Patent Document ID: 8693028
Application ID: 12472141

Base Claim:
1. An image processing apparatus that extracts a difference between documents, the image processing apparatus comprising: a comparing unit configured to compare vector data of a target document with vector data of a stored document stored in the image processing apparatus to determine whether there is a first difference between the vector data of the target document and the vector data of the stored document, wherein both of the vector data of the target document and the vector data of the stored document are resolution-independent drawing data in binary format; a converting unit configured to, when said comparing unit determines that there is the first difference between the vector data of the target document and the vector data of the stored document, convert the vector data of the target document into first text data and convert the vector data of the stored document into second text data; a difference data generating unit configured to compare first text data converted from the vector data of the target document with the second text data converted from the vector data of the stored document to generate second difference data in a text format between the first text data and the second text data; and a linking unit configured to link the second difference data generated by the difference data generating unit with the stored document.

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Claim 4:
4. The image processing apparatus according to claim 1 , wherein the vector data is generated based on a page description language describing a document.