No.3（2008）5.X-ray Inspection of Foreign Bodies in Foods

Norihiro Ohira, Zhou Hongjun, Kazumi Sakamaki, Kunio Kamimuura, Hideaki Shimizu, Hideo Saiki

X-ray inspection system of foreign bodies in foods has become is necessary for our society in recent years, with the expectation that they could inspect not only metals but also other bodies like glass, rubber, nylon, etc. Calculation algorithms for X-ray inspection of foreign bodies in foods have been reported. In food inspection systems, it is important that inspection is high precision, with high speed that is as fast as conveyor belts.

Using Statistical methods, we construct a higher precision method than usual methods. We focused on Kittler’s minimum error thresholding. In the usual Kittler's method, order n-squared calculations are required for distributed calculation, so it is not suitable for high speed food inspection. We find that using approximations of variances in Kittler’s method is not too critical for practical use. Using it, we be come able to inspect for foreign bodies that were not able to be inspected for so far.

Keywords

detecting foreign bodies, high precision, statistical methods, thresholding

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