| 摘要 |
PURPOSE:To accurately measure the shape of even a body to be measured which has large light reflectivity by irradiating the body to be measured with one radiation light beam and then another irradiation light beam so that the body are not irradiated with both at the same time, and picking up projection images in synchronism with the respective irradiation light beams. CONSTITUTION:One of two light sources B and C, e.g. B is turned on to irradiate the body A to be measured with radiation light. The light from the light source B is transmitted through and diffused by a diffusion plate F to reach the body A to be measured. At this time, the shade corresponding to the body A to be measured is picked up by a television camera D. Then, the other light source B is turned off and another light source C is turned on. Light from the light source C is also diffused by the diffusion plate F as well to reach the body A to be measured and its shade is picked up by a television camera E. Those picked-up projection images are converted into binarization signals and processed in an image processing computer to measure the shape of the object body A. Thus, errors in measurement due to reflected light from the object body A are eliminated.
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