Computational theories of structure from motion [Ulman, 1979] and stereo vision [Marr and Poggio, 1979] only specify the computation of three-dimensional surface information at special points in the image. Yet, the ...

A Lisp pretty printer is presented which makes it easy for a user to control the format of the output produced. The printer can be used as a general mechanism for printing data structures as well as programs. It is ...

Tinker is an experimental interactive programming system which integrates program testing with program design. New procedures are created by working out the steps of the procedure in concrete situations. Tinker displays ...

This is a case study of how one child learned to write in a computer-rich setting. Although computer access did affect her learning significantly, the details presented here go beyond supporting that claim. They provide ...

Central to contemporary cognitive science is the notion that mental processes involve computations defined over internal representations. This notion stands in sharp contrast with another prevailing view ??e direct ...

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 ...

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 ...

The work of the Cerebral Palsy project (members: Seymour Papert, Sylvia Weir, Jose Valente and Gary Drescher) over the past eighteen months is summarized, and the next phase of activity is outlined. The issues to be ...

In previous heap storage systems, the cost of creating objects and garbage collection is independent of the lifetime of the object. Since objects with short lifetimes account for a large portion of storage use, it's ...

We have designed and implemented a single-chip microcomputer (which we call SCHEME-79) which directly interprets a typed pointer variant of SCHEME, a dialect of the language LISP. To support this interpreter the chip ...

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 ...

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 ...

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 ...

A reference manual for the extensible, customizable, self-documenting real-time display editor. This manual corresponds to EMACS version 162.

A reference manual for the extensible, customizable, self-documenting real-time display editor. This manual corresponds to EMACS version 162.

This paper explores the nature of the underlying representation of a sentence, that representation formulated to make explicit the semantic structure of a sentence as a description of an event. It argues that the ...

Truth maintenance systems have been used in several recent problem solving systems to record justifications for deduced assertions, to track down the assumptions which underlie contradictions when they arise, and to ...

This paper discusses three main problems associated with the control of the motion of a mechanical arm. 1) Transformation between different coordinate systems associated with the arm. 2) Calculation of detailed ...

This work proposes a theory for machine learning of disjunctive concepts. The paradigm followed is one of teaching and testing, where the teaching is accomplished by presenting a sequence of positive and negative ...

During the school year 1977/78 four computers equipped with LOGO and Turtle Graphics were installed in an elementary school in Brookline, Mass. All sixth grade students in the school had between 20 and 40 hours of ...