Fujitsu ScanSnap fi-5110EOX Operator's Manual page 75

4. Click the [OK] button to close the window.
The setting is enabled from next scanning.
Up to +-5 degrees of skews can be corrected.
ATTENTION
This function judges a document skew based on the characters printed on the
document, so it may not work properly for the following document:
Documents on which the pitches of lines or characters are extremely narrow,
or characters are overlapped
Documents with many outline characters or characters like this style
Documents with many photographs or figures and only a few characters
Documents with a background pattern behind characters
Documents on which characters are printed in various direction (e.g. plans,
etc.)
Documents with long diagonal lines
Documents with handwritten characters
*When you scan such documents, unmark the checkbox.
3.5 Various settings according to your needs
3