Autodesk 00126-050008-1620A - Autocad 2006 Essentials User Manual page 192

WiseImage – User's Guide
determined by the Approximating parameter. The lower this value, the larger the
deviation can be.
Arcs and Circles
Turns on the algorithm for recognizing raster circles and arcs.
There are the following additional parameters:
If this option is on, then WiseImage searches for raster analogues of
Arrows
dimension arcs (arcs with one or two arrows at the endpoints) and, if
the arrows are found, creates appropriate AutoCAD dimension
objects (DIMENSION).
Line Types If this option is on, then WiseImage recognizes dashed and dash-
dotted straight lines, creating vector segments with the
corresponding line type.
This algorithm is influenced by the following options of the Options tab:
It recognizes raster circles and arcs with length greater than the value of the Min
length parameter and with width less than the value of the Max width parameter.
The Max break parameter sets the maximum length of ignored raster segment
break.
The Approximation parameter sets the accuracy of raster segments approximated
by vector objects. If the raster quality is poor, you need to reduce this parameter so
that the algorithm can recognize raster objects with significant form distortions.
Polylines
This algorithm approximates central lines of raster objects by polylines
(POLYLINE). The algorithm creates polylines consisting of straight segments only.
You can use this algorithm individually (or with the Outlines algorithm) for
vectorization of maps and other images consisting of arbitrary lines (curves drawn
by hand).
There are the following additional parameters:
Line Types
Create vertices
on intersections
This algorithm is influenced by the several options of the Options tab. Max length
defines the maximum length of a recognized segment that will be added to the
198
The figure shows the results of vectorization with
using Lines and Arcs and Circles. The original
raster fragment is shown on the left; the figure
on the right represents the vectorization results
when object width display is off.
If this option is on, then WiseImage recognizes dashed and
dash-dotted arcs and circles, creating vector objects with the
corresponding line types.
If this option is on, the algorithm creates vertices on polyline
intersections.