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Research project captcha

Hi all,

I'm currently doing a research project on OpenCV and captcha decoding for my it department of the University. Since I'm a beginner with opencv I can't get a fully clear image with just the letters of enclosed captcha image. I've already tried to apply a treshold, some denoising and a few blur options but can't get it clear.

Anybody who can help me out?
image description

Research project captcha

Hi all,

I'm currently doing a research project on OpenCV and captcha decoding for my it department of the University. Since I'm a beginner with opencv I can't get a fully clear image with just the letters of enclosed captcha image. I've already tried to apply a treshold, some denoising and a few blur options but can't get it clear.

Anybody who can help me out?
image description