I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 126)

Readiris TM 14 – User Guide
121
If Readiris does not detect your image is a digital camera
image:
 Ctrl-click the page thumbnail.
 Select Digital Camera Image.
Deskewing Digital Camera Images
When photographing documents with a digital camera, it may
happen that the documents are shot from an angle, which gives
them a 3D effect and renders the recognition impossible.
To solve this issue, you can deskew your digital camera images:
 Open your digital camera image.
 On the Layout and Editing toolbar, click the Deskew icon.