| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain technique capable of associating corrected and written information with information before correction of a medium in real time without using a tablet and also to precisely detect coordinates on the medium. SOLUTION: A pen type coordinates input device 4 detects a position where a point part 5 is located on a medium. That is, an image reader 6 optically reads a code symbol which is formed on the medium and shows coordinates on the medium. A microcomputer 8 decodes the read code symbol. A detecting means (8) detects the position, direction and distortion quantity of a code symbol in an image read by the reader 6. The coordinates at the position of the part 5 on the medium are detected according to information after decoding by the microcomputer 8 and the position, direction and distortion quantity of the code symbol detected by the detecting means (8).</p> |
