| 摘要 |
<P>PROBLEM TO BE SOLVED: To display encoded information without spoiling display of an image a user originally desires to display. <P>SOLUTION: A specific image including encoded information is projected and displayed, by projection light which cannot be recognized by visual observation by human being, on a projection screen on which an image is projected and displayed. <P>COPYRIGHT: (C)2010,JPO&INPIT |
