Autodesk 00126-050008-1620A - Autocad 2006 Essentials User Manual page 195

These parameter values are entered in AutoCAD units. You can enter parameter
values from the keyboard or measure their values on the screen.
To measure parameters value on the screen
1. Click on the button near the appropriate input box in dialog (
2. Specify two points on the image.
During measurement the program draws a rubber line connecting the indicated
points. From here on we refer to the process of measurement on the image as
draw a line. When the measurement is completed, the value is shown in the
box.
Min Length
Max Width
Sets the minimum length of a raster fragment, which should be
recognized as a line, circle or arc in the vectorization process.
Specify the value of this parameter equal to the length of the
shortest raster line or diameter of the smallest raster circle (arc).
During the measurement on the image draw a line along the
smallest raster line, arc or circle. The value of Min Length will be
equal to the length of the line covering black (foreground) dots
on the raster line.
Sets maximum width of the raster object, which should be
recognized as a line, arc or polyline.
Specify the value of this parameter slightly greater, than the
maximum width of a raster line, which you want to vectorize
using the algorithms: Lines, Arc and Circles or Polylines.
If the program does not vectorize raster segments, circles, arcs
of the image, you should increase the value of this parameter. If
the program does not approximate flooded raster areas by
boundary objects, you should reduce the value of this
parameter.
To measure on the image, draw a line perpendicular to the
widest raster line, which you want to recognize using the
algorithm Lines or Arcs, or to approximate with the help of the
Polyline algorithm. This value will be equal to the length of the
drawn part of the line, which crosses the raster line.
13 Vectorization
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