Composite Battery Film Defect Detection

Non-destructive defect inspection software for mobile phone battery surfaces, where surface quality has been inspected manually. After tilt correction, feature-region extraction and character gray-value adjustment, an adaptive-threshold method based on gray-density distribution and gray difference traverses the feature regions as sub-images, merging overlapping defect sub-images and filtering out regions without obvious defects. A multi-class support vector machine then identifies the surface defect types, trained on the pixel-distribution patterns of the binary images.