ELECTRONIC WATERMARK SYNCHRONIZATION RECOVERY APPARATUS AND ELECTRONIC WATERMARK SYNCHRONIZATION RECOVERY PROGRAM

摘要

In an electronic watermark synchronization recovery apparatus, a geometric parameter calculation unit (7) calculates a geometric parameter representing a geometric change of a document occurring in a communication path. A reference point position correction unit (8) uses the geometric parameter calculated by the geometric parameter calculation unit (7) to convert a temporal coordinate axis to a coordinate axis used when a reference point is embedded, and corrects a plurality of reference point positions calculated by a reference point position calculation unit (5).