Title:
【発明の名称】データ・ハイディング方法及びデータ抽出方法
Document Type and Number:
Japanese Patent JP3251594
Kind Code:
B2
Abstract:
To provide a data hiding method of hiding media data in message data and a data extraction method of extracting the hidden data wherein message data is dispersively hidden in media data such as an image or sound to prevent a third person from modifying the message data easily. A data hiding method in which media data is expressed as a media array while message data is expressed as a message array so that the array elements of the message array can be dispersively hidden in the message array based on a state values specifying a particular array element of the media array, comprises the steps of: (a) determining the j-th (j ≥ 0) state value Sj; (b) determining (j + 1)-th state value Sj+1 based on the j-th state value, the array element of the media array indicated by the j-th state value, and the array element of the message array; and (c) hiding data with respect to the array element of the media array indicated by the (j + 1)-th state value Sj+1.
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Inventors:
Masayuki Numao
Shuichi Shimizu
Morimoto Norishige
Kobayashi Mei
Shuichi Shimizu
Morimoto Norishige
Kobayashi Mei
Application Number:
JP50265598A
Publication Date:
January 28, 2002
Filing Date:
February 13, 1997
Export Citation:
Assignee:
IBM Japan, Ltd.
International Classes:
G06T1/00; G09C5/00; H04N1/32; H04N1/44; (IPC1-7): H04N1/387; G06T1/00
Other References:
【文献】Marc Schneider and Shih-Fu Chang,”A ROBUST CONTENT BASED DIGITAL SIGNATURE FOR IMAGE AUTHENTICATION”,IEEE International Conference on Image Processing,Lausanne,Switzerland,Sept.1996
Attorney, Agent or Firm:
Hiroshi Sakaguchi (1 person outside)
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