curve identification in grayscale

Dear specialists,
I am trying to identify some curves in an image. Could anyone give me some hints? As you can see in the image, there are many white and black lines. how can I identify them?
I have tried houghline but the results were not adequate.
Thank you very much.

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Question posée :

le 5 Fév 2015

Modifié(e) :

le 5 Fév 2015

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