| 摘要 |
<P>PROBLEM TO BE SOLVED: To flexibly change a logical position of a network, even if network terminal location is changed. <P>SOLUTION: An image signal 160, from a two-dimensional image sensor 16c, is captured over a plurality of frames and it is decided whether luminance modulated information is acquired from these frames. When the luminance modulated information is acquired, the information is decoded into terminal specific information, stored in a data buffer memory 18 corresponding to a coordinate value and is collated with coordinate values and terminal specific information which are stored in a position information table memory 19. If the same specific information is stored in both the memories, the information is not updated; whereas when both the information items are different, the specific information stored in the data buffer memory 18 is rewritten as specific information that corresponds to the coordinate value in the position information table memory 19. <P>COPYRIGHT: (C)2009,JPO&INPIT |
