| 摘要 |
PROBLEM TO BE SOLVED: To provide a photographing method and photographing device of a cylindrical body inner wall surface capable of preventing distortion from being developed in photographed images and shortening time for photographing. SOLUTION: For a triangle pole mirror 20, two side faces 21 and 22 are mirror surfaces and an angleαformed by the side faces 21 and 22 with the side face 23 is 45 deg.. Also, an angle between the normal line of the side faces 21 and 22 and the center axis 50 of a cylinder 10 is 45 deg.. Thus, the optical distance of a camera 30 and a photographing part through the side faces 21 and 22 is equal, regardless of the photographing part of the inner wall surface 11. Thus, the distortion is prevented from being developed in the photographing images. Further, since the two side faces 21 and 22 of the triangle pole mirror 20 are the mirror surfaces, by rotating the cylinder 10 for 180 deg. and simultaneously photographing light projected to the side faces 21 and 22 by the camera 30, the entire periphery of the inner wall surface 11 is photographed. Thus, the photographing time of the inner wall surface 11 is made shorter than before.
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