Reference Manual

Print2CAD 2018 x64 Artificial Intelligence

Vectorization 1:

Center Line Tracing Method and Outline Method

German
Vectorization 1:  Center Line Tracing Method and Outline Method

Supported Methods for Vectorization of Raster Pictures

Print2CAD offers four methods for tracing bitmaps: Centerline Trace, Outline Trace, Combination of Centerline Trace and Outline Trace, and Solidization.

Center Line Tracing
Outline Tracing

Center Line Tracing

Outline Tracing

Combination of center line and outline tracing
Solidization

Combination of Center Line and Outline Tracing

Solidization

Before the application of these methods, the program is using a presorting of raster image pixel areas. Small pixel traces, middle pixel traces, long pixel traces, and field pixel areas, are separated from other raster images and individually and independently vectorized with appropriate parameters and methods. The name of this method is “homogenization of raster images.”

Original
Long Pixel Traces
Pixel Area

Original

Long Pixel Traces

Pixel Area

Middle Pixel Traces
Small Pixel Traces

Middle Pixel Traces

Small Pixel Traces

Vectorization Method 1: Center Line Tracing Method

Center Line Tracing of raster picture structures in PDF images is an essential tool for the construction of geometrical representation of a raster picture in CAD files. The Center Line Tracing method uses unfilled closed and open curves (strokes) and is suitable for tracing technical illustrations, maps, line drawings, and signatures.  This method is also referred to as “stroke tracing.”

Center Line Tracing Method
Center Line Tracing Method

Vectorization Method 2: Outline Tracing Method

When selecting this option, the outlines of the pixel traces and areas will be converted along the boundary line and smoothed automatically. The Outline Trace method uses curved objects with no outlines and is suitable for tracing clip-art, logos, and photo images. The Outline Trace method is also referred to as “fill” or “contour tracing.” The Outline Trace method offers the following preset styles that are suitable for line art, logos, clip-art, and photo images.

Outline Tracing Method

Vectorization Method 3: Center Line Tracing and Outline Tracing Method Combination

When selecting this option, the outline or solid method will be used for small and middle pixel traces areas. The long pixel traces will be used in the center line tracing method. The huge pixel areas will be used in the outline method.

Center Line Tracing and Outline Tracing Method Combination

Option: Vectorize Medium Details Using Separate Method

The medium details will be vectorized separately using the method of Outline Tracing or Solid Hatch Creation (Solidization).

Vectorize Medium Details Using Separate Method

Option: Vectorize Small Details Using Separate Method

The small details will be vectorized separately using the method of Center Line Tracing or Solid Hatch Creation (Solidization).

Vectorize Small Details Using Separate Method

Close Open Pixel Traces

Often older scanned drawings will contain open pixel traces. This setting will prompt the program to close these open spaces. Under “Vectorization 4” the user can select the distance between pixels as Parameter Gap Jump.

Close Open Pixel Traces

Cleanup of Free Pixels

Often older scanned drawings will have free pixels. Selecting this feature will ensure the removal of these unwanted pixels, for a cleaner converted file.

Cleanup of Free Pixels

Repair Raster Pictures using Blurring

A good method to repair bad quality scanned images is to blur these images and then convert them into black/white images using the threshold. By blurring, the free pixels are removed, and the holes in the pixel traces are closed.

Repair Raster Pictures using Blurring
Repair Raster Pictures using Blurring

Original

After Blurring before Vectorization

Double Resolution During Vectorization

The image is vectorized in double resolution. Thus, the small details are better recognized. However, the vectorization time increases significantly, and the vectorization of larger details is of poor quality.

Straight Line Recognition

The horizontal, vertical, and 45 Degrees lines are recognized. This recognition is possible only for Center Line Tracing Method.

Circles and Arcs Recognition

Detection of circles and arcs occurs when a closed polyline fits the parameters required of an arc or circle.

Assign Chromatic Colors to Layers

This setting assigns a separate color to entities from different layers. This way the user can better see the layer separation on the screen.

Assign chromatic Colors to Layers

Enhanced Recognition of Walls in Scans

The program tries to find separate vector and hatch areas from in common pixel traces. If these areas are recognized as Walls they will be vectorized using outline tracing or as solid.

 

Original Raster Image in PDF
Recognized Walls in DWG

Original Raster Image in PDF

Recognized Walls in DWG

Fill Small Holes in Pixel Traces

This setting fills the small holes in the pixel traces.

Fill Small Holes in Pixel Traces

Fill all Holes in Pixel Traces

This setting allows all holes in the pixel traces to be filled.

Fill all Holes in Pixel Traces

Thicken Pixel Traces

This setting will add a layer of pixels to the outer edge of the pixel trace.

Thicken Pixel Traces

Thin the Pixel Traces

This setting removes one layer of pixels from the outer edge of the pixel trace.

Thin the Pixel Traces

BacktoCAD Technologies, LLC

601 Cleveland St, Suite 310

Clearwater, FL 33755, USA

 

Email: bc-sales@cad-pdf.com
Phone: (727) 303 0383

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