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    Method and system for embedding information in document
    61.
    发明专利
    Method and system for embedding information in document 未知

    公开(公告)号：GB2344666B

    公开(公告)日：2003-04-02

    申请号：GB9921762

    申请日：1999-09-16

    Applicant: IBM

    Inventor： HIRAYAMA YUKI ,  AMANO TOMIO ,  SHIMIZU SHUHICHI ,  MORIMOTO NORISHIGE

    IPC: G06F12/14 ,  G06F17/21 ,  G06F21/24 ,  G06T1/00 ,  G06T11/60 ,  G06F1/00

    Abstract: A method and a system for embedding information in document data that include text written in a page description language. First, an analysis is made of the layout of the document data in which information is to be embedded. Then, based on the analysis of the layout, a sequence of locations is generated whereat the information is to be embedded. A page description of the text at a determined location is changed in accordance with the embedded information. As a result, the information is embedded in document data that include text written in a page description language. The sequence of locations is generated by producing a string of sequential pseudo-random numbers.

    DATA ENCODING SYSTEM
    62.
    发明专利
    DATA ENCODING SYSTEM 未知

    公开(公告)号：PL183593B1

    公开(公告)日：2002-06-28

    申请号：PL34941397

    申请日：1997-02-13

    Applicant: IBM

    Inventor： MORIMOTO NORISHIGE ,  MAEDA JUNJI

    IPC: H04N7/08 ,  G06T1/00 ,  H04N7/00 ,  H04N7/081 ,  H04N7/16 ,  H03M13/25 ,  H04N1/44

    Abstract: An objective of the present invention is to provide a method for embedding additional information into a video movie without substantially having an influence on the compression efficiency of the video movie and also without substantially causing degradation of the picture quality. ÄCONSTITUTIONÜ Specify at least one embedding region in the frame of the video movie for embedding information, and determine a type of interframe prediction of the embedding region in correspondence with information to be embedded by referring to an embedding rule where a content of data to be embedded is caused to correspond to the type of interframe prediction of the embedding region. It is desirable that the frame in which the embedding region exists is a bidirectionally predictive-coded frame.

    DATA HIDING AND EXTRACTION METHODS
    63.
    发明专利
    DATA HIDING AND EXTRACTION METHODS 未知

    公开(公告)号：CA2264625C

    公开(公告)日：2002-04-02

    申请号：CA2264625

    申请日：1997-02-13

    Applicant: IBM

    Inventor： MAEDA JUNJI ,  MORIMOTO NORISHIGE

    IPC: H04N7/08 ,  G06T1/00 ,  H04N7/00 ,  H04N7/081 ,  H04N7/16 ,  H04N5/76 ,  G11B23/00

    Abstract: An objective of the present invention is to provide a method for embedding additional information into a video movie without substantially having an influence on the compression efficiency of the video movie and also without substantially causing degradation of the picture quality. Specify at least one embedding region in the frame of the video movie for embedding information, and determine a type of interframe prediction of the embedding region in correspondence with information to be embedded by referring to an embedding rule where a content of data to be embedded is caused to correspond to the type of interframe prediction of the embedding region. It is desirable that the frame in which the embedding region exists is a bidirectionally predictive-coded frame.

    SYSTEM FOR EMBEDDING ADDITIONAL INFORMATION IN VIDEO DATA, AND EMBEDDING METHOD
    64.
    发明专利
    SYSTEM FOR EMBEDDING ADDITIONAL INFORMATION IN VIDEO DATA, AND EMBEDDING METHOD 未知

    公开(公告)号：PL346276A1

    公开(公告)日：2002-01-28

    申请号：PL34627698

    申请日：1998-11-25

    Applicant: IBM

    Inventor： KAMIJO KOICHI ,  SHIMIZU SHUICHI ,  MORIMOTO NORISHIGE

    IPC: G06T1/00 ,  H04N7/24 ,  H04N7/26 ,  H04N7/08

    Abstract: It is one object of the present invention to provide a method and system for embedding an electronic watermark directly in an MPEG stream. ÄConstitutionÜ An intra-macroblock of an I-frame or of a P or B-frame is detected in an MPEG stream, and following the detection of an intra-macroblock of the I-frame or of the P or B-frame, data for one macroblock are extracted from the MPEG stream and buffered. An embedding pattern is embedded in the buffered macroblock without changing the length of VLC, and the resultant macroblock is returned to the MPEG stream. More specifically, a DC factor is extracted from the buffered macroblock, and a pseudorandom number is generated to produce an embedding pattern. Then, whether the bit length of the DC factor will not be changed by embedding the obtained embedded pattern is determined. When the bit length of the DC factor not be changed, the embedding pattern is embedded in the buffered macroblock. When the bit length will be changed, whether 1/2 of the embedding pattern can be embedded is determined. If possible, 1/2 of the embedded pattern is embedded in the macroblock.

    A system for embedding authentication information into an image and an image alteration detecting system
    66.
    发明专利
    A system for embedding authentication information into an image and an image alteration detecting system 未知

    公开(公告)号：SG78279A1

    公开(公告)日：2001-02-20

    申请号：SG1997003922

    申请日：1997-10-31

    Applicant: IBM

    Inventor： SHIMIZU SHUICHI ,  NUMAO MASAYUKI ,  MORIMOTO NORISHIGE

    IPC: H04N5/225 ,  G06T1/00 ,  H04N1/32 ,  H04N1/387 ,  H04N7/167 ,  H04N7/18 ,  H04N21/4405 ,  H04N21/4623 ,  H04N21/83 ,  G06T11/00

    Abstract: A digital camera has means to authentication information into a photographed image for detecting the identity of the image. The authentication information supplied integrally with the image data, so that, the verifier can verify the image data without saving the authentication information. This is achieved by having a region dividing unit 24 for dividing the image into a first image region and a second image region in response to the digital signal, authentication information generating means 29 for generating authentication information from data in the first image region, encrypting means 30 for encrypting the authentication information, hiding means 25 for embedding the encrypted authentication information into the second image region by operating the data in the second image region, and region combining means 26 for combining the first image region in the image with the second image region in which the authentication information is embedded.

    DATA HIDING METHOD, DATE EXTRACTING METHOD AND SYSTEM
    67.
    发明专利
    DATA HIDING METHOD, DATE EXTRACTING METHOD AND SYSTEM 未知

    公开(公告)号：HK1015904A1

    公开(公告)日：1999-10-22

    申请号：HK99100759

    申请日：1999-02-24

    Applicant: IBM

    Inventor： MORIMOTO NORISHIGE ,  TEZUKA SHU ,  NIMOMIYA SYOITI

    IPC: G06F12/14 ,  G06F21/24 ,  G06T1/00 ,  G09C5/00 ,  H04N1/32 ,  H04N1/387 ,  H04N7/08 ,  H04N7/081 ,  G06F

    Abstract: In order to hide message information (m) in media information (M), the frequency transform of the message information (m) and the media information (M) are performed, and frequency spectra f1 and f2 are obtained. Next, from the frequency spectrum f2 of the message information (m), a region containing feature frequency components representative of the features of the message information (m) in real space is extracted as the base region B. Then, n copies of the base region B are generated, and in frequency space, the n copies are dispersedly arranged. Also, by making the frequency components other than that equal to zero, a frequency spectrum f3 is generated as intermediate information. Finally, the frequency spectrum f3 and the frequency spectrum f1 are added, and by performing the inverse frequency transform of the result, the message information (m) can be hidden in the media information (M).

    70.
    发明专利
    未知

    公开(公告)号：DE69738502D1

    公开(公告)日：2008-03-20

    申请号：DE69738502

    申请日：1997-02-13

    Applicant: IBM

    Inventor： MORIMOTO NORISHIGE ,  MAEDA JUNJI

    IPC: H04N7/08 ,  G06T1/00 ,  G11B20/00 ,  H04N7/00 ,  H04N7/081 ,  H04N7/16

    Abstract: An objective of the present invention is to provide a method for embedding additional information into a video movie without substantially having an influence on the compression efficiency of the video movie and also without substantially causing degradation of the picture quality. ÄCONSTITUTIONÜ Specify at least one embedding region in the frame of the video movie for embedding information, and determine a type of interframe prediction of the embedding region in correspondence with information to be embedded by referring to an embedding rule where a content of data to be embedded is caused to correspond to the type of interframe prediction of the embedding region. It is desirable that the frame in which the embedding region exists is a bidirectionally predictive-coded frame.

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