Image analysis – Applications
Reexamination Certificate
2007-10-09
2007-10-09
Johns, Andrew W. (Department: 2624)
Image analysis
Applications
C382S240000, C382S250000, C713S176000, C380S046000
Reexamination Certificate
active
10380389
ABSTRACT:
The present invention relates to a digital image watermarking apparatus and method. Luminance component of a digital image are transformed into coefficients of a frequency domain, and watermark is generated by encrypting a user key and generating pseudo random number from encrypted user key. Then, a replacement coefficient generated from a coefficient of a first frequency area and the watermark is replaced with a coefficient of a second frequency area so that the watermark is embedded into the digital image. The embedded watermark is extracted at an authenticating apparatus and the digital image is authenticated by finding the correlation between the extracted watermark and watermark for authentication.
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Choi Jong-Uk
Lee Jung-Su
Blakely & Sokoloff, Taylor & Zafman
De Klerk Stephen M.
Johns Andrew W.
Mackowey Anthony
Markany Inc.
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