I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 45)

Readiris TM Corporate 12 – User Guide
39
Drawing polygons
Zoning documents manually is not limited to rectangular shapes.
You can create polygonal zones by merging rectangular ones.
Whenever two zones of the same type intersect, they become a
polygon automatically.
Automatic page analysis
Should the current page be too complex to zone manually, click the
Analyze page button on the image toolbar to zone the page
automatically.
Note that barcode zones and handprinting zones always need to be
drawn manually.