| 摘要 |
PROBLEM TO BE SOLVED: To enable a highly precise displacement measurement to be acquired. SOLUTION: A compensation method is applied, when collimating an excavating cross section 18 with time at the same measuring point X through a digital camera 12 to acquire the picked-up image data and determining an interior space displacement with time of the excavating cross section 18 by operation based on a plurality of the acquired picked-up image data. Based on rotation angle θ in a horizontal in-plane, elevation angle ϕ in a perpendicular in-plane, and optical-axis rotation angle γ when installing the digital camera 12 at the measuring point X, the picked-up image data is compensated and a displacement is calculated by using the picked-up image data after compensation. Three standard points 201 , 202 , 203 are imaged into the picked-up image data, of which the absolute position-coordinate values are known, and the compensation of the displacement is determined by solving simultaneous equations from the image processing data of these three standard points. |
