H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 9/32 (2006.01) G06T 1/00 (2006.01) G11B 20/00 (2006.01) H04N 5/91 (2006.01) H04N 5/913 (2006.01) H04N 7/08 (2006.01) H04L 12/64 (2006.01) H04N 9/79 (2006.01) H04N 9/804 (2006.01)
Patent
CA 2288366
To enhance the concealment characteristics of additional information transmitted, as electronic watermark information, together with an information signal and to surely and accurately transmit the additional information. A PN code string generated by a PN generation section 4 is superimposed such that a block in which the PN code string is superimposed on a video signal recorded on a DVD 100 and that in which the PN code string is not superimposed thereon by a pattern switching section 5 based on an attribute pattern from a superimposition pattern generation section 7 and the additional information on the video signal recorded on the DVD 100 is transmitted by the superimposition/non-superimposition pattern of this PN code string. To superimpose a plurality of additional information on an information signal and to surely provide the information signal to the other side using electronic watermark information, and to allow the side supplied with the information signal to surely and accurately detect each of the plurality of additional information superimposed on the information signal. Duplication control information is superimposed on a video signal so as to generate blocks in which a PN code string PS1 from the first PN generation section 4 is superimposed on the video signal and blocks in which the string PS1 is not superimposed thereon by the first pattern switching section 8 based on pattern information from a duplication control information pattern generation section 6, and transmitted by this superimposition/non- superimposition pattern. Further additional information is superimposed so as to generate blocks in.which a PN code string PS2 from the second PN generation section is superimposed on the video signal and blocks in which the string PS2 is not superimposed thereon by the second pattern switching section 9 based on pattern information from further additional information pattern generation section 7, and transmitted in such a manner that one-bit information is expressed depending on the superimposition/non-superimposition of the PN code string PS2 in each block.
Ikeda Nozomu
Kimura Yuji
Kohashi Takashi
Moriwaki Hisayoshi
Ogino Akira
Gowling Lafleur Henderson Llp
Sony Corporation
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