| 摘要 |
Main image information (101) representing a portrait face image of a person is prepared. Predetermined pattern image information (102), used as sub image information, is also prepared. Synthetic image information (103) is prepared by synthesizing the main image information (101) with the pattern image information (102) in such a manner that the pattern image information (102) is embedded in the main image information (101) in a state that is not recognizable to the eye of a human being. This synthetic image information (103) is recorded on an ID card (105) or the like as a visible image. <IMAGE> |
