I.R.I.S. Readiris Corporate 12 for Windows User Guide - Manual (Page 41)

Readiris TM Corporate 12 – User Guide
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High-speed and duplex scanning
When using a duplex scanner, the Duplex scanning option will
be available. Select it to recognize front and back pages.
Fast Binarization
Make sure to select Fast Binarization when you are using a
high-speed scanner. This option increases the processing speed
considerably. Avoid selecting this option when scanning very
low-quality documents, however.
 When you are done defining all the settings (Scanner settings,
Document type, Options), click Scan to scan documents.
Note: pay attention to line skew. Line skew over 0.5° increases the
risk of OCR errors.