| 摘要 |
An image of a pipe having a uniform cross section, e.g., a circular cross section, is imaged with an endoscope and is displayed on a monitor screen. A measuring coordinate system for determining a three-dimensional position on a surface of the pipe from a position in the image is calculated by using information which relates to a position in the image and a corresponding actual position on the pipe surface, and which consists of extracted image information on the displayed image, e.g., information on the position of a cross-sectional figure and the position of a vanishing point, and known information on the size of the pipe and an imaging optical system.
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