公开(公告)号：WO9749235A8

公开(公告)日：2001-07-26

申请号：PCT/JP9700395

申请日：1997-02-13

Applicant: IBM JAPAN ,  IBM

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

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

CPC classification number: H04N1/32203 ,  G06T1/0021 ,  G06T2201/0051 ,  G06T2201/0061 ,  G09C5/00 ,  H04N1/32208 ,  H04N1/32251 ,  H04N1/32309 ,  H04N21/23892 ,  H04N21/8358 ,  H04N2201/3233 ,  H04N2201/327

Abstract: A data hiding method for hiding message data in media data and a data extracting method for extracting message data hidden in the media data. In the data hiding method, the message data are dispersedly hidden in the media data so that no third person can alter the message data. Specifically, the array elements of a message array are dispersedly hidden in a media array based on a status value S designating a specific array element in the media array when the media data and message data are expressed as the media array and the message array, respectively. The hiding method includes (a) a step of determining the j-th (j>/=0) status value Sj, (b) a step of determining the (j+1)-th status value Sj+1 based on the value Sj, the array element of the media array designated by the value Sj and the above-mentioned array element of the message array, and (c) a step of hiding data to be hidden in the array element of the media array designated by the value Sj+1.

Abstract translation: 用于在媒体数据中隐藏消息数据的数据隐藏方法和用于提取隐藏在媒体数据中的消息数据的数据提取方法。 在数据隐藏方法中，消息数据被分散地隐藏在媒体数据中，使得没有第三人可以改变消息数据。 具体地说，当媒体数据和消息数据被分别表示为媒体数组和消息数组时，消息数组的数组元素基于指定媒体阵列中的特定数组元素的状态值S而被分散地隐藏在媒体数组中 。 隐藏方法包括（a）确定第j（j> / = 0）状态值Sj的步骤，（b）基于该值确定第（j + 1）状态值Sj + 1的步骤 Sj，由值Sj指定的媒体阵列的数组元素和消息数组的上述数组元素，以及（c）隐藏要由值指定的媒体阵列的数组元素中隐藏的数据的步骤 SJ + 1。

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.

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.

公开(公告)号：JPH10164549A

公开(公告)日：1998-06-19

申请号：JP31752696

申请日：1996-11-28

Applicant: IBM JAPAN

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

Abstract: PROBLEM TO BE SOLVED: To provide a new system capable of supplying authentication information in a form which is inseparable from an image data. SOLUTION: An image is halved and authentication information to hide in one image is obtained from the other image itself. Objective image data photographed by a digital camera is divided into an area D1 for generating a hush value and an area D2 for hiding a hush value H. A digest-calculating part calculates H from data of D1 and ciphers it by a secret key different for each digital camera, etc., to hide D2 , hiding can be executed by operating a pixel value in a real space or a frequency space to a degree of not being recognized visually. In D2 , additional information such as a time stamp, positional information of GPS can be hidden before hiding data from D1 .