I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 147)

How to
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
Indicate which separation method you are going to use: Detect
blank pages or Detect cover pages with a barcode.
When you are using cover pages with barcodes, you can indicate
where exactly on the page the barcodes are located, by means of a
read zone. Once you have defined the read zone, Readiris will only
search for barcodes in that specific area.
Tip: in order to know the dimensions of the read zone, use the Coordinates
function in Readiris:

Click the Zones tab, and select Coordinates.