Patent ID: 7099508

Claim:
A document identification device, comprising: document definition means for holding a plurality of pieces of document identification information; document size determination means for determining whether or not a sheet size matches a document size registered in the document definition means; corner cut determination means for determining whether or not a corner is cut within a specified corner cut area registered in the document definition means, given that the document size determination means determines that the sheet size matches the document size registered in the document definition means; binding hole determination means for determining whether or not a binding hole is opened within a specified binding hole area registered in the document definition means, given that the corner cut determination means determines that the binding hole is opened within the specified binding hole area registered in the document definition means; plane area determination means for making a determination, before checking a preprint, of whether or not a plane area lies within a specified plane area registered in the document definition means, given that the binding hole is opened within the specified binding hole; character existing area determination means for determining whether or not a character existing area is within a specified character existing area registered in the document definition means, given that the plane area is within the specified plane area registered in the document definition means; preprint area determination means for making a determination of whether or not the preprint is within a specified preprint area registered in the document definition means, given that the character existing area is within the specified character existing area registered in the document definition means; and means for determining that a document matches a predetermined document, given that the preprint is within the specified preprint area registered in the document definition means.