max planck institut
informatik

# MPI-I-94-111

## On the width and roundness of a set of points in the plane

### Smid, Michiel and Janardan, Ravi

MPI-I-94-111. March 1994, 14 pages. | Status: available - back from printing | Next --> Entry | Previous <-- Entry

Abstract in LaTeX format:
Let $S$ be a set of points in the plane. The width (resp.\
roundness) of $S$ is defined as the minimum width of any
slab (resp.\ annulus) that contains all points of $S$.
We give a new characterization of the width of a point set.
Also, we give a {\em rigorous} proof of the fact that either the
roundness of $S$ is equal to the width of $S$, or the center
of the minimum-width annulus is a vertex of the closest-point
Voronoi diagram of $S$, the furthest-point Voronoi diagram
of $S$, or an intersection point of these two diagrams.
This proof corrects the characterization of roundness used
extensively in the literature.
Acknowledgement:
References to related material:

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BibTeX
@TECHREPORT{SmidRavi94,
AUTHOR = {Smid, Michiel and Janardan, Ravi},
TITLE = {On the width and roundness of a set of points in the plane},
TYPE = {Research Report},
INSTITUTION = {Max-Planck-Institut f{\"u}r Informatik},