| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a printed matter containing hidden information which can hide make information in the printed matter and from which a receiver of the printed matter can acquire the hidden information, and a processing device of the hidden information. <P>SOLUTION: The image of the printed matter X having the information printed with transparent ink, in addition to ordinary ink, is picked up by a CCD camera 10. Then high-frequency components of the image picked up are removed by a high-frequency component removing means 20 and a hidden image constituted only of low-frequency components is held in a hidden image holding means 30. A hidden image recognizing means 40 judges whether the hidden image has some meaning, and displays the hidden image in an image display means 50 when the image has no meaning, while a hidden information processing means executes a processing corresponding to the meaning when the image has some meaning. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
