Method of embedding watermark into digital image

Details Method of embedding watermark into digital image Method of embedding watermark into digital image

2006-06-06

2006-06-06

Wu, Jingge (Department: 2623)

Image analysis

Applications

Reexamination Certificate

active

07058201

ABSTRACT:
Methods of embedding and detecting a watermark into/from a digital image are disclosed. A method of embedding a watermark in accordance with the present invention includes generating a predicted image of an original image by using a linear predictor; generating a difference image by subtracting said predicted image from said original image or vice versa; and segmenting said difference image into sub-regions. The method further includes the steps of calculating a watermark amplitude for each sub-region or for each pixel of each sub-region; performing a channel coding process on a set of watermark data bits; calculating a watermark block for each sub-region by using said encoded data bits, a pseudo random sequence (PRS) and said watermark amplitude; and embedding said watermark block into each sub-region by adding said watermark block with pixel values of each sub-region. As a result of the method described, the embedded information is robust against any modifications including loss data compression, filtering, channel noise, cropping, geometrical transformations, and etc.

REFERENCES:
patent: 5809139 (1998-09-01), Girod et al.
patent: 6404926 (2002-06-01), Miyahara et al.
Wolfgang et al. “Overview of Image Security Techniques With Applications In Multimedia Systems” SPIE vol. 3228, pp. 297-308.
Bender et al. “Techniques for Data Hiding” IBM Systems Journal, vol. 35, Nos. 3&4, pp. 313-336.

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