Fig. 2. Sample image of surface defect of silicon steel strip under oil pollution interference. (a) The original surface defect image of silicon steel strip under oil pollution interference. (b) The edge extraction image of original defect image.(c) The region image of clutter background interference. (d) The edge extraction image for figure (c). (e) The region image of oil pollution interference. (f) The edge extraction image for figure (e). (g) A region image of reflective pseudo-defect. (h) The edge extraction image for figure (g). (i) Another region image of reflective pseudo-defect. (j) The edge extraction image for figure (i).