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A Perturbation Scheme for Spherical Arrangements with Application to Molecular Modeling
(1997-12-01)
We describe a software package for computing and manipulating the subdivision of a sphere by a collection of (not necessarily great) circles and for computing the boundary surface of the union of spheres. We present problems ...
Paradigms for Structure in an Amorphous Computer
(1997-10-01)
Recent developments in microfabrication and nanotechnology will enable the inexpensive manufacturing of massive numbers of tiny computing elements with sensors and actuators. New programming paradigms are required for ...
Supporting Dynamic Languages on the Java Virtual Machine
(1996-04-01)
In this note, I propose two extensions to the Java virtual machine (or VM) to allow dynamic languages such as Dylan, Scheme and Smalltalk to be efficiently implemented on the VM. These extensions do not affect the performance ...
An Algorithm for Group Formation and Maximal Independent Set in an Amorphous Computer
(1998-02-01)
Amorphous computing is the study of programming ultra-scale computing environments of smart sensors and actuators cite{white-paper}. The individual elements are identical, asynchronous, randomly placed, embedded and ...
Restructuring Sparse High Dimensional Data for Effective Retrieval
(1998-05-01)
The task in text retrieval is to find the subset of a collection of documents relevant to a user's information request, usually expressed as a set of words. Classically, documents and queries are represented as vectors ...
Sparse Representations for Fast, One-Shot Learning
(1997-11-01)
Humans rapidly and reliably learn many kinds of regularities and generalizations. We propose a novel model of fast learning that exploits the properties of sparse representations and the constraints imposed by a plausible ...
An Accelerated Chow and Liu Algorithm: Fitting Tree Distributions to High Dimensional Sparse Data
(1999-01-01)
Chow and Liu introduced an algorithm for fitting a multivariate distribution with a tree (i.e. a density model that assumes that there are only pairwise dependencies between variables) and that the graph of these dependencies ...
Direct Estimation of Motion and Extended Scene Structure from a Moving Stereo Rig
(1998-12-01)
We describe a new method for motion estimation and 3D reconstruction from stereo image sequences obtained by a stereo rig moving through a rigid world. We show that given two stereo pairs one can compute the motion of the ...
Separating Reflections from Images Using Independent Components Analysis
(1998-09-01)
The image of an object can vary dramatically depending on lighting, specularities/reflections and shadows. It is often advantageous to separate these incidental variations from the intrinsic aspects of an image. Along these ...
A Binocular, Foveated Active Vision System
(1998-03-01)
This report documents the design and implementation of a binocular, foveated active vision system as part of the Cog project at the MIT Artificial Intelligence Laboratory. The active vision system features a three degree ...