Reference Manual

Print2CAD 2019, Artificial Intelligence

AI Function 3:
Enhanced Line Type Recognition

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AI Function 3: Enhanced Line Type Recognition

Enhanced Recognition of Line Types and Line Patterns

The possibility to define a line with line types in PDF files exist. However, it is rarely used because of the risk that line types can appear inaccurate in the PDF. Almost all PDF interfaces in CAD systems create a static copy of the line using small single dashes.

With the help of special artificial intelligence functions Print2CAD can recognize most of the fragmented lines. The small dashes can be bounded to the common line with the line type style “Dashed”.

With the automatic recognition, there can still be some errors. To minimize the number of errors, the user can also mark the line type areas using the internal tool under “Artificial Intelligence Functions”.


Parameter: Minimum and Maximum Pattern Length

The pattern length is the most important information for correct line type recognition. The pattern is defined as the length in a Print2CAD unit (see “Configuration”) of a repeated sequence of dashes and space between it. The minimum Patten length will be 10% of the given maximum pattern length.

Parameter: Minimum and Maximum Pattern Length

Parameter: Minimum Number of Dashes (Min. Pattern Number)

The line type will be assigned to the line only if the recognition finds the minimum number of pattern. The optimal minimum number of dashes shall be greater than 2. The optimal minimum number of dashes is 4.


Parameter: Tolerance

At the ends of small dashes, the program will try to bind to a common line that is usually not on a straight line. The tolerance gives information about the maximum distance from the beginning of the end of a dash and the hypothetical straight line.

Parameter: Tolerance

Line Type Areas

The enhanced line type recognition works only if the right direction of small dashes can be detected. Unfortunately, in one construction plan the small dashes can exist in very different directions and on different places.

A manual preseparation of the line type areas with a common direction is needed for well-done line type recognition.

Print2CAD offers a special editor for the line type areas.

One “Line Type Area” will be defined with the help of 2 points - the beginning and the end of the reconstructed line with a line type.

- The Beginning and the End of a Line Type Area doesn't need to be the Beginning or the End of a reconstructed line. The "Line Type Area" has only to cover
   all dashes and points belonging to the line type.
- Try to separate clean Line Type Areas with no disruption from other drawing elements.
- A thorough selection of the Line Type Areas vastly improves the quality of the line type recognition.

Line Type Areas

Line Type Area Editor allows the program to move, change, and delete the line type areas.

Line Type Area Editor allows the program to zoom any part of a drawing.


BacktoCAD Technologies, LLC

601 Cleveland St, Suite 310

Clearwater, FL 33755, USA


Phone: (727) 303 0383

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