I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 53)

Section 5: Selecting the Recognition Options
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Tip: should the recognition results be unsatisfactory, even though you
selected the correct recognition options, then the image quality of your
documents is probably insufficient. See the section Adjusting the Image
Quality to solve this problem.
A
DVANCED
R
ECOGNITION
O
PTIONS
Next to the document language, other document characteristics such
as the Font type and Character pitch play an important role in the
processing of documents.
You can access them by clicking the expansion arrow in the
Configuration group, or via the Readiris button > Advanced
Settings.