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4.3 Optical character recognition with "Text-Genius" and "Text-Genius Plus" (SIMATIC MV440 only)
Such reading errors can be easily eliminated if you provide some information for more
reliable and consistent character recognition.
Go through the parameters of the OCR step in Programs/Template, starting with the "Read"
tab.
1. Select the following setting for ROI position when the decoder step is the first processing
step in the step sequence: "ROI1-oriented".
This means that the ROI of the OCR step follows the position of the data matrix code in
the current image and is always positioned just right for reading.
2. Character spacing:
In the example, the characters are printed very close, so you change the setting from
"Default" to "Narrow".
3. Characters occurring:
Restrict the alphabet your application uses to the characters that are actually used, i.e.
'()0123456789X "(can also be entered as: "()[ 0-9] X")
After saving these settings, the read result in "Adjustment - Set image" appears as follows:
]d201086912345678902113234246797654304935\x1D1708031810X2512110004935(01)08
691234567890(21)13234246797654304935(17)080318(10)X2512110004935
The plain text has now been read correctly with these settings.
Many more options are available on the other OCR tabs, with which you can provide more
information and make further adjustments to your application. To do this, use the information
about the parameters in the online help!
Note
Increasing read reliability and processing speed
If you are working with a Text-Genius Plus license and save the typeface as a user-defined
character font, you will improve read reliability and increase processing speed.
See also
OCR program steps (Page 187)
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
Image processing
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