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Transparency
(MIT Artificial Intelligence Laboratory, 1975-07)
How People Execute Handwriting
(MIT Artificial Intelligence Laboratory, 1975-07)
Handwriting is shown to be composed mainly of cup-shaped strokes lasting approximately 200 msec. The strokes are based on a hexagonal pattern, with quantized slopes and lengths. Each side of the hexagon is produced by a ...
Using Parallel Processing for Problem Solving
(1979-12-01)
Parallel processing as a conceptual aid in the design of programs for problem solving applications is developed. A pattern directed invocation language know as Ether is introduced. Ether embodies tow notions in language ...
Numerical Shape from Shading and Occluding Contours in a Single View
(1979-11-01)
An iterative method of using occluding boundary information is proposed to compute surface slope from shading. We use a stereographic space rather than the more commonly used gradient space in order to express occluding ...
Constraints on the Visual Interpretation of Surface Contours
(1979-03-01)
This article examines the computational problems underlying the 3-D interpretation of surface contours. A surface contour is the image of a curve across a physical surface, such as the edge of a shadow cast across a ...
CADR
(1979-05-01)
The CADR machine, a revised version of the CONS machine, is a general-purpose, 32-bit microprogrammable processor which is the basis of the Lisp-machine system, a new computer system being developed by the Laboratory ...
Debunking the 'Expensive Procedure Call' Myth, or, Procedure Call Implementations Considered Harmful, or, Lambda: The Ultimate GOTO
(1977-10-01)
Folklore states that GOTO statements are 'cheap', while procedure calls are 'expensive'. This myth is largely a result of poorly designed language implementations. The historical growth of this myth is considered. Both ...
Density Reconstruction Using Arbitrary Ray Sampling Schemes
(1977-09-01)
Methods for calculating the distribution of absorption densities in a cross section through an object from density integrals along rays in the plane of the cross section are well known, but are restricted to particular ...
Fan-beam Reconstruction Methods
(1977-11-01)
In a previous paper a technique was developed for finding reconstruction algorithms for arbitrary ray-sampling schemes. The resulting algorithms use a general linear operator, the kernel of which depends on the details ...
Understanding Hand-Printed Algebra for Computer Tutoring
(1977-02-01)
This thesis demonstrates how the use of a global context can improve the power of a local character recognizer. The global context considered is a computer tutor of high school algebra that observes a student working ...