I.R.I.S. Readiris Corporate 12 for Windows User Guide - Manual (Page 54)

Chapter 8 – Windowing documents
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 Draw a frame around the text blocks, graphics, tables, barcodes
and handprinting zones you want to window.
For more information on recognizing barcodes and handprinting, see
the sections Recognizing barcodes and Recognizing handprinted
text, respectively.
 When you are done windowing the document, click the
Recognize + Save button to execute the OCR.
Sorting windows
To change the sort order of windows, click the Sort button on the
image toolbar and click the windows one by one in the required
order.
When you are done, click the Recognize + Save button to execute
the OCR.
Windows you do not click, will be excluded from recognition.
Drawing polygons
Windowing documents manually is not limited to rectangular
shapes. You can create polygonal windows by merging rectangular