I am having problem to detect scratch on these images. Actually, it is very easy to see by human eyes. However, when applying some algorithms, there are a lot of noise and I couldn't extract the scratch only.
Here are links for these images:
http://s21.postimg.org/uc7xu848n/scratch.png http://s14.postimg.org/nr7ois341/scratch _2.png2.
At present, I tried some kinds of filter (smoothing, average, median, Gaussian filter or Sobel edge detector) to erase noise and detect scratch but they don't help much. Could you suggest some idea? Some tools or algorithms that I should consider?
Scratches are large slashes.
