Browsing AI Memos (1959 - 2004) by Author "Ullman, Shimon"
Now showing items 1-20 of 20
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The Alignment of Objects with Smooth Surfaces
(1988-07-01)This paper examines the recognition of rigid objects bounded by smooth surfaces using an alignment approach. The projected image of such an object changes during rotation in a manner that is difficult to predict. A ... -
An Approach To Object Recognition: Aligning Pictorial Descriptions
(1986-12-01)This paper examines the problem of shape-based object recognition and proposes a new approach, the alignment of pictorial descriptions. The first part of the paper reviews general approaches to visual object recognition ... -
Computational Studies in the Interpretation of Structure and Motion: Summary and Extension
(1983-03-01)Computational studies of the interpretation of structure from motion examine the conditions under which three-dimensional structure can be recovered from motion in the image. The first part of this paper summarizes the ... -
The Computational Study of Vision
(1988-04-01)The computational approach to the study of vision inquires directly into the sort of information processing needed to extract important information from the changing visual image---information such as the three-dimensional ... -
Filling in the Gaps: The Shape of Subjective Contours and a Model for Their Generation
(1976-10-01)The properties of isotropy, smoothness, minimum curvature and locality suggest the shape of filled-in contours between two boundary edges. The contours are composed of the arcs of two circles tangent to the given ... -
Interfacing the One-Dimensional Scanning of an Image with the Applications of Two-Dimensional Operators
(1980-04-01)To interface between the one-dimensional scanning of an image, and the applications of a two-dimensional operator, an intermediate storage is required. For a square image of size n2, and a square operator of size m2, ... -
Limitations of Non Model-Based Recognition Schemes
(1991-05-01)Different approaches to visual object recognition can be divided into two general classes: model-based vs. non model-based schemes. In this paper we establish some limitation on the class of non model-based recognition ... -
Maximizing Rigidity: The Incremental Recovery of 3-D Structure from Rigid and Rubbery Motion
(1983-06-01)The human visual system can extract 3-D shape information of unfamiliar moving objects from their projected transformations. Computational studies of this capacity have established that 3-D shape, can be extracted ... -
The Measurement of Visual Motion
(1982-12-01)The analysis of visual motion divides naturally into two stages: the first is the measurement of motion, for example, the assignment of direction and magnitude of velocity to elements in the image, on the basis of the ... -
The Measurement of Visual Motion
(1982-12-01)The analysis of visual motion divides naturally into two stages: the first is the measurement of motion, for example, the assignment of direction and magnitude of velocity to elements in the image, on the basis of the ... -
Model-Driven Geometry Theorem Prover
(1975-05-01)This paper describes a new Geometry Theorem Prover, which was implemented to illuminate some issues related to the use of models in theorem provin. The paper is divided into three parts: Part 1 describes G.T.P. and ... -
On Visual Detection of Light Sources
(1975-05-01)The paper addresses the following problem: Given an array of light intensities obtained from some scene, find the light sources in the original scene. The following factors are discussed from the point of view of their ... -
The Optical Flow of Planar Surfaces
(1985-12-01)The human visual system can recover the 3D shape of moving objects on the basis of motion information alone. Computational studies of this capacity have considered primarily non-planar rigid objects. With respect to ... -
Recognition by Linear Combinations of Models
(1989-08-01)Visual object recognition requires the matching of an image with a set of models stored in memory. In this paper we propose an approach to recognition in which a 3-D object is represented by the linear combination of 2-D ... -
Recognizing Rigid Objects by Aligning Them with an Image
(1987-01-01)This paper presents an approach to recognition where an object is first {\\it aligned} with an image using a small number of pairs of model and image features, and then the aligned model is compared directly against ... -
Rigidity and Smoothness of Motion
(1987-11-01)sMany theories of structure from motion divide the process into twosparts which are solved using different assumptions. Smoothness of thesvelocity field is often assumed to solve the motion correspondencesproblem, and then ... -
Selecting One Among the Many: A Simple Network Implementing Shifts in Selective Visual Attention
(1984-01-01)This study addresses the question of how simple networks can account for a variety of phenomena associated with the shift of a specialized processing focus across the visual scene. We address in particular aspects of ... -
Sequence-Seeking and Counter Streams: A Model for Information Processing in the Cortex
(1991-12-01)This paper presents a model for the general flow in the neocortex. The basic process, called "sequence-seeking," is a search for a sequence of mappings or transformations, linking source and target representations. The ... -
Structural Saliency: The Detection of Globally Salient Structures Using a Locally Connected Network
(1988-07-01)Certain salient structures in images attract our immediate attention without requiring a systematic scan. We present a method for computing saliency by a simple iterative scheme, using a uniform network of locally ... -
Visual Routines
(1983-06-01)This paper examines the processing of visual information beyond the creation of the early representations. A fundamental requirement at this level is the capacity to establish visually abstract shape properties and ...
