To provide a method and an apparatus for inspecting a crack developing on flange parts which are made to be two-storied flange part protruded on a box body composed of synthetic resin.
Illuminating means 1 irradiates, from the lateral of a box body 5, the under face of an upper flange part 5a and the top face of a lower flange part 5b, which are made to be two-storied flange protruding parts on the four side faces of the box body 5. A CCD camera 2 images top faces of the upper flange part 5a and the lower flange part 5b obliquely from above the box body 5. Image processing means 3 processes the binarization of the image taken by the CCD camera 2 and derive a binary-valued image of the top faces of the upper flange part 5a and the lower flange part 5b. Further, determining means 4 determines the presence of a crack from the binary-valued image. Hereat, in the binary-valued image by the image processing means 3, since the top face of the upper flange part 5a appears as a black area, while a crack developing on the upper flange part 5a appears as a white area, and soil adhering to the top face of the upper flange part 5a does not emerge in the binary- valued image; the determining means 4 does not mistake soil for a crack.
TOMIOKA TETSUYA
MIYAHARA TERUO
ASAHI BREWERIES LTD
ASAHI BEER ENG TOKYO KK
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