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OCR Reads Scored Above the Acceptance Threshold but Failed

Fix for OCR tool issue found on Wafer ID products

14/09/2024

Details

Event:

Attempt to read SEMI OCR fails despite the score exceeding the accept threshold.

Probable Causes:

  • Any of the OCR characters are below the Character Threshold.
  • A SEMI checksum is not added to OCR character, but "SEMI" or "SEMI with Virtual" is specified for the checksum. 

Solution:

  • Look at the score for every character in OCR and if any of them is below the "Character Threshold" then lower the "Character Threshold" value below that character's score.
  • Try setting the checksum to "Virtual".