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How to improve defects detection on surface with unequal contrast?

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Hello everybody, I am new in image processing...
I am working on a MV project and I have to find all the anomalies on the images that look familiar as this one:
As you can see from picture, contrast of anomalies (defects) is not so good. I have to improve contrast of them so that the thresholding after will be easy. Any suggestions how can I do that?

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