Patent ID: 7489796

Claim:
A digital watermark embedding apparatus for embedding digital watermark information by superimposing macroblock patterns on an image, the digital watermark embedding apparatus comprising: a digital watermark information spreading unit for spreading input digital watermark information to obtain an embedding series having a length corresponding to a number of pixel blocks of a macroblock pattern; a waveform pattern setting unit for selecting at least a frequency from among predetermined plural frequencies according to a term value of the embedding series corresponding to a position of a pixel block in the macroblock pattern, and setting a waveform pattern corresponding to the selected frequency as a pixel of the pixel block; and a macroblock pattern superimposing unit for amplifying, with an embedding strength value, the macroblock pattern on which a waveform pattern is superimposed on each pixel block by the waveform pattern setting unit, and superimposing the macroblock pattern on an input image like a tile.