Nippon Telegraph and Telephone Corporation

Atushi Katayama

Takao Nakamura

Susumu Yamamoto

Ryo Kitahara

Takashi Miyatake

Hisato Miyachi

Masashi Yamamuro

A digital watermark embedding method of the present invention includes: a step of sequentially obtaining each frame image of the moving image data and frame display time; a step of generating a watermark pattern using watermark information, the frame display time and watermark pattern switching information; a step of superimposing the watermark pattern onto the frame image, and combining watermark embedded frame images obtained by sequentially repeating the processes to generate watermark embedded moving image data. A digital watermark detection method includes a step of sequentially obtaining a frame image; a step of generating a difference image between the currently obtained frame image and a previously obtained frame image; and a step of performing digital watermark detection from the difference image to output digital watermark detection status, and when digital watermark detection process is continued, obtaining a new frame again to repeat the above processes.

Digital watermark padding method, digital watermark padding device, digital watermark detecting method, digital watermark detecting device, and program

A digital watermark embedding apparatus of the present invention includes: a block dividing unit for dividing an input image into plural pixel blocks; a digital watermark information spreading unit for obtaining an embedding series having a length corresponding to a number of divided pixel blocks; a block-by-block embedding unit for selecting at least a frequency from predetermined plural frequencies according to a term value of the embedding series corresponding to a position of a pixel block in the image, amplifying amplitude of a waveform pattern corresponding to the selected frequency with an embedding strength value, and superimposing the waveform pattern in which the amplitude is amplified on the pixel block; and an image outputting unit for outputting an image on which a corresponding waveform pattern is superimposed on each pixel block by the block-by-block embedding unit.

Electronic watermark embedding device, electronic watermark detection device, method thereof, and program

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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Setagaya-ku, Japan

Atushi Katayama