title: OCR on antialiased text
body: <p>I have to OCR table from PDF document. I wrote simple Python+opencv script to get individual cells. After that new problem arose. Text is antialiased and not good-quality. 
  Recognition rate of tesseract is very low. I've tried to preprocess images with adaptive thresholding but results weren't much better.
  I've tried trial version of ABBYY FineReader and indeed it gives fine output, but I don't want to use non-free software.
  I wonder if some preprocessing would solve issue or is it nessesary to write and learn other OCR system.</p>
  
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