Patent ID: 6768807
Filing Date: 2004-07-27
Classification: G06T

Abstract:
A digital watermark embedding device by which digital data is assumed to be an embedding target and the digital watermark is embedded, comprising:average value calculation means to set said embedding target to be a unit averaging block which calculates an average of the averaging block In which said embedding target includes more than two adjacent basic units of each base which constructs the plurality of basic units, and calculate an average of the plurality of basic units at every said averaging block; data shift means to shift basic value of each said plurality basic units which belong to said averaging block by calculating a difference of each averaging block with the average value of basic value of each said plurality basic units which belong to the averaging block and the corresponding averaging block; spread spectrum means to perform a spread spectrum of the embedding target to which the value is shifted by said data shift means; and watermark embedding means to embed a digital watermark in the embedding target to which the spread spectrum Is performed by said spread spectrum means.