| 摘要 |
A method for generating a part of a position code comprises coding positions in the x-direction by a difference number sequence, which has the property that each partial sequence of predetermined length has an unambiguously determined place in the difference number sequence and coding positions in the y-direction by a difference number sequence, which has the property that each partial sequence of predetermined length has an unambiguously determined place in the difference number sequence. The difference number sequence of the x-direction is created by a first cyclic main number sequence, which is arranged in columns orthogonal to the x direction, with different circular shifts. The difference number sequence of the y-direction is created by a second cyclic main number sequence which is arranged in rows orthogonal to the y-direction, with different circular shifts. |
