| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a marker and the like that improve accuracy in calculating the length or area of a measurement object place.SOLUTION: A marker 1 includes four pointers 3, 5, 7, and 9. The four pointers 3, 5, 7, and 9 are situated at apexes of a tetrahedron, and relative positional relation with each other can also be learned by the pointers other than itself. Specifically, in an X-axis, a Y-axis, and a Z-axis in a three dimensional space, the pointer 3 is situated at (0, 0, 0) being coordinates of an origin 0, the pointer 5 is situated at (X1, Y1, Z1), the pointer 7 is situated at (X2, Y2, 0), and the pointer 9 is situated at (X3, Y3, 0). The pointers 3, 7, and 9 are arranged so as to be situated on the same XY plane.</p> |
