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A pattern matching coding device for conducting coding of a unit pattern based on pattern matching with a library pattern, which device, as to a mark pattern determined to be matching, when the number of match error pixels of the pattern is not more than a prescribed value, codes, without coding the

A pattern matching coding device for conducting coding of a unit pattern based on pattern matching with a library pattern, which device, as to a mark pattern determined to be matching, when the number of match error pixels of the pattern is not more than a prescribed value, codes, without coding the bit map, an identification ID of a matching bit map in a library and an identification flag indicating that the number of match error pixels is not more than the prescribed value.

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A pattern matching coding device for conducting coding of a unit pattern based on pattern matching with a library pattern, which device, as to a mark pattern determined to be matching, when the number of match error pixels of the pattern is not more than a prescribed value, codes, without coding the

A pattern matching coding device for conducting coding of a unit pattern based on pattern matching with a library pattern, which device, as to a mark pattern determined to be matching, when the number of match error pixels of the pattern is not more than a prescribed value, codes, without coding the bit map, an identification ID of a matching bit map in a library and an identification flag indicating that the number of match error pixels is not more than the prescribed value. imization of Add-On Signals by Means of a Modified Training Algorithm for Linear Classifiers," IEEE Int'l Symp. On Info. Theory, Oct. 10, 1977, pp. 27-28. Szepanski, "Binary Data Transmission Over Video Channels with Very Low Amplitude Data Signals," Fernseh- und Kino-Technik, vol. 32, No. 7, Jul., 1978, pp. 251-256. (German text with full English translation). Szepanski, Additive Binary Data Transmission for Video Signals, Conference of the Communications Engineering Society, 1980, NTG Technical Reports, vol. 74, pp. 343-351. (German text with full English translation.). Gerzon, M.A., et al, "A High-Rate Buried-Data Channel for Audio CD," Journal of the Audio Engineering Society, vol. 43, No. 1-2, p. 3-22, Jan.-Feb., 1995. Oomen, A. et al, "A Variable-Bit Rate Buried-Data Channel for Compact Disc," Journal of the Audio Engineering Society vol. 43, No. 1-2, pp. 23-28, Jan.-Feb., 1995. Bender, Techniques for Data Hiding, Proc. SPIE, vo. 2420, Feb. 9, 1995, pp. 164-173. Bender et al., "Techniques for Data Hiding," Massachusetts Institute of Technology, Media Laboratory, Draft Preprint, Apr. 13, 1995, 10 pages. Quisquater, J., "Access Control and Copyright Protection for Images, Conditional Access and Copyright Protection Based on the Use of Trusted Third Parties," 1995, 43 pages. Proudler, Graeme J., "Authentication and Display of Signatures on Electronic Documents," 2244 Research Disclosure, Feb., 1994, No. 358, Emsworth, GB, 1 page. Franz et al., "Computer Based Steganography: How It Works and Why Therefore Any Restrictions on Cryptography are Nonsense, at Best," Information Hiding, First Int. Workshop Proc, May 30-Jun. 1, 1996, pp. 7-21, (a counterpart was published in German by Steffen Moller et al in 1994). Tirkel et al., "Image Watermarking-A Spread Spectrum Application," Proc. IEEE, ISSSTA '96, Mainz, Germany, Sep. 22-25, 1996, vol. II, pp. 785-789. Cha et al., "A Solution to the On-Line Image Downgrading Problem," Proc. 11thAnnual computer Secruity Applications Conf., Dec. 11, 1995, pp. 108-112. Braudaway et al., "Protecting Publicly-Available Images with a Visible Image Watermark," SPIE vol. 2659, Feb. 1, 1996, pp. 126-133. Bruckstein, A.M.; Richardson, T