in Chinese and held by 1 WorldCat member library worldwide
Ben shu yi ji suan ji ke xue wei he xin, yi shi jue shen jing xin li xue he xin li wu li xue qu de de cheng guo wei ji chu, quan mian lun shu le shi jue ji suan li lun
From understanding computation to understanding neural circuitry by David Marr ( Book )
2 editions published in 1976 in Undetermined and English and held by 1 WorldCat member library worldwide
The CNS needs to be understood at four nearly independent levels of description: (1) that at which the nature of a computation is expressed; (2) that at which the algorithms that implement a computation are characterized; (3) that at which an algorithm is committed to particular mechanisms; and (4) that at which the mechanisms are realized in hardware. In general, the nature of a computation is determined by the problem to be solved, the mechanisms that are used depend upon the available hardware, and the particular algorithms chosen depend on the problem and on the available mechanisms. Examples are given of theories at each level. (Author)
Bandpass channels, zero crossings, and early visual information processing by David Marr ( Book )
1 edition published in 1978 in English and held by 1 WorldCat member library worldwide
A recent advance by B.F. Logan in the theory of one octave bandpass signals may throw new light on spatial-frequency-tuned channels in early visual information processing. (Author)
Simple memory : a theory of archicortex. by D Marr ( )
1 edition published in 1971 in English and held by 1 WorldCat member library worldwide
Simple memory by D Marr ( Book )
1 edition published in 1971 in Undetermined and held by 1 WorldCat member library worldwide
A general theory for cerebral cortex by D Marr ( Book )
1 edition published in 1970 in English and held by 1 WorldCat member library worldwide
Analysis of a cooperative stereo algorithm by David Marr ( Book )
1 edition published in 1977 in English and held by 1 WorldCat member library worldwide
Marr and Poggio (1976) recently described a cooperative algorithm that solves the correspondence problem for stereopsis. This article uses a probabilistic technique to analyze the convergence of that algorithm, and derives the conditions governing the stability of the solution state. The actual results of applying the algorithm to random-dot stereograms are compared with the probabilistic analysis. A satisfactory mathematical analysis of the asymptotic behavior of the algorithm is possible for a suitable choice of the parameter values and loading rules, and again the actual performance of the algorithm under these conditions is compared with the theoretical predictions. Finally, some problems raised by the analysis of this type of 'cooperative' algorithm are briefly discussed. (Author)
Directional selectivity and its use in early visual processing by David Marr ( Book )
1 edition published in 1979 in English and held by 1 WorldCat member library worldwide
The construction of directionally selective units, and their use in the processing of visual motion, are considered. The zero-crossings of Delta 2G(x, y)-I(x, y) are located, as in Marr & Hildreth (1979). In addition, the time derivative d/dt Delta 2G(x, y)-I(x, y) is measured at the zero-crossings, and serves to constraint the local direction of motion to within 180 degrees. The direction of motion is determined in a second stage by combining the local constraints. The second part of the paper suggests a specific model of the information processing carried out by the X and Y cells of the retina and the LGN, and certain classes of cortical simple cells. A number of psychophysical and neurophysiological predictions are derived from the theory. (Author)
Maintaining order in the global society : a critical assessment of normative perspectives by D Marr ( Book )
1 edition published in 1984 in English and held by 1 WorldCat member library worldwide
Early processing of visual information by David Marr ( Book )
1 edition published in 1975 in English and held by 1 WorldCat member library worldwide
The article describes a symbolic approach to visual information proessing, and set out four principles that appear to govern the design of comples symbolic information processing systems. A computational theory of early visual information is presented, which extends to about the level of figure-ground separation. It includes a process-oriented theory of texture vision. Most of the theory has been implemented, and examples are shown of the analysis of several natural images. This replaces AIM-324 and AIM 334
Computation of Stereo Disparity by D Marr ( Book )
1 edition published in 1976 in Undetermined and held by 1 WorldCat member library worldwide
 
moreShow More Titles
fewerShow Fewer Titles
Audience Level
0
Audience Level
1
  Kids General Special  
Audience level: 0.75 (from 0.00 for Simple mem ... to 1.00 for A general ...)
Languages
English (19)
Chinese (1)