Improve the tesseract output from an old newspapers

[Claudi Ruiz]

Goal: Improve as much as possible the tesseract output.

Difficulties: different character sizes and poor image content quality.

Already done: binarize, dilate and erode.

Do you have any idea how to improve my output? Thank you in advance.

P.S. I have already checked: https://code.google.com/p/tesseract-ocr/wiki/ImproveQuality

[Claudi Ruiz]

How can I improve detection for the title specifically?

[Art Rhyno.]

You could try leveraging the coordinates for the words (available in the hocr output) or the letters themselves (via the API) and doing different processing for the title based on the size of the letters. Difference of Gaussians or another type of filter could thin the letters out, and you could also try tesseract in single character mode if you can isolate each letter. The bane of ocr for old newspapers tends to be multi-columned printing, in which case a separate segmentation tool, like olena, can be invaluable, but your sample does not suggest that columns are a factor.

 

art

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[Claudi Ruiz]

Thank you very much Art Rhyno. Sounds good I will try it, let's see if it works better.

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