| 摘要 |
PROBLEM TO BE SOLVED: To provide illumination applying light to the inner surface of a cylindrical article from a plurality of directions, obtaining stable brightness, even if a surface for imaging the cylindrical article is a glossy surface, such as a surface of metal, and obtaining a captured image for improving precision of an image inspection. SOLUTION: In the illumination method for brightly irradiating the cylindrical article 3 with a light, when inspecting an image obtained by imaging the cylindrical article 3 that uses an imaging means, namely, a camera 6 for imaging, light is applied in the imaging direction from the outside of the cylindrical article 3 from a plurality of light sources 2 that are disposed between the imaging means 6 and the cylindrical article 3, in parallel with an imaging direction 10 for imaging the cylindrical article. COPYRIGHT: (C)2011,JPO&INPIT
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