I am working on to the alfresco 4.2 community addition.now i have to use the some kind of Scanning feature to scan the hard copy of the document and upload.
I have googled but haven't found any good solution.
In addition to @zladuric:s answer I would like to add that there are software like Ephesoft and Kofax that for example can aid in the extraction of metadata from the scanned documents.