Remove all background and show only words for OCR

asked 2015-10-02 08:25:28 -0600

fredreload
28 ●2 ●5

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.

edit retag flag offensive close merge delete

add a comment

1 answer

Sort by » oldest newest most voted

answered 2015-10-02 09:03:15 -0600

David_86
86 ●2 ●5

If your letters are always black and it's the background changing colour you can convert the image into gray-scale and perform a binary threshold. You'll turn white everything above the threshold level.