Image data output processing apparatus and image data output processing method excelling in similarity determination of duplex document

摘要

In an image data output processing apparatus of the present invention, a storage process section, when a reference document is duplex, stores, at the time of storage, a DocID indicative of the reference document, to correspond to an ID indicative of respective document images on front and back sides of the reference document, and in matching when a matching document is duplex, extracts an ID similar to that of the reference document and a corresponding DocID for each of the document images on the front and back sides of the matching document, to create candidate lists for the front and back sides of the matching document. If first candidates in the candidate lists correspond to an identical DocID, the images are similar to each other, and if first candidates do not correspond to the identical DocID, a determination result is corrected to a reference document corresponding to the identical DocID.