Importance

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Abstract

A method is described which compares contents-rich documents page by page and creates a difference document of paired pages. The pages are compared, in that order, based on their marking operators, on bitmaps rendered from the still unpaired pages, and on a subset of the bitmap, e.g. in smaller page areas. Pages that are visually identical are paired. Blank pages are inserted if pages cannot be paired to deal with page insertions and deletions. Differences between pages which can be visible in a printed document, are marked on the paired pages. The method can be used with documents that contain embedded graphical contents as well as with plain text files.

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First Claim