Traitement d'image Cheminée Industrielle

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Hello,
if anyone can help me on this subject
I'm at engineering school and I'm working on a project where we have to determine the condition of an industrial chimney (presence of rust/cracks). To do this, we capture the chimney and then process the image to determine whether the section photographed has any defects. I tried a first code with different tools:
-Contour detection with Canny Edge
-Segmentation using Thresholding
-Morphological analysis
I didn't have much success, as some of the photos show welds, but it only detects welds and not cracks.
I've started looking into CNNs but I don't know if it's necessary.
I enclose a photo of the chimney
Thanks in advance