Autodesk 05726-091452-9060 User Guide - Page 195

13 Vectorization 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 ( or ). 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 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. Max Width 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. 201