I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 64)

Chapter 9 – Recognizing documents
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Use this command for damaged characters which could be confused
with other characters if learned. E.g. the number 1 and the letter I,
which have an identical form in many fonts.
o Click Delete to delete characters from the output.
Use this button to prevent document noise from appearing in the
output file.
o Click Undo to correct mistakes.
Readiris keeps track of the last 32 operations.
o Click Abort to abort interactive learning.
All learning results will be deleted. Next time you click Recognize
+ Save, interactive learning will start again.
U
SING FONT DICTIONARIES
When scanning many documents of the same type, font quality and
printing quality, you may not want to repeat the learning process
every time. Therefore, it is useful to use font dictionaries. Font
dictionaries contain font information learned during interactive
learning and can substantially increase the recognition results.
Note that font dictionaries are limited to 500 shapes. You are
recommended to create separate dictionaries for specific
applications.
To create a new font dictionary:
 On the Learn menu click the command New Font Dictionary.
Readiris will open the dictionary Readiris.dus by default. Change the
file name and click Save to save it as a new dictionary.
 Click Interactive Learning on the Learn menu to activate it.