Image analysis – Applications
Reexamination Certificate
2009-11-13
2010-12-28
Tucker, Wes (Department: 2624)
Image analysis
Applications
C382S181000, C382S232000, C382S280000
Reexamination Certificate
active
07860270
ABSTRACT:
A method for embedding a watermark into digital data by independently changing real and imaginary number components of the coefficient values of a complex watermark coefficient matrix using a key, performing a discrete Fourier inverse transform on the sequence matrix of the changed watermark and generating a watermark pattern, adding like tiling the water mark pattern to the original image, and generating an embedded image. A watermark detection method includes separating a block from an arbitrary position on the detected object image, performing a discrete Fourier transform on the block and obtaining a sequence matrix, generating position information for a component which is to be detected and is specified by the key, detecting a position marker sequence by calculating a phase difference of a sequence by a parallel displacement, for the position information, extracting offset information, and detecting the embedded watermark from the detected object image.
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Nakamura Takao
Ogawa Hiroshi
Takashima Youichi
Tomioka Atsuki
Kenyon & Kenyon LLP
Nippon Telegraph and Telephone Corporation
Tucker Wes
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