距離画像とX線画像の融合による内部欠陥像の検出(第1報) : 階調計を利用した距離画像とX線画像のマッチング法

概要

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In this study, construction of an automatic inspection system of X-ray film is tried. Films used in this study are acquired by X-ray inspection of welded joints. Becausc the X-ray radiographic testing method is useful in inspecting the inside of weld metal, it is often used in industries. Howevcr, skilled inspectors for X-ray radiographic testing arc gradually decreasing, rcccntly several mcthods to deicct weld dcfects from films automatically have been investigatcd. But, a X-ray film involves a number of noise, and defect images show very low contrast and various shapc in spitc of the same kinds of defect. Moreover, when uncvenness on the surface of bead is large, detection of an intcrnal defect image is difficult with the previous technique which depcnds on only a two-dimcnsional film image. Thcreforc, in this study, the new imagc processing system was constructed. Shadows by the surface uncvcnness in the X-ray film is removed using the range image of the bead surface on this systcm. That is to say, first of all, the range image is matched to X-ray image about resolution, intensity and location. Then, the transferred image is dcfined as the background image and subtracted from the X-ray image. In this process, matching method between range image and X-ray image is important. In this study, the matching method using contrast indicator was constructed.
公益社団法人精密工学会の論文
2000-02-05