Search
Now showing items 21-30 of 55
Phantom Stacks: If You Look Too Hard, They Aren't There
(1980-07-01)
A Stack is a very efficient way of allocating and deallocating memory, but it works only with a restricted pattern of usage. Garbage collection is completely flexible but comparatively costly. The implementation of ...
An Information Processing Approach to Understanding the Visual Cortex
(1980-04-01)
An outline description is given of the experimental work on the visual acuity and hyperacuity of human beings. The very high resolution achieved in hyperacuity corresponds to a fraction of the spacing between adjacent ...
Determining Optical Flow
(1980-04-01)
Optical flow cannot be computed locally, since only one independent measurement is available from the image sequence at a point, while the flow velocity has two components. A second constraint is needed. A method for ...
A Model for the Spatio-Temporal Organization of X- and Y-Type Ganglion Cells in the Primate Retina
(1980-04-01)
A model is proposed for the spatial and temporal characteristics of X- and Y-type responses of ganglion cells in the primate retina. The model is related to a theory of directional selectivity proposed by Marr & Ullman ...
Some Comments on a Recent Theory of Stereopsis
(1980-07-01)
A number of developments have taken place since the formulation of Marr and Poggio's theory of human stereo vision. In particular, these concern the shape of the underlying receptive fields, the control of eye movements ...
Guardians for Concurrent Systems
(MIT Artificial Intelligence Laboratory, 1980-12)
In this paper we survey the current state of the art on fundamental aspects of concurrent systems. We discuss the notion of concurrency and discuss a model of computation which unifies the lambda calculus model and the ...
A Step Towards Automatic Documentation
(MIT Artificial Intelligence Laboratory, 1980-12)
This paper describes a system which automatically generates program documentation. Starting with a plan generated by analyzing the program, the system computes several kinds of summary information about the program. The ...
Spatial Planning: A Configuration Space Approach
(1980-12-01)
This paper presents algorithms for computing constraints on the position of an object due to the presence of obstacles. This problem arises in applications which require choosing how to arrange or move objects among ...
A Computer Implementation of a Theory of Human Stereo Vision
(1980-01-01)
Recently, Marr and Poggio (1979) presented a theory of human stereo vision. An implementation of that theory is presented and consists of five steps: (1) The left and right images are each filtered with masks of four ...
Extra-Retinal Signals Influence Induced Motion: A New Kinetic Illusion
(1980-05-01)
When a moving dot, which is tracked by the eyes and enclosed in a moving framework, suddenly stops while the enclosing framework continues its motion, the dot is seen to describe a curved path. This illusion can be ...