公开(公告)号：GB2363027B

公开(公告)日：2004-04-28

申请号：GB0109188

申请日：2001-04-12

Applicant: IBM

Inventor： TANIGUCHI MASAAKI ,  SHIMIZU SHUHICHI ,  KAMIJOH KOHICHI

IPC: G06T1/00 ,  G09C5/00 ,  H04N1/32 ,  H04N1/387 ,  H04N7/08 ,  H04N7/081

公开(公告)号：GB2363027A

公开(公告)日：2001-12-05

申请号：GB0109188

申请日：2001-04-12

Applicant: IBM

Inventor： TANIGUCHI MASAAKI ,  SHIMIZU SHUHICHI ,  KAMIJOH KOHICHI

IPC: G06T1/00 ,  G09C5/00 ,  H04N1/32 ,  H04N1/387 ,  H04N7/08 ,  H04N7/081

Abstract: A data processing apparatus for selecting a watermark to be embedded generates, for each of a plurality of possible watermarks, a variation indication indicating the variation between object data and the object data with the embedded watermark and a detectability indicator indicating how easily the watermark may be detected. One of the plurality of watermarks is then selected based on the two indicators and is embedded. Preferably the selected watermark gives high detectability and low variation. The watermark may comprise additional information data relating to separate blocks of an image.

公开(公告)号：JP2001313810A

公开(公告)日：2001-11-09

申请号：JP2000111674

申请日：2000-04-13

Applicant: IBM

Inventor： TANIGUCHI MASAAKI ,  SHIMIZU SHUICHI ,  KAMIJO KOICHI

IPC: G06T1/00 ,  G09C5/00 ,  H04N1/32 ,  H04N1/387 ,  H04N7/08 ,  H04N7/081

Abstract: PROBLEM TO BE SOLVED: To apply imbedding processing to image data or the like by adaptively optimizing imbedding data, denoting attached information such as copyright information depending on contents of the data which is an imbedding object. SOLUTION: An image division section 200 divides image data Vi into image blocks Iij and corresponds them to selection basic patterns Phij. Orthogonal conversion sections 24, 202 generate DFT coefficients I'ij, P'hij, and power component calculation section 208, 264 generate power components I"ij, P"ij. A basic pattern adjustment section 26 adjusts the coefficients P'hij to generate P'hij1-P'hijn. An imbedding pattern generating section 28 calculates a change before and after the P'hij1-P'hijn are imbedded to the I"ij, selects P'''hij1-P'''hij1 which give a change of a threshold εor bower from the P'hij1-P'hijn and selects one imbedding pattern P'ij which is detected most easily. A pattern imbedding section 204 adds the P'ij to the I'ij and imbeds the sum.

公开(公告)号：JP2004336529A

公开(公告)日：2004-11-25

申请号：JP2003131500

申请日：2003-05-09

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： OSADA SEIJI ,  TANIGUCHI MASAAKI ,  KAMIJO KOICHI

IPC: H04N19/50 ,  G06T1/00 ,  H04N5/913 ,  H04N7/08 ,  H04N7/081 ,  H04N19/157 ,  H04N19/40 ,  H04N19/467 ,  H04N19/48 ,  H04N19/51 ,  H04N19/513 ,  H04N19/60 ,  H04N19/625 ,  H04N19/70 ,  H04N19/91 ,  H04N7/30 ,  H04N7/32

CPC classification number: G06T1/0085 ,  G06T2201/0051 ,  G06T2201/0052 ,  G06T2201/0053 ,  G06T2201/0061 ,  H04N19/42 ,  H04N19/467 ,  H04N19/51 ,  H04N19/61 ,  H04N2005/91335

Abstract: PROBLEM TO BE SOLVED: To embed reversible visible watermarks in compressed motion pictures. SOLUTION: There are provided a reversible quantization/dequantization operator 10 for deqauntizing motion picture data subjected to information compression containing frequency conversion and quantization, and a watermark embedding/eliminating operator 30 for generating and embedding visible electronic watermark patterns corresponding to motion-compensated prediction in the motion picture data that have been dequantized by the quantization/dequantization operation part 10. The quantization/dequantization operator 10 quantizes the motion picture data in which the electronic watermarks have been embedded by the watermark embedding/eliminating operation part 30. COPYRIGHT: (C)2005,JPO&NCIPI

公开(公告)号：JP2002111994A

公开(公告)日：2002-04-12

申请号：JP2000276129

申请日：2000-09-12

Applicant: IBM

Inventor： TANIGUCHI MASAAKI ,  SHIMIZU SHUICHI ,  KAMIJO KOICHI ,  SUGIHARA AKIRA

IPC: G06T1/00 ,  G09C5/00 ,  H04N1/387 ,  H04N7/08 ,  H04N7/081

Abstract: PROBLEM TO BE SOLVED: To provide a digital watermark embedding/detecting method and system not demanding a signal for geometric correction. SOLUTION: A periodic pattern having repetition is used for an embedding pattern itself having information for embedding as digital watermarking, and a change in the period is observed at the time of detection, thereby calculating an enlargement and reduction rate. At the time of detection of digital watermarking, the enlargement and reduction rate of a screen image is acquired from digital data which is performed an enlargement and reduction, and next a detection processing of the digital watermarking is carried out based on the obtained enlargement and reduction rate.