Image analysis – Applications
Reexamination Certificate
2006-08-15
2006-08-15
Wu, Jingge (Department: 2621)
Image analysis
Applications
Reexamination Certificate
active
07092545
ABSTRACT:
In an apparatus for embedding digital watermarks into an image, a watermark embedding region extraction unit extracts an image region to contain watermarks from a wavelet transformed entire image. A watermark generation unit generates a watermark data row to be embedded according to a user's private key. A normalization operation unit normalizes the quantized data value by using a quantization unit into a normalized data value. An inverse quantization inversely quantizes and outputs the normalized data value. A watermark embedment unit embeds a watermark-embedded data value as a corresponding pixel data value into the watermark embedding region, wherein the watermark-embedded data value is obtained by subtracting, from the inversely quantized data value, the watermark data value added prior to the quantization.
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Brian Chen and Gregory W. Wornell, “Quantization Index Modulation: A Class of Provably Good Methods for Digital Watermarking and Information Embedding”, IEEE Transaction on Information Theory, vol. 47, No. 4, May 2001, pp. 1423-1443.
Joo Sanghyun
Oh Weon Geun
Seo Yong-Seok
Electronics and Telecommunications Research Institute
Lu Tom Y.
Mayer, Brown, Rowe and Maw LLP
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