I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 144)

Readiris TM 14 – User Guide
151
Important note: Readiris automatically recognizes barcodes to
separate documents, but the barcodes zones themselves are not
recognized as barcodes. In most case, they are recognized as
images.
Recognizing barcodes manually:

Scan or Open your document.

Click the Zones tab.

Click the Barcode icon and draw a frame around the barcode.