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

抄録

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. Because the X-ray radiographic testing method is useful in inspecting the inside of weld metal, it is often used in industries. However, skilled inspectors for X-ray radiographic testing are gradually decreasing, recently several methods to detect weld defects from films automatically have been investigated. But, a X-ray film involves a number of noise, and defect images show very low contrast and various shape in spite of the same kinds of defect. Moreover, when unevenness on the surface of bead is large, detection of an internal defect image is difficult with the previous technique which depends on only a two-dimensional film image. Therefore, in this study, the new image processing system was constructed. Shadows by the surface unevenness in the X-ray film is removed using the range image of the bead surface on this system. 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 defined 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.