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Title: Segmentation of Overlapping Objects
Authors:
L.J. van Vliet,
P.W. Verbeek
in: Abstracts of the first imaging workshop of the Advanced School for Computing
and Imaging, Venray (The Netherlands), October 25-27, 1995, pp. 5-6.
Abstract
A 2-D input image is filtered by a series of orientation selective
filters. These orientation selective filters are rotated versions of each
other in the interval 0-pi. The output of each filter indicates the presence
of the corresponding orientation. Responses on a line or edge yield a single
peak as a function of orientation. When stacking the filtered images we
obtain a 3-D image (x,y,phi) in which the third-axis phi
is periodic (with period pi). Assuming bandlimited images and small filter
support we measure small changes in orientation when moving along linear
image features such as lines or edges. All single objects that appear
connected in the 2-D input image remain connected in the 3-D orientation
space.
At the crossings of two lines we obtain two distinct peaks in orientation
space that correspond to the orientations of the crossing lines. Overlapping
objects in 2-D images become disjoint in 3-D orientation space. A simple
labeling operation allows disentangling of overlapping objects.
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