It is often true that a user of computer images is interested in only a
few kinds of features. In particular, in a class of pictures called line
images, the major feature is a line or vector. Raster representations
of line images, while common, are quite wasteful of storage and are
difficult to manipulate. If the vectors could be extracted reliably
from the raster image, then rotation, scaling, plotting, and many
other operations could be speeded up enormously.
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