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Metal Defect Detection

Hi Guys,

I am trying to develop a machine vision project about cartridge inspection. I need some help about defect detection techniques. This is one of sample images: image description

I try to find cardridge area with adaptive threshold. I extracted the inner of cartridge using adaptive threshold.

image description

My questions about defect detection techniques

  • The surface have a texture, but small points aren't defect. Do you have a good idea to find defects on surface?

  • Should I dissect the cartridge ROI or is there any good method inspect whole cartridge ROI at once?