9.3 Set Image Processing Filters
The image processing will be applied to all images before recognition. As far as the operation is concerned, this means setting three filters:
Edge Filters;
Threshold Filters; and
Clean-Up Filters.
In Figure 9.3,
-
to select an Edge Filter, click the Edge Filter Drop Down List, which is the first List in the red box;
-
to select a Threshold Filter, click the Threshold Filter Drop Down List, which is the second List;
-
to select a Clean-Up Filter, click the Clean-Up Filter Drop Down List, which is the third List.
The Edge Filters attempt to exaggerate the main features a user is looking for.
The Threshold Filters attempt to suppress the background.
The Clean-Up Filters will smooth the resulting image to reduce recognition error.
The default setting in the ImageFinder is:
Edge Filter = 2
Threshold Filter = 1
Clean-Up Filter = 2
The code for the three Drop Down Lists is:
private void comboBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
f.ip70.setEdgeFilter (comboBox1.SelectedIndex);
f.richTextBox1.AppendText ( "Set EdgeFilter " +f.ip70.getEdgeFilter () + ".\n" ) ;
}
private void comboBox2_SelectedIndexChanged(object sender, System.EventArgs e)
{
f.ip70.setThresholdFilter (comboBox2.SelectedIndex );
f.richTextBox1.AppendText ( "Set ThresholdFilter " +comboBox2.SelectedIndex + ".\n" );
}
private void comboBox3_SelectedIndexChanged(object sender, System.EventArgs e)
{
f.ip70.setCleanUpFilter ( comboBox3.SelectedIndex );
f.richTextBox1.AppendText ( "Set CleanUpFilter " +comboBox3.SelectedIndex + ".\n" );
}
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