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EUROCRYPT
2003
Springer
15 years 8 months ago
CAPTCHA: Using Hard AI Problems for Security
We introduce captcha, an automated test that humans can pass, but current computer programs can’t pass: any program that has high success over a captcha can be used to solve an u...
Luis von Ahn, Manuel Blum, Nicholas J. Hopper, Joh...
ICEIS
1999
IEEE
15 years 7 months ago
Contour Estimation on Piecewise Homogeneous Random Fields
: Contour Estimation, Bayesian Estimation, Random Fields, Dynamic Programming, Multigrid Methods. This paper addresses contour estimation on images modeled as piecewise homogeneous...
José A. Moinhos Cordeiro, José M. B....
SIGGRAPH
1998
ACM
15 years 7 months ago
A Perceptually Based Adaptive Sampling Algorithm
A perceptually based approach for selecting image samples has been developed. An existing image processing vision model has been extended to handle color and has been simplified ...
Mark R. Bolin, Gary W. Meyer
HPDC
1993
IEEE
15 years 7 months ago
Supporting Heterogeneity and Distribution in the Numerical Propulsion System
The Numerical Propulsion System Simulation (NPSS) project has been initiated by NASA to explore the use of computer simulation in the development of new aircraft propulsion techno...
Patrick T. Homer, Richard D. Schlichting
ICS
1993
Tsinghua U.
15 years 7 months ago
The EM-4 Under Implicit Parallelism
: The EM-4 is a supercomputer that offers very fast inter processor communication and support for multi threading. In this paper we demonstrate that the EM-4, Together with an auto...
Lubomir Bic, Mayez A. Al-Mouhamed