@Article{landau1994:subset,
author = {Landau, Pierre and Schwartz, Eric L.},
title = {Subset warping: {Rubber} sheeting with cuts},
journal = {CVGIP: Graphical Models and Image Processing},
year = 1994,
volume = 56,
number = 3,
pages = {247--266},
month = {May},
datestr = 199405,
INSPEC = 4753647,
abstract = {Image warping, often referred to as ``rubber
sheeting,'' represents the deformation of a domain
image space into a range image space. In this paper,
a technique which extends the definition of a
rubber-sheet transformation to allow a polygonal
region to be warped into one or more subsets of
itself, where the subsets may be multiply connected,
is described. To do this, it constructs a set of
``slits'' in the domain image, which correspond to
discontinuities and concavities in the range image,
using a technique based on generalized Voronoi
diagrams. The concept of medial axis is extended to
describe inner and outer medial contours of a
polygon. Polygonal regions are decomposed into
annular subregions, and path homotopies are
introduced to describe the annular subregions. These
constructions motivate the definition of a ladder,
which guides the construction of grid point pairs
necessary to effect the warp itself.},
keywords = {computational geometry; image segmentation}
}