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In order to accurately detect the defects on the aluminum surface, including pinholes, yellow discoloration, oil stains, and scratches, an algorithm combining local fuzzy enhancement, wavelet transform modulus maxima (WTMM) and multi-scale product was proposed. First, the defect areas with low contrast, such as yellow discoloration and oil stains, were located in the HSI color space; then, the local fuzzy enhancement was performed on these edges, thereby highlighting the edge features and reducing the amount of computation; at last, the multi-scale product was calculated, and the binary image of defect edge on aluminum foil was obtained via WTMM. Plenty of experimental results showed that the proposed algorithm could extract clearer and more complete edges and effectively detect the defect edges with low contrast in the aluminum foil image, laying the foundation for the subsequent defect identification.

Detection of Defect Edge of Aluminum Foils Based on Fuzzy Enhancement and Wavelet Transform