Working with raster symbols

Brief description: The new algorithm of WiseImage allows you to recognize, select and vectorize not only raster entities such as lines, arcs, circles, and others, but also raster symbols. For example, units of electric and technology schemes, labels of windows, staircases, sanitary equipment on premises plans, and more.
Raster symbols are recognized in accordance with patterns stored in special template libraries. A raster symbol can be rotated and have a different scale. You can train the program to recognize new symbols. Before selecting, tracing, and vectorizing a raster symbol, you need to include the corresponding template in the Symbols tab of the R2V Conversion Options dialog.

Training to recognize symbols


  1. To recognize a raster symbol you need to create the corresponding vector template. This can be performed using vectorization, tracing, or simply by drawing vector objects over the raster symbol.
    INFORMATION: You can group vector objects to a block and use this block as a template.
  2. Save the template in a special library.
Raster symbol
Vector template
  • Select the vector template.
    Information on vector selection is provided in section Object selection methods of vector and raster data.
  • Choose Train Symbol from the Convert menu.
  • If the symbol has connection lines specify them with the Select connection lines button of the Train Symbols dialog.
    Connection line     - line of variable length, with which a symbol is connected to other objects. Set a corresponding name for further convenient use.
  • Save the symbol using the Save As button of the Train Symbols dialog.

 
Connecting lines
INFORMATION: The location of the root folder for storing templates is defined with the Preferences dialog. As each template is stored in a separate file, it is wise to group symbols files into sets of subfolders.

Tuning Symbol Recognition Options

The parameters of selecting, tracing and automatic vectorizing of raster symbols are set in the Recognition and Symbols tabs of the R2V Conversion Options dialog.

Choose Conversion Options from the Convert menu.

  • Open the Recognition tab and select the Symbols checkbox.
  • Open the Symbols tab.
Select the checkboxes of the required categories (includes all symbols of category) or standalone symbols.

Strategy - this parameter influences the speed and quality of symbol recognition. Set Standard or Smart.
Accuracy - this parameter defines acceptable deviation of the raster symbol from the template. Use a higher accuracy value for raster images of good quality, lower - for images of poor quality.

Fixed Scale - if the Fixed Scale checkbox is on, only those raster symbols, which size coincide with the size of corresponding templates or different from them by specified scale factor are recognized.
If the Fixed Scale checkbox is off, raster symbols of different scale will be recognized.

Orientation - specifies the raster symbol orientation relative to the templates’ orientation (choose Horizontal, Horizontal and Vertical or Arbitrarily oriented).

Standalone Symbols - select this checkbox, if you have only standalone symbols on your image.

Selecting, Tracing, and Vectorizing Raster Symbols

Selecting raster symbols

  1. Tune the symbol recognition options.
2. Set raster (hybrid) type of selected data.
3. Press the Select Raster Symbol button on the Select toolbar.
  4. Specify a point inside the raster symbol to select.
TIPS: It is recommended that you click a point near the geometric centre of the symbol.
  More detailed Information is provided in section Selection.

Tracing raster symbols

  1. Tune the symbol recognition options.
  2. Choose a tracing mode.
Information on tracing modes is provided in section Tracind Modes and Commands.
3. Press the Trace Symbol button on the Raster to Vector toolbar.
  4. Specify a point inside the raster symbol to select.
TIPS: It is recommended that you click a point near the geometric centre of the symbol.
  More detailed Information is provided in section Tracing.

Vectorizing raster symbols

  1. Tune the symbol recognition options.
  2. If you have several images in your document, select the one(s) to vectorize.
You can also select an image fragment or image clip to vectorize.
3. Choose Raster2Vector from the Conversion menu.

 

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