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Remove all background and show only words for OCR

So I am currently working on OCR with tesseract-ocr, the problem it does not recognize the words with a green background. So I need to do pre-processing by making the background completely white and leaving "only" the black words for tesseract OCR. I would like to know how to do that for the image and if there are other pre-processing techniques I can use to raise the accuracy. Thanks.