Specifications
Print2CAD OCR 2013 - 60
7.6 Generate Circles and Arcs
Many PDF les contain circles and arcs that have been converted into polylines. These
polylines tend to be imprecise making it difcult to detect them as a circle or arc.
Although the recognition of a polyline as a circle or arc appears to be easy when one
looks at a PDF (a person can immediately recognize the circle or arc), software has to
work a little harder to do this.
Figure: Circle in Polyline Segments
Many internal parameters were set, but there
is no need to disclose all of my secrets! The
recognition process works well in providing
true circles. If this is not the case with your le
then it was because of the lack of polylines, but
rather the presence of a chain of line segments.
The user can set one parameter, which is the
deviation of the polyline vertexes from the
radius of the circle. The parameter is set in %
of the radius formula.
For this you must use your intuition and ex-
perience to determine what the best parameter
may be for the specic le.