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.