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When Uncertain Characters is enabled, the imager will decode
OCR strings and include characters that the algorithm is unable to
identify.
Uncertain characters are issued as a group,
starting with ASCII value 29 (Group Separator), followed by zero or
more ASCII characters (the first being the most likely, followed by
decreasingly likely characters). The group is terminated by another
Group Separator character. If there are no characters between a
pair of Group Separator characters, then no possible character for
that position was determined. Counting each uncertain group as a
single character, the total number of characters output will match
the length of the "winning" OCR template.
Important: This parameter only affects the internal
passport template. It is ignored by all other OCR templates.
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