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Any chance to improve this captcha?

That's "B", but OCR1~OCR3 didn't recognize.
How to teach OCR this is a "B", not "8".


  • SvenSven
    Thats not as easy as you might think. You can only improve that by filters or use the Mask feature. What type of captcha is that?
  • @SvenAny books or reference about the detail of these filter works? how program calculate them?
  • SvenSven
    I tried to name the filters the way they work. Just search online to get details on what they do or simply try them out ;)
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