| 摘要 |
A plate 5 provided with a square lattice-work pattern thereupon is provided in the same space with two cameras 1 and 2 and a theodolite 4. This plate-unlike known plates, which have been around 4 meters by 3 meters in size and consequently so great as to make precise drawing of the square lattice-work pattern difficult, resulting in calibration with low precision-is about 1.5 meters by 1 meter in size, for example. As the plate is small, a precise square lattice-work pattern can be drawn thereupon. The theodolite 4 measures 3-dimensional coordinates for at least two set positions of the plate 5. Then, calibration is performed using the image data obtained by the two cameras 1 and 2 imaging the square lattice-work pattern and the 3-dimensional coordinates measured with the theodolite.
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