Image analysis – Applications
Reexamination Certificate
2006-12-19
2006-12-19
Johns, Andrew W. (Department: 2624)
Image analysis
Applications
C382S250000
Reexamination Certificate
active
07151842
ABSTRACT:
A watermark and extracting method and a watermark hardware structure used in an image compression system. A series of data is generated by random variables, such that duplication is avoided. According to characteristics of the human vision system, weighted value of each block is analyzed by classification in the frequency domain. According to the specific weighted value for each block, a watermark intensity is embedded, such that the embedded watermark is not easily observed, while the robustness is retained. Therefore, the original figure is not required for extraction. In addition, the watermark embedding hardware structure can be incorporated in a joint photographic experts group (JPEG) system, so that the image itself contains the watermark data while being intercepted.
REFERENCES:
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Dugad et al., “A Scheme for Joint Watermarking and Compression of Video,” IEEE Proc. 2000 Int. Conf. on Image Processing, vol. II, Sep. 2000, pp. 80-83.
Wong et al., “A Data Hiding Technique in JPEG Compressed Domain,” Proc. SPIE vol. 4314: Security and Watermarking of Multimedia Contents III, Jan. 2001, pp. 309-319.
Choi et al., “Watermarking Using Inter-Block Correlation: Extension to JPEG Coded Domain,” IEICE Trans. Fundamentals, vol. E84-A, No. 3, Mar. 2001, pp. 893-897.
Fridrich et al., “Invertible Authentication Watermark for JPEG Images,” IEEE Proc. Int. Conf. on Information Technology: Coding and Computing, Apr. 2001, pp. 223-227.
Lu Chorun-Yi
Tsai Tsung-Han
J.C. Patents
Johns Andrew W.
National Central University
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