There is not a out of box report that will break this down by users.

You can use an Advanced search such as this below to identify the newly created documents by user in a location (Folder) in the Repository. Once you get back your search results, the number of returns will show in the header 

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I think one question would be how often are you looking for some type of a report.  Would you be looking for something daily?  Weekly?  Only as needed?

As long as your documents set the "entry owner" as the person who scanned, you could set up a workflow to run, search the repository, and use a for each loop to sort documents found by person in an email sent at the end of the workflow.