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    DATA HIDING METHOD USING STATISTICAL VERIFICATION AND DATA EXRACTION METHOD
    11.
    发明专利
    DATA HIDING METHOD USING STATISTICAL VERIFICATION AND DATA EXRACTION METHOD 失效

    公开(公告)号：JPH10240129A

    公开(公告)日：1998-09-11

    申请号：JP24799897

    申请日：1997-09-12

    Applicant: IBM JAPAN

    Inventor： KOIDE AKIO ,  MORIMOTO NORISHIGE ,  SHIMIZU SHUICHI ,  KOBAYASHI SEISHI

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

    Abstract: PROBLEM TO BE SOLVED: To suppress the degradation in picture quality or the like of media information subjected to padding processing by properly certifying who is a true owner and adaptively determining the manipulated variable for characteristic values such as picture element values. SOLUTION: In a data hiding method which pads media data with message data, a key having a prescribed value is taken as input of a specific function to obtain a secondary key. Based on this obtained secondary key, the padding position of message data is specified, and a function for padding to be used in this specified position out of plural functions for padding is specified. The padding processing of message data is performed in the specified position based on the specified function for padding.

    DATA HIDING METHOD AND DATA EXTRACT METHOD
    12.
    发明专利
    DATA HIDING METHOD AND DATA EXTRACT METHOD 失效

    公开(公告)号：JPH10164349A

    公开(公告)日：1998-06-19

    申请号：JP31610596

    申请日：1996-11-27

    Applicant: IBM JAPAN

    Inventor： NINOMIYA SHOICHI ,  MORIMOTO NORISHIGE ,  TEZUKA TSUDOI

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

    Abstract: PROBLEM TO BE SOLVED: To provide high durability against elimination or change of hidden message information by hiding medium information into message information in a frequency space and to keep hidden message information effectively even when signal processing using a frequency filter is executed. SOLUTION: In order to hide message information (m) in medium information M, these information are frequency-converted to obtain those frequency spectra f1 , f2 . Then an area including a characteristic frequency component denoting a characteristic of the message information (m) in a real space is extracted from the frequency spectrum f2 of the message information (m) as a basic area B. Regarding the basic area B, n-sets of copies are generated and n-sets of the copies are arranged dispersedly in the frequency space and the other frequency components are set to zero to generate a frequency spectrum f3 as intermediate information. Finally the frequency spectrum f3 and the frequency spectrum f1 are added and the result is frequency-converted inversely to hide the message information (m) into the medium information M.

    DATA HIDING METHOD OF MOVING PICTURE AND DATA EXTRACT METHOD
    13.
    发明专利
    DATA HIDING METHOD OF MOVING PICTURE AND DATA EXTRACT METHOD 失效

    公开(公告)号：JP2001292428A

    公开(公告)日：2001-10-19

    申请号：JP2001049098

    申请日：2001-02-23

    Applicant: IBM

    Inventor： MAEDA JUNJI ,  MORIMOTO NORISHIGE

    IPC: G06F12/14 ,  G06F21/24 ,  H04N7/08 ,  H04N7/081

    Abstract: PROBLEM TO BE SOLVED: To imbed attached information in a moving picture without deteriorating the image quality and losing a compression efficiency. SOLUTION: This invention relates a data hiding method that imbeds information in a moving picture consisting of frames. Macro blocks to which the information is imbedded are specified. Imbedding rules are defined where contents of imbedded data are cross-referenced with an inter-frame prediction type of the macro blocks. The rules define that a 2-way prediction is adopted for a prediction type in the case of imbedding, e.g. '1', and forward or backward prediction is adopted when '0' is imbedded. The prediction type of macro blocks specified for an object of imbed processing is forcibly decided according to the data going to be imbedded according to the rules. In the case of extraction, extraction rules in reverse relation to the imbed rules are defined, and the imbedded bits are extracted on the basis of the prediction type of the specified macro blocks as the object of extraction processing by referencing the extraction rules.

    CONTENTS DATA EVALUATING DEVICE
    14.
    发明专利
    CONTENTS DATA EVALUATING DEVICE 失效

    公开(公告)号：JP2001036856A

    公开(公告)日：2001-02-09

    申请号：JP17609499

    申请日：1999-06-22

    Applicant: IBM

    Inventor： TOYOKAWA KAZUHARU ,  MORIMOTO NORISHIGE ,  TONEGAWA SATOKO

    IPC: H04N5/91 ,  G06F7/04 ,  G06F21/10 ,  G06K9/00 ,  G06T1/00 ,  H04L9/32 ,  H04N1/387 ,  H04N7/167

    Abstract: PROBLEM TO BE SOLVED: To accurately judge which part of contents data are altered since the time of preparing them by providing a means for sampling data for specifying contents and a means for judging the presence/absence of the alteration of the contents data based on this sampling result. SOLUTION: A picture alteration judging device compress-encodes a picture photographed by a digital camera 140 by a JPEG system, e.g. to accept via a camera IF 104. Otherwise, the device accepts compressed picture data recorded in a memory card 142 by the camera 140 through a memory card IF106. At the time of accepting the compressed picture data, an electronic watermark (embedded data) is embedded to the compressed picture data. Then, through the use of using the character of JPEG data obtained by embedding the embedded data, a sampling part judges and displays whether the JPEG data are altered or not and when it is altered, the part decides and displays which part of the picture data are altered.

    FALSIFICATION DISCRIMINATION DEVICE AND ITS METHOD
    15.
    发明专利
    FALSIFICATION DISCRIMINATION DEVICE AND ITS METHOD 失效

    公开(公告)号：JP2000358148A

    公开(公告)日：2000-12-26

    申请号：JP15835899

    申请日：1999-06-04

    Applicant: IBM

    Inventor： TONEGAWA SATOKO ,  MORIMOTO NORISHIGE ,  KAMIJO KOICHI

    IPC: H04N1/387 ,  G06K9/00 ,  G06T1/00

    Abstract: PROBLEM TO BE SOLVED: To discriminate to which part of an image is falsified by imbedding an electronic watermark to the image. SOLUTION: An imbedding section 30 selects DCT coefficients corresponding to each other from respective DCT blocks of a luminance component Y of an image two each of them formed in pairs and included in each pair by using a random number and processes the DCT coefficients so that the correlation between them represents data according to prescribed rules and imbeds the data to the image. When this image is falsified, the DCT coefficients included in the pairs of the falsified part bend the rules so as to represent a different value from that of the original data. An extract section 40 extracts the data from the image, estimates the data imbedded at first through majority decision and discriminates that the pairs with the data different from the estimated data extracted from them receive falsification and displays the discriminated result.

    METHOD AND SYSTEM FOR BURYING ADDITIONAL INFORMATION IN AUDIO DATA
    16.
    发明专利
    METHOD AND SYSTEM FOR BURYING ADDITIONAL INFORMATION IN AUDIO DATA 失效

    公开(公告)号：JP2000172282A

    公开(公告)日：2000-06-23

    申请号：JP26924499

    申请日：1999-09-22

    Applicant: IBM

    Inventor： KOBAYASHI SEISHI ,  CHIN TEIEN ,  OSHIMA YOSHIAKI ,  SHIMIZU SHUICHI ,  MORIMOTO NORISHIGE

    IPC: G09C5/00 ,  G10K15/02 ,  G10L11/00 ,  G10L19/00 ,  G10L21/04 ,  G11B15/05 ,  G11B19/04 ,  G11B20/00 ,  G11B20/10 ,  G11B27/036 ,  H04H20/00 ,  H04H20/31 ,  H04N1/32

    Abstract: PROBLEM TO BE SOLVED: To detect reliably the processing to the audio data while burying so as not to detect a change of tone quality due to burying of additional information with human auditory sense by burying the additional information in a changeable range of a frequency that the audio data are buried. SOLUTION: A frequency conversion block 120 calculates a frequency component of an audio signal. An auditory sense psychology model calculation block 130 calculates an area hard to differentiate the change based on a characteristic of a human ear. An additional information burying mask generation block 170 generates a mask used when the additional information is buried. An additional information burying block 140 buries the inaudible additional information in the audio signal. That is, the block 140 adds a signal/time companding/ detecting synchronizing signal to the frequency converted audio signal in the mask direction in an inaudible range based on the calculated auditory sense model. A frequency inverse conversion block 190 inversely converts the frequency converted audio signal.

    POWER UNIT
    17.
    发明专利
    POWER UNIT 失效

    公开(公告)号：JPH0491579A

    公开(公告)日：1992-03-25

    申请号：JP20527390

    申请日：1990-08-03

    Applicant: IBM

    Inventor： KOBAYASHI MASAKI ,  MORI MASAKI ,  MORIMOTO NORISHIGE

    IPC: H04N5/63 ,  G09G1/00 ,  G09G1/04 ,  G09G1/16 ,  H02M3/28 ,  H02M3/335 ,  H04N3/185

    Abstract: PURPOSE: To improve the efficiency of a power unit and reduce the size of the unit by constituting a switching regulator by using a plurality of horizontal synchronizing pulse trains having different frequencies so that the regulator can work in a plurality of display modes. CONSTITUTION: A horizontal synchronizing pulse train having a selected frequency is supplied to a waveform shaping circuit 2 through a line 11. An automatic frequency control circuit AFC3 incorporates an oscillation circuit 3A and a synchronizing circuit 3B and, since the saw tooth wave generated from the circuit 3A is corrected to a saw tooth wave having a frequency which is a multiple times as high as that of the horizontal synchronizing pulse train impressed upon the circuit 3B, the circuit 3B becomes synchronous to the frequency of the horizontal synchronizing pulse impressed upon the circuit 3B by generating a feedback signal on a line 13A. The power control circuit 8 of a switching regulator type power source circuit 9 receives a pulse from a line 16 and a feedback signal from a line 17 and generates a switching pulse on a line 18. Therefore, a power unit can operate at a frequency which is several times as high as a plurality of horizontal synchronizing frequencies and, moreover, synchronously and the principal design parameters can be selected so that the optimum operating condition can be obtained.

    DIGITAL DATA AUTHENTICATION SYSTEM
    20.
    发明专利
    DIGITAL DATA AUTHENTICATION SYSTEM 失效

    公开(公告)号：JP2000196589A

    公开(公告)日：2000-07-14

    申请号：JP37235598

    申请日：1998-12-28

    Applicant: IBM

    Inventor： KAMIJO KOICHI ,  MORIMOTO NORISHIGE ,  KOIDE AKIO ,  SAKAKURA TORU

    IPC: G09C1/00 ,  G06F12/14 ,  G06F21/24 ,  G06K17/00 ,  G06T1/00 ,  H04L9/32 ,  H04N1/00 ,  H04N1/21 ,  H04N1/32

    Abstract: PROBLEM TO BE SOLVED: To provide a digital data authentication system which can prevent data, although having no secrecy themselves, from being altered or passed off owing to improvement or replacement and give security to the data. SOLUTION: Equipment authentication between an input device and a memory device and between the memory device and a receiver is carried out when digital data is written from the input device 100 to the memory device 200 and transferred from the memory device 200 to the receiver 300. At the same time, when the digital data is written to the memory device 200, the digital data is given an electric signature by an unidirectional hash function and when the digital data read out of the memory device 200 and transferred, the given electric signature is decoded and then transferred after it is confirmed that the digital data is not modified after being recorded. Consequently, the data are prevented from being altered or passed off owing to improvement or replacement although the data themselves have no secrecy, so that the data can be given security.

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