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Surface inspection of steel products is very important in terms of quality assurance. Recently, automation of inline surface inspections, especially of sheet products, has increased as a result of many kinds of development.1–3) For example, in continuous galvanizing lines and continuous annealing lines, automatic detection of defects has been realized by polarization optics, and surface quality has been assured by shipping products with the detected defect parts marked. Twin-illumination and Subtraction Technique for Detection of Concave and Convex Defects on Steel Pipes in Hot Condition