Lesson 7-3. Tracing
raster symbols
Brief
description: During
this lesson you will learn how to trace raster symbols.
 For detailed information on these subject see Working with raster symbols section of the Quick Start guide.
Let’s study tracing raster symbols using Image_2 of the Trace.cws file from the
Lesson_7
folder.
| Raster symbols are recognized in accordance with patterns stored
in special template libraries. To recognise a raster symbol, you need
to create the corresponding vector template. This can be done through
vectorization, tracing, or simply by drawing vector objects over the
raster symbol. |
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In this example, vector templates have already
been created with automatic vectorization. Vector objects are grouped
in blocks.
Training the program to recognize symbols
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- Select the first vector symbol.
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- Start the Train Symbol command from the Convert menu. The selected
vector symbol appears in the field of the Train Symbol dialog.
- IMPORTANT!
Specify the connection lines with the Select connection lines
 button. (Connection lines are
lines of variable length, with which a symbol is connected to
other objects).
- Press the Save As button of the Train Symbol dialog.
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- Save the symbol template with the name - tech_1.
INFORMATION:
By default, templates are saved in the Shapes folder, located in the program
folder. To save new symbols, you can create a subfolder with the
name Technology, for example.
- Select the next vector symbol.
- Press the Create
Symbol from selection
button - the new symbol will appear in the Train
Symbol dialog.
- Repeat the same actions - train the program to recognize all
symbols contained in the image, assigning them the names tech_2, tech_3, tech_4.
- Close the Train
Symbol dialog.
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Tuning tracing parameters and tracing
- Choose Conversion
Options from the Convert menu.
- In the Recognition tab of the R2V Conversion Options dialog select
the checkbox next to Symbols.
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- Open the Symbols tab of the R2V Conversion Options dialog.
- Select the checkbox for the created group of symbols - Technology, or for each separate symbol presented in the scheme.
- Choose Strategy - Standard.
- Set the Accuracy slider in the Low position.
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- Select the Fixed Scale checkbox; set the scale equal to 1.
- Press OK.
- Open the Raster To Vector toolbar.
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- Choose a tracing mode - for example, Make Vector and Keep Raster
by pressing the button Make Vector and Keep Raster, and the tracing command - Trace
Symbol.
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- Click the scheme units on the raster image
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