Cleaning up captcha image

Question

I\'m trying to clean up the image above I\'ve tried several different methods using open cv, I either erode the original image too much to the point where parts of the

Answer 1

This is not a very robust solution but it might be help full in most of the cases:

By seeing the image sample posted above i can observe one common feature about the diagonal lines that they either start or end at the image edges while the text which we are interested in are in the middle so in this way we can determine the pixel values of those diagonal lines by searching them in the first and last few rows and columns of the image matrix and eliminate them as noise. And this approach also might be less time costly.