May 1993 MSC Thesis at the University of Calgary
by Cullen Jennings
by Cullen Jennings
Modern maps and engineering diagrams are usually
constructed and stored using GIS or CAD systems. A large number of drawings,
however, exists only in a paper form. This thesis examines the problem of
automatically converting such drawings and maps from raster image to high
quality vector GIS or CAD forms.
constructed and stored using GIS or CAD systems. A large number of drawings,
however, exists only in a paper form. This thesis examines the problem of
automatically converting such drawings and maps from raster image to high
quality vector GIS or CAD forms.
This
thesis begins with a review of previous work in the area and then proposes a new
method based on findings about how human vision works and domain specific
knowledge. Another system based on the classical work in this area is presented,
to which the new system is compared. This comparison shows that the method
proposed here obtains substantially better results than classical methods. The
time a human operator could expect to spend correcting the errors created by
this system would be less than one tenth of the time required to correct the
errors created by a classical vectorization
system.
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