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Fig. 154: Figure 122: Segmentation with value 15% for parameter: “Max deviation from base line”: Only the
inner five characters are segmented.
Fig. 155: Figure 123: Segmentation with value 25% for parameter “Max deviation from base line”: All
characters are segmented.
4.6.3.12.1.4 Classification
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In this step a suitable character set „font“ is selected. Each font is available with different character
sets. Goal is to choose the font with the most stable results for the application.
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Naming of fonts by the example of group „Industrial“:
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- „Industrial_0-9“: all numbers
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- „Industrial_0-9+“: all numbers and special characters
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- „Industrial_A-Z+“: all capital letters and special characters
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- „Industrial_0-9A-Z“: all numbers and capital letters
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- “Industrial.omc“: all characters
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Reference string has two functions:
1. Manipulation of classification (of the recognized characters):
For each segmented character a rating value (confidence), in relation to each in the whole set of
characters (font) available character is calculated.
If reference string is not used, the character with the highest rating value (confidence) is the
winner. By use of reference string the "N" best alternatives will be considered (No. of
alternatives). Maximum number of allowed character changes which did not have the maximum
rating value (confidence) is specified in: “No. of corrections”.
2. Manipulation of detector result:
A minimum quality for complete string is specified (Threshold). If quality is below the threshold,
detector result will be "false".
4.6.3.12.1.5 Quality
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If quality of one of the classified characters is below “Minimum confidence”, the detector result will be
"false".
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Low confidence shows, that a character was not classified reliably. High confidence value however, is
not a guarantee for reliable classification!
4.6.3.12.2 Detector OCR, tab Character (flexible)
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