Fujitsu ScanSnap S1500M Operator's Manual page 250

Target marked sections
Select [First marked section] to perform text recognition and set a keyword for the
PDF file only for the character strings in the first marked section, and [All marked
sections] for all marked sections.
Do not select [First marked section] when the text orientation of your document is
vertical.
The following explanation is for when you select [First marked section]:
Language
Select the language. Japanese, English, French, German, Italian, Spanish, Chinese
(simplified), Chinese (traditional), Korean, Russian, and Portuguese can be selected.
Target pages
Select [First page] to perform text recognition and set a keyword for the PDF file only
for the first page, and [All pages] for all pages.
4.
Click the [OK] button to close the ScanSnap setup dialog box.
5.
Load a document in the ScanSnap.
For details about how to load documents, refer to
Using the ScanSnap in Various Ways (for Windows Users)
Select this button to set a character string such as a title of a document as a
keyword for the PDF file.
Example: When only the title of a document is marked, the marked character
string is set as a keyword for the PDF file, and the PDF file becomes
searchable by the title character string.
When multiple marked sections exist in line, the marked character string closest
to the top of the document is set as a keyword.
Example: In the following case, the character string in marked section B, which is
higher than marked section A, is set as a keyword.
Marked section A
250
Marked section B
"How to Load Documents" (page 32).