| 摘要 |
<P>PROBLEM TO BE SOLVED: To identify an instructed position on a medium even if there is a gap between the instructed position on the medium and a position found by photographing a printed image. <P>SOLUTION: A position detection device includes; an image reading part 21 which reads out images; a dot sequence generation part 22 which detects dots from the images to generate a dot sequence; a block detection part 23 which detects blocks from the dot sequence to generate a code sequence; a synchronous code detection part 24 which detects synchronous codes from the code sequence; an identification code detection part 30 which detects identification codes on the basis of the synchronous code; an identification code decoding part 32 which decodes the identification codes to obtain identification information; an X-coordinate code detecting part 40 and a Y-coordinate code detecting part 45 which detect coordinates codes on the basis of the synchronous codes; an X-coordinate code decoding part 42 and a Y-coordinate code decoding part 47 which decode the coordinates codes to obtain coordinates information; and a coordinates correcting part 50 which converts the relative coordinates of the tip of a pen on a photographed image to those on a medium to find the coordinates of the tip of the pen on the medium in addition to its coordinates information. <P>COPYRIGHT: (C)2009,JPO&INPIT |
