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COMPGEOM
2009
ACM
14 years 2 months ago
Near-linear approximation algorithms for geometric hitting sets
Given a set system (X, R), the hitting set problem is to find a smallest-cardinality subset H ⊆ X, with the property that each range R ∈ R has a non-empty intersection with H...
Pankaj K. Agarwal, Esther Ezra, Micha Sharir
JOLLI
1998
78views more  JOLLI 1998»
13 years 7 months ago
Proof Nets and the Complexity of Processing Center Embedded Constructions
This paper shows how proof nets can be used to formalize the notion of “incomplete dependency” used in psycholinguistic theories of the unacceptability of center-embedded const...
Mark Johnson
COMPGEOM
2009
ACM
14 years 2 months ago
PTAS for geometric hitting set problems via local search
We consider the problem of computing minimum geometric hitting sets in which, given a set of geometric objects and a set of points, the goal is to compute the smallest subset of p...
Nabil H. Mustafa, Saurabh Ray
NGC
2006
Springer
135views Communications» more  NGC 2006»
13 years 7 months ago
Seeing Things: Inventive Reasoning with Geometric Analogies and Topographic Maps
This paper examines two seemingly unrelated qualitative spatial reasoning domains; geometric proportional analogies and topographic (landcover) maps. We present a Structure Matchin...
Diarmuid P. O'Donoghue, Amy J. Bohan, Mark T. Kean...
CVPR
2009
IEEE
14 years 2 months ago
On bias correction for geometric parameter estimation in computer vision
Maximum likelihood (ML) estimation is widely used in many computer vision problems involving the estimation of geometric parameters, from conic fitting to bundle adjustment for s...
Takayuki Okatani, Koichiro Deguchi