Lesson 9. Symbol Recognition in Automatic Vectorization
Brief description:
During
this lesson you will learn how to train WiseImage to recognize raster
symbols when vectorizing.
 For detailed information on these subject see Raster symbols section of the Quick Start guide.
Choose Open
from the File menu, and then open the Symbols.dwg file from the
Lesson_9 folder.
Our task is to recognize units of the electric scheme when vectorizing
- replacing them with the corresponding vector blocks.
You need to train the program to recognize raster symbols.
Training to recognize symbols
To recognise a raster symbol, you need to create a corresponding
vector template. In this example we are going to use the existing vector
blocks contained within the document as vector templates.
- Select the first vector block.
- Run the Train Symbol command from the rConvert menu.
- Press the Create Symbol from selection button
- the selected vector symbol will appear in the Train
Symbol dialog.
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- IMPORTANT! Specify the connection lines for the symbol
using the Select connection lines button
 . (Connection
lines are the lines of variable length, with which a symbol is
connected to other objects).
- Press the Save As button of the Train Symbol dialog.
- Save the template with the name elec_1.
INFORMATION: By default templates are stored in the
Shapes folder, located in the program
directory. You can create your own subfolders to save new symbols
in, e.g. for this exercise, create a subfolder called Training.
- Choose Create
in the AutoCAD command line (do not close the Train Symbol dialog).
- Select the next vector symbol.
- Press Enter
to complete the selection - the second selected block will appear
in the Train
Symbol dialog.
- Repeat this procedure for all symbols contained in the document
with the names - elec_2, elec_3, elec_4, elec_5, elec_6, and
elec_7.
- Close the Train
Symbol dialog.
Tuning vectorization parameters
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Choose Conversion Options from the rConvert menu. Note that the vectorization
parameters are already stored in the Symbols.dwg document file.
So, in this example we are only going to tune the symbol recognition.
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To turn on symbol recognition, do the following:
- In the Recognition tab of the R2V Conversion Options dialog select
the Symbols checkbox.
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- Open the Symbols tab of the R2V Conversion Options dialog.
- Select the checkbox for the newly created group of symbols Training, or for each individual symbol whose raster representation
is present on the image.
- Set Strategy - Standart or Smart.
- Set the Accuracy slider to the Low position.
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- Select Fixed
Scale, and set the scale equal to 1.
- In the Orientation field, specify Horizontal and Vertical.
- Press OK.
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Running vectorization
To run vectorization, choose Raster To Vector from the
rConvert
menu.
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Original raster drawing
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Result of vectorization with symbol recognition
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