公开(公告)号：GB2371435A

公开(公告)日：2002-07-24

申请号：GB0209059

申请日：1999-02-26

Applicant: IBM

Inventor： SHIMIZU SHUICHI ,  KOIDE AKIO

IPC: G06T1/00 ,  H04N7/24 ,  H04N7/26

Abstract: A method of detecting an electronic motion picture watermark using statistical observation of frames comprising the steps of, accumulating values through observation of frames, comparing the accumulated values with a threshold value, using the comparison to detect embedded information. The values obtained through observation may be normalised and the normalised values accumulated. A method of embedding data is also disclosed wherein the information is prepared for embedding as a bit stream, the sign of the bit stream being changed in accordance with a sign inversion cycle.

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.

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.

公开(公告)号：DE69319823T2

公开(公告)日：1999-03-25

申请号：DE69319823

申请日：1993-09-23

Applicant: IBM

Inventor： NUMAO MASAYUKI ,  MASUDA HIROSHI ,  SHIMIZU SHUICHI

IPC: G06F17/50 ,  G06T15/00 ,  G06T17/10

Abstract: A method and apparatus for constructing three-dimensional solid models from two-dimensional projections (orthographic views) is provided. An image processing unit prepares a cell decomposition model from three orthographic view data, a link of individual cells C1, C2, C3, C4,... in the prepared cell decomposition model is detailed referring to lines E1, ... represented on the three orthographic views, and a solid model is constructed according to a non-conflicting cell combination.

公开(公告)号：DE69739969D1

公开(公告)日：2010-10-07

申请号：DE69739969

申请日：1997-02-13

Applicant: IBM

Inventor： SHIMIZU SHUICHI ,  MORIMOTO NORISHIGE ,  KOBAYASHI MEI ,  NUMAO MASAYUKI

IPC: H04N1/387 ,  G06T1/00 ,  G09C5/00 ,  H04N1/32 ,  H04N1/44

公开(公告)号：DE69719922T2

公开(公告)日：2003-12-04

申请号：DE69719922

申请日：1997-11-14

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.

公开(公告)号：DE69719922D1

公开(公告)日：2003-04-24

申请号：DE69719922

申请日：1997-11-14

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.

公开(公告)号：CA2222346C

公开(公告)日：2002-07-09

申请号：CA2222346

申请日：1997-11-27

Applicant: IBM

Inventor： NUMAO MASAYUKI ,  MORIMOTO NORISHIGE ,  SHIMIZU SHUICHI

IPC: H04N5/225 ,  G06T1/00 ,  H04N1/32 ,  H04N1/387 ,  H04N7/167 ,  H04N7/18 ,  H04N21/4405 ,  H04N21/4623 ,  H04N21/83 ,  H04L9/32 ,  H04N5/335

Abstract: The invention provides a digital camera which embeds authentication informat ion for detecting the identity of a photographed image into the image. By supplying the authentication information integrally with image data, the verifier is enabl ed to verify the image data without saving the authentication information. By converting the light inputted through an optical system 21 to an electric signal, a CCD 22 outputs an anal og signal of an image. A signal processor 23 generates a digital signal of the image is r esponse to the analog signal. A digital camera has: a region dividing unit 24 for dividing the image into a first image region and a second image region in response to the digital si gnal; authentication information generator 29 for generating authentication inform ation from data in the first image region; encryptor 30 for encrypting the authentication in formation; hiding means 25 for embedding the encrypted authentication information into the sec ond image region by operating the data in the second image region; and region combinin g means 26 for combining the first image region in the image with the second image regi on in which the authentication information is embedded.

公开(公告)号：CZ20010721A3

公开(公告)日：2002-05-15

申请号：CZ20010721

申请日：1998-11-25

Applicant: IBM

Inventor： KAMIJO KOICHI ,  SHIMIZU SHUICHI ,  MORIMOTO NORISHIGE

IPC: G06T1/00 ,  H04N7/24 ,  H04N7/26 ,  H04N7/08 ,  G09C5/00

CPC classification number: G06T1/0035 ,  G06T2201/0052 ,  G06T2201/0053 ,  H04N7/24 ,  H04N19/467 ,  H04N21/23892 ,  H04N21/8358

公开(公告)号：GB2335816A

公开(公告)日：1999-09-29

申请号：GB9904340

申请日：1999-02-26

Applicant: IBM

Inventor： SHIMIZU SHUICHI ,  KOIDE AKIO

IPC: G06T1/00 ,  H04N7/26 ,  H04N1/32

Abstract: The invention provides an electronic watermark method and system for which the detection reliability of embedded information does not depend on the strength of signals that are measured in frames. Information is prepared for embedding as a bit stream, the sign of the bit stream being changed in accordance with a sign inversion cycle, and the bit stream being embedded in a frame. As for detection of information, values obtained through observation of frames are accumulated, and the accumulated values are compared with threshold values that are varied in accordance with the accumulated values obtained by observation. The comparison results are then employed to detect the embedded information.