WARP IMAGE CREATION APPARATUS, SECRET INFORMATION CONCEALMENT IMAGE CREATION APPARATUS, WARP IMAGE CREATION METHOD, SECRET INFORMATION CONCEALMENT IMAGE CREATION METHOD, WARP IMAGE CREATION PROGRAM, SECRET INFORMATION CONCEALMENT IMAGE CREATING PROGRAM

摘要

PROBLEM TO BE SOLVED: To prevent the occurrence of a ghost phenomenon of a secret information concealment image used in a steganography technology, moreover, to create a warp image or the secret information concealment image which is difficult to presume concealed information based on the secret information concealment image. SOLUTION: A warp image creation method has steps of: intermediate characteristic part information creation processing which corresponds to first characteristic part information partly defining a characteristic composition of the cover image and respective parts of the characteristic composition, and creates intermediate characteristic part information which is the intermediate characteristic information of the first characteristic part information and second characteristic part information based on the second characteristic part information partly defining a characteristic composition different from the characteristic composition according to a morphing ratio showing a composition ratio of the cover image and the image with the second characteristic part information; and warp image creation processing which converts the cover image, and creates the warp image so that the characteristic part information of the converted image and intermediate characteristic information become equal. COPYRIGHT: (C)2009,JPO&INPIT