Electronic watermark embedding device, electronic watermark...

Details Electronic watermark embedding device, electronic watermark... Electronic watermark embedding device, electronic watermark...

2005-01-31

2009-02-10

Ahmed, Samir A (Department: 2624)

Image analysis

Applications

C382S232000, C713S176000

Reexamination Certificate

active

07489796

ABSTRACT:
A digital watermark embedding apparatus for embedding digital watermark information by superimposing macroblock patterns on an image is disclosed. The digital watermark embedding apparatus: spreads input digital watermark information to obtain an embedding series having a length corresponding to a number of pixel blocks of a macroblock pattern; selects 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 sets a waveform pattern corresponding to the selected frequency as a pixel of the pixel block; and amplifies, 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 superimposes the macroblock pattern on an input image like a tile.

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U.S. Appl. No. 10/548,755, filed Sep. 8, 2005, Nakamura, et al.
U.S. Appl. No. 10/548,672, filed Sep. 8, 2005, Nakamura, et al.

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