October 2013
Beginner to intermediate
350 pages
13h 7m
English
Content preview from Feature Extraction and Image Processing
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6
217
Flexible shape extraction
(snakes and other
techniques)
6.1 Overview
The previous chapter covered finding shapes by matching. This implies knowledge of a
model (mathematical or template) of the target shape (feature). The shape is fixed in that
it is flexible only in terms of the parameters that define the shape, or the parameters that
define a template’s appearance. Sometimes, however, it is not possible to model a shape
with sufficient accuracy, or to provide a template of the target as needed for the GHT. It
might be that the exact shape is unknown or it might be that the perturbation of that shape
is impossible to parameterise. In this case, we ...
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