As the tesseract document said, the mini font size which can be recognized is 9 px. and the best dpi is 300 pixel. so before the ocr recognizing, i always scale the image to 1.5 times as original to make sure the font is big enough to read. and i made a free online tool to extract text from image : http://www.online-code.net/ocr.html, you can find it's higher accurate than normal tesseract ocr results.
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