A method of processing radiographic image data for detecting a defect of welding.

摘要

A radiographic test for a welded portion of a pipe provides an image of the welded portion including a weld defect image. It is introduced into a computer, noises are removed, a region of inspection is sampled, and the welding line portion is extracted (2, 3). The defect image is emphasized. An extraction process implements an automatic judgement of the defects. Based on statistic values pixels at the end of the welding line and the peripheral portion of defect emphasized image are modified to be consistent with the result of detection by the inspector. The knowledge of an inspector about irrelevant indications is formed as a database. Feature values of defects are compared with the database, for removing irrelevant indications. Feature values of images formed as one knowledge base (A, B, C), and the knowledge of an inspector formed into another knowledge base (D, E) are formed into certain rules, the image of a welded object is collated with these rules and the type of defect is inferred.